diff options
| author | Felicia Lim <flim@google.com> | 2019-05-31 23:58:44 +0300 |
|---|---|---|
| committer | Felicia Lim <flim@google.com> | 2019-06-01 00:13:03 +0300 |
| commit | 3ebf4ad86de2469572f7fa2bd6451469e7867c8f (patch) | |
| tree | 972c330a89c870444e44c01963a2130cb7c67bfe /silk | |
| parent | 86e5f5ea56529d688568929d036574a93311e82a (diff) | |
Silk CNG adapts faster to received packets with lower gains
Diffstat (limited to 'silk')
| -rw-r--r-- | silk/CNG.c | 4 | ||||
| -rw-r--r-- | silk/define.h | 1 |
2 files changed, 5 insertions, 0 deletions
@@ -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 ]; + } } } diff --git a/silk/define.h b/silk/define.h index 247cb0bf..491c86f3 100644 --- a/silk/define.h +++ b/silk/define.h @@ -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 |