Download e-book for iPad: Readings in Multimedia Computing and Networking (The Morgan by Kevin Jeffay, Hong Jiang Zhang

By Kevin Jeffay, Hong Jiang Zhang

Readings in Multimedia Computing and Networking captures the huge components of study and advancements during this burgeoning box, distills the foremost findings, and makes them obtainable to execs, researchers, and scholars alike. For the 1st time, the main influential and cutting edge papers on those subject matters are offered in a cohesive shape, giving form to the varied sector of multimedia computing. The seminal moments are recorded through a dozen visionaries within the box and every contributing editor offers a context for his or her region of analysis when it comes to a considerate, concentrated bankruptcy advent. the quantity editors, Kevin Jeffay and HongJiang Zhang, provide extra incisive interpretations of earlier and current advancements during this region, together with these inside media and content material processing, working platforms, and networking aid for multimedia. This publication gives you a valid realizing of the theoretical and useful concerns at paintings within the field's carrying on with evolution. * bargains an in-depth examine the technical demanding situations in multimedia and offers genuine and capability options that promise to extend the position of multimedia in enterprise, leisure, and education.* Examines partly One matters on the middle of multimedia methods: the ability through which multimedia information are coded, compressed, listed, retrieved, and another way manipulated.* Examines partially the lodging of those strategies through garage structures, working structures, community protocols, and applications.* Written by way of prime researchers, the introductions supply form to a box that's continuously defining itself and position the major examine findings in context to people who have to comprehend the state-of-the artwork advancements.

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13 E. Z w i c k e r a n d U. T. Z w i c k e r assumption that our auditory system analyzes a broad spectrum in parts that correspond to critical bands. Adding one critical band to the next, so that the upper limit of the lower critical band corresponds to the lower limit of the next higher critical band, produces the scale of the critical-band rate. Since critical bands have a 100-Hz width up to 500 Hz and above 500 Hz take a relative width of 20%, it becomes clear why the critical-band rate is dependent on frequency as illustrated.

We also do not perceive time directly; our perception is the subjective duration, often quite different from the physical du- 12 CHAPTER I Digital Audio equivalent scale, that is, the critical-band-rate scale, is used. Masking usually is described as the sound-pressure level of a test sound (a pure tone in most cases) necessary to be barely audible in the presence of a masker. For narrow-band noises used as maskers and pure tones used as test sounds, masking patterns can be produced for different center frequencies of the narrow-band noise maskers, as shown in Fig.

5 come closer together at higher 16 CHAPTER 1 Digital Audio levels. Besides the different exponents of the two loudness functions at higher levels it is also interesting to see that the loudness of uniform exciting noise is much larger than the loudness of the 1-kHz tone in almost the entire level range indicated. 5 times larger than the loudness of the 1-kHz tone with the same level. This difference is a very distinct effect, which plays an important role in judging and measuring the loudness of noises.

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