I can do the 4 measurements with 45 degrees rotation of my tetramic, that
is not so difficult, the next step to create a second order ambisonic RIR
that is where I will fail :-).
I believe you might need a quite high precision to be successful even
at the first step...
(A SF mike has narrowly spaced capsules, and needs calibration....The
mechanical precision you need to measure 2nd order with a FOA mike is
IMHO high.)
So the mathematical methods (based on FOA but improving the RIR
resolution, as suggested by Archontis) should be a better way to go
on... Especially since you could receive even higher
resolutions/orders, and in practice.
So the presented ideas to capture 2nd order RIRs via a 1st order mike
are brilliant, but are they practical?
And even if somebody could succeed in a very careful process: this
does not look to be a robust measurement method. ..
We always talk about the 1st reflections, in this case. Not reverb,
which is kind of statistical.
Of course you can try, but how much precision is rally needed? (Should
be clarified before...)
Stefan
——————————
Citando Bo-Erik Sandholm <bosses...@gmail.com>:
I can do the 4 measurements with 45 degrees rotation of my tetramic, that
is not so difficult, the next step to create a second order ambisonic RIR
that is where I will fail :-).
I will need a more detailed step by step instruction to reach my goal :-).
Bo-Erik
Stockholm
On Mon, 23 Apr 2018 21:02 jack reynolds, <jackreynolds...@gmail.com> wrote:
you are right fons.
it is an octohedron with the top four rotated 45 degrees.
but i would have thought two tetramic IRs at 90 rotated 90 degress from
each other would give you quite good coverage.
rotated 45, 90 and 135 would be even better! Plus another couple for up and
down?
J
On 23 April 2018 at 19:50, Fons Adriaensen <f...@linuxaudio.org> wrote:
On Mon, Apr 23, 2018 at 07:18:33PM +0100, jack reynolds wrote:
> indeed. apologies, it is 90 degrees.
Again no. To cover all the directions of the Octomic capsules
with a Tetramic you need 4 orientations of the Tetramic (and
you get another 8 directions as a bonus).
Ciao,
--
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