shithub: opus

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Add deemphasis

--- a/dnn/lpcnet.c

+++ b/dnn/lpcnet.c

@@ -36,8 +36,8 @@

 #define NB_TOTAL_FEATURES 55

 #define LPC_ORDER 16

+#define PREEMPH 0.85f

-

 #define PITCH_GAIN_FEATURE 37

 #define PDF_FLOOR 0.002

@@ -53,6 +53,7 @@

     float old_input[FEATURES_DELAY][FEATURE_CONV2_OUT_SIZE];

     float old_lpc[FEATURES_DELAY][LPC_ORDER];

     int frame_count;

+    float deemph_mem;

 };

@@ -178,6 +179,8 @@

         RNN_MOVE(&lpcnet->last_sig[1], &lpcnet->last_sig[0], LPC_ORDER-1);

         lpcnet->last_sig[0] = output[i];

         lpcnet->last_exc = exc;

+        output[i] += PREEMPH*lpcnet->deemph_mem;

+        lpcnet->deemph_mem = output[i];

     }

 }

-- 

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