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Information tone handling in the half-rate GSM voice activity detector

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1 Author(s)
Barrett, P.A. ; British Telecom Res. Labs., Ipswich, UK

A problem has been identified with the handling of information tones by the full-rate GSM voice activity detector (VAD). The paper describes the modifications made in the half-rate GSM VAD which significantly improve the transmission of information tones, thus enabling the implementation of discontinuous transmission (DTX) in the GSM down-link. The modification consists of the addition of a tone detection algorithm to the basic full-rate GSM VAD architecture. The underlying assumptions behind the tone detector are discussed and the potential performance limitations identified. The half-rate GSM VAD successfully detects almost all tones that are likely to be encountered in networks across the world

Published in:

Communications, 1995. ICC '95 Seattle, 'Gateway to Globalization', 1995 IEEE International Conference on  (Volume:1 )

Date of Conference:

18-22 Jun 1995