WFS does give an opportunity (in ideal circumstances, I think) to have imagery inside the array, holographic style. Not everywhere in the array, and although it is remarkably robust (the image stays in one place, a point hovering in mid-air) as the perceiver moves around, it does 'break' if the perceiver tries to pass between the image and the array nearest to it.
I don't know of HOA is capable of that, I've never heard sufficiently high order. Height: I think some WFS setups have the traditional horizontal array, 360 degree, plus a line (or even two, cross-fashion) on the ceiling. It depends on what you're putting up there, and how precise you need it to be - control of imagery isn't the same as control of spaciousness. I listened to WFS in the lab at Delft in about 1998 and was well impressed. However, the lack of "up" was keenly felt, and, without it, the reverbs in the horizontal plane sounded less 'real' than I would have liked. I suggested using ambisonic, 1st or 2nd order, for all the ambient material (the manufactured ambience in WFS was computationally expensive at that time) which could free up processing and have a much more naturalistic spacious ambience. I think my suggestion, at that time, might have seemed like a retrograde step, mathematically inelegant. But it would work very well, I reckon, and, if channel count limitations are still an issue, it could be handy. At the extreme, Aldi end of things, you could use 1st order with height, carried on 4 channels then decoded with an analogue decoder. So you'd still have 250 channels for your WFS. Or if you're needing to work in multiples of 8 for your WFS (was that the reason for 256?) you could go down to 240, then use the remaining <14 channels for soft decoded 2nd order height(+lowth). You're stepping down spatial resolution in the WFS (moving the spatial aliasing down a bit?) but trading it for better ambient-height and even some decent imagery-height So what are you going to use this rig for? Cheers ppl 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 -----Original Message----- From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On Behalf Of Augustine Leudar Sent: 08 December 2012 23:04 To: Surround Sound discussion group Subject: Re: [Sursound] remarks on "with-height" wfs more effective proximity Another question is why you would use WFS for the horizontal part at all. > Does it offer anything you need and that HOA can't do ? > > Ciao, > > -- > FA > > A world of exhaustive, reliable metadata would be an utopia. > It's also a pipe-dream, founded on self-delusion, nerd hubris and > hysterically inflated market opportunities. (Cory Doctorow) > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -- 07580951119 augustine.leudar.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20121208/25407135/attachment.html> _______________________________________________ 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
