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Adds cepstral mean subtraction (CMS) to analysis

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This commit is contained in:
Jean-Marc Valin 2011-11-21 14:35:41 -05:00
parent bb7b4f4e5e
commit ac3ac4a30c
2 changed files with 68 additions and 66 deletions
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14
src/analysis.c
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@ -81,6 +81,7 @@ typedef struct {
float E[NB_FRAMES][NB_TBANDS];
float lowE[NB_TBANDS], highE[NB_TBANDS];
float mem[32];
float cmean[8];
int E_count;
int count;
} TonalityAnalysisState;
@ -280,13 +281,15 @@ void tonality_analysis(TonalityAnalysisState *tonal, AnalysisInfo *info, CELTEnc
tonal->count++;
info->tonality = frame_tonality;
for (i=1;i<8;i++)
features[i-1] = -0.12299*(BFCC[i]+tonal->mem[i+24]) + 0.49195*(tonal->mem[i]+tonal->mem[i+16]) + 0.69693*tonal->mem[i+8];
for (i=0;i<8;i++)
features[i] = -0.12299*(BFCC[i]+tonal->mem[i+24]) + 0.49195*(tonal->mem[i]+tonal->mem[i+16]) + 0.69693*tonal->mem[i+8] - 1.4349*tonal->cmean[i];
for (i=0;i<8;i++)
tonal->cmean[i] = .95*tonal->cmean[i] + .05*BFCC[i];
for (i=0;i<8;i++)
features[7+i] = 0.63246*(BFCC[i]-tonal->mem[i+24]) + 0.31623*(tonal->mem[i]-tonal->mem[i+16]);
features[8+i] = 0.63246*(BFCC[i]-tonal->mem[i+24]) + 0.31623*(tonal->mem[i]-tonal->mem[i+16]);
for (i=0;i<8;i++)
features[15+i] = 0.53452*(BFCC[i]+tonal->mem[i+24]) - 0.26726*(tonal->mem[i]+tonal->mem[i+16]) -0.53452*tonal->mem[i+8];
features[16+i] = 0.53452*(BFCC[i]+tonal->mem[i+24]) - 0.26726*(tonal->mem[i]+tonal->mem[i+16]) -0.53452*tonal->mem[i+8];
for (i=0;i<8;i++)
{
tonal->mem[i+24] = tonal->mem[i+16];
@ -294,8 +297,7 @@ void tonality_analysis(TonalityAnalysisState *tonal, AnalysisInfo *info, CELTEnc
tonal->mem[i+8] = tonal->mem[i];
tonal->mem[i] = BFCC[i];
}
features[23] = info->tonality;
features[24] = info->tonality_slope;
features[24] = info->tonality;
features[25] = info->activity;
features[26] = frame_stationarity;