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Up-to-date, expert coverage of topics in wireless voice communications Voice communication is the most important facet of mobile radio service. Even when the predicted surge of wireless data and Internet services becomes a reality, voice will remain the most natural means of human communication. Voice Compression and Communications details issues in wireless voice communications and treats compression, channel coding, and wireless transmission as a joint subject. Part I covers background material, whereas Part II provides detailed information on both proprietary and standardized analysis-by-synthesis codecs, including the speech codecs of virtually all existing wireline-based and wireless systems. Parts III and IV discuss mainly research-based wideband, audio, as well as very low-rate schemes likely to find their way into future standards. Voice Compression and Communications describes fundamental concepts in a non-mathematical way early in the book for those with only a background knowledge of signal processing and communications. More advanced readers will find detailed discussions of theoretical principles, future concepts, and solutions to various specific wireless voice communications problems.
Voice communications remains the most important facet of mobile radio services, which may be delivered over conventional fixed links, the Internet or wireless channels. This all-encompassing volume reports on the entire 50-year history of voice compression, on recent audio compression techniques and the protection as well as transmission of these signals in hostile wireless propagation environments. Audio and Voice Compression for Wireless and Wireline Communications, Second Edition is divided into four parts with Part I covering the basics, while Part II outlines the design of analysis-by-synthesis coding, including a 100-page chapter on virtually all existing standardised speech codecs. The focus of Part III is on wideband and audio coding as well as transmission. Finally, Part IV concludes the book with a range of very low rate encoding techniques, scanning a range of research-oriented topics. Fully updated and revised second edition of “Voice Compression and Communications”, expanded to cover Audio features Includes two new chapters, on narrowband and wideband AMR coding, and MPEG audio coding Addresses the new developments in the field of wideband speech and audio compression Covers compression, error resilience and error correction coding, as well as transmission aspects, including cutting-edge turbo transceivers Presents both the historic and current view of speech compression and communications. Covering fundamental concepts in a non-mathematical way before moving to detailed discussions of theoretical principles, future concepts and solutions to various specific wireless voice communication problems, this book will appeal to both advanced readers and those with a background knowledge of signal processing and communications.
Voice communications remains the most important facet of mobile radio services, which may be delivered over conventional fixed links, the Internet or wireless channels. This all-encompassing volume reports on the entire 50-year history of voice compression, on recent audio compression techniques and the protection as well as transmission of these signals in hostile wireless propagation environments. Audio and Voice Compression for Wireless and Wireline Communications, Second Edition is divided into four parts with Part I covering the basics, while Part II outlines the design of analysis-by-synthesis coding, including a 100-page chapter on virtually all existing standardised speech codecs. The focus of Part III is on wideband and audio coding as well as transmission. Finally, Part IV concludes the book with a range of very low rate encoding techniques, scanning a range of research-oriented topics. Fully updated and revised second edition of “Voice Compression and Communications”, expanded to cover Audio features Includes two new chapters, on narrowband and wideband AMR coding, and MPEG audio coding Addresses the new developments in the field of wideband speech and audio compression Covers compression, error resilience and error correction coding, as well as transmission aspects, including cutting-edge turbo transceivers Presents both the historic and current view of speech compression and communications. Covering fundamental concepts in a non-mathematical way before moving to detailed discussions of theoretical principles, future concepts and solutions to various specific wireless voice communication problems, this book will appeal to both advanced readers and those with a background knowledge of signal processing and communications.
Compression technology has been employed for a long time, but until recently the technology was too complex for everyday applications. However, compression has now reached the stage where it can economically be applied to video and audio systems on a wide scale. This book recognises the wide applications of compression by treating the subject from first principles without assuming any particular background for the reader. An introductory chapter is included which suggests some applications of compression and how it works in a simplified form. In addition a fundamentals chapter contains all of the background necessary to follow the rest of the book. Theory is balanced with a wide range of practical applications in transmission and recording and throughout the book the reader will find notes of caution and outlines of various pitfalls for the unwary. Various descriptions are also included of the kinds of impairments which can result from the misuse of compression. John Watkinson is an independent consultant in digital video, audio and data technology. he is a fellow of the AES and presents lectures, conference papers and training courses worldwide. he is the author of numerous other Focal press books, including the Art of Digital Audio, the Art of Digital Video (both now in their second edition) and The Art of Data Recording, An Introduction to Digital Audio, An Introduction to Digital Video, The Digital Videotape recorder and RDAT. he is also co-author, with Francis Rumsey of The Digital Interface Handbook. covers basic principles no unnecessary mathematics includes a wide range of practical applications
This book presents a review of the latest advances in speech and video compression, computer networking protocols, the assessment and monitoring of VoIP quality, and next generation network architectures for multimedia services. The book also concludes with three case studies, each presenting easy-to-follow step-by-step instructions together with challenging hands-on exercises. Features: provides illustrative worked examples and end-of-chapter problems; examines speech and video compression techniques, together with speech and video compression standards; describes the media transport protocols RTP and RTCP, as well as the VoIP signalling protocols SIP and SDP; discusses the concepts of VoIP quality of service and quality of experience; reviews next-generation networks based on the IP multimedia subsystem and mobile VoIP; presents case studies on building a VoIP system based on Asterisk, setting up a mobile VoIP system based on Open IMS and Android mobile, and analysing VoIP protocols and quality.
