NOISE CANCELLATION TECHNOLOGIES INC
S-3, 1997-12-29
MISCELLANEOUS ELECTRICAL MACHINERY, EQUIPMENT & SUPPLIES
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   As filed with the Securities and Exchange Commission on December 29, 1997
                                                 Registration No. 333-______
- -------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                      ---------------------------------------------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                      ---------------------------------------------
                      NOISE CANCELLATION TECHNOLOGIES, INC.
             (Exact name of Registrant as specified in its charter)
      Delaware                                             59-2501025
(State or Other Jurisdiction of                            (I.R.S. Employer
Incorporation or Organization)                             Identification No.)
        1025 West Nursery Road, Linthicum, Maryland 21090 (410) 636-8700
   (Address, Including Zip Code, and Telephone Number, Including Area Code,
                  of Registrant's Principal Executive Offices)
                  --------------------------------------------
                              JOHN B. HORTON, Esq.
              Senior Vice President, General Counsel and Secretary
                      Noise Cancellation Technologies, Inc.
                                 One Dock Street
                           Stamford, Connecticut 06902
                          (203) 961-0500, Extension 388
                (Name, Address, Including Zip Code, and Telephone
               Number, Including Area Code, of Agent For Service)
                  Copies of all communications and notices to:
                            WILLIAM P. O'NEILL, Esq.
                                CROWELL & MORING
                         1001 Pennsylvania Avenue, N.W.
                           Washington, D.C. 20004-2595
                                      (202) 624-2500
                      ---------------------------------------------
     Approximate  date of  commencement  of proposed sale to the public:
     From  time to  time  after  the  effective  date  of  this  Registration
     Statement.

If the only  securities  being  registered  on this form are  being  offered 
pursuant  to dividend or interest reinvestment plans, please check the 
following box.     |_|

If any of the  securities  being  registered on this form are to be offered on a
delayed or continuous  basis  pursuant to Rule 415 under the  Securities  Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box: |X|

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the  Securities  Act,  check the following box and list the
Securities  Act  registration   statement   number  of  the  earlier   effective
registration statement for the same offering. |_| __________

If this Form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. |_| __________

If delivery of the  prospectus  is  expected  to be made  pursuant to Rule 434,
check the following box.     |_|  __________
                         CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
                                    Proposed       Proposed
Title of Shares   Amount to be      Maximum         Maximum        Amount of
to be Registered  Registered(1)    Aggregate       Aggregate     Registration
                                     Price         Offering         Fee(1)
                                  Per Unit (2)     Price (2)
- --------------------------------------------------------------------------------
  Common Stock     33,273,393       $1.0625       $35,352,980     $10,429.13
                     shares
- -------------------------------------------------------------------------------
(1)Pursuant  to Rule 429,  promulgated  under  the  Securities  Act of 1933,  as
   amended, 11,708,971 shares of registrant's Common Stock initially included in
   registrant's registration statements (File Nos. 33-19926, 33-38584, 33-44790,
   33-47611, 33-51468, 33-7442, 33-84694 and 333-10545) that remain unsold as of
   the date hereof are being carried forward in this registration statement. The
   fees  associated  with such shares of Common Stock that were  previously paid
   with such earlier registration statement aggregated $8,293.82.
(2)Estimated  solely for the purpose of calculating  the  registration  fee 
   pursuant to Rule 457(c)  promulgated  under the Securities Act of 1933, 
   based on the average of the high and low prices for the Common Stock on the 
   NASDAQ National Market System on December 19, 1997.
- -------------------------------------------------------------------------------
The Registrant hereby amends this  registration  statement on such date or dates
as may be necessary to delay its effective date until the registrant  shall file
a further amendment which specifically  states that this registration  statement
shall  thereafter  become  effective  in  accordance  with  Section  8(a) of the
Securities  Act of  1933  or  until  the  registration  statement  shall  become
effective on such date as the Commission,  acting pursuant to said Section 8(a),
may determine.



<PAGE>


INFORMATION   CONTAINED  HEREIN  IS  SUBJECT  TO  COMPLETION  OR  AMENDMENT.   A
REGISTRATION  STATEMENT  RELATING  TO THESE  SECURITIES  HAS BEEN FILED WITH THE
SECURITIES  AND EXCHANGE  COMMISSION.  THESE  SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION  STATEMENT  BECOMES
EFFECTIVE.  THIS  PROSPECTUS  SHALL  NOT  CONSTITUTE  AN  OFFER  TO  SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE  SECURITIES
IN ANY STATE IN WHICH SUCH OFFER,  SOLICITATION  OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.





<PAGE>


             SUBJECT TO COMPLETION, DATED DECEMBER 29, 1997

                               PROSPECTUS

                           45,361,257 SHARES

                 NOISE CANCELLATION TECHNOLOGIES, INC.

                              COMMON STOCK
                              ------------
   This  offering   consists  of  378,894   shares  of  Common  Stock  of  Noise
Cancellation  Technologies,  Inc.  (the  "Company")  which are issuable upon the
exercise of outstanding  warrants and options to purchase shares of Common Stock
by persons not deemed "affiliates" of the Company, as that term is defined under
the Securities Act of 1933 (the "Securities Act").

   This  offering  also  consists of the resale of  26,000,000  shares of Common
Stock which may be issued upon the conversion of issued and  outstanding  shares
of the  Company's  Series C  Convertible  Preferred  Stock by persons not deemed
"affiliates" of the Company, as that term is defined under the Securities Act.

   In addition,  this  offering  consists of the resale of  6,857,143  shares of
Common Stock which were issued by the Company in private  placements exempt from
registration  under  the  Securities  Act and were  issued  and  outstanding  on
December  19, 1997,  as well as the resale of  4,092,555  shares of Common Stock
which may be issued upon the  exercise of  outstanding  warrants  and options to
purchase shares of Common Stock to persons who may be deemed "affiliates" of the
Company and the resale of 8,032,665 shares of Common Stock to persons not deemed
"affiliates" of the Company, as that term is defined under the Securities Act.

   All of the  foregoing  shares of Common  Stock may be offered for sale by the
holders thereof (the "Selling  Stockholders").  The Company will not receive any
of the proceeds  from the sale of such shares  although the Company will receive
the aggregate  proceeds  from the exercise,  from time to time, of the foregoing
warrants and options to purchase shares of Common Stock (see "Use of Proceeds").

   SEE "RISK FACTORS" ON PAGES 15 THROUGH 32 FOR CERTAIN INFORMATION
                        RELATING TO THE COMPANY.

THESE  SECURITIES  HAVE NOT BEEN APPROVED OR  DISAPPROVED  BY THE SECURITIES AND
EXCHANGE  COMMISSION OR ANY STATE  SECURITIES  COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

   The  Company's  Common Stock is quoted on the NASDAQ  National  Market System
under the symbol  "NCTI".  The last sale price reported for such Common Stock on
December 19, 1997, as quoted by NASDAQ, was $1.0938.

            THE DATE OF THIS PROSPECTUS IS DECEMBER 29, 1997

<PAGE>


                           TABLE OF CONTENTS

                                                                  Page
Available Information.............................................   5
Incorporation of Certain Documents by Reference...................   6
The Company.......................................................   7
Summary Consolidated Financial Data...............................  11
Recent Developments...............................................  13
The Offering......................................................  14
Risk Factors......................................................  15
Use of Proceeds...................................................  33
Selling Stockholders..............................................  34
Plan of Distribution..............................................  38
Legal Matters.....................................................  39
Experts...........................................................  39



<PAGE>


                         AVAILABLE INFORMATION

   The Company is subject to certain of the  informational  requirements  of the
Securities  Exchange  Act of 1934,  as  amended  (the  "Exchange  Act"),  and in
accordance  therewith  files  periodic  reports and other  information  with the
Securities  and  Exchange  Commission  (the  "Commission").  Reports,  proxy and
information  statements  and  other  information  filed  by the  Company  can be
inspected  and  copied at the  public  reference  facilities  maintained  by the
Commission at 450 Fifth Street,  NW,  Washington,  DC 20549 and at the following
regional  offices of the Commission:  Seven World Trade Center,  Suite 1300, New
York, New York 10048 and Suite 1400,  Citicorp Center,  500 West Madison Street,
Chicago,  Illinois 60611.  Copies of such material can also be obtained from the
Public Reference Section of the Commission, 450 Fifth Street, NW, Washington, DC
20549 at prescribed  rates. The Company is an electronic filer on EDGAR pursuant
to Rules 100 and 101 of  Registration  S-T. The Commission  maintains a Web site
that contains  reports,  proxy and information  statements and other information
regarding registrants that file electronically with the Commission.
The address of such site is (http://www.sec.gov).

   The Company has filed with the  Commission  certain  Registration  Statements
under the Securities Act with respect to the  securities  being offered  hereby.
This  Prospectus  does  not  contain  all  the  information  set  forth  in  the
Registration  Statements,  certain parts of which are omitted in accordance with
the rules and regulations of the Commission. For further information,  reference
is hereby made to the Registration Statements.

                            ----------------


   NO DEALER,  SALESMAN,  OR ANY OTHER  PERSON HAS BEEN  AUTHORIZED  TO GIVE ANY
INFORMATION  OR TO MAKE ANY  REPRESENTATIONS  IN  CONNECTION  WITH THIS OFFERING
OTHER THAN THOSE  CONTAINED  IN THIS  PROSPECTUS,  AND,  IF GIVEN OR MADE,  SUCH
INFORMATION OR REPRESENTATION  MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY.  THIS  PROSPECTUS  DOES NOT  CONSTITUTE  AN OFFER TO SELL,  OR A
SOLICITATION  OF AN OFFER TO BUY, ANY SECURITIES  OTHER THAN THE COMMON STOCK TO
WHICH IT RELATES OR A SOLICITATION TO ANY PERSON IN ANY JURISDICTION  WHERE SUCH
AN OFFER OR  SOLICITATION  WOULD  BE  UNLAWFUL.  NEITHER  THE  DELIVERY  OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCE, CREATE ANY
IMPLICATION  THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE  COMPANY  SINCE
THE DATE HEREOF.




<PAGE>


            INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   The following  documents  have been filed by the Company with the  Commission
pursuant to the Exchange Act (File No. 0-18267) and are  incorporated  herein by
reference and made a part hereof:

(1)the  Company's  Annual  Report  on Form  10-K for the  year  ended
   December 31, 1996,  (including Amendment No. 1 thereto filed on April
   21, 1997, and Amendment No. 2 thereto filed on April 30, 1997);

(2)the Company's  Quarterly Reports on Form 10-Q for the quarterly periods ended
   March 31, 1997,  June 30, 1997, and September 30, 1997  (including  Amendment
   No. 1 thereto filed on November 17, 1997);

(3)the  Company's  Current  Reports  on Form 8-K  filed  on  January  27,  1997,
   February 7, 1997,  February  25,  1997,  March 25,  1997,  April 15, 1997 and
   November 17, 1997; and

(4)the   description  of  capital  stock  found  in  Item  1  of  the  Company's
   Registration  Statement on Form 8-A filed with the  Commission on January 30,
   1990.

   All documents  filed by the Company  pursuant to Section 13(a),  13(c), 14 or
15(d) of the Exchange Act  subsequent  to the date of filing of this  Prospectus
and prior to the termination of the offering of the Common Stock covered by this
Prospectus are deemed to be incorporated by reference and shall be a part hereof
from their respective dates of filing.

   Any statement contained in a document  incorporated by reference herein shall
be deemed to be modified or  superseded  for purposes of this  Prospectus to the
extent  that  a  statement   contained  in  this  Prospectus  or  in  any  other
subsequently  filed  document  which also is  incorporated  by reference  herein
modifies  or  supersedes  such  statement.  Any such  statement  so  modified or
superseded  shall  not be  deemed,  except  as so  modified  or  superseded,  to
constitute a part of this Prospectus.

   The Company will provide,  without  charge,  to each person to whom a copy of
this  Prospectus is delivered,  upon written or oral request,  a copy of any and
all of  the  information  that  has  been  incorporated  by  reference  in  this
Prospectus,  but not including exhibits to such information unless such exhibits
are  specifically  incorporated  by  reference  into the  information  that this
Prospectus  incorporates.  Requests  for  copies of such  information  should be
directed  to  Krystyna   Marushak,   Investor   Relations,   Noise  Cancellation
Technologies,  Inc., One Dock Street,  Stamford,  Connecticut  06902,  telephone
number (203) 961-0500, extension 391.



<PAGE>


                              THE COMPANY

   Noise Cancellation Technologies, Inc. ("NCT" or the "Company") believes it is
the  industry  leader in the  design,  development,  licensing,  production  and
distribution  of  electronic  systems  for Active  Wave  ManagementTM  including
systems that  electronically  reduce noise and vibration.  The Company's systems
are designed for integration into a wide range of products serving major markets
in  the  transportation,   manufacturing,   commercial,  consumer  products  and
communications  industries.  The Company has begun commercial application of its
technology,  with 16 product lines sold or currently  being sold,  including the
NoiseBuster(TM)  and  other  consumer  headsets,   ClearSpeech(TM)-Mic  ("CSM"),
adaptive    speech   filter    ("ASF(TM)"),    the    ProActive(TM)    line   of
industrial/commercial  active  noise  reduction  ("ANR")  headsets,  an aviation
headset for  pilots,  an  industrial  muffler or  "silencer"  for use with large
vacuums and blowers,  quieting  headsets  for patient use in magnetic  resonance
imaging ("MRI") machines, an aircraft cabin quieting system and quieting systems
for heating, ventilation and air conditioning ("HVAC") ducts ("NoiseEater(TM)").

   In keeping  with the  direction  established  in late 1994,  during  1997 the
Company  continued  the active  practice of  marketing  its  technology  through
licensing  to third  parties  for  up-front  fees  and,  in many  cases,  future
royalties.

