WaveNet: Mu-law Expansion
Intermediate
The problem, from first principles
Generating audio requires turning the predicted companded value back into a sample, which is the inverse of mu-law companding. Expansion is exponential, so small compressed values map to small amplitudes.
From theory to code
Implement mu_law_decode(y, mu), the inverse of the companding function.
Constraints
- Mu-law decode inverts mu-law encode exactly.
Hints
Hint 1
Raise one plus mu to the magnitude, subtract one, divide by mu, and restore the sign.
Keywords
research-paperssequence-modelsgenerative-audioconvolution
Python
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