Provides a thorough theoretical understanding of lossy compression techniques and systems, plus key features, applications, implementation issues, and design trade-offs. It also includes detailed comparisons of multimedia standards and their common and distinguishing features, examples based on real multimedia data, end-of-chapter review problems, and the basics of lossless coding.
“Microsoft Voice and Unified Communications is essential reading for anyone using—or considering—Microsoft’s range of VoIP options, from consumers to small business owners to enterprise customers.” --Xuedong Huang, General Manager, Microsoft Research Communications, Innovation Center “Joe Schurman has captured the essence of Microsoft’s vision and implementation in the areas of Voice and Unified Communications. This is an important book for those interested in connecting the dots between the present and the future in human communications and understanding why things are evolving in that way.” --Gurdeep Singh Pall, Microsoft Corporate Vice President, Unified Communications Group Microsoft® Voice and Unified Communications is a book that provides insight into Microsoft’s Voice and Unified Communications portfolio of products and services related to Microsoft Windows Live, Microsoft Response Point, and the Microsoft Unified Communications platform. Here’s What You’ll Find Inside. . . · Microsoft’s vision of voice products and services for consumer, small/medium businesses, and enterprise organizations including a foreword by Gurdeep Singh Pall, Microsoft Corporate Vice President, Unified Communications Group, and commentary by Xuedong Huang, General Manager of the Microsoft Research Communications Innovation Center. · Technical guidance and information related to Microsoft Windows Live, Microsoft Response Point, and the Microsoft Unified Communications platform, including the newly released Microsoft Office Communications Server 2007 R2. · Sales guidance for selling Microsoft voice solutions in the SMB and Enterprise markets. · Examples of customized Microsoft voice and unified communications applications. · Overview of Microsoft voice and unified communications security. · Latest Microsoft voice and unified communications research and development. · Understanding of voice, unified communications, and telephony concepts and terms as well as the history and evolution of communications technology.
"Digital Compression for Multimedia" captures in a single reference the current standards for speech, audio, video, image, fax and file compression. It is intended for engineers and computer scientists designing and implementing compression techniques, system integrators, technical managers, and researchers. The essential ideas and motivation behind the various compression methods are presented and insight is provided into the evolution of the standards.
Convergence in Broadcast and Communications Media offers concise and accurate information for engineers and technicians tackling products and systems combining audio, video, data processing and communications. Without adequate fundamental knowledge of the core technologies, products could be flawed or even fail. John Watkinson has provided a definitive professional guide, designed as a standard point of reference for engineers, whether you are from an audio, video, computer or communications background. Without assuming any background and starting from first principles, the four core technologies of image reproduction, sound reproduction, data processing and communications are described. Covering everything from digital fundamentals to conversion methods, sound and image technologies, compression techniques, digital coding principles, storage devices and the latest communications systems, the book shows how these technologies operate together and the necessary conversions that take place between them. Acronyms and buzzwords are introduced only after their purpose has been described in plain English - as the book serves to give a reliable grasp of the fundamentals. The criteria involved in determining image and sound quality are based on a thorough treatment of the human senses, a unique description of how motion portrayal works in managing systems. John Watkinson is an international consultant in audio video and data recording. He is a Fellow of the AES, a member of the British Computer Society and a chartered information systems practitioner. He presents lectures, seminars, conference papers and training courses worldwide and writes for many industry magazines. His other books for Focal Press are widely acknowledged as standard reference works and industry `bibles'. John is author of MPEG2, The Art of Digital Video and the Art of Digital Audio, An Introduction to Digital Video, An Introduction to Digital Audio, The Art of Sound Reproduction, Television Fundamentals, Co-author of The Digital Interface Handbook and Contributor to The Loudspeaker and Headphone Handbook.
Introduction to Digital Audio Coding and Standards provides a detailed introduction to the methods, implementations, and official standards of state-of-the-art audio coding technology. In the book, the theory and implementation of each of the basic coder building blocks is addressed. The building blocks are then fit together into a full coder and the reader is shown how to judge the performance of such a coder. Finally, the authors discuss the features, choices, and performance of the main state-of-the-art coders defined in the ISO/IEC MPEG and HDTV standards and in commercial use today. The ultimate goal of this book is to present the reader with a solid enough understanding of the major issues in the theory and implementation of perceptual audio coders that they are able to build their own simple audio codec. There is no other source available where a non-professional has access to the true secrets of audio coding.