UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 1)*


                         APPLIED SIGNAL TECHNOLOGY, INC.
-------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
-------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    038237103
                                    ---------
                                 (CUSIP Number)

                                December 31, 2005
                                -----------------
                      (Date of Event which Requires Filing
                               of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [  ]      Rule 13d-1(b)
                  [X ]      Rule 13d-1(c)
                  [  ]      Rule 13d-1(d)



  *The remainder of this cover page shall be filled out for a reporting person's
  initial filing on this form with respect to the subject class of securities,
  and for any subsequent amendment containing information which would alter the
  disclosures provided in a prior cover page.

  The information required on the remainder of this cover page shall not be
  deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
  Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
  the Act but shall be subject to all other provisions of the Act (however, see
  the Notes).


                                  Page 1 of 8




CUSIP No. 038237103                    13G                    Page 2 of 8 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     S.A.C. Capital Advisors, LLC

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          5,494 (see Item 4)
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            5,494 (see Item 4)
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     5,494 (see Item 4)

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 0.1% (see Item 4)

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     00

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT


                                  Page 2 of 8




CUSIP No. 038237103                    13G                    Page 3 of 8 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     S.A.C. Capital Management, LLC

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     Delaware

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          5,494 (see Item 4)
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            5,494 (see Item 4)
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     5,494 (see Item 4)

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 0.1% (see Item 4)

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     00

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT


                                  Page 3 of 8




CUSIP No. 038237103                    13G                    Page 4 of 8 Pages


________________________________________________________________________________
1.   NAME OF REPORTING PERSONS
     I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

     Steven A. Cohen

________________________________________________________________________________
2.   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                 (a)  [_]
                                                                 (b)  [X]

________________________________________________________________________________
3.   SEC USE ONLY



________________________________________________________________________________
4.   CITIZENSHIP OR PLACE OF ORGANIZATION

     United States

________________________________________________________________________________
  NUMBER OF    5.   SOLE VOTING POWER

   SHARES           0
               _________________________________________________________________
BENEFICIALLY   6.   SHARED VOTING POWER

  OWNED BY          5,494 (see Item 4)
               _________________________________________________________________
    EACH       7.   SOLE DISPOSITIVE POWER

  REPORTING         0
               _________________________________________________________________
   PERSON      8.   SHARED DISPOSITIVE POWER

    WITH            5,494 (see Item 4)
________________________________________________________________________________
9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     5,494 (see Item 4)

________________________________________________________________________________
10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [_]

________________________________________________________________________________
11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 0.1% (see Item 4)

________________________________________________________________________________
12.  TYPE OF REPORTING PERSON*

     IN

________________________________________________________________________________
                     *SEE INSTRUCTIONS BEFORE FILLING OUT


                                  Page 4 of 8




ITEM 1(A)               NAME OF ISSUER:

                        Applied Signal Technology, Inc.

ITEM 1(B)               ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                        400 West California Avenue
                        Sunnyvale, CA 94086

ITEMS 2(A)              NAME OF PERSON FILING:

                        This statement is filed by: (i) S.A.C. Capital Advisors,
                        LLC, ("SAC Capital Advisors") with respect to shares of
                        common stock ("Shares") of the Issuer beneficially owned
                        by S.A.C. MultiQuant Fund, LLC ("SAC MultiQuant"); (ii)
                        S.A.C. Capital Management, LLC, ("SAC Capital
                        Management") with respect to Shares beneficially owned
                        by SAC MultiQuant; and (iii) Steven A. Cohen with
                        respect to Shares beneficially owned by SAC Capital
                        Advisors, SAC Capital Management and SAC MultiQuant.

ITEM 2(B)               ADDRESS OF PRINCIPAL BUSINESS OFFICE:

                        The address of the principal business office of (i) SAC
                        Capital Advisors and Mr. Cohen is 72 Cummings Point
                        Road, Stamford, Connecticut 06902 and (ii) SAC Capital
                        Management is 540 Madison Avenue, New York, New York
                        10022.

ITEM 2(C)               CITIZENSHIP:

                        SAC Capital Advisors and SAC Capital Management are
                        Delaware limited liability companies. Mr. Cohen is a
                        United States citizen.

