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Presentation1 - ECE 241 Multimedia Compression Jerry D....

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January 4, 2010 ECE 241 Multimedia Compression Jerry D. Gibson 1
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January 4, 2010 Typical Digital Communication System Source Physical Channel Demodulator Modulator Channel Decoder Channel Encoder Source Encoder Source Decoder User )} ( { n x )} ( { n y 2
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January 4, 2010 What is Compression? • Represent a source in digital form with as few bits as possible while still providing an acceptable reproduction of the original 3
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January 4, 2010 Synonyms for Data Compression • Signal Compression • Signal Coding • Source Coding • Source Coding with a Fidelity Criterion • Lossy (Noisy) Source Coding • Lossless (Noiseless) Source Coding • Data Compaction 4
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January 4, 2010 More Synonyms • Redundancy Removal • Bandwidth Compression 5
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January 4, 2010 Components of a Compression Problem • Source •R a t e • Distortion Measure • And Complexity 6
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January 4, 2010 Rate, Bits, and Bandwidth • Required network bandwidth set by transmitted bit rate • Bit Rate in bits/sec = bits/sample x samples/sec • Sampling rate determined by source bandwidth 7
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January 4, 2010 Major Steps in Data Compression 8
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January 4, 2010 Speech and Audio Coding Bandwidths
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Presentation1 - ECE 241 Multimedia Compression Jerry D....

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