Dear all, my name is Fabio Wanderley and I am doing my research exactly on
the topic you are discussing. To implement what I am calling a 'Virtual
Studio' I have been through all possible implementations of head tracking
in ambisonic or binaural domain and beyond all this discussion about
localization cues what I have to share are my findings on head tracker
systems. Take a look on the MAX external developed by Dario Pizzamiglio, it
has been very useful to me despite the limited useful range. It is a head
tracking based on webcam and is performing very well in spite of being a
bit dependent of the webcam response.
http://www.lim.dico.unimi.it/HiS
See you
Fabio Wanderley
On May 26 2011, sursound-requ...@music.vt.edu wrote:
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Today's Topics:
1. Re: Sound Externalization Headphone (Hector Centeno)
2. Re: Sound Externalization Headphone (Bo-Erik Sandholm)
3. Re: Sound Externalization Headphone (Pierre Alexandre Tremblay)
4. Re: Sound Externalization Headphone (J?rn Nettingsmeier)
5. Re: Sound Externalization Headphone (Ralf R. Radermacher)
6. Re: Sound Externalization Headphone (Pierre Alexandre Tremblay)
7. Re: Sound Externalization Headphone (Marc Lavall?e)
8. Re: Sound Externalization Headphone (jim moses)
9. Re: Sound Externalization Headphone (Junfeng Li)
10. Re: Sound Externalization Headphone (Hector Centeno)
----------------------------------------------------------------------
Message: 1
Date: Wed, 25 May 2011 17:15:11 -0400
From: Hector Centeno <i...@hcenteno.net>
Subject: Re: [Sursound] Sound Externalization Headphone
To: Surround Sound discussion group <sursound@music.vt.edu>
Message-ID: <BANLkTi=xatam9hmmzkecbs-71zu8+m8...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Exactly what I've been exploring using ambisonic recordings from a
tetrahedral mic. I've been decoding to fixed HRTFs corresponding to
virtual speakers in a cube configuration. Good to know who was doing
it and when was already being done. I also made a head-tracking sensor
using an accelerometer, gyroscope and magnetometer controlled by an
Arduino Pro Mini:
http://vimeo.com/22727528
Cheers,
Hector
On Wed, May 25, 2011 at 4:06 AM, Dave Malham <dave.mal...@york.ac.uk>
wrote:
On 24/05/2011 20:00, f...@libero.it wrote:
<snip>
I should mention that interpolation of HRTF is not the only possible
technique; you can use for example a virtual loudspeaker array...
This is certainly the way that the Lake DSP system worked that they
demonstrated way back in 1993 (I think it's in the papers for the London
VR93 confence from that year but I don't have my copy of the proceedings
hand). The sounds were recorded in (first order) Ambisonics and the head
tracking drove a rotate/tilt algorithme that fed a decoder to virtual
speakers the signals from which were convolved with fixed hrtf's
corresponding to the speakers' positions that were fixed wrt the head,
mixed together and fed to the headphones.
? ? ? ? ? ? ? ? ?Dave
------------------------------
Message: 2 Date: Thu, 26 May 2011 09:11:16 +0200 From: Bo-Erik Sandholm
<bo-erik.sandh...@ericsson.com> Subject: Re: [Sursound] Sound
Externalization Headphone To: Surround Sound discussion group
<sursound@music.vt.edu> Message-ID:
<e023323b1ad21d44af70273b35e7501502c5e43...@esesscms0356.eemea.ericsson.se>
Content-Type: text/plain; charset="iso-8859-1"
Hi
You seem to have made a very advanced head tracking device,
Did you ever consider to use wii for head tracking?
