www.pudn.com > g729_audio_encode.rar > tab_dtx.c

/* 
   ITU-T G.729 Annex B     ANSI-C Source Code 
   Version 1.3    Last modified: August 1997 
 
   Copyright (c) 1996, France Telecom, Rockwell International, 
                       Universite de Sherbrooke. 
   All rights reserved. 
*/ 
 
/*********************************************************************/ 
/******             Tables used for VAD/DTX/CNG                 ******/ 
/*********************************************************************/ 
#include  
 
#include "typedef.h" 
#include "ld8k.h" 
#include "vad.h" 
#include "dtx.h" 
#include "tab_dtx.h" 
 
/* VAD constants */ 
Word16 lbf_corr[NP+1] = { 
  7869, 7011, 4838, 2299, 321, -660, -782, -484, -164, 3, 39, 21, 4}; 
Word16 shift_fx[33] = {0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 
                         2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 5,0}; 
Word16 factor_fx[33] = {32767, 16913, 17476, 18079, 18725, 19418, 
                          20165, 20972, 21845, 22795, 23831, 24966, 
                          26214, 27594, 29127, 30840, 32767, 17476, 
                          18725, 20165, 21845, 23831, 26214, 29127, 
                          32767, 18725, 21845, 26214, 32767, 21845, 
                          32767, 32767,0}; 
 
/* Quantization of SID gain */ 
Word16 fact[NB_GAIN+1] = {410, 26, 13}; 
Word16 marg[NB_GAIN+1] = {0, 0, 1}; 
Word16 tab_Sidgain[32] = { 
    2,    5,    8,   13,   20,   32,   50,   64, 
   80,  101,  127,  160,  201,  253,  318,  401, 
  505,  635,  800, 1007, 1268, 1596, 2010, 2530, 
 3185, 4009, 5048, 6355, 8000,10071,12679,15962 }; 
 
/* Quantization of LSF vector */ 
Word16 noise_fg[MODE][MA_NP][M]; 
 
Word16 noise_fg_sum[MODE][M] = { 
  {7798, 8447, 8205, 8293, 8126, 8477, 8447, 8703, 9043, 8604}, 
  {10514, 12402, 12833, 11914, 11447, 11670, 11132, 11311, 11844, 11447} 
}; 
 
Word16 noise_fg_sum_inv[MODE][M] = { 
  {17210, 15888, 16357, 16183, 16516, 15833, 15888, 15421, 14840, 15597}, 
  {12764, 10821, 10458, 11264, 11724, 11500, 12056, 11865, 11331, 11724} 
}; 
 
Word16 PtrTab_1[32] = {96,52,20,54,86,114,82,68,36,121,48,92,18,120, 
                         94,124,50,125,4,100,28,76,12,117,81,22,90,116, 
                         127,21,108,66}; 
Word16 PtrTab_2[2][16]= {{31,21,9,3,10,2,19,26,4,3,11,29,15,27,21,12}, 
                           {16,1,0,0,8,25,22,20,19,23,20,31,4,31,20,31}}; 
 
Word16 Mp[MODE] = {8644, 16572};