QDesign, named after the company of the same name, is an audio compression for QuickTime. QDesign relies on a model of psychoacoustics
. QDesign's audio compression is based on Parametric Stereo (PS), in which audio signals
areparametrically captured, decomposed into components, and the results are stored as coefficients.
There are several QDesign compression formats: QDesign Music and QDesign Music 2 Pro (QDX), which are used in QuickTime. QDX works with data rates of 64 kbit/s, has a higher sound quality than MP3 and copy protection.