?? vad.c
字號(hào):
/*
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.
*/
#include <stdio.h>
#include "typedef.h"
#include "ld8k.h"
#include "basic_op.h"
#include "oper_32b.h"
#include "tab_ld8k.h"
#include "vad.h"
#include "dtx.h"
#include "tab_dtx.h"
/* Local functions */
static Word16 MakeDec(
Word16 dSLE, /* (i) : differential low band energy */
Word16 dSE, /* (i) : differential full band energy */
Word16 SD, /* (i) : differential spectral distortion */
Word16 dSZC /* (i) : differential zero crossing rate */
);
/* static variables */
static Word16 MeanLSF[M];
static Word16 Min_buffer[16];
static Word16 Prev_Min, Next_Min, Min;
static Word16 MeanE, MeanSE, MeanSLE, MeanSZC;
static Word16 prev_energy;
static Word16 count_sil, count_update, count_ext;
static Word16 flag, v_flag, less_count;
/*---------------------------------------------------------------------------*
* Function vad_init *
* ~~~~~~~~~~~~~~~~~~ *
* *
* -> Initialization of variables for voice activity detection *
* *
*---------------------------------------------------------------------------*/
void vad_init(void)
{
/* Static vectors to zero */
Set_zero(MeanLSF, M);
/* Initialize VAD parameters */
MeanSE = 0;
MeanSLE = 0;
MeanE = 0;
MeanSZC = 0;
count_sil = 0;
count_update = 0;
count_ext = 0;
less_count = 0;
flag = 1;
Min = MAX_16;
}
/*-----------------------------------------------------------------*
* Functions vad *
* ~~~ *
* Input: *
* rc : reflection coefficient *
* lsf[] : unquantized lsf vector *
* r_h[] : upper 16-bits of the autocorrelation vector *
* r_l[] : lower 16-bits of the autocorrelation vector *
* exp_R0 : exponent of the autocorrelation vector *
* sigpp[] : preprocessed input signal *
* frm_count : frame counter *
* prev_marker : VAD decision of the last frame *
* pprev_marker : VAD decision of the frame before last frame *
* *
* Output: *
* *
* marker : VAD decision of the current frame *
* *
*-----------------------------------------------------------------*/
void vad(
Word16 rc,
Word16 *lsf,
Word16 *r_h,
Word16 *r_l,
Word16 exp_R0,
Word16 *sigpp,
Word16 frm_count,
Word16 prev_marker,
Word16 pprev_marker,
Word16 *marker)
{
/* scalar */
Word32 acc0;
Word16 i, j, exp, frac;
Word16 ENERGY, ENERGY_low, SD, ZC, dSE, dSLE, dSZC;
Word16 COEF, C_COEF, COEFZC, C_COEFZC, COEFSD, C_COEFSD;
/* compute the frame energy */
acc0 = L_Comp(r_h[0], r_l[0]);
Log2(acc0, &exp, &frac);
acc0 = Mpy_32_16(exp, frac, 9864);
i = sub(exp_R0, 1);
i = sub(i, 1);
acc0 = L_mac(acc0, 9864, i);
acc0 = L_shl(acc0, 11);
ENERGY = extract_h(acc0);
ENERGY = sub(ENERGY, 4875);
/* compute the low band energy */
acc0 = 0;
for (i=1; i<=NP; i++)
