Re: [Sursound] Level difference between A-format and B-format (Ambix and FuMa)

[Rudy Chalupa]

The Mixpre recorders had a similar issue with MS encoding when they first came 
out - it took a few revisions before that got sorted out. So it wouldn't 
surprise me that something similar is happening here.
Cordially,
Rudy ChalupaPleiades Audio + Electronics


-Original Message-
From: Arthur Sauer 
To: sursound@music.vt.edu
Sent: Tue, Jun 22, 2021 5:17 pm
Subject: [Sursound] Level difference between A-format and B-format (Ambix and 
FuMa)

I'm having an issue with a Sound Devices recorder (MixPre 10 II), where there 
is a level difference between the A-format and the simultaneously recorded 
B-format (Ambix and FuMa).
The level difference is 16 dB.
This is a first order ambisonic recording (with a Core Sound Tetramic).

Someone from Sound Devices assumed that this level difference may be due to the 
conversion.

Now I know normalizations are used for the conversion from A to B-format (SN3D, 
maxN), but I can't work out the mathematics behind it.
Anyway, looking at it does in no way seem to explain a level difference of 16 
dB.

Now I was wondering: is there any level difference to be expected between 
A-format and B-format Ambix or FuMa?
How much?

I do not like to make wrong statements to someone who should be helping me 
fixing a bug.
So, could someone enlighten me on this subject?

Best regards,

Arthur Sauer


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Re: [Sursound] Level difference between A-format and B-format (Ambix and FuMa)

[John Leonard]

Arthur,

There’s no point in doing any conversion of the TetraMic signals in the MixPre. 
In order to get a correct signal, you must use the provided set of filters 
specific to your microphone, which you can only do using the appropriate VST 
plug-in in a DAW or in something like Plogue Bidule.. The MixPre’s internal 
conversion is only for the Sennheiser Ambeo microphone and will provide useless 
results for the TetraMic.

Regards,

John

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[Sursound] Level difference between A-format and B-format (Ambix and FuMa)

[Arthur Sauer]

I'm having an issue with a Sound Devices recorder (MixPre 10 II), where there 
is a level difference between the A-format and the simultaneously recorded 
B-format (Ambix and FuMa).
The level difference is 16 dB.
This is a first order ambisonic recording (with a Core Sound Tetramic).

Someone from Sound Devices assumed that this level difference may be due to the 
conversion.

Now I know normalizations are used for the conversion from A to B-format (SN3D, 
maxN), but I can't work out the mathematics behind it.
Anyway, looking at it does in no way seem to explain a level difference of 16 
dB.

Now I was wondering: is there any level difference to be expected between 
A-format and B-format Ambix or FuMa?
How much?

I do not like to make wrong statements to someone who should be helping me 
fixing a bug.
So, could someone enlighten me on this subject?

Best regards,

Arthur Sauer


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[Sursound] 3D Tune-In Toolkit - new releases of the VST plugins

[Picinali, Lorenzo]

Dear colleagues,

apologies for cross-posting.

We have now released the new versions of the 3D Tune-In Toolkit VST plugins.

The 3DTI Toolkit is a standard C++ library for headphone-based audio 
spatialisation, with a hearing loss and hearing aid simulator. It can be 
accessed open-source through our GitHub account 
(https://github.com/3DTune-In/3dti_AudioToolkit/).

We have now released five separate VST plugins:

  *   Full binaural spatialisation (for spatialising one sound source including 
anechoic and reverberation renderings within the same interface)
  *   Separate anechoic spatialisation and binaural reverberation (two separate 
plugins, which allow to spatialise multiple sources using one single 
multichannel bus reverberator, therefore making the processing more efficient - 
please see the MaxMSP and Reaper examples on how to configure your host/DAW)
  *   Hearing loss simulator (implementing also the Baer&Moore frequency 
smearing algorithm)
  *   Hearing aid simulator

You can download these for both MacOS and Windows, together with other releases 
(including the 3DTI Toolkit standalone application), at the following link:

https://github.com/3DTune-In/3dti_AudioToolkit/releases

At the link above you'll also be able to find two videos demonstrating the 
binaural spatialisation and hearing loss/aid emulation functionalities of the 
3DTI Toolkit.

Here you'll be able to find the open-source code:

https://github.com/3DTune-In/3dti_AudioToolkit_VST_Plugins

We are working on the release of the Unity wrapper/asset - this should be ready 
by the end of the Summer, but if you are interested to try it out please email 
me sending me a very brief description of the work you are planning to do, and 
I will send you the compiled version.

Best

Lorenzo & the 3D Tune-In Toolkit developers team at Imperial College London and 
the University of Malaga.





--
Dr Lorenzo Picinali
Reader in Audio Experience Design
Dyson School of Design Engineering
Imperial College London
Dyson Building
Imperial College Road
South Kensington, SW7 2DB, London
T: 0044 (0)20 7594 8158
E: l.picin...@imperial.ac.uk

http://www.imperial.ac.uk/people/l.picinali

www.imperial.ac.uk/design-engineering-school<http://www.imperial.ac.uk/design-engineering-school>
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