Adaptive TRansform Acoustic Coding

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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.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
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DLNA media formats Media Required Optional Formats Imaging JPEG GIF, TIFF, PNG Audio (HND) LPCM MP3, WMA9, AC-3, AAC, (2 channel) ATRAC3plus Audio (MHD) MP3 and MPEG4 MPEG4 (HE AAC, AAC LTP, BSAC), AAC LC AMR, ATRAC3plus, G.726, WMA, LPCM Video (HND) MPEG2 MPEG1, MPEG4, WMV9 Video (MHD) MPEG4 AVC (AAC VC1, H.263, MPEG4 part 2, MPEG2, LC Assoc.
The product also comes with a USB host plug enabling the user to plug in and play MP3 and Atrac3plus files.
* Still capable of playing back discs in the old MD format, Hi-MD players use ATRAC3 (65, 105 and 132kbps), ATRAC3plus (48,64 and 256kbps) and Linear PCM Codecs, representing a genuine step forward for the format.