Hi Jonathan, Thanks for pointing this out - yes, it a delay for each source at each speaker. This might have been what was confusing Ralph.
Maybe some context would help. Control is from a mobile device, which sends 3D coords to a Mac/PC server. A DAW or multi-channel Wav file plays 32 channels of audio over Ethernet AVB. These 32 channels get sent to each speaker. In each speaker is a 32 x 1 matrix with attenuation and delay at each cross point. I figure out the mix levels, using DBAP, and the delay levels using the virtual source to speaker distances. I haven’t needed fast moving sounds, but would be great to have frequency manipulation at the cross points, and experiment with a Doppler effect. Hope that clarifies :) > On 26 Aug 2019, at 18:36, Jonathan Kawchuk <jonathan.kawc...@gmail.com> wrote: > > Hi Richard, > > Very interesting. So there would be a delay consideration per source, not per > speaker. Is this already written into the DBAP algorithm or any pan law at > that, or do you manually implement. If so, how? > > By the way, in much the same line of thinking, if this gunshot were moving, > would you implement a doppler effect or would that be impossible to calculate > on a per source basis since it is so listener position dependant? > On Aug 23, 2019, 2:27 PM -0600, Richard Foss <r.f...@ru.ac.za>, wrote: >> Sorry, slow reply Ralph. The way I see it - focus on the virtual source, >> not the listener position. Wherever the virtual source is positioned in >> an installation, make the speakers respond as if there was a real source >> at the virtual source position. If there was a gunshot at the virtual >> source position, the gunshot should not play immediately from a speaker >> some distance away from the virtual source position. >> >> A person close to the further speaker (from the virtual source) should >> hear the louder gunshot from the close speaker (to the virtual source) >> and the softer gunshot from the further speaker at the same time. If the >> softer gunshot arrived from the further speaker first, the proximity >> effect might kick in. >> >> I am talking about a DBAP context, where all speakers play at varying >> levels, not for example VBAP. As I mentioned, this approach seems to >> work very well when implemented. >> >> On 2019/08/22 10:18 PM, Ralph Jones wrote: >>> Richard Foss, I still don’t get it, sorry. Perhaps I’m being obtuse. But to >>> clarify, you said: >>> >>>>>> for a particular real source >>>>>> channel, delay its play out from a speaker FAR from the virtual source >>>>>> LONGER than from a speaker CLOSE to the virtual source >>> >>> (capitalization mine). Why do you want to delay the signal to the FARTHER >>> speaker? How does that help address proximity effect? It seems to me that >>> it would only accentuate it. >>> >>> Ralph Jones >>> _______________________________________________ >>> Sursound mailing list >>> Sursound@music.vt.edu >>> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, >>> edit account or options, view archives and so on. >> >> -- >> Professor Richard Foss >> Computer Science Department >> Rhodes University >> Grahamstown 6140 >> South Africa >> >> Tel: +27 46 6038294 >> Cell: +27 83 288 9354 >> email: r.f...@ru.ac.za >> >> _______________________________________________ >> Sursound mailing list >> Sursound@music.vt.edu >> https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit >> account or options, view archives and so on. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20190826/09a065d8/attachment.html> > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit > account or options, view archives and so on. _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
