Refers to a suite of International Telecommunications Union (ITU) standards for audio (speech) compression and decompression. This family of standards is included in the G Series ITU Recommendations. The G.7xx recommendations are used in digital transmission systems, and in particular, used for the coding of analog signals into digital signals.

Telephony networks employ a system of coders and decoders, called a codec. A codec is used to reduce bandwidth requirements over limited capacity channels in two-way real-time communications. The codec takes an analog voice signal from an input source, like a microphone, and converts the analog signal into a digital format that can be transmitted across a packet network. At the receiving end the signal is converted back again to an analog signal for human consumption.

The G.7xx family of standards are comprised of speech and audio codecs that are primarily used in cellular telephony and Internet telephony including VoIP communications. There are several specifications (protocols) in the G.7xx family of G Series ITU Recommendations, including the following:

G.711 – Also known as Pulse Code Modulation (PCM), it is the ITU-T international standard for encoding telephone audio on a 64 kbps channel. PCM samples the signal 8000 times a second; each sample is represented by 8 bits for a total of 64 kbit/s. There are two versions of the this standard codec. The ��-law (pronounced as mew law) is generally used in North America and Japan digital communications. The A-law is used in European digital communications. The difference between the two standards is the method in which the analog signal is sampled. (

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