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LPCNet
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fixed bug that was causing unstable audio - pitch output from quantiser sometimes dropping beneath 40 which embed matrix wasn't trained for

pull/10/head
David 2019-10-09 18:22:32 +10:30
parent f8b793f4b0
commit a00820d7f9
1 changed files with 10 additions and 1 deletions
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11
src/lpcnet.c
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@ -24,6 +24,7 @@
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include "nnet_data.h"
@ -147,7 +148,15 @@ void lpcnet_synthesize(LPCNetState *lpcnet, short *output, const float *features
/* FIXME: Remove this -- it's just a temporary hack to match the Python code. */
static int start = 0; /*(LPC_ORDER+1*/;
/* FIXME: Do proper rounding once the Python code rounds properly. */
pitch = (int)floor(.1 + 50*features[36]+100);
pitch = (int)floor(.1 + 50*features[36]+100);
assert(pitch >=0); assert(pitch <= 255);
/* latest networks (using the codec 2 pitch estimator) are trained
with pitch estimates between 40 and 255, but due to the pitch
quantiser design and bit errors it's possible to get pitch
values down to 32, which upsets the pitch embed matrix */
if (pitch < 40) pitch = 40;
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];