Fundamentals of Voice-Quality Engineering in Wireless Networks

by Avi Perry

• ISBN13: 9780521855952
• ISBN10: 0521855950
• Edition: 1st
• Format: Hardcover
• Copyright: 2006-12-25
• Publisher: Cambridge University Press

Summary

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. 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. 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 are available on-line at www.cambridge.org/9780521855952.

Table of Contents

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.