ITEM 2(D)               TITLE OF CLASS OF SECURITIES:

                        Common Stock

ITEM 2(E)               CUSIP NUMBER:

                        038237103

ITEM 3                  Not Applicable


                                  Page 5 of 8




ITEM 4              OWNERSHIP:

                   The percentages used herein are calculated based upon the
                   Shares issued and outstanding as of October 31, 2005 as
                   reported on the Issuer's annual report on Form 10-K filed
                   with the Securities and Exchange Commission by the Issuer
                   for the fiscal year ended October 31, 2005.

                   As of the close of business on December 30, 2005:

                   1. S.A.C. Capital Advisors, LLC
                   (a) Amount beneficially owned: 5,494
                   (b) Percent of class: Less than 0.1%
                   (c)(i) Sole power to vote or direct the vote: -0-
                   (ii) Shared power to vote or direct the vote: 5,494
                   (iii) Sole power to dispose or direct the disposition: -0-
                   (iv) Shared power to dispose or direct the disposition: 5,494

                   2. S.A.C. Capital Management, LLC
                   (a) Amount beneficially owned: 5,494
                   (b) Percent of class: Less than 0.1%
                   (c)(i) Sole power to vote or direct the vote: -0-
                   (ii) Shared power to vote or direct the vote: 5,494
                   (iii) Sole power to dispose or direct the disposition: -0-
                   (iv) Shared power to dispose or direct the disposition: 5,494

                   3. Steven A. Cohen
                   (a) Amount beneficially owned: 5,494
                   (b) Percent of class: Less than 0.1%
                   (c)(i) Sole power to vote or direct the vote: -0-
                   (ii) Shared power to vote or direct the vote: 5,494
                   (iii) Sole power to dispose or direct the disposition: -0-
                   (iv) Shared power to dispose or direct the disposition: 5,494

                   SAC Capital Advisors, SAC Capital Management and Mr. Cohen
                   own directly no shares of Common Stock. Pursuant to
                   investment agreements, each of SAC Capital Advisors and SAC
                   Capital Management share all investment and voting power with
                   respect to the securities held by SAC MultiQuant. Mr. Cohen
                   controls each of SAC Capital Advisors, and SAC Capital
                   Management. By reason of the provisions of Rule 13d-3 of the
                   Securities Exchange Act of 1934, as amended, each of SAC
                   Capital Advisors, SAC Capital Management and Mr. Cohen may be
                   deemed to own beneficially 5,494 Shares (constituting
                   approximately less than 0.1% of the Shares outstanding). Each
                   of SAC Capital Advisors, SAC Capital Management and Mr. Cohen
                   disclaim beneficial ownership of any of the securities
                   covered by this statement.

                                  Page 6 of 8




ITEM 5             OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

                   If this statement is being filed to report the fact that as
                   of the date hereof the reporting person has ceased to be the
                   beneficial owner of more than five percent of the class of
                   securities, check the following. [X]

ITEM 6             OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                   PERSON:

                   Not Applicable

ITEM 7             IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                   ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
                   COMPANY:

                   Not Applicable

ITEM 8             IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

                   Not Applicable

ITEM 9             NOTICE OF DISSOLUTION OF GROUP:

                   Not Applicable

ITEM 10            CERTIFICATION:

         By signing below the signatory certifies that, to the best of his
knowledge and belief, the securities referred to above were not acquired and are
not held for the purpose of or with the effect of changing or influencing the
control of the issuer of the securities and were not acquired and are not held
in connection with or as a participant in any transaction having that purpose or
effect.


                                  Page 7 of 8




                                    SIGNATURE

         After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


Dated:  February 14, 2006

S.A.C. CAPITAL ADVISORS, LLC


By: /s/ Peter Nussbaum
   ________________________________________
Name:  Peter Nussbaum
Title: Authorized Person


S.A.C. CAPITAL MANAGEMENT, LLC


By: /s/ Peter Nussbaum
   ________________________________________
Name:  Peter Nussbaum
Title: Authorized Person


STEVEN A. COHEN


By: /s/ Peter Nussbaum
   ________________________________________
Name:  Peter Nussbaum
Title: Authorized Person




                                  Page 8 of 8