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The North America standard for nonuniform quantising logarithmic compression.


A North American telephony standard for converting analog voice into a digital data stream using pulse code modulation (PCM). The "pulse code" in PCM comes from the telephone company's method of sending a pulse or no pulse down the line.

Mu-Law signals typically ride on a single 64 Kbps DS0 channel in a T1 line. Mu-Law uses a companding technique that provides more quantization steps at lower amplitude (volume) than at higher amplitude. North America and Japan use mu-Law, while Europe uses A-Law. Mu-Law comes from µ-Law, which uses the Greek letter µ, pronounced "myoo." See PCM and A-Law.
References in periodicals archive ?
There are free applications such as WiresharkA that can be used to capture and listen to Mu-law and A-law calls.
Now POLQA supports 12 bit degraded file (NB, WB, SWB) and 8-bit a-Law and mu-Law voice files and it also supports Raw PCM as well as WAV files with auto-detect sampling for WAV files.
The G.711 codec also supports A-law, Mu-law, and passes all ITU verification tests.
The files are recorded in mu-law format for tProbe[TM] T1 and in A-law for tProbe[TM] E1.