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== What is Perceptual Audio Coding? ==
Perceptual Audio Coding, also known as PAC is a technique that compresses the digital sound by eliminating frequencies that cannot be perceived by the human ear. PAC decodes the bit stream that sounds just like the original audio, but keeping the compressed file small. PAC used the psychoacoustic algorithms.
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*http://www.harmoniccycle.com/hc/music-mp3-info-fraubasic.htm
*http://www.telecomabc.com/p/perceptual.html
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