Robert Greene wrote:
I think one has to distinguish here various factors.
First of all, if one subtracts the effects of head movements
on perception and also assumes that the listener is
willing to keep their head absolutely still, then
there would seem to be no problem with producing any
sound one cared to at the entrances to the two ear canals.
This will produce if properly done the effect of headphones,
and as I suppose everyone has experienced, headphones
can indeed produce the effect of a fly buzzing around your head
and so on. (cf the "Oscar" experiments of Sennheiser).
Robert:
I think you are right, in theory. But in practice, there will be certain
artifacts!
The X-talk cancellation itself is not perfect, and it is hard to have
some real "perfect" solution.
The loudspeakers will show phase errors, and different behaviour at
different frequencies. There will be room reflections. The room
reflections will depend on the spacial/directional behaviour of the
loudspeakers. (You will move your head, but you shouldn't. :-) )
I probably forgot a lot of things...
Now, to the practical test:
http://www.studio360.org/2011/apr/29/adventures-3d-sound/
I have listened to the "3D Audio Demonstration for Speakers" on my
laptop, and I can't say there is any real "3D effect" here. There is
some confusing (I am serious!) sound "in front" or "under" me, and maybe
I am at the same time within "something". But nothing comes ever from
"behind" me, and there is nothing whatsoever "up".
The bird in the end is especially interesting, because the position
seems to shift during a frequency shift. (The sound shifts to the right
when the frequency is dropping. This is what I am hearing, so this might
be a subjective test result...)
I would say that this is an interesting demo, but nothing "commercial"
at all. It is also very possible that different people will hear
something quite different here. But if so, this is not any "stable"
sound presentation at all.
Even SRS TruSuround seems to be a lot better than this supposed new and
"super" technology, but maybe I am wrong on this.
I didn't listen to the headphone demo yet, which should be a lot better.
(Well, I hope so.)
Best,
Stefan
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