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Add deemphasis

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This commit is contained in:
Jean-Marc Valin 2018-11-27 12:34:39 -05:00
parent 5ac0ac7acc
commit 0ddfdfc7c0
1 changed files with 4 additions and 1 deletions
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5
dnn/lpcnet.c
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@ -36,7 +36,7 @@
#define NB_TOTAL_FEATURES 55 #define NB_TOTAL_FEATURES 55
#define LPC_ORDER 16 #define LPC_ORDER 16
#define PREEMPH 0.85f
#define PITCH_GAIN_FEATURE 37 #define PITCH_GAIN_FEATURE 37
#define PDF_FLOOR 0.002 #define PDF_FLOOR 0.002
@ -53,6 +53,7 @@ struct LPCNetState {
float old_input[FEATURES_DELAY][FEATURE_CONV2_OUT_SIZE]; float old_input[FEATURES_DELAY][FEATURE_CONV2_OUT_SIZE];
float old_lpc[FEATURES_DELAY][LPC_ORDER]; float old_lpc[FEATURES_DELAY][LPC_ORDER];
int frame_count; int frame_count;
float deemph_mem;
}; };
@ -178,6 +179,8 @@ void lpcnet_synthesize(LPCNetState *lpcnet, short *output, const float *features
RNN_MOVE(&lpcnet->last_sig[1], &lpcnet->last_sig[0], LPC_ORDER-1); RNN_MOVE(&lpcnet->last_sig[1], &lpcnet->last_sig[0], LPC_ORDER-1);
lpcnet->last_sig[0] = output[i]; lpcnet->last_sig[0] = output[i];
lpcnet->last_exc = exc; lpcnet->last_exc = exc;
output[i] += PREEMPH*lpcnet->deemph_mem;
lpcnet->deemph_mem = output[i];
} }
} }