Adaptive TRansform Acoustic Coding

algorithm (ATRAC) An audio compression algorithm,

introduced by Sony for its Mini Disk, which relies on the

masking of low-amplitude frequency components by temporaly

adjacent high-amplitude components. ATRAC consists of a

three-band subband encoder (0...5.5, 5.5...11, 11...22 kHz)

and a MDCT based transformation encoder.

[Does Sony Minidisk use ADPCM?]

(2001-12-13)