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Author: Mohammed Ghanbari
Publisher: IET
Published: 2003
Total Pages: 430
ISBN-13: 0852967101
DOWNLOAD EBOOK →This book discusses the growth of digital television technology and the revolution in image and video compression (such as JPEG2000, broadcast TV, video phone), highlighting the need for standardisation in processing static and moving images and their exchange between computer systems.
Author: Iain E. Richardson
Publisher: John Wiley & Sons
Published: 2002-05-22
Total Pages: 318
ISBN-13: 9780471485537
DOWNLOAD EBOOK →Codec-Algorithmen werden zur Kodierung und Dekodierung (oder Komprimierung und Dekomprimierung) von Daten wie Videofilmen benutzt, ohne daß die visuelle Qualität des dekodierten Bildes beeinträchtigt wird. Bekannt sind zum Beispiel Codecs zur Konvertierung von analoger Videosignale in komprimierte Videodateien wie MPEG. Dieses Lehrbuch vermittelt Ihnen einen Überblick über einschlägige Standards und Technologien, der Schwerpunkt liegt auf Fragen des Designs. Einleuchtende qualitative und quantitative Vergleiche von Systemalternativen werden anhand von Fallstudien vorgenommen.
Author: Eric Coll
Publisher: Teracom Training Institute
Published: 2023-02-09
Total Pages: 68
ISBN-13: 1988138248
DOWNLOAD EBOOK →Voice Packetization, Codecs and Voice Quality The "nuts and bolts" of Voice over IP: • How voice is digitized and coded, • Time stamps applied with the RTP protocol, and • How the result is carried in UDP, IP packets and MAC frames. You'll learn about codecs and compression, and understand factors like delay, jitter and packet loss, what causes them, and how they affect sound quality. VoIP Module 4 Detailed Outline 4. Voice Packetization, Codecs and Voice Quality 4.1 Voice Packetization ...... 4.1.1 Microphone Produces a Voltage Analog ...... 4.1.2 Digitization ...... 4.1.3 Coding ...... 4.1.4 Segmentation and Packetization 4.2 Measuring Voice Quality ...... 4.2.1 Mean Opinion Score ...... 4.2.2 Toll-Quality Speech 4.3 Factors Affecting Voice Quality ...... 4.3.1 Codec, Delay, Jitter and Packet Loss ...... 4.3.2 Network Load 4.4 Codecs and Compression ...... 4.4.1 Coder / Decoder ...... 4.4.2 Tradeoffs ...... 4.4.3 CBR vs. VBR ...... 4.4.4 Standards 4.5 Delay ...... 4.5.1 Coding Delay ...... 4.5.2 Network Delay ...... 4.5.3 Design Goal 4.6 Jitter ...... 4.6.1 IP: No Guarantees ...... 4.6.2 Variable Delivery Time ...... 4.6.3 Variable Network Loading ...... 4.6.4 Jitter Buffer 4.7 RTP ...... 4.7.1 Real-Time Transport Protocol ...... 4.7.2 Segmentation ...... 4.7.3 Time Stamp ...... 4.7.4 Error Recovery 4.8 VoIP Protocol Stack: RTP, UDP, IP, MAC ...... 4.8.1 Moving the RTP PDU ...... 4.8.2 UDP Error Detection and Recovery ...... 4.8.3 Port Number ...... 4.8.4 RTP/UDP/IP/Ethernet Protocol Stack ...... 4.8.5 Header Compression 4.9 Packet Loss ...... 4.9.1 Packet Loss Mechanism ...... 4.9.2 Recovery 4.10 Tips for Maximizing Voice Quality ...... 4.10.1 Network Level Testing ...... 4.10.2 VoIP Application Level Testing ...... 4.10.3 Strategies
Author: Bruce Hartpence
Publisher: "O'Reilly Media, Inc."
Published: 2013
Total Pages: 243
ISBN-13: 1449339670
DOWNLOAD EBOOK →"A system administrator's guide to VoIP technologies"--Cover.
