Hi David, you are not alone in your insigthes. Some single discrete reflections are the most important fact for estimation of source distance. There exist research from Helmut Wittek, who was proven, play the reverberation from four different directions is absolutely sufficient. We cannot use the direction of the wave fronts in the reverberation tail for determine the position of the source. Also in the recording room, the reverberation arrives from all possible directions.
Another case are the first reflections. Her delay time and direction are the most important fact for approve the source position, what inclusdes its distance and the size impression of the recording room. Such single reflections causing deep comb filter effects and change the perception considerably. On the other hand, for reverberation is valid, what floyd Toole says sometimes: As more reflections esxist as less disturbing there are. ( as far as I remember well his words ). All we need for correct distance reproduction is restore some ingle reflections from her correct starting points and the correct relation between direct wave and reverberation. Regards Helmut www.holophony.net 2011/4/19 dw <surso...@dwareing.plus.com> > > Hi List, > Just popped in.. It's been a while! > > IMO it is a combination of time-of-flight and the inverse square law, where > t=0 is a virtual point in time determined by the brain as an intercept by > "plotting" a function of the intensity of (primarily) transverse reflections > against time. Fortunately it is not necessary to work out how the brain > might do this. One needs to concentrate maximising the availability, and > accuracy of the information that would be needed to make such a calculation > possible, without making too much muddy reverb. in the process. Mono reverb > does not seem to play much, or possibly any, part in this. It seems to be > extracted in some way from larger ITDs and ILDs ie. transverse discrete > reflections. It took me several years to work all this out, and nobody seems > to have independently come to the same conclusion in the last decade or > so.. so it must be wrong. At least it is free and in the public domain now! > My Heli.wav on "Audio and Three Dimensional Sound Links* (long gone) was a > product of precisely this method of distance synthesis. > > Regards, > David Wareing. > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20110420/273802eb/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
