VoIP Voice and Fax Signal Processing

Transcription

1 Brochure More information from VoIP Voice and Fax Signal Processing Description: 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. Contents: Acknowledgments xix

2 About the Author xxi Preface xxiii Glossary xxvii 1 PSTN Basic Infrastructure, Interfaces, and Signals PSTN CO and DLC PSTN User Interfaces Data Services on Telephone Lines Power Levels and Digital Quantization for G.711 A Law Significance of Power Levels on Listening TR 57, IEEE 743, and TIA Standards Overview 13 2 VoIP Overview and Infrastructure PSTN and VoIP Typical VoIP Deployment Example Network and Acoustic Interfaces for VoIP VoIP Systems Working Principles VoIP Signaling 41 3 Voice Compression Compression Codecs G.711 Compression Speech Redundancies and Compression G.726 or ADPCM Compression Wideband Voice G.729 Family of Low Bit Rate Codecs Miscellaneous Narrow and Wideband Codecs Codecs and Overload Levels Voice Quality of Codecs C Source Code for Codecs Codecs in VoIP Deployment 74 4 Generic VADCNG for Waveform codecs VADCNG and Codecs Generic VADCNG Functionality 78

3 4.3 Comfort Noise Payload Format G.711 Appendix II VADCNG Algorithm Power Based VADCNG VADCNG in Low Bit Rate Codecs Miscellaneous Aspects of VADCNG Summary on VADCNG 89 5 Packet Loss Concealment Techniques Packet Loss Concealment Overview Packet Loss Concealment Techniques Transmitter and Receiver Based Techniques Decoder Only Based PLC Techniques PLC Techniques Description PLC for Low Bit Rate Codecs PLC Testing PLC Summary and Discussion ECHO Cancellation Talker and Listener Echo in PSTN Voice Call Naming Conventions in Echo Canceller Line and Acoustic Echo Canceller Talker Echo Levels and Delay Echo Cancellation in VoIP Adapters Echo Path Adaptation Filtering Algorithms Echo Canceller Control Functions Echo Cancellation in Multiple VoIP Terminals Echo Canceller Testing DTMF Detection, Generation, and Rejection Specifications of DTMF Tones DTMF Tones Generation DTMF Detection Goertzel Filtering with Linear Filtering Tone Detection Using Teager and Kaiser Energy Operator 167

4 7.6 DFT or FFT Processing DTMF Rejection DTMF RFC2833 Processing DTMF Testing Summary and Discussions Caller ID Features in VoIP FSK Caller ID on PSTN FSK Caller ID Data Transport Protocol DTMF Based Caller ID Country Specific Caller ID Overview Caller ID in VoIP Call Wait Caller ID Caller ID on FXO Interfaces Summary and Discussions Wideband Voice Modules Operation Wideband Voice Examples Wideband VoIP Adapter Wideband Voice Summary Packetization RTP, RTCP, and Jitter Buffer Real Time Protocol (RTP) RTP Control Protocol (RTCP) VoIP Packet Impediments Jitter Buffer Adaptive Jitter Buffer Adapting to Delay Variations AJB Algorithms Overview Adaptive Jitter Buffer Implementation Guidelines Fixed Jitter Buffer Implementation Guidelines VoIP Voice Network Bit Rate Calculations Voice Compression and Bit Rate Overview Voice Payload and Headers 244

5 11.3 Ethernet, DSL, and Cable Interfaces for VoIP VoIP Voice Packets on a DSL Interface VoIP Voice Packets on a Cable Interface Bit Rate Calculation for Different codecs Bit Rate with VADCNG Bit Rate with RTCP, RTCP XR, and Signaling Summary on VoIP Bit Rate Clock Sources for VoIP Applications PSTN Systems and Clocks VoIP System Clock Options Clock Timing Deviations Relating to VoIP Packets Measuring Clock PPM Clock Drift Influence on Voice and Fax Calls VoIP Voice Testing Basic Test Setup First Level VoIP Manual Tests Analog Front End Voice Transmission Tests Telephone Line Monitor for Tones and Timing Characteristics MOS PSQM, PAMS, and PESQ Measurements Bulk Calls for Stress Testing Network Impediments Creation VoIP Packets Analysis Compliance Tests VoIP Interoperability Deployment Tests Voice Quality Certifications VoIP Speech Quality Tests by the ETSI User Operational Considerations Fax Operation on PSTN, Modulations, and Fax Messages Fax Machine Overview Fax Image Coding Schemes Fax Modulation Rates 290

6 14.4 PSTN Fax Call Phases Fax and Modem Tones Basics Tones Detection Fax Modulations and Demodulations V.21 Fax Modem V.27ter Fax Modem V.29 Modem V.17 Modem V.34 Fax Modem V.21 HDLC Framing and Deframing HDLC Messages in ECM Summary and Discussions on Fax Fax Over IP and Modem Over IP Fax over IP Overview Fax over IP Benefits Fax Basic Functionality and Detecting Fax Call T.38 Fax Relay Fax Pass Through Fax over IP Interoperability Challenges Modem Basic Functions on PSTN Migrating Modem Functions to IP Guidelines for Fax and Modem Pass Through in VoIP VoIP Fax Tests Fax Over IP Payload Formats and Bit Rate Calculations Overview on T.38 and G.711 Pass Through Bit Rate G.711 Fax Pass Through Bit Rate T.38 Basic Payload Bytes for V.27ter, V.29, V.17, and V Overview on Redundant and Duplicate Fax Packets T.38 IFP Packets IFP over TCP (TCPIPIFP) IFP over UDP 382

7 16.8 T.38 UDPTL Based Bit Rate Calculation with Redundancy Fax UDPTL Based Bit Rate on Ethernet and DSL Interfaces T.38 Bit Rate Recommendations Country Deviations of the PSTN Mapped to VoIP Country Specific Deviations Country Specific Deviations on VoIP Interfaces Call Progress Tones for Multiple Countries Call Progress Tone Detectors Voice Packets Jitter with Large Data Packets ATM Cells and Transmission IPQoS and Queuing Jitter on an Interface VoIP on Different Processors and Architectures VoIP on Personal Computers VoIP on PC Add On Cards VoIP on Dedicated Processors Operating System Aspects on Different Platforms Voice Processing Complexity VoIP Voice Quality Voice Quality Measurements E model Based Voice Quality Estimation VoIP Voice Quality Considerations VoIP Voice Quality Summary Voice Quality Monitoring and RTCP XR Summary and Discussions VoIP Voice FAQs Basic Fax and Fax Over IP FAQs 484 Index 517 Ordering: Order Online - Order by Fax - using the form below Order by Post - print the order form below and send to Research and Markets,

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