   In 1997, the Company  introduced  additional  products for the communications
marketplace,  and additional  industrial headset products.  In 1998, the Company
plans to introduce further additional  products for the headset,  communications
and audio marketplaces.  The Company is also refining its NoiseEater(TM) product
for  introduction  into  international  markets.  The Company has entered into a
joint  venture  with  Applied  Acoustic  Research,  L.L.C.  ("AAR")  and  Hoover
Universal,  Inc. ("Hoover"), a wholly owned subsidiary of Johnson Controls, Inc.
("JCI"),  called OnActive Technologies,  L.L.C. ("OAT") which is developing Flat
Panel   Transducer(TM)   ("FPT(TM)")   systems   utilizing   Top  Down  Surround
Sound(TM)(TDSS(TM))  for automotive  applications.  The Company has also entered
into a cross license  agreement  with Verity Group plc ("Verity") and its wholly
owned subsidiary,  New Transducers,  Limited ("NXT"), for the cross licensing of
the parties' respective FPT(TM) technologies in various markets.

   In late 1995 the Company  redefined its corporate mission to be the worldwide
leader in the  advancement  and  commercialization  of Active Wave  ManagementTM
technology.  Active  Wave  ManagementTM  is  the  electronic  and/or  mechanical
manipulation of sound or signal waves to reduce noise,  improve  signal-to-noise
ratios and/or  enhance sound  quality.  This  redefinition  is the result of the
development of new technologies,  as previously noted, such as ASF(TM),  TDSSTM,
FPTTM, and the silicon micromachined  microphone ("SMM"),  which can be used for
products  that the  Company  believes  will be utilized  in areas  beyond  noise
attenuation and control. These technologies and products are consistent with the
shift of the  Company's  focus  to  technology  licensing  fees,  royalties  and
products that represent near term revenue generation.

   As  distribution  channels are  established  and as product  sales and market
acceptance  and  awareness  of  the  commercial   applications  of  Active  Wave
ManagementTM  build,  revenues from  technology  licensing  fees,  royalties and
product  sales  are  forecasted  to fund an  increasing  share of the  Company's
requirements.  The funding  from these  sources,  if  realized,  will reduce the
Company's dependence on engineering and development funding.

   Active Wave  ManagementTM  is an evolving  industry.  The  proportion  of the
Company's operating revenues,  including technology licensing fees, derived from
engineering  and  development  services,  is reflective  of this fact.  From the
Company's inception in April 1986, through September 30, 1997, approximately 22%
of its  operating  revenues  have come from the sale of products  and 31% of its
operating revenues have come from licensing of the Company's  technology,  while
approximately  47% of its  operating  revenues  have come from  engineering  and
development services.

   Active noise control offers many advantages over traditional  passive methods
of noise control such as  conventional  mufflers,  ear protectors and acoustical
padding.  Active noise control systems: (i) generally reduce only unwanted noise
and permit  desired  sounds such as the human voice,  music or warning  tones to
pass freely,  (ii) are more successful in attenuating low frequency noise, (iii)
contribute  to energy  savings and provide  other  economic  benefits in various
applications, and (iv) generally are smaller and lighter.

   Active Wave  ManagementTM  is the  utilization  of active  noise  attenuation
technology  and certain other  technologies  which results in the electronic and
mechanical  manipulation  of sound or  signal  waves to  reduce  noise,  improve
signal-to-noise ratio and/or enhance sound quality.

   NCT  believes  that it has the leading  position in Active Wave  ManagementTM
technology,  holding more patents and intellectual  property than any other firm
in the field. The Company also has an exclusive  license to advanced  technology
for attenuating  noise in a large space,  such as the interior of an aircraft or
the passenger compartment of an automobile,  using multiple interactive sensors,
such as microphones,  and actuators, such as speakers.  Additionally the Company
has expanded its portfolio by the acquisition of various patents.

   The Company has entered into a number of strategic supply,  manufacturing and
marketing   alliances  with  leading  global  companies  to  commercialize   its
technology. These strategic alliances historically have funded a majority of the
Company's  research and  development,  and  provided  the Company with  reliable
sources  of  components,  manufacturing  expertise  and  capacity,  as  well  as
extensive marketing and distribution capabilities. In exchange for this funding,
the other party  generally  received a preference  in the  distribution  of cash
and/or profits or royalties from these  alliances until such time as the support
funding,  plus an "interest"  factor in some  instances,  is recovered.  NCT has
established   continuing   relationships  with  Walker   Manufacturing   Company
("Walker")  (a  division of  Tennessee  Gas  Pipeline  Company,  a wholly  owned
subsidiary of Tenneco,  Inc.),  AB Electrolux  ("Electrolux"),  Foster  Electric
Company, Ltd. ("Foster"),  Analog Devices, Inc. ("ADI"),  Ultra Electronics Ltd.
("Ultra"),  The Charles  Stark  Draper  Laboratory,  Inc.  ("Draper"),  Coherent
Technologies,  Inc.  ("Coherent"),  AAR, Hoover, NXT, OKI Electric Industry Co.,
Ltd.  ("OKI") and Siemens AG  ("Siemens"),  among others,  in order to penetrate
major markets more rapidly and  efficiently,  while minimizing the Company's own
capital expenditures. There have been substantial changes to the terms governing
certain of the foregoing relationships as described below.

   In February 1995 the Company  purchased  from Foster the  exclusive  right to
manufacture  headsets in the Far East. Due to the  acquisition by the Company in
1994 of the sole ownership of Chaplin Patents Holding Co., Inc. ("CPH"), neither
the Company nor Foster believed there was any necessity to continue their supply
joint  venture,   Foster/NCT  Supply  Ltd.  ("FNS").   The  Company  and  Foster
accordingly  dissolved FNS. The Company and Foster remain active in the Far East
through the Foster/NCT  Headsets  International  ("FNH") and NCT Far East,  Inc.
("NCTFE")  marketing and distribution  alliances between the Company and Foster.
Foster continued to produce products for NCT in 1996 and 1997.

   In March 1995,  the Company and Ultra  amended  their  teaming  agreement and
concluded  a  licensing  and  royalty  agreement  for $2.6  million and a future
royalty  of 1 1/2% of sales  commencing  in 1998.  Under  the  agreement,  Ultra
acquired the Company's  active  aircraft  quieting  business based in Cambridge,
England,  leased a portion of the  Company's  Cambridge  facility  and  employed
certain of the Company's employees.

   On November  15,  1995,  the Company and Walker  executed a series of related
agreements (the "Restructuring  Agreements")  regarding the Company's commitment
to help fund $4.0  million of product and  technology  development  work and the
transfer of the  Company's  50% interest in WNCT (an equally  owned  partnership
between Walker and the Company) to Walker. The Restructuring Agreements provided
for the transfer of the Company's interest in WNCT to Walker, the elimination of
the Company's  previously expensed obligation to fund the remaining $2.4 million
of product and  technology  development  work, the transfer to Walker of certain
Company owned tangible  assets related to the business of WNCT, the expansion of
certain existing  technology  licenses and the Company's  performance of certain
research and development  activities for Walker at Walker's expense as to future
activities.

   An important factor for the Company's  continuing  development is its ability
to recruit and retain key  personnel.  As of September 30, 1997, the Company had
71 employees,  including 41 engineers  and related  technical  staff.  Among its
engineering staff and consultants are several  scientists and inventors that the
Company  believes are  preeminent in Active Wave  Management(TM)  and the active
noise and vibration control field worldwide.

   The Company was  incorporated  in Nevada on May 24, 1983. In April 1985,  the
Company  moved its  corporate  domicile to Florida and assumed its present name,
and in January 1987,  following the  assumption of control of the Company by the
present  management,  it changed its state of  incorporation  to  Delaware.  The
Company's principal executive offices, research and product development facility
are located at 1025 West Nursery  Road,  Linthicum,  Maryland  21090;  telephone
number (410)  636-8700.  NCT maintains  sales and marketing  offices at One Dock
Street, Suite 300, Stamford, Connecticut 06902; telephone number (203) 961-0500.
The Company's European  operations are conducted through its product development
and marketing  facility in Cambridge,  England.  NCT also  maintains a marketing
facility in Tokyo, Japan.


<PAGE>


                  SUMMARY CONSOLIDATED FINANCIAL DATA

   The following should be read in conjunction  with the consolidated  financial
statements of the Company and the notes thereto and "Management's Discussion and
Analysis of Financial  Condition  and Results of  Operations",  incorporated  by
reference  into this  Prospectus.  See  "Incorporation  of Certain  Documents by
Reference" Items (1) and (2).  Operating results for the nine month period ended
September 30, 1997,  are not  necessarily  indicative of the results that may be
expected  for the year  ending  December  31,  1997.  The  summary  consolidated
financial data set forth below does not reflect the Company's  private placement
of shares of its Series C Convertible Preferred Stock (the "Preferred Stock") or
its subsidiary's private placement of shares of the subsidiary's common stock or
the proceeds derived therefrom. See "Recent Developments" below.

<TABLE>
<CAPTION>
                                                   (In Thousands Except per Share Amounts)
                                                          Years Ended December 31,
                       ---------------------------------------------------------------------------------------------
                                   1992                 1993               1994               1995              1996
                       ---------------------------------------------------------------------------------------------
<S>                             <C>                  <C>                <C>                <C>              <C>  

STATEMENTS OF OPERATIONS DATA:
REVENUES
 Product sales                   $  740               $1,728             $2,337            $ 1,589            $1,379
 Engineering and                  3,779                3,598              4,335              2,297               547
  development services
 Technology licensing fees           62                   60                452              6,580             1,238
  and other
                                -------             --------            -------            -------           -------
      Total revenues             $4,581               $5,386             $7,124            $10,466            $3,164
                                -------             --------            -------            -------           -------
COSTS AND EXPENSES:
 Cost of sales                   $  608               $1,309             $4,073            $ 1,579            $1,586
 Cost of engineering              2,748                2,803              4,193              2,340               250
  and development services
 Selling, general and             5,151                7,231              9,281              5,416             4,890
  administrative
 Research and development         4,214                7,963              9,522              4,776             6,974
 Interest (income) expense, net    (169)                (311)              (580)               (49)               17
 Compensation expense-removal      7,442                  -- (1)             --                 --                --
  of vesting condition
 Equity in net (income) loss         117               3,582 (2)          1,824                (80)               80
  of unconsolidated affiliates
 Other expense, net                   89                  --                718                552               192
                                --------            --------           --------            -------          --------
     Total costs and expenses   $ 20,200            $ 22,577           $ 29,031            $14,534          $ 13,989
                                --------            --------           --------            -------          --------
 Net (loss)                     $(15,619)(1)        $(17,191)(2)       $(21,907)           $(4,068)         $(10,825)
                                ========            ========           ========            =======          ========
 Weighted average number of
  common shares outstanding(3)    61,712              70,416             82,906             87,921           101,191
                                ========            ========           ========            =======          ========
 Net (loss) per share           $  (0.25)(1)        $  (0.24)(2)       $  (0.26)           $ (0.05)         $  (0.11)
                                ========            ========           ========            =======          ========
</TABLE>
<PAGE>

                                              NINE MONTHS
                                          ENDED SEPTEMBER 30,
                                          ---------------------
                                            1996        1997
                                          ---------   ---------
             STATEMENTS OF OPERATIONS
             DATA:
             REVENUES
               Product sales              $  1,049       $  1,069
               Engineering and                 225            341
                development services
               Technology licensing fees     1,229          3,430
                and royalties           
                                          ---------      ---------
                       Total revenues       $2,503         $4,840
                                          ---------      ---------
             COSTS AND EXPENSES:
               Cost of sales                   850          1,401
               Cost of engineering and         175            295
                development services
               Selling, general and          4,105          3,734
                administrative
               Research and development      4,790          4,513
               Interest (income)                26             75
                expense, net
               Equity in net loss of            80             --
                unconsolidated affiliates
                                          ---------      ---------
                       Total costs and     $10,026        $10,018
                       expenses
                                          ---------      ---------
               Net (loss)                 $ (7,523)      $ (5,178)
                                          =========      =========
               Weighted average number
                of common shares      
                outstanding(3)              98,060        121,490
                                          =========      =========
               Net (loss) per common      $   (.08)      $   (.04)
                share
                                          =========      =========





<PAGE>

<TABLE>
<CAPTION>
                                                    December 31,                                            September 30,
                 -------------------------------------------------------------------------------------      -------------
                              1992             1993             1994             1995             1996          1997
                 -------------------------------------------------------------------------------------      -------------
<S>                        <C>             <C>              <C>               <C>              <C>           <C>

BALANCE SHEET DATA:
 Total assets              $15,771          $29,541          $12,371           $9,583           $5,881        $6,254
 Total liabilities           2,069            6,301            6,903            2,699            3,271         3,878
 
 Long-term debt                 --               --               --              105               --            --
 Accumulated deficit       (29,682)         (46,873)         (68,780)         (72,848)         (83,673)      (88,851)
 Stockholders equity(4)     13,702           23,239            5,468            6,884            2,610         2,376
 Working capital            11,038           19,990              923            1,734           (1,312)         (711)
  (deficiency)
</TABLE>

(1)Includes a one-time  non-cash  charge of $7,441,875 or $.12 per share for the
   year  ended  December  31,  1992,  related  to the  removal  of  the  vesting
   conditions to certain  warrants.  This charge  removed any  potential  future
   charge to earnings related to such warrants.

(2)In  connection  with  the  sale of  Common  Stock to  Tenneco  Automotive  in
   December  1993,  the Company  recognized  its share of cumulative  losses not
   previously  recorded with respect to its joint venture with Walker  amounting
   to $3,581,682.

(3)Does not include  shares  issuable  upon the  exercise of  outstanding  stock
   options and warrants, since their effect would be antidilutive.

(4) The Company has never declared nor paid cash dividends on its Common Stock.




<PAGE>


                          RECENT DEVELOPMENTS

   Between October 10, 1997 and December 4, 1997, the Company's subsidiary,  NCT
Audio  Products,  Inc. ("NCT Audio") issued 2,145 shares of its common stock for
an  aggregate  purchase  price of $4.0 million in the NCT Audio  Financing.  See
"Risk Factors - Current Financial Condition; Cash Position; Conditional Adequacy
of Currently Available Funds to Sustain Company" below.

