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Advanced multi rate codec (AMR)
Advanced Multi Rate Codec (AMR) is a speech codec standardised by ETSI for GSM. The codec adapts its bit-rate allocation between speech and channel coding, thereby optimising speech quality in various radio channel conditions. For this reason, 3GPP (under which the next stage GSM speech quality will be realized) has selected the AMR codec as an essential speech codec for the next generation system.
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