nnmnkwii.preprocessing.inv_mulaw_quantize¶

nnmnkwii.preprocessing.inv_mulaw_quantize(y, mu=256)[source]¶

Inverse of mu-law companding + quantize

Parameters

y (array-like) – Quantized signal (∈ [0, mu]).
mu (number) – Compression parameter μ.

Returns

Uncompressed signal ([-1, 1])

Return type

array-like

Examples

>>> from scipy.io import wavfile
>>> import pysptk
>>> import numpy as np
>>> from nnmnkwii import preprocessing as P
>>> fs, x = wavfile.read(pysptk.util.example_audio_file())
>>> x = (x / 32768.0).astype(np.float32)
>>> x_hat = P.inv_mulaw_quantize(P.mulaw_quantize(x))
>>> x_hat = (x_hat * 32768).astype(np.int16)