nnmnkwii.preprocessing.inv_mulaw¶
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nnmnkwii.preprocessing.
inv_mulaw
(y, mu=256)[source]¶ Inverse of mu-law companding (mu-law expansion)
\[f^{-1}(x) = sign(y) (1 / \mu) (1 + \mu)^{|y|} - 1)\]Parameters: - y (array-like) – Compressed signal. Each value of input signal must be in range of [-1, 1].
- mu (number) – Compression parameter
μ
.
Returns: Uncomprresed signal (-1 <= x <= 1)
Return type: array-like