acc0 = L_mac(acc0, r_h[i], lbf_corr[i]);
acc0 = L_shl(acc0, 1);
acc0 = L_mac(acc0, r_h[0], lbf_corr[0]);
Log2(acc0, &exp, &frac);
acc0 = Mpy_32_16(exp, frac, 9864);
i = sub(exp_R0, 1);
i = sub(i, 1);
acc0 = L_mac(acc0, 9864, i);
acc0 = L_shl(acc0, 11);
ENERGY_low = extract_h(acc0);
ENERGY_low = sub(ENERGY_low, 4875);
/* compute SD */
acc0 = 0;
for (i=0; i<M; i++){
j = sub(lsf[i], MeanLSF[i]);
acc0 = L_mac(acc0, j, j);
}
SD = extract_h(acc0); /* Q15 */
/* compute # zero crossing */
ZC = 0;
for (i=ZC_START+1; i<=ZC_END; i++)
if (mult(sigpp[i-1], sigpp[i]) < 0){
ZC = add(ZC, 410); /* Q15 */
}
/* Initialize and update Mins */
if(sub(frm_count, 129) < 0){
if (sub(ENERGY, Min) < 0){
Min = ENERGY;
Prev_Min = ENERGY;
}
if((frm_count & 0x0007) == 0){
i = sub(shr(frm_count,3),1);
Min_buffer[i] = Min;
Min = MAX_16;
}
}
if((frm_count & 0x0007) == 0){
Prev_Min = Min_buffer[0];
for (i=1; i<16; i++){
if (sub(Min_buffer[i], Prev_Min) < 0){
Prev_Min = Min_buffer[i];
}
}
}
if(sub(frm_count, 129) >= 0){
if(((frm_count & 0x0007) ^ (0x0001)) == 0){
Min = Prev_Min;
Next_Min = MAX_16;
}
if (sub(ENERGY, Min) < 0){
Min = ENERGY;
}
if (sub(ENERGY, Next_Min) < 0){
Next_Min = ENERGY;
}
if((frm_count & 0x0007) == 0){
for (i=0; i<15; i++)
Min_buffer[i] = Min_buffer[i+1];
Min_buffer[15] = Next_Min;
Prev_Min = Min_buffer[0];
for (i=1; i<16; i++)
if (sub(Min_buffer[i], Prev_Min) < 0){
Prev_Min = Min_buffer[i];
}
}
}
if (sub(frm_count, INIT_FRAME) <= 0){
if(sub(ENERGY, 3072) < 0){
*marker = NOISE;
less_count++;
}
else{
*marker = VOICE;
acc0 = L_deposit_h(MeanE);
acc0 = L_mac(acc0, ENERGY, 1024);
MeanE = extract_h(acc0);
acc0 = L_deposit_h(MeanSZC);
acc0 = L_mac(acc0, ZC, 1024);
MeanSZC = extract_h(acc0);
for (i=0; i<M; i++){
acc0 = L_deposit_h(MeanLSF[i]);
acc0 = L_mac(acc0, lsf[i], 1024);
MeanLSF[i] = extract_h(acc0);
}
}
}
if (sub(frm_count, INIT_FRAME) >= 0){
if (sub(frm_count, INIT_FRAME) == 0){
acc0 = L_mult(MeanE, factor_fx[less_count]);
acc0 = L_shl(acc0, shift_fx[less_count]);
MeanE = extract_h(acc0);
acc0 = L_mult(MeanSZC, factor_fx[less_count]);
acc0 = L_shl(acc0, shift_fx[less_count]);
MeanSZC = extract_h(acc0);
for (i=0; i<M; i++){
acc0 = L_mult(MeanLSF[i], factor_fx[less_count]);
acc0 = L_shl(acc0, shift_fx[less_count]);
MeanLSF[i] = extract_h(acc0);
}
MeanSE = sub(MeanE, 2048); /* Q11 */
MeanSLE = sub(MeanE, 2458); /* Q11 */
}
dSE = sub(MeanSE, ENERGY);
dSLE = sub(MeanSLE, ENERGY_low);
dSZC = sub(MeanSZC, ZC);
if(sub(ENERGY, 3072) < 0){
*marker = NOISE;
}
else {
*marker = MakeDec(dSLE, dSE, SD, dSZC);
}
v_flag = 0;
if((prev_marker==VOICE) && (*marker==NOISE) && (add(dSE,410)<0)
&& (sub(ENERGY, 3072)>0)){
*marker = VOICE;