   Between  October 28, 1997 and December 11, 1997, the Company entered into the
Subscription  Agreements  to sell an  aggregate  amount of $13.3  million of the
Company's  Preferred  Stock in the 1997 Preferred Stock Private  Placement.  See
"Risk Factors - Current Financial Condition; Cash Position; Conditional Adequacy
of Currently Available Funds to Sustain Company" below.  Subscription Agreements
totalling  $11.3  million  were  received  and  accepted by the Company  through
November 13, 1997. Of the total  Preferred  Stock  Offering,  sales of Preferred
Stock in the aggregate  amount of $6.1 million were completed as of November 13,
1997,  with the  balance of the sales in the  aggregate  amount of $7.2  million
scheduled to be completed  by November  18, 1997.  Such $7.2 million  balance of
sales was completed on December 11, 1997.




<PAGE>


                              THE OFFERING

   This offering consists of 378,894 shares of Common Stock of the Company which
are issuable upon the exercise of  outstanding  warrants and options to purchase
shares of Common Stock by persons not deemed  "affiliates"  of the  Company,  as
that term is defined under the Securities Act of 1933 the Securities Act.

      This offering  also consists of the resale of 26,000,000  shares of Common
Stock which may be issued upon the conversion of issued and  outstanding  shares
of the Preferred  Stock by persons not deemed  "affiliates"  of the Company,  as
that term is defined under the Securities Act.

      In addition,  this offering  consists of the resale of 6,857,143 shares of
Common Stock which were issued by the Company in private  placements exempt from
registration  under  the  Securities  Act and were  issued  and  outstanding  on
December  19, 1997,  as well as the resale of  4,092,555  shares of Common Stock
which may be issued upon the  exercise of  outstanding  warrants  and options to
purchase shares of Common Stock to persons who may be deemed "affiliates" of the
Company and the resale of 8,032,665 shares of Common Stock to persons not deemed
"affiliates" of the Company, as that term is defined under the Securities Act.

   All of the  foregoing  shares of Common  Stock may be offered for sale by the
holders thereof (see "Selling  Stockholders").  The Company will not receive any
of the proceeds  from the sale of such shares  although the Company will receive
the aggregate  proceeds  from the exercise,  from time to time, of the foregoing
warrants and options to purchase shares of Common Stock (see "Use of Proceeds").


<PAGE>


                               RISK FACTORS

   The shares of Common Stock offered hereby represent a speculative  investment
and entail  elements of risk.  The following  factors,  in addition to the other
information  included or incorporated by reference  herein,  should be carefully
considered  before any  decision is made to purchase any of the shares of Common
Stock offered hereby.

   RISKS ASSOCIATED WITH FORWARD-LOOKING STATEMENTS INCLUDED IN THIS PROSPECTUS.
This  Prospectus  and the  documents  incorporated  herein by reference  contain
certain forward-looking  statements within the meaning of the Private Securities
Litigation  Reform Act of 1995  regarding,  among  other  items,  the  Company's
ability  to  sustain  its   anticipated   future   level  of   operations.   The
forward-looking  statements  included  herein are based on current  expectations
that  involve  numerous  risks and  uncertainties.  Assumptions  relating to the
foregoing  involve  judgments  with  respect  to,  among  other  things,  future
economic,  competitive  and market  conditions,  future  product  sales,  market
penetration  and  customer  acceptance  of the  Company's  products  and  future
business  decisions  by parties  with whom the Company has  alliances  and other
business  relationships,  all of which are  difficult or  impossible  to predict
accurately and many of which are beyond the control of the Company. Although the
Company believes that its assumptions underlying the forward-looking  statements
are reasonable,  any of the assumptions  could prove inaccurate and,  therefore,
there can be no assurance that the  forward-looking  statements included in this
Prospectus and the documents  incorporated  herein by reference will prove to be
accurate.   In  light  of  the   significant   uncertainties   inherent  in  the
forward-looking  statements  included  herein and in the documents  incorporated
herein by reference, the inclusion of such information should not be regarded as
a  representation  by the Company or any other  person that the  objectives  and
plans of the Company will be achieved.

   CURRENT FINANCIAL CONDITION; CASH POSITION; CONDITIONAL ADEQUACY OF CURRENTLY
AVAILABLE  FUNDS TO SUSTAIN  COMPANY.  Cash,  cash  equivalents  and  short-term
investments amounted to $1.0 million at September 30, 1997, increasing from $0.4
million at December 31, 1996.  Management  believes that available cash and cash
anticipated from the exercise of warrants and options,  the funding derived from
forecasted   technology   licensing  fees,   royalties  and  product  sales  and
engineering and development  revenue along with reduced  operating  expenses and
capital expenditures and the "First Quarter 1997 Financing",  the "July 30, 1997
Private  Placement",  the "1997 Preferred Stock Private  Placement" and the "NCT
Audio  Financing"  discussed below should be sufficient to sustain the Company's
anticipated  future level of operations  into 1999.  However,  the period during
1999  through  which  it can be  sustained,  is  dependent  upon  the  level  of
realization of funding from technology  licensing fees and royalties and product
sales and  engineering  and  development  revenue,  all of which  are  presently
uncertain. In the event that forecasted technology licensing fees, royalties and
product  sales,  and  engineering  and  development  revenue are not realized as
planned,  additional  working capital financing could be required in 1999. There
is no assurance any such  financing is or would become  available.  In the event
that  additional  funding  is not  provided  by the  Company's  efforts to raise
additional capital or by technology  licensing fees, royalties and product sales
and engineering and development  revenue,  the Company would have to further and
substantially  cut back its level of operations in order to conserve cash. These
reductions  could have an adverse  effect on the  Company's  relations  with its
strategic  partners  and  customers.  Uncertainty  exists  with  respect  to the
adequacy of current funds to support the  Company's  activities  until  positive
cash flow from operations can be achieved,  and with respect to the availability
of financing from other sources to fund any cash deficiencies.

   Between  January 15, 1997 and March 25, 1997,  the Company issued and sold an
aggregate  amount  of  $3.4  million  of  non-voting  subordinated   convertible
debentures (the "Debentures") in a private placement pursuant to Regulation S of
the  Securities  Act to  five  unrelated  investors  (the  "Investors")  through
multiple  dealers (the "First  Quarter 1997  Financing")  from which the Company
realized $3.2 million of net proceeds. The Debentures mature between January 15,
2000 and March 25, 2000 and earn 8% interest  per annum,  payable  quarterly  in
either cash or the Company's Common Stock at the Company's sole option.  Subject
to certain Common Stock resale restrictions, the Investors, at their discretion,
have the right to convert the principal due on the Debentures into the Company's
Common  Stock at any time after the 45th day  following  the date of the sale of
the  Debentures  to the  Investors.  In the  event  of  such a  conversion,  the
conversion  price is the lesser of 85% of the closing bid price of the Company's
Common Stock on the closing date of the  Debentures'  sale or between 75% to 60%
(depending  on the Investor  and other  conditions)  of the average  closing bid
price for the five trading days immediately preceding the conversion. To provide
for the above  noted  conversion  and  interest  payment  options,  the  Company
reserved 15 million shares of the Company's  Common Stock for issuance upon such
conversion.  Subject to certain  conditions,  the Company  also has the right to
require the Investors to convert all or part of the  Debentures  under the above
noted  conversion  price conditions after February 15, 1998. As of June 6, 1997,
the Investors had converted all $3.4 million of the Debentures into 16.3 million
shares of the Company's  Common Stock. At the Company's  election,  interest due
through the conversion  dates of the Debentures was paid through the issuance of
an additional 0.2 million shares of the Company's Common Stock.

   On March 28,  1997,  the Company,  Verity and NXT executed a cross  licensing
agreement (the "Cross License").  Under terms of the Cross License,  the Company
licensed patents and patents pending which relate to FPT(TM)  technology to NXT,
and NXT licensed patents and patents pending which relate to parallel technology
to the Company.  In  consideration  of the license,  the Company recorded a $3.0
million license fee receivable from NXT as well as royalties on future licensing
and product  revenue.  The Company also executed a security deed (the  "Security
Deed") in favor of NXT granting NXT a conditional  assignment in the patents and
patents  pending  licensed to NXT under the Cross License in the event a default
in a certain payment to be made by the Company under the Cross License continued
beyond fifteen days.  Concurrent with the Cross License,  the Company and Verity
executed agreements granting each an option for a four year period commencing on
March 28, 1998,  to acquire a specified  amount of the common stock of the other
subject to certain  conditions and  restrictions.  With respect to the Company's
option to Verity  (the  "Verity  Option"),  3.8 million  shares of Common  Stock
(approximately  3.4% of the then  issued and  outstanding  Common  Stock) of the
Company  are  covered by such  option and the  Company  executed a  registration
rights agreement (the "Registration Rights Agreement") covering such shares. 5.0
million ordinary shares  (approximately  2.0% of the then issued and outstanding
ordinary  shares) of Verity are  covered by the option  granted by Verity to the
Company.  The  exercise  price under each option is the fair value of a share of
the applicable  stock on March 28, 1997,  the date of grant.  If the Company did
not obtain stockholder  approval of an amendment to its Restated  Certificate of
Incorporation  increasing  its Common Stock  capital by an amount  sufficient to
provide shares of the Company's  Common Stock issuable upon the full exercise of
the option  granted to Verity by  September  30, 1997,  both options  would have
expired.  On April  15,  1997,  Verity,  NXT and the  Company  executed  several
agreements and other  documents  (the "New  Agreements")  terminating  the Cross
License,  the  Security  Deed,  the Verity  Option and the  Registration  Rights
Agreement and replacing  them with new agreements  (respectively  the "New Cross
License",  the  "New  Security  Deed",  the  "New  Verity  Option"  and the "New
Registration  Rights  Agreement").  The  material  changes  effected  by the New
Agreements  were the  inclusion of Verity as a party along with its wholly owned
subsidiary  NXT;  providing that the license fee payable to NCT could be paid in
ordinary  shares of Verity  stock;  and reducing  the  exercise  price under the
option  granted to Verity to purchase  shares of the  Company's  Common Stock to
$0.30 per  share.  The 3.8  million  shares of Common  Stock  issuable  upon the
exercise of the New Verity  Option are  included  in the  offering to which this
prospectus  relates.  At the June 19,  1997  Annual  Meeting,  the  stockholders
approved an amendment to the Company's Restated  Certificate of Incorporation to
increase the authorized number of shares of Common Stock from 140 million shares
to 185 million shares,  and such amendment became effective when it was filed in
the office of the  Secretary of State of Delaware on June 20, 1997. On September
27, 1997, Verity, NXT, NCT Audio Products, Inc. and the Company executed several
agreements and other  documents,  terminating  the New Cross License and the New
Security Deed and replacing them with new agreements  (respectively,  the "Cross
License Agreement dated September 27, 1997" and the "Master License Agreement").
The material changes effected by the most recent agreements were an expansion of
the fields of use  applicable  to the exclusive  licenses  granted to Verity and
NXT,  an  increase  in the  royalties  payable on future  licensing  and product
revenues, cancellation of the New Security Deed covering the patents licensed by
the Company,  and the acceleration of the date on which the parties can exercise
their respective stock purchase option to September 27, 1997.

   On July 30, 1997 the Company sold 2.9 million  shares,  in the aggregate,  of
its Common Stock at a price of $0.175 per share, in a private  placement  exempt
from the  registration  requirements  of the  Securities  Act under Section 4(2)
thereof that provided net proceeds to the Company of $0.5 million (the "July 30,
1997 Private Placement").

   On  September  4, 1997,  the Company  transferred  $5,000 cash and all of the
business  and assets of its Audio  Products  Division as then  conducted  by the
Company and as reflected  on the business  books and records of the Company to a
newly incorporated  company, NCT Audio, in consideration for 5,867 shares of NCT
Audio common stock  whereupon NCT Audio became a wholly owned  subsidiary of the
Company.  The Company also granted NCT Audio an exclusive worldwide license with
respect to all of the  Company's  relevant  patented and  unpatented  technology
relating to FPTs(TM) and FPT(TM)  based audio  speaker  products for all markets
for such products  excluding  (a) markets  licensed to or reserved by Verity and
NXT under the Company's cross licensing  agreements with Verity and NXT, (b) the
ground based  vehicle  market  licensed to OAT, (c) all markets for hearing aids
and other  hearing  enhancing  or  assisting  devices,  and (d) all  markets for
headsets,  headphones and other products performing functions  substantially the
same as those performed by such products in  consideration  for a license fee of
$3.0 million to be paid when proceeds are  available  from the sale of NCT Audio
common stock and on-going future  royalties  payable by NCT Audio to the Company
as  provided in such  license  agreement.  In  addition,  the Company  agreed to
transfer all of its rights and obligations under its cross licensing  agreements
with Verity and NXT to NCT Audio and to transfer the  Company's  interest in OAT
to NCT Audio.  Between  October 10, 1997 and  December 4, 1997 NCT Audio  issued
2,145 shares of its common stock (including the 533 shares issued to Verity) for
an aggregate  purchase price of $4.0 million in a private placement  pursuant to
Regulation D under the Securities Act (the "NCT Audio Financing").

