Chapter 10. Connection Quality – Voice

  1. William C. Hardy

Published Online: 18 APR 2002

DOI: 10.1002/0470845910.ch10

QoS: Measurement and Evaluation of Telecommunications Quality of Service

QoS: Measurement and Evaluation of Telecommunications Quality of Service

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

Author Information

  1. WorldCom, USA

Publication History

  1. Published Online: 18 APR 2002
  2. Published Print: 1 JUN 2001

ISBN Information

Print ISBN: 9780471499572

Online ISBN: 9780470845912

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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.