On 2022-12-05, Fons Adriaensen wrote:
On Mon, Dec 05, 2022 at 07:07:08AM +0200, Sampo Syreeni wrote:
On 2022-12-04, Thorsten Michels wrote:
Does anyone ever heard of a system described as "3 point XY"?
Sounds like hogwash and snakeoil.
It certainly is not.
If the three mics are coincident (in the horizontal plane),
you can combine their signals to obtain
- An omni response
- A front/back fig-8
- A left/right fig-8
Fuck me. XY isn't well defined. Even I believed, when writing up the
OggPCM specification (drart still) that it's all cardioids 45 degrees
apart from center front.
Reducing that to the ambisonic framework, well, obviously you can *then*
recover WXY as soon as you have a linearly independent combination of
any two such pairs, or any three cardioids (which should not be called
XY then, because they are not paired).
What I was refererring to above was the older crossed pair. Perchance
from the Blumlein era. "Crossed eights". So, two dipoles, not cardioids.
Per standard theory, no amount of those in an coincident mic can ever
recover W, or anything above first order.
Maybe the XY terminology led me astray? Because whether you take it in
its established sense of, yes, cardioids, or the older one of crossed
dipoles, even three such linearly independent pairs (6 channels) leads
to an overcomplete problem wrt POA, and no real help towards HOA.
--
Sampo Syreeni, aka decoy - de...@iki.fi, http://decoy.iki.fi/front
+358-40-3751464, 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 - unsubscribe here, edit
account or options, view archives and so on.
