Re: [Sursound] binaural to FOA?

Fri, 05 Mar 2021 07:07:47 -0800

I tried BACHH4Mac, using my Soundman "things" as measurement microphones with my old Zoom H2; Edgar Choueiri would not agree with my choice of "in-ear" microphones and audio interface, but I'm not much of an audiophile/scientific type of audio enthusiast. I could try to do the same with a diy dummy head, capture the IR and use it in my custom software, but maybe that would not work well for all users (and that could be against some part of the licensing agreement).
Maybe I can try Spat, but only if the transform from binaural to transaural is a linear operation. I need IRs because the installation will run from a Raspberry Pi, so that's why I like the idea of using the Super Stereo ATK kernel. 

And I agree, going FOA all the way would be better.

Marc

Le 21-03-05 à 09 h 49, Augustine Leudar a écrit :

You can try Spats Transaural thing. I honestly think you'd be better off
building a quadraphonic installation from scratch rather than trying to
convert things. By all means use your binaural recording s in it - but be
aware the interaural time differences can cause a slight phase difference
between speakers which can lead to comb filtering and a kind "weakening "
of the sound - I've never liked any of my binaural recordings over speakers
(I used those little soundman things)
Good luck!

On Fri, 5 Mar 2021 at 13:01, Marc Lavallée <m...@hacklava.net> wrote:


That's what I'm looking for: a simple bodge, to be able to use stereo
and/or binaural recordings that could be available instead of FOA
recordings; I don't want to miss opportunities to record something
interesting because I don't have a 5th order microphone, only for some
interactive entertainment...

Transaural can be amazing, and it could work for my use case...

Thanks for the tips. I may fail miserably, but it's worth a try.

Marc

Le 21-03-05 à 06 h 44, Dave Hunt a écrit :

Hi Marc,

Yes, this is very difficult to do properly but a simple bodge is

surprisingly effective. Undoing the built in binaural encoding from the
original recording is next to impossible.

I have done what is suggested in the ambisonic.net sources in Max. XY

or polar coordinates place the left and right channels at variable points
on a circle in a 1st order ambisonic encoder, giving a basic B-format
output. This image can then be rotated by fairly simple maths to alter the
coordinates of both channels together, or by rotating the B-format signal.
The rest is done by an ambisonic decoder.

Once in B-format, the WXY components can be manipulated; gain, eq,

directional dominance. You can also apply a Z coordinate to move the image
up and down.

The result is undeniably diffuse, but usable. Generally binaural

recordings sound OK as normal stereo, obviously without the proper spatial
impression.

Interesting effects are also achieved by treating stereo as UHJ and

deriving B-Format from that. I think there is something on that on
ambisonic.net, as well as super stereo and Dolby stereo.

Transaural crosstalk cancellation only works over a very small area, and

becomes more complex for quad. Many such systems go for some form of
closely spaced dipole speaker layout, possibly with extra speakers. The
University of Southampton had something like that, but references might
take some finding.

Ciao,

Dave Hunt



On 4 Mar 2021, at 17:00, sursound-requ...@music.vt.edu wrote:

From: Marc Lavallée <m...@hacklava.net>
Subject: [Sursound] binaural to FOA?
Date: 4 March 2021 at 13:55:42 GMT
To: Surround Sound discussion group <sursound@music.vt.edu>


I have a "back to the basics" question.

For a simple project I planned to record in FOA or HOA, but the final

render would be in simple quad (horizontal). So I don't need a lot of
resolution. I enjoy recording with binaural microphones (the kind that
looks like cheap earbuds), so I can record continuously without being
noticed.

So I wondered; is there a method to "convert" binaural to

horizontal-only FOA? Apparently there is:

https://www.ambisonic.net/quaduhj.html

http://www.ambisonic.net/ambimix.html

I guess my question is: what would be the software equivalent of a

pan-rotate device?

Marc

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