shithub: opus

Download patch

ref: d1a14ac5d4343bce71640d1e05595df9ffafa103
parent: 2a8bcf4c0f816e76b0093bbedb15389531a35c23
author: Jean-Marc Valin <jmvalin@amazon.com>
date: Tue Feb 15 19:58:40 EST 2022 

Making state update more robust to discontinuities


--- a/dnn/lpcnet.c
+++ b/dnn/lpcnet.c
@@ -192,8 +192,12 @@
         last_sig_ulaw = lin2ulaw(lpcnet->last_sig[0]);
         pred_ulaw = lin2ulaw(pred);
         exc = run_sample_network(&lpcnet->nnet, lpcnet->gru_a_condition, lpcnet->gru_b_condition, lpcnet->last_exc, last_sig_ulaw, pred_ulaw, lpcnet->sampling_logit_table, &lpcnet->rng);
-        if (i < preload) exc = lin2ulaw(output[i]-PREEMPH*lpcnet->deemph_mem - pred);
-        pcm = pred + ulaw2lin(exc);
+        if (i < preload) {
+          exc = lin2ulaw(output[i]-PREEMPH*lpcnet->deemph_mem - pred);
+          pcm = output[i]-PREEMPH*lpcnet->deemph_mem;
+        } else {
+          pcm = pred + ulaw2lin(exc);
+        }
         RNN_MOVE(&lpcnet->last_sig[1], &lpcnet->last_sig[0], LPC_ORDER-1);
         lpcnet->last_sig[0] = pcm;
         lpcnet->last_exc = exc;
@@ -201,7 +205,7 @@
         lpcnet->deemph_mem = pcm;
         if (pcm<-32767) pcm = -32767;
         if (pcm>32767) pcm = 32767;
-        output[i] = (int)floor(.5 + pcm);
+        if (i >= preload) output[i] = (int)floor(.5 + pcm);
     }
 }
 
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