I always tell my students to consider carefully whether they actually want to use phantom imagery - sometimes a real source is better - it is, after all, very, very high order. But there are other factors - 1) the speakers are (usually) round the edge of the listening area - so all imagery tends to be at or some little way beyond, the edge. - there's a big 'hole' where you can't have images. 2) a single speaker doesn't handle movement well, if that's what you happen to want 3) none of the systems really produce more than 'flat' 2d images - you can have some control over apparent source width (though not with a single speaker), but that isn't actually equivalent to object size 4) a consequence of object size is 'facingness' - objects of any appreciable size actually must have the property of own-body occlusion. so you can't easily 'revolve' an object - we rather crudely tackled this in 1996 by using an inside-out ambisonic ring - panning could then control facingness (if you encode it, obviously)
As regards the hybrid system - our undergrads make explorable sound fields every year, combining 1st, 2nd ambisonics, panpot, VBAP, individual speakers, into one-off custom experimental rigs designed to depict unusual examples of spatial sound - bowling alley, race track, plane landing through the hall, waterfall, rain forest etc. The key point to all these is that the listener can explore, so phantom imagery doesn't work in quite the same way, and careful control of the ambient, indirect sound field is involved and that is different from the control of images. Of course, these aren't going to be commercial technologies, that's not the point of them - it's just nice to explore what can be done with artificial spatial sound. Dr Peter Lennox School of Technology, Faculty of Arts, Design and Technology University of Derby, UK e: p.len...@derby.ac.uk t: 01332 593155 ________________________________________ From: sursound-boun...@music.vt.edu [sursound-boun...@music.vt.edu] On Behalf Of Pierre Alexandre Tremblay [tremb...@gmail.com] Sent: 13 December 2012 09:07 To: Surround Sound discussion group Subject: Re: [Sursound] Proximity illusions - WFS vs HOA Dear all Let me be a little teasy and controversial here: > Focussing, no matter > how it's done, does not create a source. With that many speakers in a hall, you do happen to have a lot of real sources you can use... It could be amazing to think of a real hybrid system where point-source loudspeakers are used when a real point is needed, which is where all fantom image systems fail, some of them more gracefully indeed... My 2 cents. p _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound _____________________________________________________________________ The University of Derby has a published policy regarding email and reserves the right to monitor email traffic. If you believe this email was sent to you in error, please notify the sender and delete this email. Please direct any concerns to info...@derby.ac.uk. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
