Thank you very much Fons!
On Fri, Jul 19, 2013 at 10:37 AM, Fons Adriaensen <f...@linuxaudio.org>wrote: > On Fri, Jul 19, 2013 at 09:56:40AM -0400, Hector Centeno wrote: > > > I'm trying to implement virtual microphones derived from first order > > ambisonic soundfields using Csound. I was wondering if anyone had any > > resources to share with equations that would allow me to achieve this, > > specifying azimuth, elevation and directivity of the mic. I've been > > analyzing Fons' code for Tetraproc (the Virtmic class) but I'm having > > difficulties understanding some parts of it (but I'll keep trying). I > found > > the paper "Has Ambisonics Come of Age?" by Bruce Wiggins wich contains > > equations for doing this but it seems that it only takes azimuth angle in > > consideration. > > Given > > A = mic direction azimuth > E = mic direction elevation > D = directivity, [0...1], 0 = omni, 0.5 = cardioid, 1 = fig-8 > > and assuming your B-format is FuMA, compute > > cw = sqrt(2) * (1 - D) > cx = cos(A) * cos(E) * D > cy = sin(A) * cos(E) * D > cz = sin(E) * D > > and then the output signal for the mic is > > cw * W + cx * X + cy * Y + cz * Z > > 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 > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20130719/a5cc7e60/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
