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De - Pt| English Dictionary: A-law | by the DICT Development Group |
| 1 result for A-law | |
| From The Free On-line Dictionary of Computing (15Feb98) [foldoc]: | |
|
A-law 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) | |
