DTS (also known as Digital Theater Systems), owned by DTS, Inc. (NASDAQ: DTSI), is a multi-channel digital surround sound format used for both commercial/theatrical and consumer grade applications. It is used for in-movie sound both on film and on DVD, and during the last few years of the Laserdisc format's existence, several releases had DTS soundtracks.
To convert from DTS audio, you will need to have DC Base decoder installed.
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