Voip Voice And Fax Signal Processing

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VoIP Voice and Fax Signal Processing :

Technology & Engineering

Author - Sivannarayana Nagireddi
Publisher - John Wiley & Sons
Pages - 380
ISBN - 0470377860


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Detail - A complete and systematic treatment of signal processing for VoIP voice and fax This book presents a consolidated view and basic approach to signal processing for VoIP voice and fax solutions. It provides readers with complete coverage of the topic, from how things work in voice and fax modules, to signal processing aspects, implementation, and testing. Beginning with an overview of VoIP infrastructure, interfaces, and signals, the book systematically covers: Voice compression Packet loss concealment techniques DTMF detection, generation, and rejection Wideband voice modules operation VoIP Voice-Network bit rate calculations VoIP voice testing Fax over IP and modem over IP Country deviations of PSTN mapped to VoIP VoIP on different processors and architectures Generic VAD-CNG for waveform codecs Echo cancellation Caller ID features in VoIP Packetization—RTP, RTCP, and jitter buffer Clock sources for VoIP applications Fax operation on PSTN, modulations, and fax messages Fax over IP payload formats and bit rate calculations Voice packets jitter with large data packets VoIP voice quality Over 100 questions and answers on voice and more than seventy questions and answers on fax are provided at the back of the book to reinforce the topics covered throughout the text. Additionally, several clarification, interpretation, and discussion sections are included in selected chapters to aide in readers' comprehension. VoIP Voice and Fax Signal Processing is an indispensable resource for professional electrical engineers, voice and fax solution developers, product and deployment support teams, quality assurance and test engineers, and computer engineers. It also serves as a valuable textbook for graduate-level students in electrical engineering and computer engineering courses.

VoIP Voice and Fax Signal Processing :

Technology & Engineering

Author - Sivannarayana Nagireddi
Publisher - Wiley-Interscience
Pages - 592
ISBN - 9780470227367


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Detail - A complete and systematic treatment of signal processing for VoIP voice and fax This book presents a consolidated view and basic approach to signal processing for VoIP voice and fax solutions. It provides readers with complete coverage of the topic, from how things work in voice and fax modules, to signal processing aspects, implementation, and testing. Beginning with an overview of VoIP infrastructure, interfaces, and signals, the book systematically covers: Voice compression Packet loss concealment techniques DTMF detection, generation, and rejection Wideband voice modules operation VoIP Voice-Network bit rate calculations VoIP voice testing Fax over IP and modem over IP Country deviations of PSTN mapped to VoIP VoIP on different processors and architectures Generic VAD-CNG for waveform codecs Echo cancellation Caller ID features in VoIP Packetization—RTP, RTCP, and jitter buffer Clock sources for VoIP applications Fax operation on PSTN, modulations, and fax messages Fax over IP payload formats and bit rate calculations Voice packets jitter with large data packets VoIP voice quality Over 100 questions and answers on voice and more than seventy questions and answers on fax are provided at the back of the book to reinforce the topics covered throughout the text. Additionally, several clarification, interpretation, and discussion sections are included in selected chapters to aide in readers' comprehension. VoIP Voice and Fax Signal Processing is an indispensable resource for professional electrical engineers, voice and fax solution developers, product and deployment support teams, quality assurance and test engineers, and computer engineers. It also serves as a valuable textbook for graduate-level students in electrical engineering and computer engineering courses.

VoIP and Unified Communications : Internet Telephony and the Future Voice Network

Technology & Engineering

Author - William A. Flanagan
Publisher - John Wiley & Sons
Pages - 320
ISBN - 1118166035


