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At 11:49 PM +0200 6/28/01, Junkie G wrote: > i think this conceptual matter is > not yet clear for me ... > what we understand by 3D Audio ? "3D audio" or "3D sound" are probably bad terms because they are used by different people to mean different things. If we use a visual analogy, 3D sound should probably mean sound in three dimensions as represented by an XYZ coordinate system. That would mean that binaural headphone sound or sound coming from a stereo pair of loudspeakers would be one-dimensional sound, and a standard 5.1 planar setup would be two-dimensional sound. Only if we add overhead speakers would we truly have three-dimensional sound. Of course the situation is confounded when we add artificial reverberation or related processing to the signal, because this is an attempt to simulate spatial depth. However, even with very good psychoacoustic processing it is only a simulation of two-dimensional sound using a one-dimensional delivery system (I have yet to hear a convincing illusion of height from a binaural or even a surround system). Therefore I think it's better to talk about "multichannel surround sound," for the sake of clarity. Even then there are many different approaches. -- ______________________________________________________________ Richard Zvonar, PhD (818) 788-2202 http://www.zvonar.com http://RZCybernetics.com http://www.cybmotion.com/aliaszone http://www.live365.com/cgi-bin/directory.cgi?autostart=rz