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G.711G.711 is an ITU-T standard for audio compression. It is primarily used in telephony.
There are 2 main algorithms defined in the standard, mu-law algorithm (used in America) and a-law algorithm (used in Europe and the rest of the world). Both are logarithmic, but the later a-law was specifically designed to be simpler for a computer to process.
The equations are:
a-law encoding thus takes a 12 or 16 bit audio sample as input and converts it to an 8 bit value as follows:
Where s is the sign bit.
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