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Detail - Translates technical jargon into practical business communications solutions This book takes readers from traditional voice, fax, video, and data services delivered via separate platforms to a single, unified platform delivering all of these services seamlessly via the Internet. With its clear, jargon-free explanations, the author enables all readers to better understand and assess the growing number of voice over Internet protocol (VoIP) and unified communications (UC) products and services that are available for businesses. VoIP and Unified Communications is based on the author's careful review and synthesis of more than 7,000 pages of published standards as well as a broad range of datasheets, websites, white papers, and webinars. It begins with an introduction to IP technology and then covers such topics as: Packet transmission and switching VoIP signaling and call processing How VoIP and UC are defining the future Interconnections with global services Network management for VoIP and UC This book features a complete chapter dedicated to cost analyses and payback calculations, enabling readers to accurately determine the short- and long-term financial impact of migrating to various VoIP and UC products and services. There's also a chapter detailing major IP systems hardware and software. Throughout the book, diagrams illustrate how various VoIP and UC components and systems work. In addition, the author highlights potential problems and threats to UC services, steering readers away from common pitfalls. Concise and to the point, this text enables readers—from novices to experienced engineers and technical managers—to understand how VoIP and UC really work so that everyone can confidently deal with network engineers, data center gurus, and top management.

Noise Reduction in Speech Processing :

Technology & Engineering

Author - Jacob Benesty, Jingdong Chen, Yiteng Huang, Israel Cohen
Publisher - Springer Science & Business Media
Pages - 230
ISBN - 364200296X


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Detail - Noise is everywhere and in most applications that are related to audio and speech, such as human-machine interfaces, hands-free communications, voice over IP (VoIP), hearing aids, teleconferencing/telepresence/telecollaboration systems, and so many others, the signal of interest (usually speech) that is picked up by a microphone is generally contaminated by noise. As a result, the microphone signal has to be cleaned up with digital signal processing tools before it is stored, analyzed, transmitted, or played out. This cleaning process is often called noise reduction and this topic has attracted a considerable amount of research and engineering attention for several decades. One of the objectives of this book is to present in a common framework an overview of the state of the art of noise reduction algorithms in the single-channel (one microphone) case. The focus is on the most useful approaches, i.e., filtering techniques (in different domains) and spectral enhancement methods. The other objective of Noise Reduction in Speech Processing is to derive all these well-known techniques in a rigorous way and prove many fundamental and intuitive results often taken for granted. This book is especially written for graduate students and research engineers who work on noise reduction for speech and audio applications and want to understand the subtle mechanisms behind each approach. Many new and interesting concepts are presented in this text that we hope the readers will find useful and inspiring.

Principles of Speech Coding :

Technology & Engineering

Author - Tokunbo Ogunfunmi, Madihally Narasimha
Publisher - CRC Press
Pages - 381
ISBN - 1439882541


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Detail - It is becoming increasingly apparent that all forms of communication—including voice—will be transmitted through packet-switched networks based on the Internet Protocol (IP). Therefore, the design of modern devices that rely on speech interfaces, such as cell phones and PDAs, requires a complete and up-to-date understanding of the basics of speech coding. Outlines key signal processing algorithms used to mitigate impairments to speech quality in VoIP networks Offering a detailed yet easily accessible introduction to the field, Principles of Speech Coding provides an in-depth examination of the underlying signal processing techniques used in speech coding. The authors present coding standards from various organizations, including the International Telecommunication Union (ITU). With a focus on applications such as Voice-over-IP telephony, this comprehensive text covers recent research findings on topics including: A general introduction to speech processing Digital signal processing concepts Sampling theory and related topics Principles of pulse code modulation (PCM) and adaptive differential pulse code modulation (ADPCM) standards Linear prediction (LP) and use of the linear predictive coding (LPC) model Vector quantization and its applications in speech coding Case studies of practical speech coders from ITU and others The Internet low-bit-rate coder (ILBC) Developed from the authors’ combined teachings, this book also illustrates its contents by providing a real-time implementation of a speech coder on a digital signal processing chip. With its balance of theory and practical coverage, it is ideal for senior-level undergraduate and graduate students in electrical and computer engineering. It is also suitable for engineers and researchers designing or using speech coding systems in their work.