Author: Frank Ohrtman
Publisher: McGraw Hill Professional
Published: 2002-12-31
Total Pages: 384
ISBN-13: 0071501169
DOWNLOAD EBOOK →Bypassing the old circuit-switched hardware, softswitches streamline message traffic and provide a much more efficient service development environment. Along with SIP, this technology leverages Internet technologies to replace plain-old-telephone service. Developers who are freed up by softswitch technology to build cost-effective 3G serives will learn how it works and what applications it can support. Network managers making hard decisions about whether to deploy VoIP will learn pros and cons, costs and benefits, and most importantly how to separate myth from reality.
Author:
Publisher:
Published: 1993-10-11
Total Pages: 60
ISBN-13:
DOWNLOAD EBOOK →For more than 20 years, Network World has been the premier provider of information, intelligence and insight for network and IT executives responsible for the digital nervous systems of large organizations. Readers are responsible for designing, implementing and managing the voice, data and video systems their companies use to support everything from business critical applications to employee collaboration and electronic commerce.
Author: Ben Waggoner
Publisher: Taylor & Francis
Published: 2013-02-11
Total Pages: 679
ISBN-13: 1136064532
DOWNLOAD EBOOK →Learn how to compress video and audio with optimal quality and minimal hassles. Renowned expert Ben Waggoner teaches you to improve the quality of your final content and develop effective workflows. Understand the basic concepts of vision and hearing, apply that knowledge in the context of compression, then move onto practical, applicable information for creating, editing, and compressing the best video and audio, whether you're delivering for the web, DVD, Blu-ray, phones, or beyond. Clear examples of how to make the best choices in real-world projects Covers Mac and Windows products for a complete look at today's compression technologies: all the different tools, codecs, and formats for different kinds of deliverables are described, focusing on how to pick the right options for particular projects, players, and sources Formats Windows Media QuickTime Flash FLV and F4V MPEG-4 and H.264 MPEG-2 Ogg Vorbis and Theora Silverlight and Smooth Streaming Devices iPod and iPhone Zune HD Playstation Portable Playstation 3 Xbox 360 DVD and Blu-ray
Author: Angie Taylor
Publisher: CRC Press
Published: 2013-10-28
Total Pages: 597
ISBN-13: 1136143580
DOWNLOAD EBOOK →Realize your creative potential with a working knowledge of After Effects 7. Renowned artist and designer Angie Taylor demonstrates professional workflows and inspires with practical tutorial lessons that help put the theory (and you!) to work. You'll learn from a comprehensive survey of the new interface and features, with illustrated techniques for animation, visual effects and motion graphics. Practice exercises to reinforce essential techniques, and continuous projects challenge you with fantastically creative uses of the application. The companion DVD includes everything you'll need to complete the tutorials as well as an array of bonus plug-ins and demo software.
Author: Sivannarayana Nagireddi
Publisher: John Wiley & Sons
Published: 2008-10-03
Total Pages: 592
ISBN-13: 0470377860
DOWNLOAD EBOOK →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.
Author: Steven Gulie
Publisher: Elsevier
Published: 2003-10-02
Total Pages: 872
ISBN-13: 0080489583
DOWNLOAD EBOOK →QuickTime is the industry standard for developing and distributing multimedia content on the Web and CD-ROM, for both Windows and Macintosh computers. This book includes QuickTime Pro 6 and a full set of content development tools for both Windows and Macintosh developers. This third edition of the best-selling and award-winning QuickTime for the Web is a hands-on guide showing how to integrate animation, video, recorded sound, MIDI, text, still images, VR, live streams, games, and user interactivity into a Web site. It now also covers how to benefit from QuickTime support for the MPEG-4 global multimedia standard. Written for Web masters, site designers, HTML and multimedia authors, and anyone else who wants to incorporate sound or video into their Web site, this book offers clear and detailed instruction in an engaging style. Written by an expert at Apple Computer, this is the most complete and authoritative source for creating QuickTime content for the Web. The first edition of this book won the Touchstone 2000 Merit Award for Books awarded annually by STC (Society for Technical Communications). Written for both Windows and Macintosh developers. Illustrates all the latest features in QuickTime Pro 6, including MPEG-4 support.
