TMS320C54x COFF Assembler       Beta Version 1.16     Thu Sep 19 17:45:45 1996
Copyright (c) 1996        Texas Instruments Incorporated 

idct.asm                                                             PAGE    1

       1            ***************************************************************
       2            *      (C)  COPYRIGHT TEXAS INSTRUMENTS, INC. 1996            *
       3            ***************************************************************
       4            *  FILE NAME:  IDCT.ASM                                       *
       5            *                                                             *
       6            *  HISTORY:  This program is originally written in TMS320C5x  *
       7            *            assembly language by Braganti Herve of Texas     *
       8            *            Instruments, Inc.                                *
       9            *                                                             *
      10            *  TRANSLATORS:  Rushani Wirasinghe                           *
      11            *                Xiaozhen Zhang                               *
      12            *                Simon Lau                                    *
      13            *                                                             *
      14            *  DESCRIPTION:                                               *
      15            *  -  Inverse Discrete Cosine Transform (IDCT) algorithm.     *
      16            *  -  Code written in TMS320C54x assembly language.           *
      17            *  -  Files:  idct.asm      (This file)                       *
      18            *             idct.cmd      (Linker Command File)             *
      19            *                                                             *
      20            *  LAST DAY MODIFIED:  August 23, 1996                        *
      21            ***************************************************************
      22            *                  +----------------------------------------+             
      23            *                  !              INVERSE                   !             
      24            *                  !    8*8  Discrete Cosinus Transform     !             
      25            *                  !                                        !             
      26            *                  ! Implementation on TMS320C54X assembler !
      27            *                  !                                        !             
      28            *                  !   1440 CYCLES WITHOUT INPUT/OUTPUT SUB-!             
      29            *                  !   ROUTINE                              !             
      30            *                  +----------------------------------------+             
      31            *
      32            *
      33            *   THEORY:
      34            *   
      35            *
      36            *      for a two-dimensional form the IDCT can be described as:
      37            *
      38            *
      39            *                           N-1 N-1
      40            *   x(k,l)=  (2/N)