   Between  October 28, 1997 and December 11, 1997,  the Company  entered into a
series of  subscription  agreements (the  "Subscription  Agreements") to sell an
aggregate amount of $13.3 million of the Preferred Stock in a private placement,
pursuant to  Regulation  D of the  Securities  Act, to 32  unrelated  accredited
investors  through two dealers (the "1997 Preferred  Stock Private  Placement").
The total  Preferred  Stock  Offering was  completed  on December 11, 1997.  The
aggregate  net  proceeds  to the  Company of the 1997  Preferred  Stock  Private
Placement were $11.9 million.  Each share of the Preferred Stock has a par value
of $.10 per share and a stated value of one thousand  dollars  ($1,000)  with an
accretion rate of four percent (4%) per annum on the stated value. Each share of
Preferred Stock is convertible into fully paid and  nonassessable  shares of the
Company's  Common Stock subject to certain  limitations.  Under the terms of the
Subscription Agreements the Company is required to file a registration statement
("Registration  Statement")  on Form S-3  covering  the  resale of all shares of
Common Stock of the Company issuable upon conversion of the Preferred Stock then
outstanding within sixty (60) days after the first Closing of the 1997 Preferred
Stock Private  Placement.  The shares of Preferred Stock become convertible into
shares of Common  Stock at any time  commencing  after  the  earlier  of (i) the
effective date of the Registration Statement; or (ii) ninety (90) days after the
date of filing of the Registration  Statement.  Each share of Preferred Stock is
convertible into a number of shares of Common Stock of the Company as determined
in accordance with the following formula (the "Conversion Formula"):


<PAGE>



                       [(.04) x (N/365) x (1,000)] + 1,000
                       -----------------------------------
                               Conversion Price

      where

            N  =        the number of days  between (i) the closing date of the
                        Preferred Stock being converted, and (ii) the conversion
                        date thereof.

            Conversion
            Price  =    the  lesser  of (x)  120%  of the  five  (5) day
                        average closing bid price of Common Stock  immediately 
                        prior to the closing date of the Preferred  Stock being 
                        converted or (y) 20% below  the five (5) day  average  
                        closing  bid  price of Common Stock  immediately  prior 
                        to the conversion  date thereof.

            Closing
            Date  =     the date of the  closing  as set  forth in the 
                        subscription agreement pertaining to the Preferred 
                        Stock being converted.

   The  conversion  terms of the  Preferred  Stock also provide that in no event
shall the average  closing bid price  referred to in the  Conversion  Formula be
less than  $0.625 per share and in no event shall the  Company be  obligated  to
issue more than 26.0  million  shares of its Common  Stock in the  aggregate  in
connection with the conversion of the Preferred Stock. Accordingly, 26.0 million
shares of Common Stock which could be issuable upon  conversion of the Preferred
Stock are included in the offering to which this prospectus  relates.  Under the
terms of the Subscription  Agreements the Company may be subject to a penalty if
the Registration  Statement is not declared  effective within one hundred twenty
(120) days after the first closing of any incremental portion of the offering of
Preferred  Stock,  such  penalty  to be in an  amount  equal to one and one half
percent (1.5%) per month of the aggregate  amount of Preferred Stock sold in the
offering  up to a maximum of ten percent  (10%) of such  aggregate  amount.  The
Subscription Agreements also provide that for a period commencing on the date of
the signing of the Subscription Agreements and ending ninety (90) days after the
closing of the offering the Company will be prohibited  from issuing any debt or
equity  securities  other than Preferred Stock, and that the Corporation will be
required  to make  certain  payments  in the  event  of its  failure  to  effect
conversion  in a timely  manner or in the event it fails to  reserve  sufficient
authorized  but  unissued  Common  Stock for  issuance  upon  conversion  of the
Preferred Stock.

   NO DIVIDENDS.  The Company has never  declared nor paid  dividends on
its common stock and has no present intention to do so.

   GOING CONCERN EMPHASIS PARAGRAPH IN ACCOUNTANTS' OPINION. The Company expects
to continue as a going  concern,  which  contemplates  continuity of operations,
realization of assets and  satisfaction of liabilities in the ordinary course of
business and its financial statements have been prepared on that basis. However,
this going concern basis is dependent upon, among other things,  the achievement
of future profitable operations and the ability to generate sufficient cash from
operations,  public and private financings and other funding sources to meet its
obligations  as  described  in  "Current  Financial  Condition;  Cash  Position;
Conditional Adequacy of Currently Available Funds to Sustain Company" above.

   On February 28, 1997,  Richard A. Eisner & Company,  LLP issued its report on
the  Company's  consolidated  financial  statements as of and for the year ended
December 31, 1996. With respect to Note 15 to those financial  statements,  such
report was dated March 28, 1997; with respect to Note 8 thereto, such report was
dated April 10, 1997; and with respect to Note 7 thereto,  such report was dated
April 18,  1997.  The  report of Richard A.  Eisner &  Company,  LLP  contains a
paragraph which emphasizes  certain factors which are described in Note 1 to the
financial  statements  covered by the  report.  This  paragraph  notes that such
factors raise  substantial  doubt as to the  Company's  ability to continue as a
going concern.  See "Experts-Report of Independent  Auditors" below. Such report
predated the July 30, 1997 Private  Placement,  the 1997 Preferred Stock Private
Placement  and the  NCT  Audio  Financing  referenced  above.  As  noted  above,
Management  believes that available cash and cash  anticipated from the exercise
of  warrants  and  options,  the  funding  derived  from  forecasted  technology
licensing  fees,  royalties and product sales and  engineering  and  development
revenue along with reduced operating  expenses and capital  expenditures and the
First Quarter 1997  Financing  discussed  above and such Private  Placements and
Financing should be sufficient to sustain the Company's anticipated future level
of operations  in 1999,  although the period during 1999 through which it can be
sustained, is dependent upon the level of realization of funding from technology
licensing fees and royalties and product sales and  engineering  and development
revenue,  all  of  which  are  presently  uncertain.  Nevertheless,  prospective
investors are urged to read carefully the report of Richard A. Eisner & Company,
LLP as well as the  consolidated  financial  statements  of the  Company and the
notes thereto,  which are incorporated herein by reference to Amendment No. 1 to
the Company's  Annual Report on Form 10-K for the year ended  December 31, 1996,
filed on April 21, 1997.

   HISTORY OF OPERATING LOSSES AND ACCUMULATED  DEFICIT.  The Company incurred a
net loss of $10.8  million for the year ended  December 31, 1996,  and a loss of
$5.2  million  for the nine months  ended  September  30,  1997.  The  Company's
accumulated  deficit at September 30, 1997 was $88.9  million,  attributable  in
substantial  part to the costs of  developing  its  proprietary  technology.  To
achieve  profitability,  NCT  must,  independently  and with  strategic  allies,
successfully  develop,  manufacture,   introduce  and  market  its  products  in
commercial  quantities  and  receive  fees  and  royalties  from  licensing  its
proprietary technology.

   LIMITED  REVENUES.  Although the Company has engaged in marketing  activities
with  regard to the sale or  licensing  of  electronic  systems  for Active Wave
Management(TM)  including systems that electronically reduce noise and vibration
based upon prototypes of such systems,  its operating revenues from inception in
April 1986 through  September  30, 1997,  have been limited,  aggregating  $10.2
million  from the sale of such  systems,  $14.3  million  from the  licensing of
technology  relating to such systems and $21.3 million from the  performance  of
engineering and  development  services,  respectively.  Although the Company has
begun  commercial  sales of active  noise  attenuation  and other  products in a
limited  number  of  applications,   significant  further  development  will  be
necessary before many of the Company's  potential products will achieve expected
commercial end-use applications.

   POSSIBLE  FUTURE  DILUTION FROM EXERCISE OF OUTSTANDING  WARRANTS AND OPTIONS
AND  CONVERSION  OF  CONVERTIBLE  SECURITIES.  On October 6, 1992,  the  Company
adopted a stock option plan (the "1992 Plan") covering 6.0 million shares of the
Company's Common Stock and providing for the grant of options to purchase Common
Stock of the  Company  and  awards  of  restricted  common  stock to  employees,
officers  and  directors  of the  Company.  The 1992  Plan was  approved  by the
stockholders at the 1993 Annual Meeting of Stockholders following which said 6.0
million shares were  registered  under the  Securities  Act. An amendment to the
1992 Plan adopted by the Option  Committee on November 8, 1995,  and approved by
the  stockholders at the 1996 Annual Meeting of  Stockholders  (the "1996 Annual
Meeting"),  increased  the number of shares of Common Stock  covered by the 1992
Plan to 10.0  million  shares and added  active  consultants  to the  Company as
persons who are  eligible to  participate  under the 1992 Plan.  The Company has
reserved  10.0 million  shares of Common Stock for issuance upon the exercise of
options  granted  under  the  1992  Plan  and for  issuance  upon  the  grant of
restricted  stock awards under the 1992 Plan.  All of such shares are registered
under the  Securities  Act. As of September  30,  1997,  the Company has granted
options  to  purchase  6,847,436  shares of  Common  Stock  which are  currently
exercisable and 85,000 shares of restricted stock under the 1992 Plan.

   On November 15, 1994, the Company  adopted and on May 8, 1995 and November 8,
1995 amended the Noise Cancellation  Technologies,  Inc. Option Plan for Certain
Directors (the "Directors  Plan"),  pursuant to which options to purchase in the
aggregate  821,000  shares of Common Stock were granted to two  directors of the
Company.  The Directors Plan was approved by the  stockholders  at the Company's
1995 Annual Meeting of  Stockholders  as to options to purchase in the aggregate
725,000  shares of Common Stock.  An amendment to the Directors  Plan adopted by
the Board of Directors on November 8, 1995, and approved by the  stockholders at
the 1996 Annual Meeting,  increased the number of shares of Common Stock covered
by the Plan to 821,000  shares and made certain  minor  changes  concerning  the
Plan's  administration.  The Company has reserved 821,000 shares of Common Stock
for issuance upon the exercise of the options  granted under the Directors  Plan
and has registered such 821,000 shares under the Securities Act. As of September
30, 1997, the Company has granted  options to purchase  821,000 shares of Common
Stock which are currently exercisable under the Directors Plan.

   On April 15, 1997, in connection with the cross license  agreement  described
above entered into by the Company,  Verity and NXT, the Company  granted  Verity
the New Verity  Option to purchase 3.8 million  shares of the  Company's  Common
Stock for a four year period  commencing on the first  anniversary of the option
agreement.  By mutual  agreement  the New Verity Option  became  exercisable  on
September 27, 1997.  The Company has reserved 3.8 million shares of Common Stock
for issuance upon the exercise of the Verity Option. The Company also agreed, if
requested  by  Verity,  to file a  registration  statement  with the  Commission
covering the shares of Common Stock issuable upon the exercise of the New Verity
Option and to use its diligent best efforts to effect the  registration  of such
shares. All of such shares are included in the offering to which this prospectus
relates.

   As of September 30, 1997,  the Company has reserved  378,894 shares of Common
Stock for issuance upon the exercise of warrants and options granted outside the
1992 Plan and the  Directors  Plan which the  Company has  registered  under the
Securities Act and has reserved  75,000 shares of Common Stock for issuance upon
the  exercise of the Investor  Warrant.  The Company has also  reserved  466,250
shares  for  issuance   upon  the  exercise  of  warrants   granted  in  partial
consideration  for services  rendered by two placement agents in connection with
the 1997 Preferred  Stock Private  Placement and by one financial  consultant in
connection  with another  financing  completed by the Company and 100,000 shares
for issuance upon the exercise of options granted to two non-employee  directors
of the Company,  subject to the approval of the Company's  stockholders.  All of
such shares are included in the offering to which this prospectus relates except
the 75,000 shares issuable upon the exercise of the Investor Warrant.

   At December 19, 1997, the weighted  average  exercise price for all currently
exercisable and outstanding warrants and options was $0.6293.

   Between  October 10, 1997 and December 4, 1997, a subsidiary  of the Company,
NCT  Audio,  raised  $4.0  million  of equity  capital by means of the NCT Audio
Financing.  Under  the  terms of the  subscription  agreements  for the sale and
purchase of NCT Audio common stock entered into in connection  with this private
placement,  the purchasers are granted the right  commencing 90 days after their
purchase  of NCT  Audio  common  stock to  exchange  such  common  stock for the
Company's  Common Stock at an exchange ratio which will provide the purchasers a
value in the Company's  Common Stock equal to the amount paid by the  purchasers
for NCT  Audio  common  stock  in  accordance  with an  agreement  between  such
purchasers  and the Company.  However,  the  purchasers  may not  exercise  this
exchange  right if a  registration  statement of NCT Audio for an initial public
offering of NCT Audio  common  stock is filed with the SEC within 90 days of the
delivery of the purchase  price for the NCT Audio common stock by the purchasers
thereof, but such exchange right is renewed if such registration  statement does
not become  effective  within 180 days after such purchase price  delivery.  The
Company is under no  obligation  to register any of the shares of the  Company's
Common  Stock  which  may be  issued  in  connection  with the  exercise  of the
foregoing  exchange  right although such Common Stock of the Company may be sold
pursuant to an  applicable  exemption  from  registration.  Because the exchange
ratio will be  determined  by using 80% of the average  closing bid price of the
Company's  Common Stock over the five day trading period  immediately  preceding
such date the exchange  right is  exercised,  it is not  possible to  accurately
determine the maximum number of shares of the Company's  Common Stock that would
be issued if all of the  purchasers  of NCT Audio common stock  elected to fully
exercise their exchange rights.  If all of the purchasers of the $4.0 million in
the  aggregate  of NCT Audio common stock  purchased  pursuant to the  foregoing
private placements, become entitled to exercise such exchange right and do so at
a time when the average closing bid price of the Company's  Common Stock for the
five trading days immediately preceding the date on which the exchange right was
exercised  was the same as it was on  September  30, 1997 ($0.625 per share) the
Company would be required to issue 8.0 million  shares of its Common  Stock.  No
assurance can be made that the price of the  Company's  Common Stock will not be
significantly lower than $0.625 per share in which event a significant number of
additional  shares of the  Company's  Common Stock would be issued in connection
with such exchange.

