Fundamentals of Voice-Quality Engineering in Wireless Networks

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Cambridge University Press, 2007 - Computers - 353 pages
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Network operators are faced with the challenge of maximizing the quality of voice transmissions in wireless communications without impairing speech or data transmission. This book provides a comprehensive survey of voice quality algorithms, features, interactions, and trade-offs, at the device and system level. Using a practitioner rather than algorithm-designer angle, this book is unique. It elaborates on the root cause of impairments and ways for resolving them, as well as methodologies for measuring and quantifying voice quality before and after applying the remedies. The key issues are exemplified using case studies. Avoiding complex mathematics, the approach is based on real and sizable field experience supported by scientific and laboratory analysis. This title is suitable for practitioners in the wireless communications industry and graduate students in electrical engineering. Further resources for this title including a range of audio examples will be available online at www.cambridge.org/9780521855952.
 

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Contents

Introduction
1
Voicequality foundations
9
Quantitative assessment of voice quality
28
Electrical echo and echo cancelation
51
Acoustic echo and its control
83
Noisy ambience mobility and noise reduction
112
Speechlevel control
133
The VQS evolution to 3G
163
Service providers system management and delivery requirements
221
Making economically sound investment decisions
249
Trouble shooting and case studies
261
Tracer probe
289
A procedure for evaluating and contrasting new wireless codecs
299
Glossary of common voicequality systems terminology
313
Brief summary of echo cancelation and VQS major standards
330
Copyright

A network operators guide to testing and appraising voicequality systems
175

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About the author (2007)

Dr Avi Perry, a key contributor to the ITU-T G.168 standard, is currently an independent consultant. He was Vice President at NMS Communications, where he was responsible for core technology, system engineering, competitive analysis, documentation, and technical support. He has also held positions at Lucent Technologies and Bell Laboratories and the Northwestern University Graduate School of Management.

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