shithub: opus

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Properly delaying the pitch gain

--- a/dnn/lpcnet.c

+++ b/dnn/lpcnet.c

@@ -50,6 +50,7 @@

     float last_sig[LPC_ORDER];

     float old_input[FEATURES_DELAY][FEATURE_CONV2_OUT_SIZE];

     float old_lpc[FEATURES_DELAY][LPC_ORDER];

+    float old_gain[FEATURES_DELAY];

     int frame_count;

     float deemph_mem;

 };

@@ -153,8 +154,9 @@

     static int start = LPC_ORDER+1;

     /* FIXME: Do proper rounding once the Python code rounds properly. */

     pitch = (int)floor(.1 + 50*features[36]+100);

-    /* FIXME: get the pitch gain from 2 frames in the past. */

-    pitch_gain = features[PITCH_GAIN_FEATURE];

+    pitch_gain = lpcnet->old_gain[FEATURES_DELAY-1];

+    memmove(&lpcnet->old_gain[1], &lpcnet->old_gain[0], (FEATURES_DELAY-1)*sizeof(lpcnet->old_gain[0]));

+    lpcnet->old_gain[0] = features[PITCH_GAIN_FEATURE];

     run_frame_network(lpcnet, condition, gru_a_condition, features, pitch);

     memcpy(lpc, lpcnet->old_lpc[FEATURES_DELAY-1], LPC_ORDER*sizeof(lpc[0]));

     memmove(lpcnet->old_lpc[1], lpcnet->old_lpc[0], (FEATURES_DELAY-1)*LPC_ORDER*sizeof(lpc[0]));

-- 

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