fixed bug in codec2_pitch.c that was casuing problems with interpolation/decimation on 190924a. We were training using a discrete PDF of pitch values, so pitch embedding failed when we interpolated pitch during quantisation

CMakeLists.txt

@@ -73,7 +73,7 @@ endif()
 
 # grab latest NN model (or substitute your own)
 set(LPCNET_ROOT http://rowetel.com/downloads/deep/)
-set(LPCNET_FILE lpcnet_190924a_v1.0.tgz)
+set(LPCNET_FILE lpcnet_191005_v1.0.tgz)
 set(LPCNET_URL ${LPCNET_ROOT}${LPCNET_FILE})
 
 # Work around not having the FetchContent module.

src/codec2_pitch.c

@@ -102,12 +102,13 @@ int codec2_pitch_est(CODEC2_PITCH *pitch, float Sn[], float *f0, float *voicing)
     model.Wo = 2.0*M_PI/pitch_samples;
     dft_speech(&pitch->c2const, pitch->fft_fwd_cfg, Sw, Sn, pitch->w);
     two_stage_pitch_refinement(&pitch->c2const, &model, Sw);
+    pitch_samples = 2.0*M_PI/model.Wo;
     estimate_amplitudes(&model, Sw, pitch->W, 1);
     snr = est_voicing_mbe(&pitch->c2const, &model, Sw, pitch->W);
 
     *voicing = 1.0 - 2.0/pow(10.0, snr/10.0);
     if (*voicing < 0.0) *voicing = 0.0;
-    return (int)2*pitch_samples;
+    return round(2.0*pitch_samples);
 }
 
 void codec2_pitch_destroy(CODEC2_PITCH *pitch)

src/full_train.sh

@@ -12,7 +12,7 @@ SRC2=vk5apr_recording_21_may.wav # 64s
 SRC3=all_speechcat.sw            # 185 minutes, wide range of speakers
 SRC=train_src
 
-DATE=190924a
+DATE=191005
 
 synth() {
   ./src/dump_data --test --c2pitch ~/Downloads/$1.sw $1.f32