   Between  November 3, 1997 and December  11, 1997 the Company  issued and sold
13,250  shares  of the  Preferred  Stock in the  1997  Preferred  Stock  Private
Placement.  The  Preferred  Stock is  convertible  into shares of the  Company's
Common  Stock in  accordance  with the  Conversion  Formula  and other terms and
conditions  set  forth  in the  subscription  agreements  relating  to the  1997
Preferred Stock Private Placement. The Preferred Stock is also redeemable by the
Company in cash or in the Company's  Common Stock in accordance with other terms
and  conditions  set  forth  in  such  subscription   agreements.   Because  the
calculations  required to determine the number of shares of the Company's Common
Stock to be issued upon  conversion or redemption of the Preferred Stock will be
based upon the length of time the Preferred  Stock is held as well as the lesser
of (x)  120% of the five (5) day  average  closing  bid  price of  Common  Stock
immediately  prior to the closing date of the Preferred Stock being converted or
(y) 20%  below  the five (5) day  average  closing  bid  price of  Common  Stock
immediately  prior  to  the  conversion  date  thereof,  it is not  possible  to
accurately  determine the maximum number of shares of the Company's Common Stock
that would be issued upon any such  conversion or redemption.  All 13,250 shares
of the  Preferred  Stock were issued  when the average  closing bid price of the
Company's Common Stock for the five trading days immediately  preceding issuance
was higher than its price on September 30, 1997  ($0.625).  Therefore  under the
Conversion Formula if all 13,250 shares of the Preferred Stock were converted or
redeemed one year  following  the issuance  thereof and the average  closing bid
price of the  Company's  Common  Stock  for the five  trading  days  immediately
preceding the  conversion  or  redemption  date was the same as on September 30,
1997 ($0.625), the Company would be required to issue 27.6 million shares of its
Common  Stock  except  that  under the terms of  conversion  as set forth in the
subscription  agreements and in the Certificate of Designations  Preferences and
Rights of the Preferred  Stock  establishing  the Preferred  Stock in accordance
with the provisions of the General Corporation Law of the State of Delaware,  in
no event is the Company  obligated to issue more than 26.0 million shares of its
Common Stock in the aggregate in connection with the conversion of the Preferred
Stock. Accordingly,  26.0 million shares of Common Stock which could be issuable
upon  conversion  of the  Preferred  Stock are included in the offering to which
this prospectus relates.

   The  possibility  of the sale of the shares of Common Stock  described in the
preceding  paragraphs  of this "risk  factor",  all of which  (except the shares
described  in the  paragraph  relating to the NCT Audio  Financing)  the Company
plans to  register  under the  Securities  Act to the extent they are not now so
registered or exempt from the  registration  requirements of the Securities Act,
may adversely affect the market price of the Company's Common Stock.

   MATERIAL  DEPENDENCE  UPON  CERTAIN  PATENT  RIGHTS;   UNCERTAIN  PROPRIETARY
PROTECTION.  No assurance  can be given as to the range or degree of  protection
any patent  issued to, or  licensed  by, the  Company  will  afford or that such
patents or licenses will provide protection that has commercial  significance or
will provide competitive advantages for the Company's products. No assurance can
be given that the  Company's  owned or licensed  patents will afford  protection
against  competitors  with  similar  technology,  or that others will not obtain
patents  claiming  aspects  similar to those covered by the  Company's  owned or
licensed patents or patent applications.  No assurance exists that the Company's
owned or licensed patents will not be challenged by third parties,  invalidated,
rendered  unenforceable  or  designed  around.  Furthermore,  there  can  be  no
assurance  that any pending patent  applications  or  applications  filed in the
future will result in the issuance of a patent.  The  invalidation or expiration
of patents  owned or licensed  by the Company and  believed by the Company to be
commercially  significant  could permit  increased  competition,  with potential
adverse effects on the Company and its business prospects.  Although the Company
intends to file for  extensions  to certain  patents,  the  Company  can make no
assurances that the U.S. or foreign  government  patent  authorities  will grant
such extensions.

   The Company has conducted only limited patent  searches and no assurances can
be given  that  patents  do not exist or will not be issued in the  future  that
would have an adverse effect on the Company's  ability to market its products or
maintain its  competitive  position  with respect to its  products.  Substantial
resources may be required to obtain and defend patent rights to protect  present
and future technology of the Company.

   An  interference  proceeding  has been  initiated  with respect to one of the
Company's  patent  applications.  There has also been an inquiry  regarding  the
product design configuration of one of the Company's products as it relates to a
patent held by another company.  Another  competitor has implied that a possible
conflict  exists between the Company's  application of certain of its technology
and a patent  recently  allowed to the  competitor and that the Company's use of
what the Company  believes is a generic phrase  conflicts with a trademark which
the  competitor  has  applied  for.  The Company  believes  that such claims and
inquiry are without merit and intends to oppose them  vigorously.  Moreover,  if
such inquiry proves to have any merit,  the Company  believes it could,  without
significant  cost,  modify  its  product  design  configuration  so as to  avoid
infringement.  The  Company  does not  believe  that any damages or costs it may
incur as a result of such claims or inquiry would have a material adverse effect
on the financial condition of the Company.

   The Company's policy is to enter into confidentiality  agreements with all of
its executive officers,  key technical personnel and advisors, but no assurances
can be made that Company  know-how,  inventions  and other secret or unprotected
intellectual property will not be disclosed to third parties by such persons.

   RAPID  TECHNOLOGICAL  CHANGE.  Active  Wave  Management(TM)  is  an  evolving
industry,  characterized by rapid  technological  change. The Company intends to
engage  continually  in  research  and  development  activities,  including  the
improvement of current products and development of new products. There can be no
assurance,  however,  that  active  noise  and  vibration  attenuation  or other
applications  of Active Wave  Management(TM)  will be accepted by the commercial
marketplace,  that the  introduction  of new products or the  development of new
technologies  by others  will not  render the  Company's  products  obsolete  or
unmarketable,  or that  the  Company  will be able to hire and  retain  adequate
research personnel or be able to finance research activities in this regard.

   RELIANCE UPON STRATEGIC ALLIANCES; COMMERCIAL ACCEPTANCE OF END-PRODUCTS. The
Company  and  certain  of  its  wholly  owned  subsidiaries  have  entered  into
agreements to establish strategic alliances related to the design,  development,
manufacture,  marketing and distribution of its electronic  systems and products
containing such systems.  These  agreements  generally  provide that the Company
license its technology  and  contribute a nominal amount of initial  capital and
that the other  party  provide  substantially  all of the funding to support the
alliance.  In exchange for this funding,  the other party  generally  receives a
preference in the  distribution  of cash and/or  profits or royalties from these
alliances until such time as the support funding,  plus an "interest"  factor in
some  instances,  is recovered.  At September 30, 1997,  there were no preferred
distributions  due to joint venture  partners  from future  profits of the joint
ventures.

   The Company conducts its marketing efforts primarily by identifying  specific
market segments for active noise and vibration attenuation and other Active Wave
Management(TM)   products  and,  thereafter,   seeking  to  establish  strategic
alliances with major  domestic and  international  business  concerns to support
product development,  and to manufacture and distribute products for such market
segments.  The  Company's  ability  to enter  into  new  markets  is  materially
dependent upon  determinations by such concerns that the Company's  products are
suitable  for use in  their  respective  end-products,  and on the  ability  and
willingness of those concerns to market such products successfully. During 1995,
1996 and the nine month period ended September 30, 1997,  active headset product
sales did not increase at the rate previously  anticipated and orders for active
vehicular mufflers, kitchen exhaust and HVAC fan quieting systems and industrial
headsets  were not  received  at volumes  or within  time  frames  that had been
anticipated by the Company.

   The Company  arranges for the supply of  actuators,  integrated  circuits and
other  electronic  components for its active control systems  through  alliances
with  manufacturers  the Company  believes will serve as  dependable  sources of
supply.  The  Company  makes no  assurances  that these  concerns  will meet the
Company's  and  its  customers'  needs  for  quality  components  in  sufficient
quantities at commercially reasonable prices.

   CUMULATIVE  LOSSES IN JOINT VENTURES.  When the Company's share of cumulative
losses in a strategic  alliance  exceeds its  investment  and the Company has no
obligation to fund such additional  losses,  the Company  suspends  applying the
equity method of accounting for its  investment in such alliance.  The estimated
aggregate amount of losses in the Company's strategic alliances in excess of the
Company's investments which has not been recorded was not considered material at
September 30, 1997.  The Company will not be able to record any equity in income
with respect to an entity  until its share of future  profits is  sufficient  to
recover any cumulative losses that have not previously been recorded.

   DEPENDENCE  UPON EXECUTIVE  OFFICERS AND OTHER KEY  PERSONNEL.  The Company's
operations are, and for the proximate future will be, materially  dependent upon
the efforts of its executive officers and key technical  employees,  all of whom
serve  the  Company  on a  full-time  basis  but none of whom are  contractually
obligated to remain in the Company's employ for any material term. Moreover, the
Company's  growth and  expansion  into new product  applications  could  require
additional expertise in areas such as manufacturing, marketing and distribution,
which would place increased demands on the Company's resources and would require
the addition of new personnel  and the  development  of additional  expertise by
existing  personnel.  Certain  academic  consultants  serve  the  Company  on  a
part-time basis, and could terminate their  relationship with the Company at any
time.

   Certain  employees and consultants of the Company have been approached by the
Company's competitors,  and no assurances can be given that the competition will
not  successfully  recruit  such  personnel.  The loss of key  personnel  or the
failure to recruit necessary  additional  personnel could impede the achievement
of the Company's development, commercialization and marketing objectives.

   POSSIBLE RISKS ASSOCIATED WITH AGREEMENTS WITH RELATED  PARTIES;  COMMISSIONS
AND EXCLUSIVE DISTRIBUTORSHIPS. In 1993 the Company entered into four agreements
with QuietPower  Systems,  Inc. ("QSI") (formerly Active  Acoustical  Solutions,
Inc.) and in 1994 entered into a fifth  agreement  with QSI. QSI is 33% owned by
Environmental  Research  Information,  Inc. ("ERI") and 2% owned by Jay M. Haft,
Chairman  of the  Board  of  Directors  of the  Company.  Michael  J.  Parrella,
President of the Company owns  approximately  12% of the outstanding  capital of
ERI and Mr.  Haft  shares  investment  control  over  an  additional  24% of the
outstanding  capital of ERI.  Under  these  agreements,  QSI is given  rights to
market certain of the Company's  products and  technologies  to electric  and/or
natural  gas  utilities  and for use in or with  feeder  bowls.  In one of these
agreements,  QSI's rights are on an exclusive basis so long as QSI meets certain
performance criteria relating to marketing efforts and sales performance.  Under
one of these agreements,  QSI is entitled to receive a sales commission equal to
129% of QSI's marketing  expenses  attributable to the marketing of the products
in  question,  which  expenses are to be deemed to be the lesser of QSI's actual
expenses or 35% of the  revenues  received by the Company  from the sale of such
products.  Commissions and fees payable under all of the other agreements are in
accordance  with the Company's  standard  terms and conditions and do not exceed
6%. As of the date of this Prospectus,  the Company has not been required to pay
any commissions to QSI under these agreements.

   In March 1995,  the Company  entered into a Master  Agreement  with QSI under
which QSI was granted an exclusive  worldwide  license under certain NCT patents
and technical  information to market, sell and distribute  transformer  quieting
products,  turbine  quieting  products and certain other products in the utility
industry. Under the Master Agreement, QSI is to fund development of the products
by the Company and the Company is to manufacture the products.  However, QSI may
obtain  the  right to  manufacture  the  products  under  certain  circumstances
including NCT's failure to develop the products or the failure of the parties to
agree on certain  development  matters.  In  consideration of the rights granted
under the  Master  Agreement,  QSI is to pay the  Company a royalty of 6% of the
gross  revenues  received  from the sale of the  products  and 50% of the  gross
revenues  received from  sublicensing the rights granted to QSI under the Master
Agreement  after  QSI has  recouped  150% of the  costs  incurred  by QSI in the
development of the products in question. The Company is obligated to pay similar
royalties to QSI on its sale of the products and the licensing of rights covered
under the Master  Agreement  outside  the  utility  industry  and from sales and
licensing  within the  utility  industry  in the Far East.  In  addition  to the
foregoing  royalties,  QSI is to  pay an  exclusivity  fee  to  the  Company  of
$750,000; $250,000 of which QSI paid to the Company in June 1994. The balance is
payable in equal monthly  installments of $16,667 beginning in April 1995. QSI's
exclusive rights become  non-exclusive  with respect to all products if it fails
to pay any installment of the exclusivity fee when due and QSI loses such rights
with respect to any given product in the event it fails to make any  development
funding payment applicable to that product.  The Master Agreement supersedes all
other agreements  relating to the products  covered under the Master  Agreement,
including those agreements between the Company and QSI described above.

   Immediately following the execution to the Master Agreement,  the Company and
QSI entered into a letter agreement  providing for the termination of the Master
Agreement at the Company's election if QSI did not pay approximately $500,000 in
payables then owed to the Company by May 15, 1995.

   In April 1995,  the Company and QSI entered  into  another  letter  agreement
under  which QSI  agreed to  forfeit  and  surrender  the five year  warrant  to
purchase  750,000  shares of the Company's  Common Stock issued to QSI under the
first Marketing Agreement described above. In addition,  the $500,000 balance of
the  exclusivity  fee  provided  for under the Master  Agreement  was reduced to
$250,000 to be paid in 30 monthly installments of $8,333 each and the payment of
the  indebtedness  to be  paid  under  the  letter  agreement  described  in the
proceeding  paragraph was revised to be the earlier of May 15, 1996, or the date
of closing of a financing of QSI in an amount exceeding $1.5 million,  whichever
first  occurs.  Such  indebtedness  was to be evidenced  by a  promissory  note,
non-payment of which would  constitute an event of termination  under the Master
Agreement.

   In May,  1996,  the Company and QSI entered  into  another  letter  agreement
extending the time by which the payments from QSI to the Company under the April
1995  letter  agreement  described  above were to be made.  Under the letter the
payment of certain  arrearages in the payment of the  exclusivity  fee was to be
made not later than June 15, 1996, with the balance  continuing to be payable by
monthly payments of $8,333 and as provided in the May 1995 letter agreement.  In
addition the payment of the other indebtedness owed by QSI to the Company was to
be paid by a payment  of $25,000 at the time QSI  obtained  certain  anticipated
financing with the balance paid by monthly payments of $15,000 each.  Default in
QSI's timely payment of any of the amounts  specified in the May 21, 1996 letter
agreement was to cause the immediate termination of the Master Agreement and all
rights granted to QSI thereunder.

