Re: [Sursound] Fwd: Non Mixer Spatializer Demo
On 9 July 2013 01:03, Stefan Schreiber st...@mail.telepac.pt wrote: J. Liles wrote: Still, during that demo, most of the time the crow was actually below the horizon due to the fact that I automated its flight path rather carelessly by clicking the mouse at random points on a Control Sequence in Non Timeline (and the automation input is not bound by the top-only constraint that the interface is). Interestingly, a bird is a very bad subject for testing height and depth, especially if the perception is that it is flying. For most people, flying birds in real life are always above and it is almost impossible to shake that perceptual conviction off without other non-audio cues. A recording made by my ex colleague, Tony Myatt, of nesting seabirds, mad by sticking the Soundfield out on a pole from the top of Bempton cliffs (a bird sanctuary on the cliffs about 60 km from York) could _not_ be made to sound anything but up even though most of the birds were down around the nesting sites. Two commentaries: - the representation of negative elevation is easily possible via headphones/binaural techniques. - Direct sound from down might be rare or not (but think about some walk in the woods wearing a prototype of Oculus Rift and a head-mounted camera... :-D ), but reverberation from down is just normal. (Floor/ground reflections.) It is very dependent on type of music. For music genres that are mostly presented on stage or similar, there is probably no need for down (or possibly even up!) as a panning location. But, there's a whole world of other things out there from games to theatre and museums and right through to electroacoustic composers who would at one time or another find it useful or even artistically necessary. On of the limitations we most regretted having to accept in The Morning Line sculpture was that we could not move sounds much lower than -30 degrees from the horizontal. Nevertheless, we provided the composers with the ability to pan sounds both above and below - and it was used.. Dave If you care to share your use-case for negative elevations--I'm ready and willing to be convinced of their utility. I was just planning to ignore the issue until such time as I reimplement the interface using OpenGL--where the ability to move the camera and display more visual cues to its orientation would make manipulating points over the entire sphere more usable. See above! Best, Stefan Schreiber P.S.: You need the Oculus camera add-on (TM) to avoid running against the trees, at least during a VR assisted walk in the woods. Even better if you stayed at home...___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound -- -- As of 1st October 2012, I have retired from the University. These are my own views and may or may not be shared by the University Dave Malham Honorary Fellow, Department of Music The University of York York YO10 5DD UK 'Ambisonics - Component Imaging for Audio' ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Fwd: Non Mixer Spatializer Demo
It is very dependent on type of music. For music genres that are mostly presented on stage or similar, there is probably no need for down (or possibly even up!) as a panning location. You probably speak for the majority (about 'up') by I like listening to a 'tiered' orchestra in FOA/periphony ... and accept that is probably a personal idiosyncrasy. Michael ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Suggestions spherical loudspeaker installation observatory
You can check evenness oft he sampling of the sphere by checking the condition number of the spherical harmonics matrix. So create the SH matrix with some educated guess layout, define the corresponding SH order and see what happened to cond(Y). From there you can start designing. If there are areas where no speakers are possible, just place some anyway. E.g. for a hemispherical array, mirror down the layout to the lower hemisphere. How to design a decoder than is another problem. But Zotter's AllRound decoder [1] seems to be promising. Best Fabio [1] Franz Zotter, Matthias Frank, All-Round Ambisonic Panning and Decoding, Journal of the Audio Engineering Society, October, 2012 -Ursprüngliche Nachricht- Von: Sursound [mailto:sursound-boun...@music.vt.edu] Im Auftrag von Matthias Kronlachner Gesendet: Dienstag, 09. Juli 2013 15:29 An: Surround Sound discussion group Betreff: [Sursound] Suggestions spherical loudspeaker installation observatory Dear All, I am currently working on a 24-loudspeaker installation in an old observatory of Vilnius University. Maybe someone has suggestions on how to distribute those 24 loudspeakers. To get an image of the place, have a look at the photos [1] The radius of the dome is 2.3m. The dome is sitting on an octagonal base with circumradius 3.8m and 2m height. The installation is intended to be used for experimentation and small concerts of electroacoustic music, preferably with Ambisonics. There is a very nice high chair which allows one person to sit more or less in the center of the imaginary sphere. Therefore this seat allows loudspeaker placement in the lower hemisphere. But the installation should also work for people sitting or standing on the floor. I was thinking about having one north pole speaker, one ring in the dome itself, one ring below the dome (bellow equator) and one ring on the floor. Does somebody have any suggestions for such an installation? Also concerning Ambisonics-decoder friendly distribution? (i know, this is a topic that can fill libraries...) Any comments and tips are greatly appreciated! Thanks, Matthias [1] http://www.matthiaskronlachner.com/observatory/dome.JPG http://www.matthiaskronlachner.com/observatory/sweet-spot.JPG http://www.matthiaskronlachner.com/observatory/panorama.JPG http://www.matthiaskronlachner.com/observatory/from-balcony.JPG -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20130709/4d6 fe0a2/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Suggestions spherical loudspeaker installation observatory
Michael Chapman wrote: Martin Leese wrote: In general, for Ambisonics, you should distribute the speakers as evenly as possible. Aim for the faces of a platonic solid; visit: http://en.wikipedia.org/wiki/Platonic_solid Problem is ... despite many claims to be on the verge of discovering new ones;-) ...that Plato did not have many solids . . . I _thought_ the consenus on this list (no howls of derision, please) was edging towards three rings ... though without looking back, whether that was 6-8-6 or something else ...? Just a two pennies' worth, I did not make myself sufficiently clear. Aiming for a Platonic solid is just a goal, not a destination. I was trying to suggest that achieving an even distribution is important, and was not trying to dictate strict adherence to a fixed rule. Note that with only three rings, you are limited to second-order height. This may or may not be a problem. 24 speakers is almost 5 squared, so fourth-order full-sphere could be attempted. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/ ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Suggestions spherical loudspeaker installation observatory
On Wed, Jul 10, 2013 at 01:58:04PM -0600, Martin Leese wrote: Note that with only three rings, you are limited to second-order height. This may or may not be a problem. 24 speakers is almost 5 squared, so fourth-order full-sphere could be attempted. 1 + 6 + 8 + 6 + 1 works very well for full 3rd order (with the rings of 6 at elevation +/-45). That is assuming you have 3rd order material to play. For lower order you should definitely use less speakers. 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
