Perceptual encoding
Perceptual encoding A compression technique for digitally recorded sound. Digital audio does not compress at all well using conventional 'non-lossy' schemes because there is very little redundancy in the data stream. Perceptual encoding techniques rely on extensive psycho-acoustic analyses of how the human ear and brain detect and interpret sound. In essence they manage to achieve high levels of compression by discarding elements of the sound that such analyses suggest cannot be heard. In this way they can reduce the data volume of the sound by a factor of 10 or more without obviously degrading the sound quality. Examples of perceptual encoding compression systems are Dolby Digital, DTS (although DTS claims that it first uses non-lossy compression techniques to reduce or eliminate the need for perceptual encoding), MP3, SDDS, Windows Media, RealAudio and ATRAC.
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