   On April 9, 1997, the Company and QSI entered into another  letter  agreement
revising  the payment  schedule  set forth in the May 21, 1996 letter  agreement
applicable to the payment of the  indebtedness  owed to the Company by QSI other
than the unpaid portion of the exclusivity fee. Under the revised schedule,  the
full amount of such indebtedness is to be paid by an initial payment of $125,000
on or before April 21, 1997,  and a second  payment of $200,000 upon the closing
of a proposed  financing  in June 1997 or on January  1, 1998,  whichever  first
occurs.  The  Company is also  entitled  to receive  15% of any other  financing
obtained  by QSI in the interim as well as interest at the rate of 10% per annum
on the  unpaid  amount  of such  indebtedness  from  July 1,  1997.  The  letter
agreement  also  provides for the  continuation  of QSI's  payment of $11,108 by
April 21, 1997, for headset  products sold by the Company to QSI in 1996. In the
event of a default in QSI's  timely  payment of any of the amounts  specified in
the April 9,  1997  letter  agreement,  the  Company  has the right to cause the
termination  of the Master  Agreement and all rights  granted by QSI  thereunder
upon 10 days notice of termination to QSI.

   As of September 30, 1997, QSI has paid all  installments  due and payable for
the exclusivity  fee and, other than as described  above, as of the date of this
Prospectus, owes no other amounts to the Company.

   The Company believes that the terms of its agreements with QSI are comparable
to those that it could have negotiated with other persons or entities.

   COMPETITION.  The Company is aware of a number of direct  competitors  in the
field of Active Wave  Management(TM).  Indirect  competition  also exists in the
field  of  passive  sound  and  vibration  attenuation.  The  primary  bases  of
competition for each product or potential product of the Company are the cost of
an active  system and its  system  performance  measured  by the level of noise,
vibration, wave or signal attenuation compared to the cost and performance of an
alternative  active or passive  solution  for the  problem in  question.  At the
present  time  passive  solutions  generally  are  less  expensive  than  active
solutions,  although passive  solutions do not provide as great a level of sound
attenuation at the more harmful lower frequencies. The Company's principal known
competitors in active control systems are Andrea Electronics  Corporation,  Bose
Corporation,  Digisonix (a division of Nelson Industries,  Inc.), Hitachi, Ltd.,
Group Lotus PLC and Lotus Cars Limited,  Lord Corporation,  Matsushita  Electric
Industrial Co., Ltd.,  Sennheiser  Electronic Corp.,  Sony Corporation,  Toshiba
Corp.,  Koss  Corporation  and Recoton,  Inc.  among  others.  To the  Company's
knowledge,  each of such  entities  is  pursuing  its own  technology  in active
control  systems,  either on its own or in  collaboration  with others,  and has
recently commenced attempts to exploit commercially such technology. The Company
also believes that a number of other large companies, such as the major domestic
and foreign electronics, automobile and appliance manufacturers,  aircraft parts
suppliers and  manufacturers  and  communications  companies,  have research and
development  efforts underway in Active Wave Management(TM) and active noise and
vibration control.  Many of these companies,  as well as the Company's potential
competitors in the passive sound attenuation field and other entities that could
enter the Active Wave Management(TM) and active noise and vibration  attenuation
fields as the industry  develops,  are well  established and have  substantially
greater  management,  technical,  financial,  marketing and product  development
resources  than the  Company.  In  addition,  the  Company is aware that  Andrea
Electronics  Corporation  is proceeding  with the  commercialization  of in-wire
noise cancellation with one or more major providers of telephone  services.  The
Company  also  believes  that a number  of major  telecommunications  and  other
electronics  companies  such as AT&T  Corporation,  Texas  Instruments  Inc. and
Motorola Inc. are or may be developing in wire noise cancellation and electronic
speech   filtering   technologies   similar  to  those   being   developed   and
commercialized by the Company. The Company is unable to determine at the present
time  what  impact  such  efforts  might  have  on  the  Company's   ability  to
successfully  commercialize  its in-wire  technology  for use in telephones  and
other communications applications.

   POSSIBLE NEED FOR ADDITIONAL  FINANCING.  Historically,  the Company financed
its operations  through public and private  placements of equity and through the
exercise of options and warrants granted to directors,  employees and others, as
well as with  license  fees  and  research  and  development  funding  from  its
strategic allies.  Management  believes that available cash and cash anticipated
from the exercise of warrants and options,  the funding  derived from forecasted
technology  licensing  fees,  royalties and product sales,  and  engineering and
development   revenue,   along  with  reduced  operating  expenses  and  capital
expenditures  and the First  Quarter 1997  Financing,  the July 30, 1997 Private
Placement,  the  1997  Preferred  Stock  Private  Placement  and the  NCT  Audio
Financing should be sufficient to sustain the Company's anticipated future level
of operations into 1999. However, the period during 1999 through which it can be
sustained is dependent upon the level of realization of funding from  technology
licensing fees and royalties and product sales and  engineering  and development
revenue  and the  achievement  of the  operating  cost  savings  from the events
described  above,  all of which  are  presently  uncertain.  In the  event  that
forecasted   technology   licensing  fees,  royalties  and  product  sales,  and
engineering  and  development  revenue are not  realized as planned,  additional
working capital  financing could be required in 1999.  There is no assurance any
such  financing  is or would  become  available.  In the event  that  additional
funding is not provided by the Company's efforts to raise additional capital, or
by  technology  licensing  fees,  royalties,   product  sales,  engineering  and
development  revenue,  the  Company  would have to further cut back its level of
operations  substantially in order to conserve cash. These reductions could have
an adverse  effect on the Company's  relations  with its strategic  partners and
customers.

   NASDAQ/NMS LISTING  REQUIREMENTS;  DISCLOSURE  RELATING TO LOW-PRICED STOCKS.
The Company's  Common Stock  currently is quoted on the National  Association of
Securities   Dealers,   Inc.   Automated   Quotation   National   Market  System
("NASDAQ/NMS"). The NASDAQ/NMS has adopted quantitative maintenance criteria for
continued  listing by the  NASDAQ/NMS  under which a company is required,  among
other things, to maintain net tangible assets of at least (i) $2.0 million if it
has sustained losses from continuing  operations and/or net losses in two of its
three most recent fiscal years or (ii) $4.0 million if it has  sustained  losses
from  continuing  operations  and/or net losses in three of its four most recent
fiscal years,  and from and after February 22, 1998, the Company's  Common Stock
must have a minimum  bid price of $1.00.  Failure of the  Company to continue to
meet the  maintenance  requirements  could result in the Common Stock losing its
NASDAQ/NMS  designation.   The  NASDAQ/NMS  provides  brokers  and  others  with
immediate  access to the best bid and asked prices and other  information  about
the Common  Stock  during each  trading  day.  If the  Company  were to lose its
NASDAQ/NMS  designation,  real-time price information for the Common Stock might
cease to be available.  As a result, a stockholder  might find it more difficult
to dispose of, or to obtain  accurate  quotations as to the price of, the Common
Stock. In addition, if the Company were to lose the NASDAQ/NMS designation,  the
Common  Stock might no longer  qualify as a "margin  security" as defined by the
Federal Reserve Board.

   If the  Company  were to lose its  NASDAQ/NMS  designation  and,  at any time
following  the loss of such  designation,  did not have either (i) net  tangible
assets  in excess of $2.0  million  or (ii)  average  revenue  of at least  $6.0
million for the last three years,  the Common Stock could become  subject to the
Commission's  "penny stock" rules. The penny stock rules impose additional sales
practice  requirements on broker-dealers who sell securities designated as penny
stocks  to  persons  other  than  established  customers  and  certain  types of
accredited  investors.  For  transactions  covered by the penny stock rules, the
broker-dealer  must make a special  suitability  determination for the purchaser
and must have received the purchaser's  written consent to the transaction prior
to the sale.  The rules require the  delivery,  prior to the  transaction,  of a
disclosure  schedule  prepared  by the  Commission  relating  to the penny stock
market.  The rules also require  disclosure by the  broker-dealer of commissions
payable to both the broker-dealer and the registered  representative and current
quotations for the securities. If the broker-dealer is the sole market-maker for
the  penny  stock,   the   broker-dealer   must   disclose  this  fact  and  the
broker-dealer's  presumed control over the market.  Finally,  monthly statements
must be sent disclosing recent price information for the penny stock held in the
customer's  account and  information on the limited market in penny stocks.  The
additional  burdens  imposed  upon  broker-dealers  by the penny stock rules may
discourage  broker-dealers from effecting transactions in penny stocks. Thus, if
the  Common  Stock were to fall  within the  definition  of a penny  stock,  the
liquidity  of the Common  Stock  could be reduced  and there could be a material
effect on the trading market for the Common Stock.

   POSSIBLE  VOLATILITY  OF COMMON STOCK.  The market  prices for  securities of
emerging and  high-technology  companies have historically been highly volatile.
Future  announcements  concerning  the Company or its  competitors  could have a
significant impact on the market price of the Common Stock.

   BLANK CHECK PREFERRED  STOCK.  The Board of Directors has total discretion in
the issuance and the determination of the rights and privileges of any shares of
Preferred Stock which might be issued in the future, which rights and privileges
may be detrimental to the holders of the Common Stock. The Company is authorized
to issue 10.0 million shares of Preferred Stock 13,250 shares of which have been
designated  to  date.  The  issuance  of  Preferred  Stock in the  future  could
discourage or impede a tender offer, proxy contest or other similar  transaction
involving a potential change in control of the Company,  which transaction might
be viewed favorably by other shareholders.

  RISKS  ASSOCIATED WITH YEAR 2000.  Management has reviewed the potential risks
associated  with the year  2000 as it  relates  to  system-based  software,  and
management  has  determined  that such  risk,  if any,  will not have a material
impact on operations or the financial condition of the Company.


  RECENTLY  ISSUED  ACCOUNTING  PRONOUNCEMENTS.  In February 1997, the Financial
Accounting  Standards Board issued Statement of Financial  Accounting  Standards
No. 128 ("FAS  128"),  "Earnings  per Share".  This new standard  requires  dual
presentation of basic and diluted earnings per shares ("EPS") on the face of the
statements  of income and  requires  reconciliation  of the  numerators  and the
denominators of the basic and diluted EPS  calculations.  This statement will be
effective  for the Company's  1997 year end. The Company has not yet  quantified
what  effect the  adoption of SFAS 128 will have on its loss per share of common
stock.

  The Financial  Accounting  Standards Board has recently  issued  Statements of
Financial Accounting Standards No. 129, "Disclosure of Information about Capital
Structure", No. 130, "Reporting Comprehensive Income", and No. 131, "Disclosures
about  Segments of an Enterprise and Related  Information".  The Company has not
determined  whether the above  pronouncements  will have a significant effect on
the information presented in its financial statements.

   LITIGATION.  On or about June 15, 1995,  Guido Valerio filed suit against the
Company in the Tribunal of Milan,  Milan,  Italy. The suit requests the Court to
award  judgment in favor of Mr.  Valerio as follows:  (i)  establish and declare
that a proposed  independent  sales  representation  agreement  submitted to Mr.
Valerio by the Company and signed by Mr. Valerio but not executed by the Company
was made and entered into between Mr.  Valerio and the Company on June 30, 1992;
(ii)  declare  that the  Company  is guilty of breach of  contract  and that the
purported agreement was terminated by unilateral and illegitimate  withdrawal by
the  company;  (iii)  order the Company to pay Mr.  Valerio  $30,000 for certain
amounts  alleged  to be owing to Mr.  Valerio  by the  Company;  (iv)  order the
Company to pay  commissions to which Mr. Valerio would have been entitled if the
Company had followed up on certain  alleged  contacts made by Mr. Valerio for an
amount to be assessed by  technicians  and  accountants  from the Court Advisory
Service;  (v) order the Company to pay damages for the harm and losses sustained
by Mr.  Valerio in terms of loss of earnings  and failure to receive due payment
in an amount such as shall be determined  following  preliminary  investigations
and the assessment to be made by experts and accountants from the Court Advisory
Service and in any event no less than 3 billion Lira ($18.9  million);  and (vi)
order the Company to pay damages for the harm done to Mr. Valerio's image for an
amount such as the judge shall deem  equitable  and in case for no less than 500
million Lira ($3.1 million). The Company retained an Italian law firm as special
litigation counsel to the Company in its defense of this suit. On March 6, 1996,
the  Company,  through  its  Italian  counsel,  filed a brief of reply  with the
Tribunal of Milan  setting  forth the  Company's  position  that:  (i) the Civil
Tribunal of Milan is not the proper venue for the suit, (ii) Mr. Valerio's claim
is  groundless  since the parties  never  entered into an  agreement,  and (iii)
because Mr.  Valerio is not enrolled in the official  Register of Agents,  under
applicable  Italian law Mr. Valerio is not entitled to any  compensation for his
alleged  activities.  A preliminary  hearing before the Tribunal was held on May
30, 1996,  certain pretrial  discovery has been completed and a hearing before a
Discovery  Judge was held on October 17, 1996.  Submissions of the parties final
pleadings  were to be  made in  connection  with  the  next  hearing  which  was
scheduled for April 3, 1997. On April 3, 1997,  the  Discovery  Judge  postponed
this hearing to May 19, 1998, due to a reorganization of all proceedings  before
the Tribunal of Milan.  Management is of the opinion that the lawsuit is without
merit and will  contest  it  vigorously.  In the  opinion of  management,  after
consultation  with outside  counsel,  resolution  of this suit should not have a
material  adverse  effect on the  Company's  financial  position or  operations.
However,  in the event  that the  lawsuit  does  result in a  substantial  final
judgment against the Company,  said judgment could have a severe material effect
on quarterly or annual operating results.


