Digital Theater Systems sound: Discrete 5.1 channel surround system that is similar but not the same as Dolby Digital. Dolby Digital is the DTV standard, but DTS competes with it on DVD and in movie theaters.
DTS-HD Master Audio is a “lossless” multi-channel audio encoding method similar to Dolby® TrueHD. It is used on many Blu-ray discs, since it can default to standard DTS on systems that cannot support DTS-HD Master Audio.

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