On 2013-03-02, Eero Aro wrote:
I am writing an article about an un-orthodox stereo recording setup, "common acoustical point". Two cardioids with a reasonably long spacing, pointing towards a single source, so that the on axis directions cross.
Sounds like something that would be handled under O-format. We've also gone through something similar with Filippo and perhaps Angelo when I tried to hash out how the NFC-HOA and WFS stuff go together, and e.g. how you get down from the combined monopole/fig-8 rig suggested by the naïve Kirchoff-Helmholtz integral over a sphere. There one thing we bumped into was the separation made in the NFC-HOA papers between the inward and outward propagating fields, which can't be separated if you ditch one of the two transducer types. I seem to remember mentioning an O-format based "from inside out" type array at least in that context, and also several years before in connection with Angelo's room simulation work.
What you're doing sounds like you're essentially dualizing the usual ambisonic setup the same way. That'd lead to a closely spaced emitter. As such it's not impossible Ralph might have something to say about that, too, given Ambiopoles.
The setup reminded me of a discussion of a similar type surround recording setup. Four or several mics on a circle around the source would capture a LOT more time and phase differences between the channels than a stereo setup.
Certainly Ralph and perhaps Robin's turf. -- Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front +358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2 _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
