ThEEf="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=ITU-T">ITU-TEf="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=standard">standard for {nonuniform quantising logarithmic comprEssion}. ThEEquation 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 Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=u-LAW">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)
