Dale - Computer Science Illuminated 100

Dale - Computer Science Illuminated 100 - 3.5 Representing...

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3.5 Representing Images and Graphics 73 Currently, the dominant format for compressing audio data is MP3. The popularity of MP3 resulted mostly from a stronger compression ratio than others available at the time. Other formats may prove more efficient in the future, but for now MP3 is the general favorite. In mid–1999 the term “MP3” was searched for more than any other term and is still going strong today. Let’s look at the details of the MP3 format a little more closely. The MP3 Audio Format MP3 is short for MPEG–2, audio layer 3 file. MPEG is an acronym for the Moving Picture Experts Group, which is an international committee that develops standards for digital audio and video compression. MP3 employs both lossy and lossless compression. First it analyzes the frequency spread and compares it to mathematical models of human psychoacoustics (the study of the interrelation between the ear and the brain), then it discards information that can’t be heard by humans. Then the bit stream is compressed using a form of Huffman encoding to achieve
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This note was uploaded on 01/13/2011 for the course CSE 1550 taught by Professor Marianakant during the Fall '10 term at York University.

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