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Speaker Smoothing with EMA3

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tudnai 2022-08-28 11:46:28 -07:00
parent e81eac79b2
commit c826e6228e
1 changed files with 6 additions and 5 deletions
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11
src/dev/audio/speaker.c
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@ -106,7 +106,7 @@ int spkr_last_level = SPKR_LEVEL_ZERO;
//static const int ema_len_supersoft = 80;
int spkr_ema_len = 640; // with EMA
//int spkr_ema_len = 45; // with EMA3
int spkr_ema3_len = 50; // with EMA3
#define BUFFER_COUNT 32
@ -717,9 +717,9 @@ INLINE static void spkr_filter_ema(spkr_sample_t * buf, int buf_size) {
INLINE static void spkr_filter_ema3(spkr_sample_t * buf, int buf_size) {
for ( int i = 0; i < buf_size; ) {
spkr_level_ema = ema(buf[i], spkr_level_ema, spkr_ema_len);
spkr_level_ema2 = ema(spkr_level_ema, spkr_level_ema2, spkr_ema_len);
spkr_level_ema3 = ema(spkr_level_ema2, spkr_level_ema3, spkr_ema_len);
spkr_level_ema = ema(buf[i], spkr_level_ema, spkr_ema3_len);
spkr_level_ema2 = ema(spkr_level_ema, spkr_level_ema2, spkr_ema3_len);
spkr_level_ema3 = ema(spkr_level_ema2, spkr_level_ema3, spkr_ema3_len);
// smoothing with EMA3
buf[i++] = spkr_level_ema3;
@ -878,7 +878,8 @@ INLINE static void spkr_filter() {
#ifdef SPKR_OVERSAMPLING
spkr_filter_ema( spkr_samples, SPKR_BUF_SIZE );
// spkr_filter_ema( spkr_samples, SPKR_BUF_SIZE );
spkr_filter_ema3( spkr_samples, SPKR_BUF_SIZE );
// spkr_filter_dema( spkr_samples, SPKR_BUF_SIZE );
// spkr_filter_tema( spkr_samples, SPKR_BUF_SIZE );
// spkr_filter_t3( spkr_samples, SPKR_BUF_SIZE );