v_flag = 1;
}
if(flag == 1){
if((pprev_marker == VOICE) &&
(prev_marker == VOICE) &&
(*marker == NOISE) &&
(sub(abs_s(sub(prev_energy,ENERGY)), 614) <= 0)){
count_ext++;
*marker = VOICE;
v_flag = 1;
if(sub(count_ext, 4) <= 0){
flag=1;
}
else{
count_ext=0;
flag=0;
}
}
}
else{
flag=1;
}
if(*marker == NOISE){
count_sil++;
}
if((*marker == VOICE) && (sub(count_sil, 10) > 0) &&
(sub(sub(ENERGY,prev_energy), 614) <= 0)){
*marker = NOISE;
count_sil=0;
}
if(*marker == VOICE){
count_sil=0;
}
if ((sub(sub(ENERGY, 614), MeanSE)<0) && (sub(frm_count, 128) > 0)
&& (!v_flag) && (sub(rc, 19661) < 0)){
*marker = NOISE;
}
if ((sub(sub(ENERGY,614),MeanSE) < 0) && (sub(rc, 24576) < 0)
&& (sub(SD, 83) < 0)){
count_update++;
if (sub(count_update, INIT_COUNT) < 0){
COEF = 24576;
C_COEF = 8192;
COEFZC = 26214;
C_COEFZC = 6554;
COEFSD = 19661;
C_COEFSD = 13017;
}
else
if (sub(count_update, INIT_COUNT+10) < 0){
COEF = 31130;
C_COEF = 1638;
COEFZC = 30147;
C_COEFZC = 2621;
COEFSD = 21299;
C_COEFSD = 11469;
}
else
if (sub(count_update, INIT_COUNT+20) < 0){
COEF = 31785;
C_COEF = 983;
COEFZC = 30802;
C_COEFZC = 1966;
COEFSD = 22938;
C_COEFSD = 9830;
}
else
if (sub(count_update, INIT_COUNT+30) < 0){
COEF = 32440;
C_COEF = 328;
COEFZC = 31457;
C_COEFZC = 1311;
COEFSD = 24576;
C_COEFSD = 8192;
}
else
if (sub(count_update, INIT_COUNT+40) < 0){
COEF = 32604;
C_COEF = 164;
COEFZC = 32440;
C_COEFZC = 328;
COEFSD = 24576;
C_COEFSD = 8192;
}
else{
COEF = 32604;
C_COEF = 164;
COEFZC = 32702;
C_COEFZC = 66;
COEFSD = 24576;
C_COEFSD = 8192;
}
/* compute MeanSE */
acc0 = L_mult(COEF, MeanSE);
acc0 = L_mac(acc0, C_COEF, ENERGY);
MeanSE = extract_h(acc0);
/* compute MeanSLE */
acc0 = L_mult(COEF, MeanSLE);
acc0 = L_mac(acc0, C_COEF, ENERGY_low);
MeanSLE = extract_h(acc0);
/* compute MeanSZC */
acc0 = L_mult(COEFZC, MeanSZC);
acc0 = L_mac(acc0, C_COEFZC, ZC);
MeanSZC = extract_h(acc0);
/* compute MeanLSF */
for (i=0; i<M; i++){
acc0 = L_mult(COEFSD, MeanLSF[i]);
acc0 = L_mac(acc0, C_COEFSD, lsf[i]);
MeanLSF[i] = extract_h(acc0);
}
}
if((sub(frm_count, 128) > 0) && (((sub(MeanSE,Min) < 0) && (sub(SD, 83) < 0)
) || (sub(MeanSE,Min) > 2048))){
MeanSE = Min;
count_update = 0;
}
}
prev_energy = ENERGY;
}
/*******************/
/* Local functions */
/*******************/
static Word16 MakeDec(
Word16 dSLE, /* (i) : differential low band energy */
Word16 dSE, /* (i) : differential full band energy */
Word16 SD, /* (i) : differential spectral distortion */
Word16 dSZC /* (i) : differential zero crossing rate */
)
{
Word32 acc0;
/* SD vs dSZC */
acc0 = L_mult(dSZC, -14680); /* Q15*Q23*2 = Q39 */
acc0 = L_mac(acc0, 8192, -28521); /* Q15*Q23*2 = Q39 */
