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Originally Posted by markus767
Where did you get that information from?
It's the basic tenant of Dolby and DTS's codecs. DTS started using this feature back in the DVD days with DTS-ES Discrete 6.1. The left and right surround speakers in the 5.1 "core" contained the same sound information that was included in the extra discrete back channel. So, if you played the track with a regular DTS 5.1 decoder, you didn't automatically lose the audio information by losing the back surround channel in the extension file. However, once you ran the track through a DTS-ES decoder it would combine the 5.1 core plus the sixth discrete back channel. In order to get rid of the duplicated audio in the left and right surrounds, the sounds from the sixth channel were run inversely and were knocked out of the left and right surrounds... and you only heard them out of the added back surround channel.
Dolby also does this with TrueHD when adding back surround channels to their 5.1 core to make it 7.1. There are basically two mixes in one, so the same inverse sound wave technique is implemented.
Listen up, studios! Just say "NO" to DNR and EE!!
Last edited by Dan Hitchman; 07-09-2014 at 03:13 PM.