Dear member of the list, I wanted to ask for some opinions\advice about multichannel reverb.
Some background first: I'm emailing on behalf of Earfilms <http://www.earfilms.com/>: We are currently in the process of producing our first show for a 19 speaker sound-system (arranged on a dome + 4 subs on the floor). We have a custom spatialisation system utilising 3rd order ambisonics, ambipanning and vbap. We would like to incorporate a 'proper' multichannel reverb, which would take into consideration the position of the sound source within the virtual space and render the result into 19 discrete channels. We are looking either to buy\use ready made software or to develop our own. We use MaxMSP for spatialisation but we could easily incorporate anything available in Csound, Supercolider or other such software as long as it can be controlled via OSC. The options we are aware of are the following: 1. using algorithmic reverb like the one in IRCAM''s SPAT (max msp version since the plugin is limited to 8 channel output) 2. using a custom made convolution reverb: 1st order ambisonics IR (4 channels) convolved with 1st order components of panned sound sources - The simple case: one 4channel 1st-order IR - more complex: multiple 1st-order IR's recorded with the source of the impulse placed in different positions within the space First, I would like to ask for opinions about the quality of the SPAT reverb (max msp version). Does it sond convincing? How much better is it then just using a stereo reverb somehow distributed between all available speakers? We'd be happy to pay for IRCAM forum subscription if we knew what we are paying for. Unfortunately we haven't been able to put our hands on a copy of the externals so we can try it out ourselves. Secondly, if we go the second route, we are aware we'd have to get the IR's from somwhere. Are there any free\comercial 1st order IR's out there? We will not be able to record our own, so we were looking into synthesising some using ray-tracing software. I found this commercial one: http://www.quikquak.com/Prod_RaySpace.html and a matlab code in the following paper: http://home.tiscali.nl/ehabets/rir_generator/rir_generator.pdf. Does any one know any alternatives? Another issue when implementing a reverb with the multiple IR's (multi source), has it been established in any way what is the best practice when crossfading between the IR's when the source moves? Should the closest 2 IR's be used and just crossfaded based on distance? Any further though about the subject, as well as links to literature\research would be highly appreciated. Thanks you for your time! -- Adrian Gierakowski -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20130214/ec6009b0/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
