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TS 26.071SA4
Mandatory Speech Codec Speech Processing Functions –
AMR Speech Codec –
General Description

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V15.0.0 (PDF)  2018/06  13 p.
V14.0.0  2017/03  14 p.
V13.0.0  2015/12  14 p.
V12.0.0  2014/09  14 p.
V11.0.0  2012/09  14 p.
V10.0.0  2011/04  14 p.
V9.0.0  2009/12  14 p.
V8.0.0  2008/12  14 p.
V7.0.1  2007/07  14 p.
V6.0.0  2005/01  14 p.
V5.0.0  2002/06  14 p.
V4.0.0  2001/04  14 p.
V3.0.1  1999/10  14 p.
GSM Rel-98 v7.0.2  1999/12  12 p.

Rapporteur:  Dr. Bruhn, Stefan

The AMR speech coder consists of the multi-rate speech coder, a source controlled rate scheme including a voice activity detector and a comfort noise generation system, and an error concealment mechansim to combat the effects of transmission errors and lost packets.
The multi-rate speech coder is a single integrated speech codec with eight source rates from 4.75 kbit/s to 12.2 kbit/s, and a low rate background noise encoding mode. The speech coder is capable of switching its bit-rate every 20 ms speech frame upon command.
This TS is an introduction to the speech processing parts of the narrowband telephony speech service employing the Adaptive Multi-Rate (AMR) speech coder. A general overview of the speech processing functions is given, with reference to the documents where each function is specified in detail.

full Table of Contents for  TS 26.071  Word version:   15.0.0

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