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Doesn't some of the DD/DTS 5.1 downmix to 2ch while preserving the surround information?

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lwang

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In Reply to: Check the DVD set-up menu. posted by R. Hertz on December 20, 2002 at 06:48:01:

By doing some sort of ( Surround L + Surround R ) / 2 and placing it in the L & R channel, with one of the signal's phase inverted. This way, the information could be extracted by DPL processors.
I presume they are already doing it for the center channel, or else dialogue would never be present in DD/DTS 5.1 via analog 2ch output.

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The Dobly processor can do a variety of functions, - R. Hertz 09:13:58 12/21/02 (0)
...depending on the source material. It can synthesize som ambient information from stereo recordings and create an ersatz surround sound. The Dolby website has lots of info, much of it over my head. Here's the link:
- Dolby Labs

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