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DTS-HD Master Audio
Is a lossless audio codec created by Digital Theater System. It was previously known as DTS and DTS-HD. It is an extension of DTS which, when played back on devices which do not support the Master Audio extension, degrades to a 1.5 Mbit/s "core" track which has loss. DTS-HD Master Audio is an optional audio format for both Blu-ray Disc and HD DVD.