Fundamentals of Voice-Quality Engineering in Wireless Networks

This book describes solutions for maximizing voice quality over wireless networks at the device and system levels.

Avi Perry (Author)

9780521855952, Cambridge University Press

Hardback, published 30 November 2006

376 pages
25.4 x 17.8 x 2.1 cm, 0.8 kg

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 levels. The book 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. A 'troubleshooting and case studies' chapter provides a useful approach to identifying and solving network impairments. 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, including a range of audio examples, are available online at www.cambridge.org/ 9781107407183.

Introduction
Part I. Voice Quality Foundations: 1. An overview of voice coding architectures in wireless communications
2. Quantitative assessment of voice quality
Part II. Applications: 3. Electrical echo and echo cancellation
4. Acoustic echo and its control
5. Noisy ambience, mobility, and noise reduction
6. Speech level control
Part III. Wireless Architectures: 7. Mobile-to-mobile stand-alone VQS architectures and their implications on data communications
8. The VQS evolution to 3G
Part IV. A Network Operator Guide for Selecting, Appraising, and Testing VQS: 9. A network operator guide to testing and appraising voice quality systems
10. Service provider's system, management, and delivery, requirements
11. Making economically sound investment decisions concerning voice quality systems
Part V. Managing the Network: 12. Trouble shooting and case studies
Part VI. Afterthoughts and Some Fresh Ideas: 13. Tracer probe
14. My sound
15. A procedure for evaluating and contrasting new wireless codecs performance with and without VQS
16. The theory of sleep
Part VII. Recordings: 17. Audio illustrations
Glossary of common voice quality systems terminology
Abbreviations.

Subject Areas: Educational: Technology [YQT], Computer networking & communications [UT], WAP [wireless technology TJKW], Electronics & communications engineering [TJ], Electrical engineering [THR]