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Using modified pitch correlation from LPCNet #43

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Using modified pitch correlation from LPCNet #43

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f799a68
Using modified pitch correlation from LPCNet
TeaPoly Feb 15, 2022
d9781ea
Fix pitch correlation denominator
TeaPoly Feb 15, 2022
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13 changes: 12 additions & 1 deletion src/pitch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -365,6 +365,17 @@ void pitch_search(const opus_val16 *x_lp, opus_val16 *y,
#endif
);

/*
A modified pitch correlation inspired by section 3.1 Features and Quantization: Pitch
in the paper <A Real-Time Wideband Neural Vocoder at 1.6 kb/s Using LPCNet>.

Link: https://jmvalin.ca/papers/lpcnet_codec.pdf
*/
*pitch_corr = 2*xcorr[best_pitch[0]] / (
1+celt_inner_prod(x_lp, x_lp, len>>1)+
celt_inner_prod(&y[best_pitch[0]], &y[best_pitch[0]], len>>1)
);

/* Refine by pseudo-interpolation */
if (best_pitch[0]>0 && best_pitch[0]<(max_pitch>>1)-1)
{
Expand All @@ -382,7 +393,7 @@ void pitch_search(const opus_val16 *x_lp, opus_val16 *y,
offset = 0;
}
*pitch = 2*best_pitch[0]-offset;
*pitch_corr = xcorr[best_pitch[0]];
/* *pitch_corr = xcorr[best_pitch[0]]; */
}

#ifdef FIXED_POINT
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