shithub: opus

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Fix flooring of the pitch period

Without the 0.1 bias, the rounding error could cause an offset of -1

--- a/dnn/lpcnet.c

+++ b/dnn/lpcnet.c

@@ -154,7 +154,7 @@

     /* FIXME: Remove this -- it's just a temporary hack to match the Python code. */

     static int start = LPC_ORDER+1;

     /* FIXME: Do proper rounding once the Python code rounds properly. */

-    pitch = (int)floor(50*features[36]+100);

+    pitch = (int)floor(.1 + 50*features[36]+100);

     /* FIXME: get the pitch gain from 2 frames in the past. */

     pitch_gain = features[PITCH_GAIN_FEATURE];

     run_frame_network(lpcnet, condition, gru_a_condition, features, pitch);

--- a/dnn/test_lpcnet.py

+++ b/dnn/test_lpcnet.py

@@ -59,7 +59,7 @@

 features = np.reshape(features, (nb_frames, feature_chunk_size, nb_features))

 features[:,:,18:36] = 0

-periods = (50*features[:,:,36:37]+100).astype('int16')

+periods = (.1 + 50*features[:,:,36:37]+100).astype('int16')

--- a/dnn/train_lpcnet.py

+++ b/dnn/train_lpcnet.py

@@ -136,7 +136,7 @@

 pred = np.reshape(pred, (nb_frames, pcm_chunk_size, 1))

 pred = pred.astype('uint8')

-periods = (50*features[:,:,36:37]+100).astype('int16')

+periods = (.1 + 50*features[:,:,36:37]+100).astype('int16')

 in_data = np.concatenate([in_data, pred], axis=-1)

@@ -143,7 +143,7 @@

 del pred

 # dump models to disk as we go

-checkpoint = ModelCheckpoint('lpcnet14_384_10_G16_{epoch:02d}.h5')

+checkpoint = ModelCheckpoint('lpcnet15_384_10_G16_{epoch:02d}.h5')

 #model.load_weights('lpcnet9b_384_10_G16_01.h5')

 model.compile(optimizer=Adam(0.001, amsgrad=True, decay=5e-5), loss='sparse_categorical_crossentropy', metrics=['sparse_categorical_accuracy'])

-- 

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