On Jul 6, 2009, at 13:10, Rob Danielson wrote:
> Maybe
> I'm not following your thinking, but the Ambisonic rigs are very
> exceptional in design, not really made for use in different array
> configurations.
Rob,
Right, what I'm thinking (and this isn't really practical, unless
you're much more serious (and well funded) than me), is to exploit
the fact that you can mix the X,Y and Z channels produced by an
Ambisonic mic array to simulate a single mic with any arbitrary
polar pattern in any orientation. There will be some coloration
caused by sounds that come in off axis to the physical capsules,
but for the purposes of testing and comparison, that may be an
acceptable price to pay.
So a single Ambisonic mic (4 channels) can emulate any coincident
technique: XY, MS, Blumlein, whatever. And with two such mics
mounted some distance apart, we can mix for any Williams
"stereophonic zoom" angle for the spacing at which the physical
mics were mounted.
My (idle) idea was just that an interesting test rig would be a
set of two to four ambisonic mics spaced at irregular distances,
such that we can mix to various Williams zoom configurations
plus any coincident configuration we want, plus another pair
on either side of a Jecklin-type barrier (each mixed to omni) to
provide a controlled comparison between the others and Jecklin.
But this would involves quite a few mics, at 4 channels each...
Best
-matt
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