DSEE
Digital sound enhancement engine (DSEE) is a sound quality improvement technology, developed by Sony for playing lossy compressed music files. == Variants == === DSEE === Introduced in 2006, DSEE is included in Sony's digital Walkman products and freeware SonicStage CP (version 4.2 or higher), x-app, and Music Center for PC. In operation, it analyzes irreversibly compressed music files such as MP3, ATRAC3, AAC, and WMA, and performs predictive calculations to compensate for high-frequency sounds lost due to compression, thereby improving sound quality.