Download Broadband Last Mile: Access Technologies for Multimedia by Nikil Jayant PDF

By Nikil Jayant

Broadband final Mile: entry applied sciences for Multimedia Communications presents in-depth remedies of entry applied sciences and the functions that depend on them or help them. It examines techniques and improvements alongside a number of dimensions in entry, with the overarching aim of making sure that the final mile isn't the susceptible hyperlink within the broadband chain. Written by way of specialists from the educational and advertisement segments of the sector, the book's self-contained sections handle issues concerning the disciplines of communications, networking, computing, and sign processing.The center of this therapy includes modern reports of broadband pipes within the sessions of copper, cable, fiber, instant, and satellite tv for pc. It emphasizes the coexistence of those periods inside a community, the significance of optical communications for unparalleled bandwidth, and the flexibleness and mobility supplied via wireless.The publication additionally contains point of view at the more and more very important subject of community administration, delivering insights which are real whatever the nature of the pipe. The textual content concludes with a dialogue of newly rising purposes and broadband services.This booklet bargains an all-in-one therapy of the actual pipes and community architectures that make wealthy and more and more customized functions attainable. It serves as a beneficial source for researchers and practitioners operating within the more and more pervasive box of broadband.

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Extra resources for Broadband Last Mile: Access Technologies for Multimedia Communications (Signal Processing and Communications)

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28 An important note is that lossless compression of natural images typically achieves a compression ratio of less than 2:1; non-natural images such as computer graphics or text can achieve much higher compression ratios. The newest image compression standard, JPEG-2000, was designed to provide improved compression performance and new functionalities compared to the original JPEG standard. Specifically, JPEG-2000 was designed to provide high compression performance; various forms of scalability, including bit rate scalability, spatial resolution scalability, and SNR (amplitude resolution or quality) scalability; and support high bit rates up to lossless compression, large bit depths per pixel, many color components (for multispectral imaging), random access, and error resilience.

Although a large number of compression algorithms have evolved for multimedia signals, they all depend on a handful of techniques that will be mentioned in the sections to follow. In turn, these techniques perform no more than two fundamental tasks: removal of (statistical) redundancy and reduction of (perceptual) irrelevancy. The fundamental operation of signal prediction performs the first function of removing redundancy, regardless of the signal-specific methods of performing prediction (in time and/or frequency domains).

A prime example occurs when media are precompressed and stored, such as for video on demand (VoD), and the original compressed bit rate is larger than the available channel bandwidth. Three approaches to adapt the compressed media to match the available channel bandwidth are through the use of transcoding, multiple-file switching, and scalable coding. Transcoding. A conceptually straightforward approach to reduce the media bit rate is to decode and then re-encode the media at the desired bit rate.

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