By Richard Schaphorst
ISBN-10: 0890069972
ISBN-13: 9780890069974
ISBN-10: 1580532403
ISBN-13: 9781580532402
This article presents a close precis of rising criteria for audio-visual platforms and multimedia purposes. It bargains info on video and speech coding recommendations coupled with huge insurance of criteria for verbal exchange of multimedia indications. The textual content information compression innovations and criteria, and addresses the applied sciences of video and audio compression, facts verbal exchange protocols, electronic television, and electronic audio and multimedia. during this moment version, info is on the market at the H.324M regular for transmitting multimedia signs over cellular networks, and info on complicated coding criteria resembling H.263 and MDEG-4.
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Extra info for Videoconferencing and Videotelephony: Technology and Standards (Artech House Telecommunications Library)
Example text
97 Hz Page 26 entertainment quality TV. This resolution is suitable for single-person conferences, where only the head and shoulders of one person are shown. For graphics, QCIF can be used only for very simple viewgraphs that have at most seven lines of text. 261 codecs are required to have QCIF, even if they have CIF capability, so it provides a fall-back mode that will work between all types of codecs. Even if a codec has CIF capability, most codecs provide a feature that forces operation at QCIF if it is desired to improve frame rate or to economize on bit rate.
Artech House cannot attest to the accuracy of this information. Use of a term in this book should not be regarded as affecting the validity of any trademark or service mark. S. 2 Recommendation T. 3 Recommendation T. 4 Recommendation T. 6 Recommendation T. 6 The JBIG Coding Algorithm 267 Acronyms and Abbreviations 269 Glossary 275 About the Author 287 Index 289 Page xiii Acknowledgments This book frequently references telecommunication standards that have been, and are continuing to be, developed by the ITU and ISO standards organizations.
This old saying not only gives the justification for teleconferencing but also states the fact that a picture contains much more information than the spoken word. Transmission of such information between distant locations requires an electronic highway that is wide enough to handle all required information. Greater width translates into higher cost. Therefore, in the past, pictorial transmission could be economically justified only for high-value applications such as TV broadcasting. Even though recent developments in transmission technology have considerably reduced this cost factor, it is likely to remain important for many years to come.
Videoconferencing and Videotelephony: Technology and Standards (Artech House Telecommunications Library) by Richard Schaphorst
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