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Originally Posted by A.T. After reading this article at http://timefordvd.com/tutorial/DolbyHeadphone.shtml
....would have to re-create sounds coming from behind the listener. The front-to-back imaging is tricky when all you've got to work with are two headphone mini-speakers that are placed side-by-side.[/I][/COLOR] |
I wouldn't pay too much attention to statements like this. By the same argument, Dolby Headphone would not work at all and couldn't differentiate between front and surround speakers in a 5.1 setup. If you can hear surround sound with two ears, albeit on a movable head, then you should be able to reproduce it with headphones. There is no theoretical limit on the number of 'speakers' you could simulate other than the power of the DSP.
On Dolby Digital EX, the surround back channel is recorded into the Left and Right surrounds anyway so you still hear it. I've tried the THX test tones from a DD EX disk through my Pioneers and although they don't support EX per se, the tone for surround back did seem to be coming from 6 o'clock and was distinct from the surround left & rights. For DTS 6.1 Discrete, the surround back channel is probably ignored by the Dolby Headphone bit, but DTS 6.1 Matrix should work the same as DD EX.
I hope Dolby continue to develop Dolby Headphone to take advantage of the newer surround formats as they come along, as I said above there is no theoretical limit to the number of speakers it can simulate.