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ATRAC3Adaptive Transform Acoustic Coding 3 (Sonys audio compression technology)
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In addition it has an audio player that allows users to listen to ATRAC3 and MP3 audio via external speakers or the supplied headphones.
RealNetworks plans to integrate support for Sony music technologies into RealJukebox, including ATRAC3, its sound compression format, as well as OpenMG copyright protection technology, the Sony Memory Stick and its portable audio players such as "Memory Stick Walkman" and "VAIO Music Clip." The enhancement to RealJukebox is expected to ship in the summer, and will be designed for use with "OpenMG" on PCs to comply with SDMI (Secure Digital Music Initiative) requirements for copyright management.
Anyway, got to snap out of it and get down to details: 256 MB of onboard memory means up to 11 hours and 40 minutes of ATRAC3 musical bliss and much more if you take advantage of the player's Memory Stick Duo slot.