I have been using a stepper motor (of the kind used in 3d printer ) driven by a
low cost Arduino and motor control board. I 3d print a snug fitting fixture for
the microphone with the motor shaft aligned to the array centre. It is low
cost so I design a fitting for each mic I test, including
On 04/23/2018 03:19 PM, Fons Adriaensen wrote:
On Mon, Apr 23, 2018 at 01:10:56PM -0700, Fernando Lopez-Lezcano wrote:
In my case to get good calibration data I need to rotate the microphone with
no wobble and at different orientations (or if it is not _exactly_ perfect,
try to get away with
On Mon, Apr 23, 2018 at 01:10:56PM -0700, Fernando Lopez-Lezcano wrote:
> 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
es and so on.
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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
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gt;
>
>
> --
>
> 07889727365
>
> 02036861372
>
> 3 Swimmers Lane
> Haggerston
> London
> E2 8FR
>
>
> www.facebook.com/reynoldsmicrophones
>
> www.sohovr.co.uk
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On Mon, Apr 23, 2018 at 12:24:47PM +0100, jack reynolds wrote:
> The new coresound octomic is based on two tetramics, with one rotated 45
> degrees from the other
This is simply not true.
Ciao,
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gt;>> ambisonic) of 3 different spaces with our kit, and it was fun and
> >>>> productive to train the ear on difference of multichannel mic
> techniques
> >>>> (Hyunkook Lee has a cool setup and papers on them, and I was mostly
> >>>> interested in D
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By the way one could actually use only one microphone, measure the RIR, rotate
it to another point, repeat the measurement, and make a virtual array of
hundreds or thousands of points for high-order RIR recording. This has actually
been done and the work published by Boaz Rafaely and his
nkook Lee has a cool setup and papers on them, and I was mostly
>>>> interested in DPA LCR omni vs coincident vs MS)
>>>>
>>>> We did many stage positions too. I can investigate if I can share the
>>>> files if that interests anyone.
>>>>
>>
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Hi,
As far as I know you cannot simply obtain 2nd order channels from two sets of
1st order channels. A look at a visual representation of the spherical
harmonics indicates that this is far from trivial.
https://brilliant.org/wiki/spherical-harmonics/
The SDM suggested by Archiontis, or
lm
Stockholm
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gt;> > >
>> > > I want to measure the RIR of a medium size good listening room at
>> least
>> > up
>> > > to second order Ambisonic RIR.
>> > >
>> > > The IR result is to incorporate the responce and reflections of the
>> >
> speakers and their positions.
> > >
> > > I have a tetramic.
> > >
> > > Can several measurements and rotation of the tetra mic between them be
> > > combined to create the measurements that comes closer to a second order
> > mic?
> > >
order
> mic?
> >
> > I know the basics of using Audacity, and a audio sweep and creating a IR
> > from this.
> >
> >
> >
> > Bo-Erik Sandholm
> > Stockholm
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>
ating a IR
> from this.
>
>
>
> Bo-Erik Sandholm
> Stockholm
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;
> Bo-Erik Sandholm
> Stockholm
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