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Line 18: From this equation, it is often said that the SNR is approximately 6dB per bit. In digital [[telephone\|telephony]], two popular quantization schemes are the '[[A-law algorithm\|A-law]]' (dominant in [[Europe]]) and '[[Mu-law algorithm\|µ-law]]' (dominant in [[North America]] and [[Japan]]). These schemes map discrete analog values to an 8 bit scale that is nearly linear for small values and then increase logarithmically as amplitude grows. Because the human ear's perception of [[loudness]] is roughly logarithmic, this provides ~~providing~~ a higher signal to noise ratio over the range of audible sound intensities for a given number of bits. See also:

Quantization (signal processing): Difference between revisions