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…mehr
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.
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.
Inhaltsangabe
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.
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.
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