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Definition: G.711

An ITU standard for speech codecs that provides toll quality audio at 64 Kbps using either A-Law or mu-Law PCM methods. The G.711 format has been the standard for digitizing voice by the telephone companies starting in the 1960s. However, newer algorithms have lowered the bit rate considerably, and respectable quality can be obtained at 16 Kbps and well below that, depending on the quality of all the components in the system.

The uncompressed G.711 format is a required codec for H.323 audio and videoconferencing in order to allow connections to legacy telephone networks. See G. standards and PCM.