An introduction to digital media by Tony Feldman

By Tony Feldman

During this transparent and hugely available e-book, Tony Feldman offers an account of the evolution and alertness of electronic media. Clarifying its underlying applied sciences, he identifies its colossal advertisement and human power. utilizing as a place to begin a simplification which considers new media in special sectors; packaged "off-line" media reminiscent of CD-ROMs; and the area of transmitted media such as electronic broadcasting and interactive on-line companies, Feldman presents a finished evaluation of the electronic media panorama. targeting multimedia and the leisure media he describes and analyses the incredible upward push of CD-based details and the both progressive improvement of the net and on-line providers. Set inside of a advertisement context, readers can determine the aptitude to generate profit and cash in on the recent media. An creation to electronic Media concludes with a strategic review of the consequences of going electronic for people, businesses and companies.

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The simplest example of redundancy is to imagine a personnel record held in a computer system. If you use ‘M’ and ‘F’ to denote male or female in the gender field of the record, you require eight bits of data to represent either character. If you decide to replace the characters with an agreed, fixed-length one-bit code, you immediately achieve an eight to one compression of the gender field. This kind of simple redundancy occurs widely in databases and a significant level of compression can thereby be achieved through little more than an exercise of common sense and ingenuity.

We are moving towards a widely available facility to include full screen video on computer screens as naturally as we have come to expect it from television screens. Perhaps even more pressing a question now is how well such compression schemes will allow the easy transfer of video over computer networks relying on ubiquitous but inherently narrowband links such as telephone lines. MAVERICK COMPRESSION SCHEMES Despite improvements in the software-based schemes, they are principally a pragmatic solution to a commercial publishing problem rather than a realistic way of handling extreme video compression.

This relationship between the ease of compressibility and decompressibility is crucial to determining the commercial viability of compression schemes. MPEG, for example can now be compressed in real-time with fairly modest computers. This means that one hour of linear video will take an hour to compress. This makes MPEG nowadays a ‘symmetrical’ compression scheme. Asymmetric schemes like fractal compression are always less attractive because of the commercial need to get compression done quickly and cheaply.

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