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Mu-Law Encoding

Digital telephony equipment usually stores and transmits audio signals in 8-bit samples using PCM encoding. The value of the 8-bit sample corresponds to the amplitude (volume, loudness) of the audio signal at the time the sample was taken. There is a translation table which is used to determine the amplitude given the sample value. There are two different tables in common use: the A-Law table, which is widely used in Europe and Asia on E-1 trunks, and Mu-law (m-law) encoding used in the US, Canada and few other countries.