Non-uniform quantising logarithmic compression

The kind of compression often applied to a sound waveform. Logarithmic compression is a good match for the human ear's sensitivity but cannot handle zero amplitude (for which the logarithm is negative infinity).

There are two standard compression functions which give a smooth transition between the logarithmic function and a linear segment passing through the origin: mu-law (North America) and A-law (ITU-T).

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non parity non-polynomial Non Return to Zero Inverted nontrivial Non-Uniform Memory Access		Non-Uniform Rational B Spline non-volatile non-volatile memory Non-Volatile Random Access Memory non-volatile storage