NDLI: Voice control of the pan-European digital mobile radio system

Content Provider	IEEE Xplore Digital Library
Author	Southcott, C.B. Freeman, D. Cosier, G. Sereno, D. van der Krogt, A. Gilloire, A. Braun, H.J.
Copyright Year	1989
Description	Author affiliation: British Telecom Res. Lab., Ipswich, UK (Southcott, C.B.; Freeman, D.; Cosier, G.)
Abstract	The DTX (discontinuous transmission) system that has been standardized by CEPT for the pan-European digital mobile radio system is described. In this mode the transmitter is switched on when a user begins to talk and switched off again when he or she stops. There are two reasons for using DTX: to increase the number of radio channels (by 100% or more) which can be accommodated in a given bandwidth and to reduce the power drain in hand portable equipment. It is noted that, while adding little degradation to the speech channel and very little additional cost, the DTX will increase considerably the capacity of the system. Particular attention is given to the voice activity detector, the comfort noise subsystem, speech frame substitution, objective and subjective testing, and complexity.
Starting Page	1070
Ending Page	1074
File Size	440691
Page Count	5
File Format	PDF
DOI	10.1109/GLOCOM.1989.64122
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-11-27
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio control Control systems Land mobile radio Radio transmitters Bandwidth Degradation Costs Detectors Speech enhancement Testing
Content Type	Text
Resource Type	Article

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