def test_num_ceps(audio, num_ceps):
if num_ceps >= 23:
with pytest.raises(ValueError) as err:
PlpProcessor(num_ceps=num_ceps)
assert 'We must have num_ceps <= lpc_order+1' in str(err)
else:
proc = PlpProcessor(num_ceps=num_ceps)
if 0 < proc.num_ceps:
feat = proc.process(audio)
assert proc.num_ceps == num_ceps == proc.ndims
assert feat.shape == (140, num_ceps)
proc.use_energy = False
feat = proc.process(audio)
assert feat.shape == (140, num_ceps)
else:
with pytest.raises(RuntimeError):
proc.process(audio)
def get_plp_dd(wav_fn, norm):
"""Return the MFCCs with deltas and delta-deltas for a audio file."""
audio = Audio.load(wav_fn)
processor = PlpProcessor(sample_rate=audio.sample_rate, window_type="hamming",frame_length=0.025, frame_shift=0.01,
low_freq=0, vtln_low=60, vtln_high=7200, high_freq=audio.sample_rate/2)
plp_static = processor.process(audio, vtln_warp=1.0)
d_processor = DeltaPostProcessor(order=2)
plp_deltas = d_processor.process(plp_static)
features = np.float64(plp_deltas._to_dict()["data"])
if norm == "cmvn":
features = (features - np.mean(features, axis=0)) / np.std(features, axis=0)
return features