perceptual audio coding - Computer Definition
A family of techniques for compressing digital audio based on the human perception of sound (psychoacoustics). Frequencies that are too low or too high are eliminated as well as soft sounds that are drowned out by loud sounds. For example, when several musical instruments are playing simultaneously, depending on frequency and volume at any given moment, the sounds from one instrument can cancel out the sounds of another. See subband coding, audio codec and speech codec.