http://rpavlik.github.com/wiimote-head-tracker-gui/
Wii headtracking in VR Juggler through VRPN
http://www.xs4all.nl/~wognum/wii/
http://www.wiimoteproject.com/
Regards
Bo-Erik
-----Original Message----- From: sursound-boun...@music.vt.edu
[mailto:sursound-boun...@music.vt.edu] On Behalf Of Hector Centeno Sent:
den 25 maj 2011 23:15 To: Surround Sound discussion group Subject: Re:
[Sursound] Sound Externalization Headphone
Exactly what I've been exploring using ambisonic recordings from a
tetrahedral mic. I've been decoding to fixed HRTFs corresponding to
virtual speakers in a cube configuration. Good to know who was doing it
and when was already being done. I also made a head-tracking sensor using
an accelerometer, gyroscope and magnetometer controlled by an Arduino Pro
Mini:
http://vimeo.com/22727528
Cheers,
Hector
On Wed, May 25, 2011 at 4:06 AM, Dave Malham <dave.mal...@york.ac.uk>
wrote:
On 24/05/2011 20:00, f...@libero.it wrote:
<snip>
I should mention that interpolation of HRTF is not the only possible
technique; you can use for example a virtual loudspeaker array...
This is certainly the way that the Lake DSP system worked that they
demonstrated way back in 1993 (I think it's in the papers for the
London
VR93 confence from that year but I don't have my copy of the
proceedings hand). The sounds were recorded in (first order)
Ambisonics and the head tracking drove a rotate/tilt algorithme that
fed a decoder to virtual speakers the signals from which were
convolved with fixed hrtf's corresponding to the speakers' positions
that were fixed wrt the head, mixed together and fed to the headphones.
? ? ? ? ? ? ? ? ?Dave
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------------------------------
Message: 3
Date: Thu, 26 May 2011 11:00:12 +0200
From: Pierre Alexandre Tremblay <tremb...@gmail.com>
Subject: Re: [Sursound] Sound Externalization Headphone
To: Surround Sound discussion group <sursound@music.vt.edu>
Message-ID: <e7ad28d3-ca72-49d8-93ac-d749db2c1...@gmail.com>
Content-Type: text/plain; charset=us-ascii
so what happens is you take the positions of the speakers you want to
simulate, and convolve each speaker signal with the appropriate
head-related transfer functions for the left and right ear.
Can I bring a concern here? I have compared different IRs of 5.1 setup
with real, mastered 5.1 programme and the loss was very significant,
mainly in term of comb filtering type artifacts. So much so that I
decided not to include them on my album (this was for a 5.1 release which
I wanted to have the stereo reduction to be binaural)
Now I know that using generic HRTF is not going to help me, but this was
far worse than anything I could imagine...
I presume that if I had used Ambisonic as my spacialisation device
throughout the mix and composition, it would have worked better as a
re-rendering...
my 2 cents
pa
------------------------------
Message: 4
Date: Thu, 26 May 2011 11:08:19 +0200
From: J?rn Nettingsmeier <netti...@stackingdwarves.net>
Subject: Re: [Sursound] Sound Externalization Headphone
To: sursound@music.vt.edu
Message-ID: <4dde1883.2030...@stackingdwarves.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 05/26/2011 11:00 AM, Pierre Alexandre Tremblay wrote:
so what happens is you take the positions of the speakers you want
to simulate, and convolve each speaker signal with the appropriate
head-related transfer functions for the left and right ear.
Can I bring a concern here? I have compared different IRs of 5.1
setup with real, mastered 5.1 programme and the loss was very
significant, mainly in term of comb filtering type artifacts. So much
so that I decided not to include them on my album (this was for a 5.1
release which I wanted to have the stereo reduction to be binaural)
hmm. interesting. can you share a short snippet of the original 5.1 and
the binaural rendering, one that shows those artefacts?
I presume that if I had used Ambisonic as my spacialisation device
throughout the mix and composition, it would have worked better as a
re-rendering...
why should it? the virtual speaker approach is pretty much independent
of your speaker spatialisation technique.
*.*
btw, since nobody has mentioned it in this thread yet, there is the
soundscape renderer from tu berlin/telekom labs. it is available as
open-source code and has just seen a new release:
http://www.tu-berlin.de/?id=ssr
there's also a wealth of papers out there describing its workings and
applications in listening tests and other studies.
best,
j?rn
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