Fundamentals of Voice-Quality Engineering in Wireless Networks

Description

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. 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. 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/9780521855952.

• A trouble-shooting and case studies section provides a useful approach to identifying and solving network impairments
• Audio recordings, available on-line (www.cambridge.org/9780521855952), enhance understanding by presenting a physical illustration of the issues
• Written from a practitioner rather than algorithm-design perspective, the issues are covered using logical reasoning and not complicated mathematics, making the book accessible to product managers, office managers, and sales, marketing and purchasing agents

 

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.

描述

網路運營商面臨著在無線通信中最大化語音傳輸質量的挑戰，同時不損害語音或數據傳輸。本書全面調查了設備和系統層面上的語音質量算法、特性、交互作用和權衡。本書以實踐者而非算法設計者的角度進行，這是獨特的。本書詳細說明了語音傳輸問題的根本原因和解決方法，以及在應用解決方案之前和之後測量和量化語音質量的方法。一個“故障排除和案例研究”章節提供了一種有用的方法來識別和解決網絡問題。避免複雜的數學，這種方法基於真實且豐富的現場經驗，並得到科學和實驗室分析的支持。本書適合無線通信行業的從業人員和電氣工程研究生。更多資源，包括一系列音頻示例，可在線上獲得，網址為www.cambridge.org/9780521855952。

目錄

引言；第一部分 語音質量基礎：1. 無線通信中語音編碼架構概述；2. 語音質量的定量評估；第二部分 應用：3. 電子回音和回音消除；4. 音響回音及其控制；5. 噪音環境、移動性和降噪；6. 語音水平控制；第三部分 無線通信架構：7. 手機對手機獨立語音質量系統架構及其對數據通信的影響；8. 語音質量系統在3G中的演進；第四部分 網絡運營商選擇、評估和測試語音質量系統指南：9. 網絡運營商測試和評估語音質量系統指南；10. 服務提供商的系統、管理和交付要求；11. 在語音質量系統方面做出經濟合理的投資決策；第五部分 管理網絡：12. 故障排除和案例研究；第六部分 一些新的想法：13. 追踪探針；14. 我的聲音；15. 一種評估和對比新無線編碼器在有無語音質量系統下性能的程序；16. 睡眠理論；第七部分 音頻錄音：17. 音頻示例；常見語音質量系統術語詞彙表；縮寫。