(Adaptive Transform Acoustic Coding) ATRAC (Adaptive Transform Acoustic Coding) is a data-compression process developed by Sony for MiniDisc use. Only the sound components detectable by the human ear are recorded, enabling a 64 mm diameter disc to store 80 minutes of high-quality stereo audio.
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ATRAC is an abbreviation for Adaptive Transform Acoustic Coding, and is the digital audio encoding method used in minidiscs. The algorithm divides the 16 bit 44.1 KHz digital signal it receives into 52 sub-bands in the frequency domain (after a Fast Fourier Transform). A psycho-acoustic transfer function that takes advantage of the masking effect a
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