A-law

An a-law algorithm is a standard companding algorithm, used in European digital communications systems to optimize, i.e., modify, the dynamic range of an analog signal for digitizing.It is similar to the μ-law algorithm used in North America and Japan.For a given input x, the equation for A-law encoding is as follows,
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<standard> The ITU-T standard for nonuniform quantising logarithmic compression.
The equation for A-law is
| A | ------- (m/mp) |m/mp| =Converting from u-LAW to A-LAW introduces quantising errors. u-law is used in North America and Japan, and A-law is used in Europe and the rest of the world and international routes.
[The Audio File Formats FAQ]
(1995-02-21)

A-LAW