AMR

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company: VoiceAge
samples: http://samples.mplayerhq.hu/amr/
specification: http://www.3gpp.org/ftp/Specs/html-info/26-series.htm
Wikipedia article: http://en.wikipedia.org/wiki/Adaptive_Multi-Rate

AMR (Adaptive Multi-Rate) is a vocoder employed in low-bitrate applications like mobile phones. There are narrowband and wideband variants of this codec.

AMR

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