acc0 = L_shr(acc0, 8); /* Q39 -> Q31 */
acc0 = L_add(acc0, L_deposit_h(SD));
if (acc0 > 0){
return(VOICE);
}
acc0 = L_mult(dSZC, 19065); /* Q15*Q22*2 = Q38 */
acc0 = L_mac(acc0, 8192, -19446); /* Q15*Q22*2 = Q38 */
acc0 = L_shr(acc0, 7); /* Q38 -> Q31 */
acc0 = L_add(acc0, L_deposit_h(SD));
if (acc0 > 0){
return(VOICE);
}
/* dSE vs dSZC */
acc0 = L_mult(dSZC, 20480); /* Q15*Q13*2 = Q29 */
acc0 = L_mac(acc0, 8192, 16384); /* Q13*Q15*2 = Q29 */
acc0 = L_shr(acc0, 2); /* Q29 -> Q27 */
acc0 = L_add(acc0, L_deposit_h(dSE));
if (acc0 < 0){
return(VOICE);
}
acc0 = L_mult(dSZC, -16384); /* Q15*Q13*2 = Q29 */
acc0 = L_mac(acc0, 8192, 19660); /* Q13*Q15*2 = Q29 */
acc0 = L_shr(acc0, 2); /* Q29 -> Q27 */
acc0 = L_add(acc0, L_deposit_h(dSE));
if (acc0 < 0){
return(VOICE);
}
acc0 = L_mult(dSE, 32767); /* Q11*Q15*2 = Q27 */
acc0 = L_mac(acc0, 1024, 30802); /* Q10*Q16*2 = Q27 */
if (acc0 < 0){
return(VOICE);
}
/* dSE vs SD */
acc0 = L_mult(SD, -28160); /* Q15*Q5*2 = Q22 */
acc0 = L_mac(acc0, 64, 19988); /* Q6*Q14*2 = Q22 */
acc0 = L_mac(acc0, dSE, 512); /* Q11*Q9*2 = Q22 */
if (acc0 < 0){
return(VOICE);
}
acc0 = L_mult(SD, 32767); /* Q15*Q15*2 = Q31 */
acc0 = L_mac(acc0, 32, -30199); /* Q5*Q25*2 = Q31 */
if (acc0 > 0){
return(VOICE);
}
/* dSLE vs dSZC */
acc0 = L_mult(dSZC, -20480); /* Q15*Q13*2 = Q29 */
acc0 = L_mac(acc0, 8192, 22938); /* Q13*Q15*2 = Q29 */
acc0 = L_shr(acc0, 2); /* Q29 -> Q27 */
acc0 = L_add(acc0, L_deposit_h(dSE));
if (acc0 < 0){
return(VOICE);
}
acc0 = L_mult(dSZC, 23831); /* Q15*Q13*2 = Q29 */
acc0 = L_mac(acc0, 4096, 31576); /* Q12*Q16*2 = Q29 */
acc0 = L_shr(acc0, 2); /* Q29 -> Q27 */
acc0 = L_add(acc0, L_deposit_h(dSE));
if (acc0 < 0){
return(VOICE);
}
acc0 = L_mult(dSE, 32767); /* Q11*Q15*2 = Q27 */
acc0 = L_mac(acc0, 2048, 17367); /* Q11*Q15*2 = Q27 */
if (acc0 < 0){
return(VOICE);
}
/* dSLE vs SD */
acc0 = L_mult(SD, -22400); /* Q15*Q4*2 = Q20 */
acc0 = L_mac(acc0, 32, 25395); /* Q5*Q14*2 = Q20 */
acc0 = L_mac(acc0, dSLE, 256); /* Q11*Q8*2 = Q20 */
if (acc0 < 0){
return(VOICE);
}
/* dSLE vs dSE */
acc0 = L_mult(dSE, -30427); /* Q11*Q15*2 = Q27 */
acc0 = L_mac(acc0, 256, -29959); /* Q8*Q18*2 = Q27 */
acc0 = L_add(acc0, L_deposit_h(dSLE));
if (acc0 > 0){
return(VOICE);
}
acc0 = L_mult(dSE, -23406); /* Q11*Q15*2 = Q27 */
acc0 = L_mac(acc0, 512, 28087); /* Q19*Q17*2 = Q27 */
acc0 = L_add(acc0, L_deposit_h(dSLE));
if (acc0 < 0){
return(VOICE);
}
acc0 = L_mult(dSE, 24576); /* Q11*Q14*2 = Q26 */
acc0 = L_mac(acc0, 1024, 29491); /* Q10*Q15*2 = Q26 */
acc0 = L_mac(acc0, dSLE, 16384); /* Q11*Q14*2 = Q26 */
if (acc0 < 0){
return(VOICE);
}
return (NOISE);
}
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