Unverified Commit 3ebf4ad8 authored by Felicia Lim's avatar Felicia Lim
Browse files

Silk CNG adapts faster to received packets with lower gains

parent 86e5f5ea
......@@ -118,6 +118,10 @@ void silk_CNG(
/* Smooth gains */
for( i = 0; i < psDec->nb_subfr; i++ ) {
psCNG->CNG_smth_Gain_Q16 += silk_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );
/* If the smoothed gain is 3 dB greater than this subframe's gain, use this subframe's gain to adapt faster. */
if( silk_SMULWW( psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_THRESHOLD_Q16 ) > psDecCtrl->Gains_Q16[ i ] ) {
psCNG->CNG_smth_Gain_Q16 = psDecCtrl->Gains_Q16[ i ];
}
}
}
......
......@@ -225,6 +225,7 @@ extern "C"
/* Defines for CN generation */
#define CNG_BUF_MASK_MAX 255 /* 2^floor(log2(MAX_FRAME_LENGTH))-1 */
#define CNG_GAIN_SMTH_Q16 4634 /* 0.25^(1/4) */
#define CNG_GAIN_SMTH_THRESHOLD_Q16 46396 /* -3 dB */
#define CNG_NLSF_SMTH_Q16 16348 /* 0.25 */
#ifdef __cplusplus
......
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