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Making state update more robust to discontinuities

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This commit is contained in:
Jean-Marc Valin 2022-02-16 00:58:40 -05:00
parent 2a8bcf4c0f
commit d1a14ac5d4
1 changed files with 7 additions and 3 deletions
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10
dnn/lpcnet.c
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@ -192,8 +192,12 @@ void lpcnet_synthesize_tail_impl(LPCNetState *lpcnet, short *output, int N, int
last_sig_ulaw = lin2ulaw(lpcnet->last_sig[0]); last_sig_ulaw = lin2ulaw(lpcnet->last_sig[0]);
pred_ulaw = lin2ulaw(pred); 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); 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); if (i < preload) {
pcm = pred + ulaw2lin(exc); 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); RNN_MOVE(&lpcnet->last_sig[1], &lpcnet->last_sig[0], LPC_ORDER-1);
lpcnet->last_sig[0] = pcm; lpcnet->last_sig[0] = pcm;
lpcnet->last_exc = exc; lpcnet->last_exc = exc;
@ -201,7 +205,7 @@ void lpcnet_synthesize_tail_impl(LPCNetState *lpcnet, short *output, int N, int
lpcnet->deemph_mem = pcm; lpcnet->deemph_mem = pcm;
if (pcm<-32767) pcm = -32767; if (pcm<-32767) pcm = -32767;
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);
} }
} }