VoIP Voice and Fax Signal Processing / Edition 1

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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.

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Product Details

  • ISBN-13: 9780470227367
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 10/6/2008
  • Edition number: 1
  • Pages: 550
  • Product dimensions: 9.30 (w) x 11.30 (h) x 3.80 (d)

Meet the Author

Sivannarayana Nagireddi, PhD, is the architect of VoIP solutions at Ikanos Communications, Inc., and leads the DSP and VoIP team. Dr. Nagireddi and his team developed complete VoIP solutions including signal processing algorithms for voice-enabled residential gateway processors, which have been deployed by telecommunications providers. He is a member of the IEEE, a Fellow of IETE-India, and reviewer for the journal Medical Engineering & Physics.
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Table of Contents

1 PSTN basic infrastructure, interfaces, and signals 1

2 VoIP overview and infrastructure 19

3 Voice compression 49

4 Generic VAD/CNG for waveform codecs 76

5 Packet loss concealment techniques 91

6 ECHO cancellation 113

7 DTMF detection, generation, and rejection 151

8 Caller ID features in VoIP 179

9 Wideband voice modules operation 203

10 Packetization - RTP, RTCP, and Jitter buffer 215

11 VoIP voice - network bit rate calculations 242

12 Clock sources for VoIP applications 257

13 VoIP voice testing 269

14 Fax operation on PSTN, modulations, and fax messages 282

15 Fax over IP and modem over IP 333

16 Fax over IP payload formats and bit rate calculations 371

17 Country deviations of the PSTN mapped to VoIP 393

18 Voice packets Jitter with large data packets 406

19 VoIP on different processors and architectures 414

20 VoIP voice quality 425

21 VoIP voice FAQs 464

22 Basic fax and fax over IP FAQs 484

Index 517

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