def testLinear2MelMatrix(self, n_mel, n_spec):
l2m = spectral_ops.linear_to_mel_weight_matrix(
num_mel_bins=n_mel,
num_spectrogram_bins=n_spec,
sample_rate=16000,
lower_edge_hertz=0.0,
upper_edge_hertz=8000.0)
self.assertEqual(l2m.shape, (n_spec, n_mel))
def testLinear2MelMatrix(self, n_mel, n_spec):
l2m = spectral_ops.linear_to_mel_weight_matrix(
num_mel_bins=n_mel,
num_spectrogram_bins=n_spec,
sample_rate=16000,
lower_edge_hertz=0.0,
upper_edge_hertz=8000.0)
self.assertEqual(l2m.shape, (n_spec, n_mel))
def _linear_to_mel_matrix(self):
"""Get the mel transformation matrix."""
num_freq_bins = self._nfft // 2
lower_edge_hertz = 0.0
upper_edge_hertz = self._sample_rate / 2.0
num_mel_bins = num_freq_bins // self._mel_downscale
return spectral_ops.linear_to_mel_weight_matrix(
num_mel_bins, num_freq_bins, self._sample_rate, lower_edge_hertz,
upper_edge_hertz)
def _linear_to_mel_matrix(self):
"""Get the mel transformation matrix."""
num_freq_bins = self._nfft // 2
lower_edge_hertz = 0.0
upper_edge_hertz = self._sample_rate / 2.0
num_mel_bins = num_freq_bins // self._mel_downscale
return spectral_ops.linear_to_mel_weight_matrix(
num_mel_bins, num_freq_bins, self._sample_rate, lower_edge_hertz,
upper_edge_hertz)
