On 2022-12-05, Fons Adriaensen 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
Okay, crap. XY stereo apparently is not well-defined. Your version is
about XY as frontally oriented cardioid responses. There you can indeed
recover full pantophony from any three such mics, which are linearly
independent. And in fact I've already gone with this definition when I
wrote up the OggPCM channel map definition. I even defined XY like you
do, there.
However, the basic version of XY I was originally taught utilizes two
pure velocity mics in quadrature. I believe that comes from Blumlein's
early work. If you go by that definition, no combination of such
coincident "XY"'s can ever recover W.
Whereupon my outburst. Might we agree to call it a glitch in
nomenclature? Shoulda known better, but reverted to an earlier time?
--
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
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