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(Adaptive TRansform Acoustic Coding3) An audio compression technology from Sony that provides multiple compression ratios depending on desired sound quality. At 132 Kbps, the music can be compressed to approximately 10% of the space used by a CD. Introduced on the MiniDisc in 1993, the original ATRAC format provided near CD quality sound, but ATRAC3, introduced in 1999, rivals the CD. ATRAC compression is 5:1; ATRAC3 is 10:1.

In 2002, Sony introduced ATRAC3plus, which provides a 20:1 compression ratio, bringing the data down to 5% of the original CD. It can achieve very high quality sound at 48 and 64 Kbps or be practically indistinguishable from the original at 256 Kbps. The CD data rate is 1,411 Kbps. See Sony Memory Stick and OpenMG.
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References in periodicals archive ?
6 ) ATRAC Advanced Lossless music server for high sound quality recordings (only for the AVIC-VH9900 and AVIC-ZH9900)
Other DRM technologies are much less popular and are (by order of popularity): Microsoft's PlayForSure, RealNetworks' Helix, Sony's ATRAC. These three DRM systems are able to protect both audio and video files.
Beta, mini-disc, umd, and atrac have all been huge flops, but they just don't seem to learn their lesson because they're too greedy." --
The PS3 can play back MP3, AAC, ATRAC and WAV files.
* Support for opening and rendering ATRAC3(TM), ATRAC3plus(TM), and ATRAC Advanced Lossless(TM) files, mono, stereo, and 5.1 surround
Sony Music could not very well support a Sony product that encouraged piracy, so it opted out of supporting MP3 and attempted to push ATRAC, its own copy-protected format.
Some previous models had been compatible only with Sony's proprietary Atrac format, which hit sales.
SONY PSYC ATRAC D-EJ100 Compact disc player Plays music for 45 hours on two AA batteries, plus it hooks up to Sony's online music store Just released
Its flotation collectors, marketed under the Atrac, Lilaflot, Armoflote, Armeen and Ethomeen brand names, are mainly used for the flotation of non-sulphide minerals such as apatite, barite, calcite, dolomite, feldspar, fluorspar, kyanite, magnesite, potash, pyrochlore, quartz, scheelite, wollastonite and zinc oxides.
Le salon, organise par l'Institut francais du Maroc en partenariat avec l'Association Tanger Region action culturelle (ATRAC), se veut l'occasion d'approfondir la reflexion sur la revolution numerique et son impact sur les industries culturelles mais aussi sur l'education, la recherche et la preservation du patrimoine.