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Limit frequencies used in mel spectrogram to [125, 7600].

tuning
Keith Ito 2018-03-17 14:27:57 -07:00
parent 70ba4aaf69
commit 475ed791bf
2 changed files with 4 additions and 1 deletions
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2
hparams.py
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@ -10,6 +10,8 @@ hparams = tf.contrib.training.HParams(
# Audio:
num_mels=80,
num_freq=1025,
min_mel_freq=125,
max_mel_freq=7600,
sample_rate=20000,
frame_length_ms=50,
frame_shift_ms=12.5,

3
util/audio.py
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@ -130,7 +130,8 @@ def _linear_to_mel(spectrogram):
def _build_mel_basis():
n_fft = (hparams.num_freq - 1) * 2
return librosa.filters.mel(hparams.sample_rate, n_fft, n_mels=hparams.num_mels)
return librosa.filters.mel(hparams.sample_rate, n_fft, n_mels=hparams.num_mels,
fmin=hparams.min_mel_freq, fmax=hparams.max_mel_freq)
def _amp_to_db(x):
return 20 * np.log10(np.maximum(1e-5, x))