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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