That occurred to me too. The Oktava array is really huge (mine is an old
one; the newer ones may be smaller); it places the capsules on a sphere
of radius 48 mm - nearly 4" diameter! But the problem, the swapping of
left and right in the front soundstage, exists only for one decoder (of
those that I have tried) and only for one virtual mic pattern - VVmic
decoding B-format to Blumlein stereo pair; it doesn't occur if I use
Harpex B Player to decode the B-format to the same Blumlein stereo pair.
That's what is puzzling. If they were swapped in more cases I could
perhaps understand it better. I was wondering if VVMic and Harpex treat
the 'back' lobes of the crossed figure-8s differently.
When I have some more time, I will try to record something using both
the Oktava array and a Brahma Ambisonic mic and to see if there is the
same difference. The Brahma array is much smaller than the Oktava array.
Gerard Lardner
On 14/06/2015 17:34, Paul Hodges wrote:
--On 13 June 2015 20:15 +0100 Gerard Lardner <glard...@iol.ie> wrote:
I recorded a concert using my Oktava MK-012 4D ambisonic microphone
and encoded it to B-format using Brahmavolver. Yesterday, while
playing back the recording with the conductor we noticed that under
certain circumstances left and right appeared to be swapped.
My first thought is that the microphone used has its capsules more
widely spaced than other tetrahedral mics, which could be leading to
some directivity confusion at lower frequencies than usual, which in
turn this material might be sensitive to. Certainly I've never noticed
such an effect with VVmic, whether using a TetraMic or my previous
native B-format arrangement.
Paul
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