Bo-Erik Sandholm wrote:
Here I am again, pushing for someone to do something for us ambisonic users :-)
I have been inspired by Hectors ambiexplorer app that was not
compatible with my old android phone.
https://play.google.com/store/apps/details?id=net.hcenteno.ambiexplorer&hl=en
The goal is to listen to a first order .amb file using head tracking.
Can it be simply done with windows or linux ?
I think the components are almost here,
DIY Headtracker for a cost of around 30 us $ controlling the b-proc
VST followed by a VST for FOA B-format to Binaural output could be one
solution.
DIY head tracker
ww.rcgroups.com/forums/showthread.php?t=1677559
http://www.rcgroups.com/forums/showthread.php?t=1677559&page=6
- Quick start
Code and GUI can be found at google code
http://code.google.com/p/open-headtracker/
It took 4 weeks to get the hardware from china, and around 2 hours for
me as a complete aurdino rookie to connect the sensor to the Aurdino
nano and load the headtracker software.
It streams outputs strings like this 33.12,53.24,56,34 with the 3
xyz sensor values over the usb port showing up as a serial port on
windows.
I remembered I had seen this:
http://www.york.ac.uk/inst/mustech/3d_audio/vst/bproc_help.html
B-Proc allows you to rotate, tilt and tumble a complete first order
B-Format soundfield. The order that these operations occur in is
important, since it affects the final orientation of the soundfield,
as all operations are with respect to the central listening position
B-Format to Binaural
Any B-format to Binaural output or this faking it:
http://vvaudio.com/downloads
VVmicVST as output according to this description
For something easier which works well, try back to back cardioids
- pointing them slightly forward
- going slightly hyper.
I like this very simple decode.
Used to use this a lot on Soundfield recordings when you couldn't do nowt
but listen straight from the headphone output. Like Ricardo says, works
well - with head tracking I'm pretty certain it would be fantastic -
dw
I think dw wrote the above
OR http://www.tech.dmu.ac.uk/~dylan/z/dylan/teach/
Multitrack spatial production:
Ambisonic / Multichannel / Binaural
Or any other Ambisonic to Binaural VST.
At the moment I belive the only missing glue is to be able to use the
serial input stream to control B-Proc. If I am to do it I know it will
take a long time :-)
If the complete solution is running on windows, linux or android. I do
not care, I know Hector is looking in to a solution for the current
ambiexplorer android app so you don't need to tape the phone to your
head.
Any pointers to do this with other software than my take on this is welcome.
Best Regards
Bo-Erik Sandholm
Stockholm Sweden
Hector and Bo-Erik, I can only say: Bravo!
This is a significant development, and some "reference hardware kit" for
Ambisonics reproduction via (HT) headphones seems to be very close.
Contrary to some important American audio gurus you didn't need any
Kickstarter funding/ressources to realize your project... O:-)
If the complete solution is running on windows, linux or android. I do
not care, I know Hector is looking in to a solution for the current
ambiexplorer android app so you don't need to tape the phone to your
head.
OK: I'd say the "phone taped to your head" was a beautiful albeit
desperate idea. ;-)
DIY Headtracker for a cost of around 30 us $ controlling the b-proc
VST followed by a VST for FOA B-format to Binaural output could be one
solution.
For a real-world application (next stage?), you might have to think how
to connect a headtracker or headtracker-module to your mobile phone and
other devices. (Interface question)
You can keep the Arduino hardware base, but you might use some
additional Bluetooth module to provide the (necessary?) wireless link.
Don't forget to include some battery on the small tracker board, and you
already have a solution which would work for every headphone on the
market. (Excluding the fact that different operating systems need
different software, unless a general solution - which could be based on
JavaScript or Java - will be found. I am not sure if this is possible in
this specific case, but probably yes.)
Best,
Stefan
P.S.: For me and if the price is ok :-) , I would buy such a "audio
headtracker-module". Cos I would not have to wait some 4 weeks for some
ordered hardware components from China...
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