Multimedia Signal Processing : Theory and Applications in Speech, Music and Communications

Science

Author - Saeed V. Vaseghi
Publisher - John Wiley & Sons
Pages - 680
ISBN - 9780470066492


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Detail - Multimedia Signal Processing is a comprehensive and accessible text to the theory and applications of digital signal processing (DSP). The applications of DSP are pervasive and include multimedia systems, cellular communication, adaptive network management, radar, pattern recognition, medical signal processing, financial data forecasting, artificial intelligence, decision making, control systems and search engines. This book is organised in to three major parts making it a coherent and structured presentation of the theory and applications of digital signal processing. A range of important topics are covered in basic signal processing, model-based statistical signal processing and their applications. Part 1: Basic Digital Signal Processing gives an introduction to the topic, discussing sampling and quantization, Fourier analysis and synthesis, Z-transform, and digital filters. Part 2: Model-based Signal Processing covers probability and information models, Bayesian inference, Wiener filter, adaptive filters, linear prediction hidden Markov models and independent component analysis. Part 3: Applications of Signal Processing in Speech, Music and Telecommunications explains the topics of speech and music processing, echo cancellation, deconvolution and channel equalization, and mobile communication signal processing. Covers music signal processing, explains the anatomy and psychoacoustics of hearing and the design of MP3 music coder Examines speech processing technology including speech models, speech coding for mobile phones and speech recognition Covers single-input and multiple-inputs denoising methods, bandwidth extension and the recovery of lost speech packets in applications such as voice over IP (VoIP) Illustrated throughout, including numerous solved problems, Matlab experiments and demonstrations Companion website features Matlab and C++ programs with electronic copies of all figures. This book is ideal for researchers, postgraduates and senior undergraduates in the fields of digital signal processing, telecommunications and statistical data analysis. It will also be a valuable text to professional engineers in telecommunications and audio and signal processing industries.

Lte and Iot Systems and Signal Quality :

Author - Sivannarayana Nagireddi
Publisher - Createspace Independent Publishing Platform
Pages - 192
ISBN - 9781534630680


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Detail - The long-term-evolution (LTE) and Internet-of-Things (IoT) Systems and Signal Quality book presents a consolidated view and basic approaches to LTE and IoT systems, analysis and signal quality. This edition is especially low-priced through Amazon/CreateSpace print-on-demand approach that allows it to be affordable to more readers. In this book, several key topics are included on LTE and IoT systems, signal quality, analysis, basic mathematics and interpretations, illustrations, tabulated results, signal-quality relevance with 3GPP specifications, overall product architectural aspects, hardware, testing, and measurements for signal quality. The book systematically covers the following topics that span into 12-chapters: LTE system LTE UE hardware and interfaces Signal levels, PAPR, and crest factor LTE frequency and clock sources Frequency errors and signal quality Receiver I-Q impairments Transmitter I-Q imbalances-their estimation and cancellation Transmit gain management and time alignment Receiver AGC and blockers Signal-quality characteristics and measurements Radio link budget for LTE system IoT system and signal quality LTE and IoT systems and signal quality are a valuable resource that will benefit a broad spectrum of mobile/wireless engineers, from beginners to LTE and IoT test and system integration members, system engineers, hardware and firmware debugging teams, and product managers. This book is prepared with a blend of practical aspects, system analysis, signal-quality issues, and basic mathematics, with interpretation of the results in an easy way, including more than fifty figures and plots and more than twenty-five tabulated results with relevant easy interpretation notes. The easy interpretation and worked-out examples will also help the non-physical-layer members in getting a good overview of what is looked upon on the physical-layer side to improve the systems and signal quality. SIVANNARAYANA NAGIREDDI, PhD, is Technical Director, Mobile IoT at Sigma Designs Inc., California, USA, and leads the mobile IoT activity. Dr. Nagireddi actively contributed to LTE and mobile/wireless IoT development including multiple key activities of system architecture and simulations, system on chips (SoCs), hardware, customer facing product development, and system integration. He is the author of VoIP Voice and Fax Signal Processing, a book published by Wiley, USA.

