Citando Eric Benjamin <eb...@pacbell.net>:
I did this rotation and calibration operation. Unfortunately the
results were not great. When the array is rotated it has to overlay
the previous position perfectly. There is also a tendency for the
mic stand to wobble when it rotates. These results are shown in my
AES paper on the second order microphone.
Eric Benjamin
As I suspected...
SF microphones are precision instruments! If even stand wobbling is an
issue I would say:
Forget about combining 4 separate IR measurements, and either
- use the available mathematical methods for FOA RIRs to increase the
resolution/order.
- use an Octomic (or alternatives) anyway.
Thanks,
Stefan
From: Fernando Lopez-Lezcano
Sent: Monday, April 23, 2018 1:11 PM
To: Surround Sound discussion group
Subject: Re: [Sursound] RIR measuring,how to capture a higher order
Ambisonic room responce?
On 04/23/2018 12:42 PM, Stefan Schreiber wrote:
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 :-).
You would need to "calibrate" the created 8 capsule array. That is,
record impulse responses all around it in a big space or anechoic room
(enough to accurately sample the spherical harmonics you want), and then
derive an A to B converter from that. I have some preliminary code in my
SpHEAR project that tries to do that, but it is not a "push a button and
you are done" thing at all...
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