Hello Hector,
If you're up for moving to SuperCollider for your work, check out the ATK:
http://www.ambisonictoolkit.net
We have all sorts of these things in-built. Along with lots of fancy tricks and
spatial filters.
Docs are found here:
http://doc.sccode.org/Browse.html#Libraries%3EAmbisonic%20Toolkit
My best,
~~
Joseph Anderson
Artist: http://joseph-anderson.org
Ambisonic Toolkit: http://ambisonictoolkit.net
On 19 Jul 2013, at 4:02 pm, Hector Centeno hcen...@gmail.com wrote:
Thank you very much Fons!
On Fri, Jul 19, 2013 at 10:37 AM, Fons Adriaensen f...@linuxaudio.orgwrote:
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)
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