ltp_cortexm3.h

基于 STM32 PCM语音编/解码代码

#ifndef __LTP_M3_H
#define __LTP_M3_H


#define OVERRIDE_COMPUTE_PITCH_ERROR
#define OVERRIDE_PITCH_GAIN_SEARCH_3TAP_VQ
int pitch_gain_search_3tap_vq(
  const signed char *gain_cdbk,
  int                gain_cdbk_size,
  spx_word16_t      *C16,
  spx_word16_t       max_gain
)
{
  int                best_cdbk=0;
  spx_word32_t       best_sum=-VERY_LARGE32;

  int                i;


spx_word16_t g_0[32]={
0, 1, -9, -24, 
19, 28, -9, 24, 
33, 10, -6, 11, 
32, -21, -5, 13, 
38, -1, -8, 15,
1, 9, -11, -2, 
16, 18, 1, 11,
-15, -14, 4, 22};

spx_word16_t g_1[32]={
0, -26, 8, 10, 
65, -7, 47, 17, 
34, -34, 60, 46, 
53, -39, 31, 27, 
97, -16, 89, 36, 
70, 60, 61, 45, 
47, -50, 57, 37, 
-31, 44, 15, 46};

spx_word16_t g_2[32]={
0, 16, -11, -23, 
-9, 23, 20, 20, 
-12, -10, 9, -5, 
-18, 5, 13, 4, 
-12, -1, 18, -13, 
-1, -8, 20, 9, 
5, 17, 0, 27, 
-19, 35, 3, -8};

spx_word16_t gain_sum[32]={
0, 22, 14, 29, 
47, 29, 38, 31, 
40, 27, 38, 31, 
52, 33, 25, 22, 
74, 9, 58, 32, 
36, 39, 46, 28, 
34, 43, 29, 38, 
33, 47, 11, 38};

  for (i=0;i<32;i++) 
  {
    
	spx_word32_t sum = 0;     
         
    sum = ADD32(sum,MULT16_16(MULT16_16_16(g_0[i],64),C16[0]));
    sum = ADD32(sum,MULT16_16(MULT16_16_16(g_1[i],64),C16[1]));
    sum = ADD32(sum,MULT16_16(MULT16_16_16(g_2[i],64),C16[2]));
    sum = SUB32(sum,MULT16_16(MULT16_16_16(g_0[i],g_1[i]),C16[3]));
    sum = SUB32(sum,MULT16_16(MULT16_16_16(g_2[i],g_1[i]),C16[4]));
    sum = SUB32(sum,MULT16_16(MULT16_16_16(g_2[i],g_0[i]),C16[5]));
    sum = SUB32(sum,MULT16_16(MULT16_16_16(g_0[i],g_0[i]),C16[6]));
    sum = SUB32(sum,MULT16_16(MULT16_16_16(g_1[i],g_1[i]),C16[7]));
    sum = SUB32(sum,MULT16_16(MULT16_16_16(g_2[i],g_2[i]),C16[8]));
         
    if (sum>best_sum && gain_sum[i]<=max_gain) {
      best_sum=sum;
      best_cdbk=i;
    }
  }

  return best_cdbk;
}


#endif