At 4:06 PM -0400 7/6/09, Matt Blaze wrote:
>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
>
Matt-
Ah, that is quite another direction. In your previous tests, with
the exception of the M-S array, there are precise distances,
absorption surfaces, boundary effects, angle positioning and other
physical variables involved. It would be great to only have to
set-up one mic and protect it and then have so many ways to play with
imaging in post. I've experimented with quite a few arrays and I'm
not quite ready to stop employing the physical variables myself. If
I ever get access to a good, low noise, ambi rig, I'd love to run
some tests comparing the surround recordings with spaced arrays in a
large, quiet space. Big hole in my experience there. Rob D.
--
|