An Adaptive Multirate Speech Codec Proposed for the GSM

Authors:

Xu, W. ,  Heinen, S. ,  Adrat, M. ,  Vary, P. ,  Hindelang, T. ,  Schmautz, M. ,  Hagenauer, J.

Book Title:

Proceedings of International ITG Conference on Source and Channel Coding (SCC)

Pages:

p.p. 51-56

Address:

Munich, Germany

Date:

Jan. 2000

Language:

English

Abstract

An adaptive multirate (AMR) speech codec proposed for the GSM is described. By dynamically splitting the gross bit rates between source (speech) and channel coding according to the channel quality, almost wireline speech quality even for poor channel conditions, and higher speech quality for relatively good conditions can be achieved. The CELP based speech codec and the RSC based channel codec were designed as homogenous/hierarchical as possible for a robust transmission. Novel algorithms for mode bit coding and error concealment were used. One of out design philosophy employed was that the source and channel codecs are jointly instead of individually optimized.

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