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ATRAC3

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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.

ATRAC3plus
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 Memory Stick and OpenMG.
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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.
Sony HMD1G by Japan Inc.
RealNetworks also expects to provide integrated support for Sony's ATRAC3 codec technology, which will enable consumers to download and play ATRAC3- encoded music on PCs, as well as downloading such music to Sony's portable audio players packaged with OpenMG, like Memory Stock Walkman and VAIO Music Clip.
SONY, REALNETWORKS TEAM UP ON SECURE ELECTRONIC MUSIC DISTRIBUTION by EDP Weekly's IT Monitor
The Sony VGP-MR100 features include MPEG-1 and MPEG-2 ("Giga Pocket" or "Do VAIO"), DV-AVI and HDV file (camcorder files), WMV support for video files, ATRAC3, ATRAC3plus, WAVE, MP3 and WMA support for audio files, JPEG, GIF, PNG, TIFF and BMP support for image files, IEEE 802.
Sigma Designs Powers Sony's New Network Media Receiver; The Network ... by Business Wire
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