VoIP Deployment For Dummies :

Computers

Author - Stephen P. Olejniczak
Publisher - John Wiley & Sons
Pages - 384
ISBN - 9780470440063


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Detail - So you’re in charge of implementing a VoIP phone system for your organization? VoIP Deployment For Dummies is a crash course in Voice over Internet Protocol implementation! Here’s how to analyze your network and implement a VoIP phone system, manage and maintain it, keep it secure, and troubleshoot problems. You’ll learn how to plan the rollout, work with Session Initiation Protocol (SIP), handle fax issues, and keep your users happy. Understand how VoIP works, common misconceptions about it, and the pros and cons for your organization Compare and comprehend hardware and software choices Discover the options for touch tones and faxing via VoIP systems Analyze network devices, IP addresses, connections to remote sites, and other aspects that will affect VoIP implementation Draw up a test plan, check out both voice and fax transmission, get a report, and schedule the installation Investigate SIP call generation, identify the elements, understand cancelled calls, and re-INVITE calls Troubleshoot your system, identify call variables, trace the source of a problem, manage trouble tickets, and resolve failures Manage latency, jitter, and flap, and take advantage of Wireshark Find out what to expect when your system goes live Written by an expert with extensive real-world experience in VoIP implementation and management, VoIP Deployment For Dummies provides the know-how you need. You’ll be able to implement your system and manage any issues proactively, which is sure to look good to your boss!

Beyond VoIP Protocols : Understanding Voice Technology and Networking Techniques for IP Telephony

Technology & Engineering

Author - Olivier Hersent, Jean-Pierre Petit, David Gurle
Publisher - John Wiley & Sons
Pages - 284
ISBN - 9780470023624


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Detail - In 1999-2000, VoIP (Voice-over-IP) telephony was one of the most successful buzzwords of the telecom bubble era. However, in 2001-2003, VoIP faced a very tough reality check. Now, manufacturers and service providers are drawing on what they have learnt from past experience in order to prepare to participate in the next major challenge faced by the telecommunications industry. This book offers a comprehensive overview of the issues to solve in order to deploy global revenue-generating effective "multimedia" services. Drawing on extensive research and practical deployment experience in VoIP, the authors provide essential advice for those seeking to design and implement a post-bubble VoIP network. Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony UL\ Introduces the basics of speech coding and voice quality Demonstrates how quality of service may be built into the network and deals with dimensioning aspects, e.g. multipoint communications and how to model call seizures. Explores the potential of multicast to turn an IP backbone into an optimized broadcast medium Includes amply illustrated, state-of-the-art practical advice for formulating a complete deployment strategy A companion volume to "IP Telephony: Deploying VoIP Protocols", this book takes the reader a stage deeper into how to prepare the network and exploit VoIP technology to its full potential.

Deploying Cisco Voice Over IP Solutions :

Computers

Author - Jonathan Davidson, Tina Fox, Phil Bailey
Publisher - Cisco Press
Pages - 579
ISBN - 9781587050305


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Detail - Written by Cisco "RM" CCIEs "TM, " Technical Marketing Engineers, and Systems Engineers who have real-life experience with Cisco "RM" VoIP networks, this guide includes coverage of Virtual Private Networks (VPNs), admission control, security, fax and modem traffic, and unified messaging. Learn from real-world scenarios.

Internet Telephony : Call Processing Protocols

Computers

Author - Uyless D. Black
Publisher - Prentice Hall
Pages - 373
ISBN - 9780130255655


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Detail - The key source for the principal Internet telephony services and standards. The Internet now handles extensive video, teleconferencing, fax, and voice communications, in addition to basic data transfer. But overlapping standards for mixed media transmissions can confuse even the most sophisticated engineers. Experienced telecom leader Uyless Black brings together all the tools and protocols for call processing in this single authoritative source. "Internet Telephony" begins with an overview of basic telephony call processing, focussing on the differences between traditional circuit switching and the more contemporary packet-based networks. A special section discusses telephony routing over IP. Along the way, Black explores the major standards and protocols in detail. Highlights include: H.323: the ITU standard for transmitting mixed media signals via LANS and WANs SIP: the IETF's Session Initiation Protocol used for IP teleconferencing Megaco Protocol: a combined IETF/ITU standard for multimedia conferencing MGCP: a call processing protocol, published as an informational RFC For engineers, managers, or users, Internet Telephony is the one book to cover all the technologies.

Microphone Arrays : Signal Processing Techniques and Applications

Technology & Engineering

Author - Michael Brandstein, Darren Ward
Publisher - Springer Science & Business Media
Pages - 398
ISBN - 3662046199


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Detail - This is the first book to provide a single complete reference on microphone arrays. Top researchers in this field contributed articles documenting the current state of the art in microphone array research, development and technological application.