[opensource-dev] 3D soound

[Ardy Lay]

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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