gibson j.d. multimedia communications

[...]... Wireless Communications and Computer Systems Laboratory, Department of Computer Science and Engineering, University of California, San Diego xviii CHAPTER 1 Multimedia Communications: Source Representations, Networks, and Applications JERRY D GIBSON 1.1 INTRODUCTION Universal access to multimedia information is now the principal motivation behind the design of next-generation computer and communications. .. This page intentionally left blank Preface This book is a collection of invited chapters on multimedia communications contributed by experts in the field We use the term multimedia communications to encompass the delivery of multiple media content such as text, graphics, voice, video, still images, and audio over communications networks to users Note that several of these media types may be part of a... videoconferencing or telephony, as well as asymmetric communications situations, 1 CHAPTER 1 /MULTIMEDIA COMMUNICATIONS Access Network Destination Terminal Delivery Network FIGURE 1.1 Components of a multimedia communications network such as broadcasting or video streaming In Figure 1.1, the Source consists of any one or more of the multimedia sources, and the job of the Source Terminal is to compress the Source... Task Force (IETF) meetings, among other multimedia applications Although multimedia applications may have their own protocols, recently the IETF has developed a protocol for multimedia communications called the Real-time Transport Protocol (RTF) and its associated control protocol, Real-time Transport Control Protocol (RTCP) The fundamental goal of RTP is to allow multimedia applications to work together... breaks the multimedia communications problem down into the components shown in Figure 1.1 Components shown there are the Source, the Source Terminal, the Access Network, the Backbone Network, the Delivery Network, and the Destination Terminal This categorization allows us to consider two-way, peer-to-peer communications connections, such as videoconferencing or telephony, as well as asymmetric communications. .. in conjunction with text or graphical data The topics covered in the book were carefully selected to provide critical background material on multimedia communications and to expose the reader to key aspects of the hottest areas in the field Chapter 1, Multimedia Communications: Source Representations, Networks, and Applications, provides a context for the rest of the book, but each chapter is intended... of times the single link bandwidth; VDSL, very high rate digital subscriber line CHAPTER 1 /MULTIMEDIA COMMUNICATIONS at 28,8 Kbit/s up to 56 Kbit/s While relatively low speed by today's standards and for the needs of multimedia, these connections are reliable for data transmission For transporting compressed multimedia, however, these lower speeds can be extremely limiting and performance limitations... heightened public expectations, and lucrative entrepreneurial opportunities In this chapter and in this book as a whole, we are interested in multimedia communications; that is, we are interested in the transmission of multimedia information over networks By multimedia, we mean data, voice, graphics, still images, audio, and video, and we require that the networks support the transmission of multiple... that H.323 has become very popular for Internet multimedia applications, especially Internet telephony 1.3 MULTIMEDIA SOURCES Now that we have some idea of network bandwidths (or rates), services, and protocols, we examine how these network capabilities match the multimedia sources that we wish to transmit through the networks Table 1.2 lists several common multimedia sources, their bandwidths, the common... object-based audio-visual representation) and MPEG-7 (for multimedia content description interface), which will be important to multimedia communications over networks, and these are discussed in Chapter 8 1.4 SOURCE AND DESTINATION TERMINALS In this chapter, we use the word terminal to refer to any device that connects a user to the network For voice communications over the PSTN, the terminal may simply . Press The chapter " ;Multimedia Conferencing Standards" by David Lindbergh is reprinted from Digital Compression for Multimedia: Principles and Standards by Jerry Gibson, Toby Berger, . and Juanita Ellis Multimedia Communications Directions and Innovations JERRY D. GIBSON, EDITOR Department of Electrical Engineering Southern Methodist University Dallas, Texas ® ACADEMIC. technologies and services, compression standards, video-on-demand, IP telephony, wideband wireless data, IP over wireless, transcoding of multimedia content, and multicasting. It would be difficult