Don't forget time difference of arrival of sounds at both ears is what
we use to place a sound in the space around us. Amplitude is much less
important than the L-R "dual mono" crowd would have you believe. If a
sound is only heard by one ear, you can't place it, so it goes inside
your head, at the ear that heard it. I see no use for synthetic
differencing here.
On 5/24/2011 12:42 PM, Lee ponzu wrote:
I saw this cool demo of 3D sound. This is totally different from the
SL Voice technology, and I think it would compliment it perfectly.
Take a look...
http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=princeton+3D+sound
<http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=princeton+3D+sound>
The basic idea is that stereo gives a weak illusion of 3D. You have
the left signal, ls, and the right signal, rs. A filter computes
rs_new = rs - ls
ls_new = ls - rs
and then play rs_new and ls_new. (Details left as an exercise...)
In English---when you record in stereo, you record cross talk between
the mics which is recreated when you play back. This idea removes the
cross talk, and dramatically increases the 3D illusion. It is a
simple filter and works totally at playback time on all sound sources
and any stereo recording. It would be easy to add it to the viewer...
Just an idea.
ponzu
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