Chapter 10. Connection Quality – Voice
Published Online: 18 APR 2002
DOI: 10.1002/0470845910.ch10
Copyright © 2001 John Wiley & Sons, Ltd
Book Title
QoS: Measurement and Evaluation of Telecommunications Quality of Service
Additional Information
How to Cite
Hardy, W. C. (2002) Connection Quality – Voice, in QoS: Measurement and Evaluation of Telecommunications Quality of Service, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/0470845910.ch10
Publication History
- Published Online: 18 APR 2002
- Published Print: 1 JUN 2001
ISBN Information
Print ISBN: 9780471499572
Online ISBN: 9780470845912
- Summary
- Chapter
Keywords:
- cross-talk;
- echo;
- impairment;
- ITU P.800;
- low volume;
- mean opinion score;
- MOS;
- noise;
- P.800;
- service attribute test;
- speech distortion;
- subjective test
Summary
Describes the mechanisms by which users judge the quality of what is experienced over a voice connection, and identifies a set of clearly recognizable impairments that may be experienced. Defines generic measures of perceived quality of a voice connection to be statistics describing users' subjective evaluations of the overall quality of calls, as quantified by a Mean Opinion Score, and the usability of the service, as quantified by the proportion of calls rated as being “unusable”, “difficult”, or “irritating”. Describes the origins and use of the Service Attribute Test (SAT), a particular test protocol that can generate both measures of voice quality and correlating profiles of the incidence and severity of impairments. Presents guidelines for interpreting the results from SATs.