Category

Development Platform
Home > SourceCode/Document > Communication-Mobile > Voice Compress > View Code
vdecode.c
Package: celp32c.rar　[view]
Upload User: tsjrly
Upload Date: 2021-02-19
Package Size: 107k
Code Size: 1k
Category:

Voice Compress

Development Platform:

C/C++

vdecode.c：Code Content
  1. /**************************************************************************
  2. *
  3. * ROUTINE
  4. * vdecode
  5. *
  6. * FUNCTION
  7. *
  8. * create excitation vector from code book index and decoded gain
  9. *
  10. * SYNOPSIS
  11. * subroutine vdecode(decodedgain, l, vdecoded)
  12. *
  13. *   formal
  14. *
  15. *                       data    I/O
  16. *       name            type    type    function
  17. *       -------------------------------------------------------------------
  18. * decodedgain r i decoded gain value
  19. * l i i pitch&code frame length
  20. * vdecoded r o decoded excitation array
  21. *
  22. *   external
  23. *                       data    I/O
  24. *       name            type    type    function
  25. *       -------------------------------------------------------------------
  26. *       x[] float i
  27. *
  28. ***************************************************************************
  29. *
  30. * CALLED BY
  31. *
  32. *       celp
  33. *
  34. * CALLS
  35. *
  36. *
  37. *
  38. **************************************************************************/
  39. #include "ccsub.h"
  40. extern int cbindex, frame;
  41. extern float x[MAXCODE];
  43. vdecode(decodedgain, l, vdecoded)
  44. int l;
  45. float decodedgain, vdecoded[];
  47. {
  48.   int i, codeword;
  50.   /* *copy selected vector to excitation array      */
  52.   codeword = 2 * (MAXNCSIZE - cbindex);
  53.   if (codeword < 0)
  54.   {
  55.     printf("vdecode: cbindex > MAXNCSIZE at frame %dn", frame);
  56.     codeword = 0;
  57.   }
  58.   for (i = 0; i < l; i++)
  59.     vdecoded[i] = x[i + codeword] * decodedgain;
  60. }