<PAGE>


                             USE OF PROCEEDS

   All of the shares of Common  Stock  offered  hereby are being  offered by the
Selling  Stockholders  and the Company will not receive any of the proceeds from
their sale.  However,  the Company will receive the aggregate  proceeds from the
exercise,  from time to time,  of the  warrants  and options to purchase  Common
Stock described on the cover of this  prospectus and under "The  Offering".  The
exercise  price for such  options  and  warrants  ranges from $0.20 to $5.36 per
share. The aggregate proceeds, from the exercise of all such warrants or options
would be $8,864,194 and, to the extent realized,  will be added to the Company's
working  capital.  The expenses  payable by the Company in connection  with this
registration  statement are estimated to be $37,929. There are no other material
incremental expenses attributable solely to the issuance and distribution of the
above described shares.



<PAGE>


                          SELLING STOCKHOLDERS

   The  following  table  sets forth  certain  information  with  respect to the
Selling  Stockholders.  The shares set forth  therein have been  included in the
Registration  Statements  of which  this  Prospectus  forms a part  pursuant  to
registration  commitments  afforded to the Selling  Stockholders  by contractual
obligations.  The Company  will not receive  any  proceeds  from the sale of the
shares by the Selling Stockholders.

<TABLE>
<CAPTION>
                                                            Number                      Beneficial
                                                            of                          Ownership
                                      Beneficial            Shares                      of Shares
                                      Ownership             of                          of Common
                                      of Shares             Common                      Stock After
                                      of Common             Stock                       Giving
                     Relationship     Stock at              Offered                     Effect to
Name of Selling      With             December              For                         Proposed
Stockholder          The Company      19, 1997     (1)      Sale (1)                    Sale (1)
- ---------------      ------------     ------------------    ------------------          -------------------
                                                              
<S>                  <C>              <C>         <C>       <C>         <C>             <C>         <C> 
1176697 Ontario                          392,453  (19)         392,453  (19)                     -
Limited

Alexander, Wescott &                      78,750                78,750                           -
Co., Inc.

Arab Commerce                            245,283  (19)         245,283  (19)                     -
Bank Ltd.

Atlantis Capital                       1,412,830  (19)       1,412,830  (19)                     -
Fund, Ltd.

BarAub Corp.                              49,057  (19)          49,057  (19)                     -

Black Sea                                588,679  (19)         588,679  (19)                     -
Investments, Ltd.

Canadian Advantage                     1,187,170  (19)       1,187,170  (19)                     -
Limited Partnership

CEFEO Investments,                     2,060,377  (19)       2,060,377  (11)(19)                 -
Limited                             

Michael Dickerson                      2,067,698               600,000                   1,467,698

Dominion Capital                       4,993,962  (19)       4,993,962  (12)(19)                 -
Fund, Ltd.                                      

Excalibur Limited                        981,132  (19)         981,132  (19)                     -
Partnership

Faisal Finance                           784,906  (19)         784,906  (19)                     -
(Switzerland) SA

Fernhill Holding Ltd.                    392,453  (19)         392,453  (19)                     -

First Atlanta                             37,500                37,500                           -
Securities, LLC

First Empire                             392,453  (19)         392,453  (19)                     -
Corporation

Ronald Frisch                            215,849  (19)         215,849  (19)                     -

Graham Eatwell           (2)             131,475                75,000                      56,475

William W. Gerecke                        47,150                35,000                      12,150

Tiebing Guan                             196,226  (19)         196,226  (19)                     -

Jay M. Haft              Chairman      1,532,000  (5)          468,500                   1,063,500  (5)
                          Of The
                         Board and
                         Director

Cy E. Hammond             Senior         394,718  (6)           25,000                     369,718  (6)
                           Vice
                        President,
                           Chief
                         Financial
                          Officer
<PAGE>
John B. Horton            Senior         634,417  (7)           20,000                     614,417  (7)
                           Vice
                        President,
                          General
                        Counsel And
                         Secretary

JeFrob Glorich Ltd.                      215,849  (19)         215,849  (19)                     -

Irene Lebovics            Senior       1,388,067               996,767                     391,300
                           Vice
                         President

John L. Lesher                           105,000                20,000                      85,000

William A. Marquard                       50,000                50,000                           -

John J. McCloy           Director      3,661,591  (8)        3,661,591  (13)                     -

National Utility                         215,849  (19)         215,849  (19)                     -
Services (Canada)
Ltd.

Aldo Nenzi                               392,453  (19)         392,453  (19)                     -

Marjorie Oolie              (3)          200,000               200,000                           -

Sam Oolie                Director        565,000  (9)          550,000                      15,000

Oolie Enterprises           (3)           21,280                21,280                           -

Oolie Family Support        (3)           10,000                10,000                           -
Foundation

Optimum Fund                             588,679  (19)         588,679  (19)                     -

Michael J. Parrella      President     4,250,333  (10)       1,125,833                   3,124,500  (10)
                            And
                         Director

Primecap Management                      588,679  (19)         588,679  (19)                     -
Group

Rossmore Enterprises                      98,113  (19)          98,113  (19)                     -
Money Purchase

Sage Capital                              98,113  (19)          98,113  (19)                     -
Investments Limited

Carole Salkind              (4)        9,542,143             6,857,143  (14)             2,685,000

Seagrove, Inc.                            49,057  (19)          49,057  (19)                     -

The Second Cup, Ltd.                     392,453  (19)         392,453  (19)                     -

Karen D. Seeman                           49,057  (19)          49,057  (19)                     -

Selday Investments                       196,226  (19)         196,226  (19)                     -
LTD

Silenus Limited                        1,962,264  (19)       1,962,264  (15)(19)                 -
                                  
Philip Santo                             196,226  (19)         196,226  (19)                     -
Sirianni, TTEE, The
Sirianni-Jersey Trust

Sovereign Partners,                    3,433,962  (19)       3,433,962  (16)(19)                 -
LP                            

Jay Smith                                392,453  (19)         392,453  (19)                     -

Thomson Kernaghan &                    2,747,170  (19)       2,747,170  (17)(19)                 -
Co. Ltd.                                       

Rolf Towe                                150,000               150,000                           -

Tricaster                                294,340  (19)         294,340  (19)                     -
Management, Inc.

Verity Group, plc                      3,850,000             3,850,000  (18)                     -

Luc Verschueren                           25,000                25,000                           -

Eldon W. Ziegler, Jr.                    145,250               125,000                      20,250

Zooley Services                          196,226  (19)         196,226  (19)                     -
Limited
                                      ----------            ----------                   ---------
                                      54,887,371            44,982,363                   9,905,008
                                      ==========            ==========                   =========
</TABLE>

- -----------------------------

(1)  Includes  shares  issuable  upon  exercise  of  non-contingent,   currently
     outstanding  options  and  warrants.  The table does not include any shares
     held in Alexander, Wescott & Co., Inc.'s or First Atlanta Securities, LLC's
     trading  accounts or any  customer  account  over which  either of them has
     discretion.

(2)  Represents  a person who was either an officer or a director of the Company
     within three years of the date hereof or an affiliate thereof.

(3)  An affiliate of Sam Oolie, a director of the Company.

(4)  The wife of Morton Salkind, a director of the Company.

(5)  Includes  250,000 shares  issuable upon  contingent  currently  outstanding
     options.

(6)  Includes  75,000 shares  issuable  upon  contingent  currently  outstanding
     options.

(7)  Includes  75,000 shares  issuable  upon  contingent  currently  outstanding
     options.

(8)  Includes  50,000 shares  issuable  upon  contingent  currently  outstanding
     options.

(9)  Includes  50,000 shares  issuable  upon  contingent  currently  outstanding
     options.

(10) Includes  1,500,000 shares issuable upon contingent  currently  outstanding
     options.

(11) Upon  completion of the offering the Selling  Stockholder  will own 1.2% of
     the Company's issued and outstanding Common Stock.

(12) Upon  completion of the offering the Selling  Stockholder  will own 2.8% of
     the Company's issued and outstanding Common Stock.

(13) Upon  completion of the offering the Selling  Stockholder  will own 2.1% of
     the Company's issued and outstanding Common Stock.

(14) Upon  completion of the offering the Selling  Stockholder  will own 3.9% of
     the Company's issued and outstanding Common Stock.

(15) Upon  completion of the offering the Selling  Stockholder  will own 1.1% of
     the Company's issued and outstanding Common Stock.

(16) Upon  completion of the offering the Selling  Stockholder  will own 1.9% of
     the Company's issued and outstanding Common Stock.

(17) Upon  completion of the offering the Selling  Stockholder  will own 1.5% of
     the Company's issued and outstanding Common Stock.

(18) Upon  completion of the offering the Selling  Stockholder  will own 2.2% of
     the Company's issued and outstanding Common Stock.

(19) Based on each Selling Stockholder's pro rata share of the maximum number of
     shares of Common  Stock  which  the  Company  is  obligated  to issue  upon
     conversion of the Preferred Stock under the Subscription  Agreements.  Such
     pro rata share has been determined for each Selling Stockholder by dividing
     the  number  of  shares  of  Preferred   Stock  acquired  by  such  Selling
     Stockholder by the total number of shares of Preferred  Stock issued in the
     1997 Preferred Stock Private  Placement.  The number of shares of Preferred
     Stock issued upon conversion to any particular  Selling  Stockholder may be
     more or less than the amount shown  depending on (i) the length of time the
     Preferred Stock is held, (ii) the conversion  price as determined under the
     Conversion Formula, and (iii) the application of the 26,000,000 share limit
     on the Company's obligation to issue shares of Common Stock upon conversion
     of the Preferred Stock.




<PAGE>


                          PLAN OF DISTRIBUTION

   The Company has been  advised by the Selling  Stockholders  that there are no
underwriting  arrangements  with  respect to the sale of the  shares,  that such
shares  will be sold from time to time in public  sales in the  over-the-counter
market at then prevailing prices or at prices related to the then current market
price or in private transactions at negotiated prices. The shares offered hereby
may be sold by one or more of the following methods,  without limitation:  (a) a
block  trade in which a broker or dealer so  engaged  will  attempt  to sell the
shares as agent but may  position and resell a portion of the block as principal
to facilitate the transaction;  (b) purchases by a broker or dealer as principal
and resale by such broker or dealer for its account pursuant to this Prospectus;
(c)  ordinary  brokerage  transactions  and  transactions  in which  the  broker
solicits  purchasers;  and (d)  face-to-face  transactions  between  sellers and
purchasers  without a  broker-dealer.  In  effecting  sales,  brokers or dealers
engaged by the Selling  Stockholders may arrange for other brokers or dealers to
participate.  Such broker or dealers may receive  commissions  or discounts from
Selling  Stockholders in amounts to be negotiated.  Such brokers and dealers and
any other  participating  brokers or dealers may be deemed to be  "underwriters"
within the meaning of the Act, in connection  with such sales.  Shares of Common
Stock  offered  hereby  may be  used to  cover  short  sales  or  other  hedging
transactions.  From time to time, one or more of the Selling  Stockholders named
herein may pledge,  hypothecate  or grant a security  interest in some or all of
the Shares owned by them, and the pledgees,  secured  parties or persons to whom
such securities have been  hypothecated  shall, upon foreclosure in the event of
default, be deemed to be Selling Stockholders for purposes hereof.




<PAGE>


                             LEGAL MATTERS

   Matters  relating to the legality of 40,470,536  shares of Common Stock being
offered by this  Prospectus  have been  passed  upon for the  Company by John B.
Horton, Esquire, Senior Vice President and General Counsel of the Company. As of
December 19, 1997,  Mr. Horton owned 20,000  shares of Common Stock,  subject to
acquisition upon the exercise of currently exercisable  warrants,  20,000 shares
of which are being  offered by this  Prospectus.  In addition,  Mr.  Horton owns
539,417 shares subject to acquisition upon the exercise of currently exercisable
options  granted  to him under the 1992 Plan none of which are being  offered by
this  Prospectus.  Matters  relating to the legality of the remaining  4,890,721
shares of Common Stock offered by this  Prospectus have been passed upon for the
Company by Parker Duryee Rosoff & Haft, a  professional  corporation,  New York,
New York.  Jay M. Haft,  a former  member of and  presently of counsel to Parker
Duryee  Rosoff & Haft,  is Chairman of the Board of Directors  and a director of
the Company and is the  beneficial  owner of 1,532,000  shares of Common  Stock,
including 1,282,000 shares subject to acquisition upon the exercise of currently
exercisable  warrants and options,  468,500 shares of which are being offered by
this Prospectus.


                                EXPERTS

   The consolidated financial statements of the Company at December 31, 1996 and
1995 and for the  years  ended  December  31,  1994,  1995 and 1996 the  related
financial  statement schedule  incorporated into this prospectus by reference to
the Company's  Annual Report on Form 10-K for the fiscal year ended December 31,
1996,  as amended by Amendment  Nos. 1 and 2 thereto on the  Company's  two Form
10K/A's  filed  respectively  on April 21,  1997 and  April  30,  1997 have been
audited by Richard A. Eisner & Company,  LLP, Independent Auditors, as set forth
in their reports  included  therein  (which  contains an  explanatory  paragraph
relating to the Company's possible inability to continue as a going concern) and
have been so incorporated in reliance upon such reports given upon the authority
of such firm as experts in auditing and accounting.




