Exhibit 4(f)

                                  SECRETARY'S CERTIFICATE

      The  undersigned  being the duly  elected  and acting  Secretary  of Noise
Cancellation  Technologies,  Inc. (the "Company") hereby certifies that attached
hereto as  Exhibit A is a true and  correct  copy of  certain  resolutions  (the
"Resolutions")  unanimously  adopted by the Board of Directors of the Company on
January 22, 1997,  and that the  Resolutions  have not been  modified,  amended,
revoked or rescinded and remain in full force and effect as of the date hereof.

      The  undersigned  hereby  further  certifies that at the Annual Meeting of
Stockholders  of the  Company  duly  held on June  19,  1997,  the  stockholders
approved the extension of the expiration  dates of the warrants held by officers
and directors of the Company  authorized by the Resolutions and that such action
by the stockholders on June 19, 1997, has not been modified, amended, revoked or
rescinded and remains in full force and effect on the date hereof.

                                    /s/ JOHN B. HORTON
                                    -------------------------
                                    John B. Horton, Secretary



<PAGE>


                                         Exhibit A


            RESOLVED,  that the termination or expiration  dates of the warrants
      to purchase common stock of the Corporation  previously granted to certain
      present and former  members of the Board of Directors,  officers and other
      employees of the  Corporation  described in Schedule A attached hereto be,
      and the same hereby are,  extended  for an  additional  two years from the
      original date of termination  or expiration  thereof and that the approval
      of the  stockholders of the Corporation of such extensions to the warrants
      held by present  members of the Board of  Directors  and  officers  of the
      Corporation be obtained at the next Annual Meeting of  Stockholders in the
      event that the  common  stock of the  Corporation  is listed on the Nasdaq
      Stock Market on the date such extension takes effect which shall be deemed
      to be the  termination  or  expiration  date of the warrant as  originally
      granted  and in the  event  it is  likely  that  the  common  stock of the
      Corporation will be so listed on the date of such Annual Meeting; and

            RESOLVED,  that  the  shares  of  common  stock  of the  Corporation
      reserved for  issuance  upon the  exercise of the  foregoing  warrants and
      options  be, and the same hereby are,  continued  to be reserved  for such
      issuance  during  the  two  year  extension  period  provided  for  in the
      foregoing resolutions; and

            RESOLVED,  that the appropriate  officers of the Corporation be, and
      each of  them  with  full  power  to act  without  the  others  hereby  is
      authorized  to take any and all actions  which they may deem  necessary or
      advisable  (as  conclusively  presumed  from the taking of such action) in
      order to carry out the intent and purpose of the foregoing resolutions.





<PAGE>


                             Schedule A


--------------------------------------------------------------------------------
                                                            Old         New
                Exercise                                 Expiration  Expiration
 Warrant No.     Price          Name             Shares     Date        Date
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-1-R           $0.75   John J. McCloy II       862,500  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-2-R           $0.75   Michael J. Parrella     862,500  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-3             $0.75   Graydon F. Vadas        175,000  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-4-R           $0.75   Irene Lebovics          201,250  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-6             $0.75   Eldon W. Ziegler        125,000  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-7             $0.75   Rolf Towe               150,000  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-9-R and       $0.75   Jay M. Haft             218,500  12/31/97    12/31/99
BW-46-R
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-12            $0.75   John W. Gardner          25,500  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-19            $0.75   Randy L. Yingling         8,925  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-31            $0.75   Roy H. Scott             12,660  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-35            $0.75   Kelly Ann Meier           2,230  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-39            $0.75   Robert L. Monroe          2,975  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-40            $0.75   Paul Moore                2,083  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-41            $0.75   Cy E. Hammond            25,000  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-43            $0.75   Lelia C. Dobandi            300  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-44            $0.75   Luc G. Verschueren       25,000  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
BW-45            $0.75   William W. Gerecke       35,000  12/31/97    12/31/99
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------