A-law
<standard> The ITU-T standard for nonuniform quantising logarithmic
compression.
The equation for A-law is
| A
| ------- (m/mp) |m/mp| =< 1/A
| 1+ln A
y = |
| sgn(m)
| ------ (1 + ln A|m/mp|) 1/A =< |m/mp| =< 1
| 1+ln A
Values of u=100 and 255, A=87.6, mp is the Peak message value, m is the
current quantised message value. (The formulae get
simpler if you substitute x for m/mp and sgn(x) for
sgn(m); then -1 <= x <= 1.)
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)
Nearby terms:
Alan M. Turing « Alan Shugart « Alan Turing «
A-law » ALC » Alcool-90 » ALCOR
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