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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