VolP Service Quality

Measuring and Evaluating Packet-Switched Voice

William C. Hardy

332 pages, parution le 27/02/2003

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Résumé

Despite the features that make Voice over IP so attractive from the standpoint of cost and flexibility of telephone services, businesses will only adopt it once they've determined whether, and under what circumstances, the quality of VoIP will be satisfactory to users.

This hands-on guide supplies you with all the tools you need for VoIP service quality analysis, including explicit directions for:

designing subjective tests and interpreting results
selecting, extending, and applying speech distortion and multiple effects models
examining call set-up times for IP telephony
determining requirements for multimedia exchanges.

Without jargon, or tech talk, Hardy delivers solid information on means of measuring, assessing, and improving VoIP quality. He gives you expert information and hands-on specifics, showing you:

The factors that can create a negative caller experience and how packet switching affects them
What to look for in assessing VoIP quality
How to elicit and interpret user evaluations of voice quality
How to estimate likely user perception of voice quality by objective test and analysis
When and how to apply alternative quality measurement techniques to overcome quality shortfalls.

Contents

Part 1: FOUNDATIONS

Basics
Principal System-Level Determinants of Connection Quality
Quality Expectations and Requirements
Impairments Created or Exacerbated by Packet Switching

Part 2: MEASUREMENT AND EVALUATION OF VOICE QUALITY

Voice Quality
Service Attribute Tests
Measurement of Speech Distortion
Multiple-Effects Models
Applications

Part 3: OTHER ASPECTS OF QUALITY OF SERVICE

Other Quality of Service Concerns
Quality of Voice for Interactive Multimedia Exchange

Afterword

Appendix A: Types of Codecs
Appendix B: How a Jitter Buffer Works
Appendix C: Extensions of the Loss/Noise Grade of Service Model
Appendix D: U.S. Patents for Voice Quality Measurement and Analysis Technology

Caractéristiques techniques

	PAPIER
Éditeur(s)	Mc Graw Hill
Auteur(s)	William C. Hardy
Parution	27/02/2003
Nb. de pages	332
Format	19 x 24
Couverture	Relié
Poids	740g
Intérieur	Noir et Blanc
EAN13	9780071410762
ISBN13	978-0-07-141076-2