Re: [Sursound] Which microphone system to choose?

[Fernando Lopez-Lezcano]

On 8/9/22 1:57 AM, Fons Adriaensen wrote:

On Mon, Aug 08, 2022 at 09:54:25PM +, Thorsten Michels wrote:


My first idea was to use my native Ambix-B-format microphone setup. This
would give me the greatest flexibility, right?


Not really. Higher order AMB will give you much better results.
There are not so many options. The following provides some
info on how they compare:




Hi Fons, this is _great_!
< measurements such as this was a "pandemic goal" I never realized, oh 
well... >


Any graphs of the performance in elevation != 0? Ie: plots, of, say, "T" 
at different frequencies? I'm really curious...


Any information on how the measurements were taken?
Best,
-- Fernando



But a few weeks ago I did a recording on a historical marketplace with it
and additionally with my "real-head-binaural" (Roland CS-10EM) in-ears
microphones.

The blackbirds in the tree above I can very clearly and precisely localize
with the Rolands, but not with the AmbiX-B-format. What a disappointment!


That is to be expected. But:
- The real-head-binaural is optimised for *your* head and ears. It may
   not provide the same result for other listeners.
- It's also not possible to render this with head tracking, and
   conversion to non-binaural formats may be problematic.

To get really good results when converting to binaural you need higher
order AMB. First order can be optimsied but even then it is really a
very delicate compromise between conflicting requirements.


But what would you choose? And always be aware of this is a unique and real
"once-in-a-lifetime" chance


I'd go for the Eigenmike or Core Sound's Octomic. And of course if you have
some spare channels. add some classical stereo setups.
It would also depend on what is the intended use of these recordings.

Do quantum computers make any noise at all (except for the cryogenics etc.) ?

Ciao,



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Re: [Sursound] Which microphone system to choose?

[Fons Adriaensen]

On Tue, Aug 09, 2022 at 09:12:54AM -0400, Marc Lavallée wrote:

> Your document mentions that the results for the EM and the ZM-1 are based on
> a numerical simulation; can you (briefly) elaborate?

There is an analytical solution (involving spherical Bessel and Hankel
functions) for diffraction by a solid sphere, so it is possible to compute
the response of each of the capsules for a plane wave arriving from a given
direction. This provides the same info as an impulse response measurement,
just assuming a perfect sphere and capsules.

So any calibration procedure based on impulse response measurements (i.e.
finding a convolution matrix that transforms the set of capsule signals
into polar patterns corresponding to spherical harmonics) can be done as 
well using such 'simulated measurements'. 
 
> What is the criteria to define a "usable polar pattern" (to determine a
> highest frequency)?

That is a fuzzy definition of course. I'd say a signal is 'usable' if,
when combined with others in a beamformer or AMB decoder, it can produce
something close to the required result.

Ciao,

-- 
FA

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Re: [Sursound] Which microphone system to choose?

[Ralf R Radermacher]

Am 08.08.22 um 23:54 schrieb Thorsten Michels:


At the end of August I will be in the IBM Mainframe research lab and I
was granted the great honor and permission to do some recordings of the
following devices:


If you happen to have an iPhone and would like something really
portable, you might have a look at a Sennheiser Ambeo Headset. They've
stopped making them and they're on sale at various outlets, e.g. Amazon.
I've seen them as low as 39 euros. The original price was around 300 euros.

The quality is excellent and I've had some very nice results with them.

Ralf

--
Ralf R. Radermacher  -  Köln/Cologne, Germany
Blog  : http://the-real-fotoralf.blogspot.com
Audio : http://aporee.org/maps/projects/fotoralf
Web   : http://www.fotoralf.de
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Re: [Sursound] Which microphone system to choose?

[Fons Adriaensen]

On Mon, Aug 08, 2022 at 09:54:25PM +, Thorsten Michels wrote:

> My first idea was to use my native Ambix-B-format microphone setup. This
> would give me the greatest flexibility, right?

Not really. Higher order AMB will give you much better results.
There are not so many options. The following provides some 
info on how they compare:



> But a few weeks ago I did a recording on a historical marketplace with it
> and additionally with my "real-head-binaural" (Roland CS-10EM) in-ears
> microphones.
> 
> The blackbirds in the tree above I can very clearly and precisely localize
> with the Rolands, but not with the AmbiX-B-format. What a disappointment!

That is to be expected. But:
- The real-head-binaural is optimised for *your* head and ears. It may
  not provide the same result for other listeners.
- It's also not possible to render this with head tracking, and
  conversion to non-binaural formats may be problematic.

To get really good results when converting to binaural you need higher
order AMB. First order can be optimsied but even then it is really a
very delicate compromise between conflicting requirements.

> But what would you choose? And always be aware of this is a unique and real
> "once-in-a-lifetime" chance

I'd go for the Eigenmike or Core Sound's Octomic. And of course if you have
some spare channels. add some classical stereo setups.
It would also depend on what is the intended use of these recordings.

Do quantum computers make any noise at all (except for the cryogenics etc.) ?

Ciao,

-- 
FA

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Re: [Sursound] Which microphone system to choose?

[Bo-Erik Sandholm]

Try to borrow a Zylia ZM-1 or any other higher order ambisonic mic, this
gives you third order b-format.

Converting to other formats works better than first order.

When I feel comitted to be sure and get it right I record tetracycline foa
and spaced omnis on a 6 track tascam dr-680 recorder and a Zylia ZM-1 for
my laptop.


Bo-Erik




Den mån 8 aug. 2022 23:54Thorsten Michels  skrev:

> Hi all!
>
> At the end of August I will be in the IBM Mainframe research lab and I
> was granted the great honor and permission to do some recordings of the
> following devices:
>
> Mainframes: IBM Z 14, IBM Z 15 and the brandnew Z16. As this wouldn't be
> enough, I will get a few minutes to record the IBM Quantum computer. (no
> joke!)
> So this is a "one-shot-only-single-chance" and I would like to make as
> much as possible out of it.
>
> My first idea was to use my native Ambix-B-format microphone setup. This
> would give me the greatest flexibility, right?
> But a few weeks ago I did a recording on a historical marketplace with
> it and additionally with my "real-head-binaural" (Roland CS-10EM)
> in-ears microphones.
>
> The blackbirds in the tree above I can very clearly and precisely
> localize with the Rolands, but not with the AmbiX-B-format. What a
> disappointment!
> So, this is a "checked" for the realhead-binaural system.
>
> But what would you choose to record these machines?
> a) native AmbiX-B-format microphone system
> b) double M/S
> c) regular ORTF
> d) regular XY
> e) some combinations? (please choose)
>
> I just bought some contact microphones, just for fun. Let's see where
> this will get us. :-)
>
> But what would you choose? And always be aware of this is a unique and
> real "once-in-a-lifetime" chance
>
> Any oppinion, advice, dos or donts, hints ... please be frankly and
> open. I hearitly appreciate ANY of your support; as I am running in
> circles and can't get to a decision.
>
>
> Thank you very much in advance!
>
> Cheers
>
> Thorsten
>
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