This sound reduction technology can achieve roughly twice (1:10) the data reduction rate of the ATRAC sound data reduction (1:5) used for the MiniDisc.
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http://www.encyclo.co.uk/visitor-contributions.php
ATRAC (Adaptive Transform Acoustic Coding) is a data-compression process developed by Sony for MiniDisc use. Only the sound components detectable by the human ear are recorded, enabling audio data to be stored more efficiently. ATRAC3 can achieve roughly twice the data reduction of the ATRAC format, making it suitable for high-efficiency audio stor...
Found on
http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
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