<PAGE>


                                   PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.    Other Expenses of Issuance and Distribution

      The  following  table sets  forth the  estimated  expenses  payable by the
registrant  with  respect  to  the  offering   described  in  this  Registration
Statement:

Securities and Exchange Commission  registration fee       $10,429
Legal Fees and expenses                                     12,000 *
Accounting fees and expenses                                15,000 *
Miscellaneous expenses                                         500 *
                                                      ------------
Total                                                      $37,929 *
                                                      ============
- -------------
* Estimated

Item 15.    Indemnification of Directors and Officers

Article IX of the Registrant's Certificate of Incorporation provides as follows:

            "(a) Each person who was or is made a party or is  threatened  to be
      made a party to or is involved in any action, suit or proceeding,  whether
      civil,   criminal,   administrative   or   investigative   (hereinafter  a
      "proceeding"),  by reason of the fact that he or she,  or a person of whom
      he or she is the legal representative, is or was a director or officer, of
      the  Corporation or is or was serving at the request of the Corporation as
      a  director,  officer,  employee or agent of another  corporation  or of a
      partnership,  joint venture, trust or other enterprise,  including service
      with  respect  to  employee  benefit  plans,  whether  the  basis  of such
      proceeding  is  alleged  action in an  official  capacity  as a  director,
      officer,  employee or agent or in any other  capacity  while  serving as a
      director,  officer,  employee  or  agent,  shall be  indemnified  and held
      harmless  by the  Corporation  to the  fullest  extent  authorized  by the
      Delaware  General  Corporation Law, as the same exists or may hereafter be
      amended  (but, in the case of any such  amendment  only to the extent that
      such amendment permits the Corporation to provide broader  indemnification
      rights than said law  permitted the  Corporation  to provide prior to such
      amendment),  against all expense, liability and loss (including attorneys'
      fees,  judgments,  fines, ERISA excise taxes or penalties and amounts paid
      or to be paid in  settlement)  reasonably  incurred  or  suffered  by such
      person in connection therewith and such indemnification  shall continue as
      to a person who has ceased to be a  director,  officer,  employee or agent
      and  shall  inure  to the  benefit  of his or  her  heirs,  executors  and
      administrators;  provided,  however, that, except as provided in paragraph
      (b) hereof,  the  Corporation  shall  indemnify  any such  person  seeking
      indemnification   in  connection  with  a  proceeding  (or  part  thereof)
      initiated  by such person only if such  proceeding  (or part  thereof) was
      authorized  by the Board of  Directors  of the  Corporation.  The right to
      indemnification  conferred in this Section  shall be a contract  right and
      shall  include  the  right  to be paid  by the  Corporation  the  expenses
      incurred  in  defending  any  such  proceeding  in  advance  of its  final
      disposition;  provided, however, that, if the Delaware General Corporation
      Law  requires,  the  payment of such  expenses  incurred  by a director or
      officer in his or her  capacity as a director  or officer  (and not in any
      other  capacity in which service was or is rendered by such person while a
      director or officer, including, without limitation, service to an employee
      benefit plan) in advance of the final  disposition of a proceeding,  shall
      be made only upon delivery to the Corporation of an undertaking,  by or on
      behalf of such director or officer, to repay all amounts so advanced if it
      shall  ultimately  be  determined  that such  director  or  officer is not
      entitled  to  be  indemnified   under  this  Section  or  otherwise.   The
      Corporation   may,   by  action  of  its  Board  of   Directors,   provide
      indemnification  to employees and agents of the Corporation  with the same
      scope  and  effect  as the  foregoing  indemnification  of  directors  and
      officers.

            "(b) If a claim under  paragraph  (a) of this Section is not paid in
      full by the Corporation  within thirty days after a written claim has been
      received by the Corporation, the claimant may at any time thereafter bring
      suit  against the  Corporation  to recover the unpaid  amount of the claim
      and, if successful in whole or in part,  the claimant shall be entitled to
      be paid also the expense of prosecuting  such claim. It shall be a defense
      to any such action  (other  than an action  brought to enforce a claim for
      expenses  incurred in  defending  any  proceeding  in advance of its final
      disposition where the required undertaking,  if any is required,  has been
      tendered to the  Corporation)  that the claimant has not met the standards
      of  conduct  which  make  it  permissible   under  the  Delaware   General
      Corporation  Law for the  Corporation  to  indemnify  the claimant for the
      amount  claimed,  but the burden of proving such  defense  shall be on the
      Corporation.  Neither the failure of the Corporation  (including its Board
      of Directors, independent legal counsel, or its stockholders) to have made
      a   determination   prior  to  the   commencement   of  such  action  that
      indemnification of the claimant is proper in the circumstances  because he
      or she has  met the  applicable  standard  of  conduct  set  forth  in the
      Delaware  General  Corporation  Law,  nor an actual  determination  by the
      Corporation (including its Board of Directors,  independent legal counsel,
      or its  stockholders)  that  the  claimant  has  not met  such  applicable
      standard  or  conduct,  shall  be a  defense  to the  action  or  create a
      presumption  that the  claimant  has not met the  applicable  standard  of
      conduct.

            "(c) The  right  to  indemnification  and the  payment  of  expenses
      incurred in  defending a  proceeding  in advance of its final  disposition
      conferred  in this  Section  shall not be exclusive of any right which any
      person may have or hereafter  acquire under any statute,  provision of the
      Certificate of Incorporation,  by-law,  agreement, vote of stockholders or
      disinterested directors or otherwise.

            "(d) The  Corporation  may maintain  insurance,  at its expense,  to
      protect  itself  and any  director,  officer,  employee  or  agent  of the
      Corporation or another corporation,  partnership,  joint venture, trust or
      other enterprise  against any such expense,  liability or loss, whether or
      not the Corporation  would have the power to indemnify such person against
      such  expense,  liability or loss under the Delaware  General  Corporation
      Law."




<PAGE>


Item 16.    Exhibits (listed  according to the number assigned in the table in
Item 601 of Regulation S-K)

      The  following  exhibits  are  included  as a part  of  this  Registration
Statement:

 Exhibit No.                          Description
      5          Opinion of John B. Horton,  Esquire,  Senior Vice President and
                 General  Counsel of the  registrant,  as to the legality of the
                 Common Stock to which this Registration Statement relates.

    23(a)        Consent of Richard A. Eisner & Company, LLP.

    23(b)        Consent  of John B.  Horton,  Esquire  (contained  in
                 Exhibit 5).

      24         Powers of Attorney (see signature pages).


Item 17.    Undertakings

      The undersigned registrant hereby undertakes:

      (a) (1) To file,  during  any  period  in which  offers or sales are being
made, a post-effective amendment to this registration statement:

            (i)   To include any  prospectus  required by section  10(a)(3) of
                  the Securities Act of 1933;

            (ii)  To  reflect  in the  prospectus  any facts or event  arising
                  after the effective date of the  registration  statement (or
                  the most recent  post-effective  amendment  thereof)  which,
                  individually  or in the  aggregate,  represent a fundamental
                  change  in the  information  set  forth in the  registration
                  statement.  Notwithstanding  the foregoing,  any increase or
                  decrease  in  volume  of  securities  offered  (if the total
                  dollar  value of  securities  offered  would not exceed that
                  which  was  registered)  and any  deviation  from the low or
                  high and of the  estimated  maximum  offering  range  may be
                  reflected  in  the  form  of   prospectus   filed  with  the
                  Commission  pursuant  to Rule  424(b) if, in the  aggregate,
                  the  changes in volume and price  represent  no more than 20
                  percent change in the maximum  aggregate  offering price set
                  forth in the "Calculation of Registration  Fee" table in the
                  effective registration statement.

            (iii) To include any material  information  with respect to the plan
                  of distribution  not previously  disclosed in the registration
                  statement or any material  change to such  information  in the
                  registration statement;

provided,  however,  that the  undertakings  set forth in paragraphs  (1)(i) and
(1)(ii)  above do not apply if the  information  required  to be  included  in a
post-effective  amendment by those  paragraphs is contained in periodic  reports
filed by the  registrant  pursuant  to  Section  13 or  15(d) of the  Securities
Exchange Act of 1934 that are  incorporated  by  reference in this  registration
statement.

            (2) That,  for the purpose of  determining  any liability  under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

            (3)  To  remove  from  registration  by  means  of a  post-effective
amendment  any of the  securities  being  registered  which remain unsold at the
termination of the offering.

      (b) That for purposes of  determining  any liability  under the Securities
Act of 1933, each filing of the  registrant's  annual report pursuant to Section
13(a) or 15(d) of the Securities  Exchange Act of 1934 that is  incorporated  by
reference  in  this  registration   statement  shall  be  deemed  to  be  a  new
registration  statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

      (h)  Insofar  as  indemnification   for  liabilities   arising  under  the
Securities Act of 1933 may be permitted to directors,  officers and  controlling
persons of the registrant  pursuant to the foregoing  provisions,  or otherwise,
the  registrant  has been  advised  that in the  opinion of the  Securities  and
Exchange  Commission such  indemnification is against public policy as expressed
in the Act and is,  therefore,  unenforceable.  In the  event  that a claim  for
indemnification  against  such  liabilities  (other  than  the  payment  by  the
registrant of expenses  incurred or paid by a director,  officer or  controlling
person of the  registrant  in the  successful  defense  of any  action,  suit or
proceeding)  is  asserted by such  director,  officer or  controlling  person in
connection with the securities being registered,  the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.





<PAGE>


                                  SIGNATURES

   Pursuant to the  requirements  of the  Securities Act of 1933, the registrant
certifies  that it has  reasonable  grounds to believe  that it meets all of the
requirements  for  filing  on Form S-3 and has  duly  caused  this  Registration
Statement  to be  signed  on its  behalf  by  the  undersigned,  thereunto  duly
authorized, in Linthicum, Maryland, on this 29th day of December 1997.

                              NOISE CANCELLATION TECHNOLOGIES, INC.


                              By:   /s/ MICHAEL J. PARRELLA
                                    ------------------------------
                                    Michael J. Parrella, President



<PAGE>


   Each of the undersigned  hereby appoints  Michael J. Parrella,  Cy E. Hammond
and John B. Horton, and each of them severally, his true and lawful attorneys to
execute (in the name and on behalf of and as attorneys for the undersigned) this
Registration   Statement  and  any  and  all  amendments  to  this  Registration
Statement,  and to file the same, with all exhibits  thereto and other documents
in connection therewith, with the Securities and Exchange Commission.

   Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed by the following  persons in the capacities and on the
dates indicated.

      Signatures                    Capacity                      Date

/s/ MICHAEL J. PARRELLA    President (Principal Executive    December 29, 1997
- -----------------------    Officer) and Director
Michael J. Parrella        


/s/ CY E. HAMMOND          Senior Vice President and         December 29, 1997
- -----------------------    Chief Financial Officer
Cy E. Hammond              (Principal Financial and
                           Accounting Officer)


/s/ JAY M. HAFT            Chairman of the Board             December 29, 1997
- -----------------------    of Directors and Director
Jay M. Haft           


/s/ JOHN J. McCLOY         Director                          December 29, 1997
- -----------------------
John J. McCloy


/s/ SAM OOLIE              Director                          December 29, 1997
- -----------------------
Sam Oolie


/s/ STEPHAN CARLQUIST      Director                          December 29, 1997
- -----------------------
Stephan Carlquist


/s/ MORTON SALKIND         Director                          December 29, 1997
- -----------------------
Morton Salkind




<PAGE>


                                EXHIBIT INDEX

                                                              Sequential
Exhibit No.             Description                           Page Number

        5         Opinion of John B. Horton, Esquire,             48
                  Senior Vice President and General  
                  Counsel of the  registrant, as  to  
                  the  legality  of  the  Common  Stock  
                  to  which  this Registration 
                  Statement relates.

      23(a)       Consent of Richard A. Eisner & Company, LLP.    49

      23(b)       Consent of John B. Horton, Esquire 
                  (contained in Exhibit 5).

      24          Powers of Attorney (see signature pages).



<PAGE>


                                                                      Exhibit 5

                                December 29, 1997


Noise Cancellation Technologies, Inc.
1025 West Nursery Road, Suite 120
Linthicum, Maryland  21090

      Re:   Registration Statement on Form S-3

Gentlemen:

      Referring   to  the   Registration   Statement  on  Form  S-3  that  Noise
Cancellation  Technologies,  Inc.  (the  "Company")  is  filing  today  with the
Securities and Exchange Commission under the Securities Act of 1933, as amended,
relating to the sale by certain  Selling  Stockholders  of 44,982,363  shares of
Common  Stock of the  Company  (the  "Resale  Shares")  and the sale to  certain
persons not deemed  "affiliates"  of the Company,  as that term is defined under
the Securities Act of 1933, as amended, of 378,894 shares of Common Stock of the
Company upon the exercise of outstanding warrants and options to purchase Common
Stock (the "Warrant and Option Shares"), I am of the opinion that:

1. The Resale Shares have been duly authorized by the Company, have been validly
issued and are fully paid and nonassessable.

2. The Warrant and Option  Shares have been duly  authorized by the Company and,
when issued and delivered in accordance with the terms of the respective warrant
or option agreements governing such warrants or options, will be validly issued,
fully paid and nonassessable.

      I hereby  consent to the filing of this  opinion with the  Securities  and
Exchange  Commission as Exhibit No. 5 to the Registration  Statement referred to
above  and to the  reference  to me under the  caption  "Legal  Matters"  in the
Prospectus.

                                Very truly yours,


                               /s/ JOHN B. HORTON
                               ------------------
                                   John B. Horton
                                   Senior Vice President and
                                   General Counsel



<PAGE>


                                                                 Exhibit 23(a)

                       CONSENT OF INDEPENDENT AUDITORS




We consent to the  incorporation by reference to the  Registration  Statement on
Form S-3 of our report dated  February 28, 1997 (with  respect to Note 15, March
28, 1997,  with respect to Note 8, April 10, 1997, with respect to Note 7, April
18,  1997),  on the  consolidated  financial  statements  and  schedule of Noise
Cancellation  Technologies,  Inc.  (the  "Company")  as at December 31, 1996 and
December 31, 1995 and for the three years ended  December 31, 1996,  included in
the  Company's  Annual  Report on Form 10-K  (including  Amendment  Nos. 1 and 2
thereto) for the year ended  December 31, 1996, and to the reference to us under
the captions  "Going concern  emphasis  paragraph in  accountants'  opinion" and
"Experts" included in the Prospectus.


Richard A. Eisner & Company, LLP
New York, New York
December 22, 1997




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