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Computing (FOLDOC) dictionary
Adaptive TRansform Acoustic Coding
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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.