Hi Junfeng,
If absolute accuracy of the crosstalk cancellation filters is what you
are after then I would also recommend the algorithm described in
O. Kirkeby, P. A. Nelson, H. Hamada, and F. Orduna Bustamante (1998a)
"Fast deconvolution of multichannel systems using regularization" IEEE
Transactions on Speech and Audio Processing, vol. 6, pp. 189-94.
I used it for my PhD with very pleasing results and can send you matlab
code for it if you like. By measuring the in-room HRTF of your listener
for the speaker setup you are using and designing a filter specially for
him/her it is actually possible to synthesise a virtual source which is
indistinguishable from a real loudspeaker. You do have to be very
regimental about your experiment setup though.
Best regards,
Alastair
Junfeng Li wrote:
Hello,
Thanks a lot for so valuable comments and active discussions.
While, possibly I did not give a clear explanation of my problem before.
therefore, I would like to show the problem again more clearly.
I am starting to research on 3D audio reproduction using two/three
loudspeakers.
therefore, I began with build up a real-time 3D sound reproduction system
with two loudspeakers, based on binaural technique (HRTF, BRIR, etc.).
Basically, we can reproduce 3D sound by simply convlving signal and HRTF,
the synthesized signal in this way is OK for listening using headphone.
While, when presenting this synthesized signal using loudspeakers, the
spatial sensation will be distorted, because of the cross-talk problem.
Thus, we must design cross-talk cancellation algorithms to recover the
spatial sensation even if using loudspeakers.
I am now confusing how to implement an efficient cross-talk cancellation
algorithm for this application.
In fact, I did one cross-talk cancellation, while it cannot effectively
work. Therefore, I am now consulting you whether anyone can show some more
comments on this issue, and share some source code for this technology.
Thank you so much.
Best regards,
Junfeng
2011/2/25 Marc Lavallée <m...@hacklava.net>
It is similar: The Carver C-9 is cancelling one occurence of cross-talk by
mixing in to each channel a delayed inverted copy of the other channel,
while the RACE algorithm cancels the following cross-talk occurences
recursively because the mixed delayed inverted signals must also be
cancelled...
Le 24 février 2011, Robert Greene a écrit :
In detail, I think, yes it is different.
It is designed for a certain angle and distance
which are different at least from RGs stereo dipole
where the speakers are close together in front of the listener.
But I do not see any reason why the whole thing could
not be easily programmed up. After all, any analogue
(determanistic) process can be digitally modeled
as accurately as one wishes.
I am unaware whether anyone has done it.
It is fun to play the Sonic Hologram--I pull mine
out every one in a while,
Robert
On Thu, 24 Feb 2011, Peter Lennox wrote:
Is it so different from Ralph Glasgal's ambiophonic cross-talk
cancelling? Dr Peter Lennox
School of Technology,
Faculty of Arts, design and Technology
University of Derby, UK
e: p.len...@derby.ac.uk
t: 01332 593155
w: http://sparg.derby.ac.uk/SPARG/Staff_PLX.asp
________________________________________
From: sursound-boun...@music.vt.edu [sursound-boun...@music.vt.edu] On
Behalf Of Michael Graves [mgra...@mstvp.com] Sent: 24 February 2011
22:16
To: Surround Sound discussion group
Subject: Re: [Sursound] cross-talk cancellation used in binaural sound
reproduction
I have a Carver C-9 Sonic Hologram unit that I bought on Ebay for about
$80. It's a nice little demo piece, but limited in its application.
That said, it's biggest problem is noise. Of course it's all analogue
and built around -10 dbm levels. And all those capacitors are now very
old.
Has this sort of thing evern been implemented in code, like a VST
plug-in? Ideally it would be nice to have it available within the
plug-in architecture of the Logitech Squeezeserver that we use for
casual audio playback. There are even limited implementations of room
correction done in that manner.
Michael
On Thu, 24 Feb 2011 10:15:40 -0800 (PST), Robert Greene wrote:
I suppose that someone ought to mention-so I shall--
the Carver Sonic Hologram.
You can still find the devices around(they were
crosstalk cancellation processors).
They work really well, if you do not
mind sitting really still in one spot
(which of course you are going to have
to do for any such system with only two speakers).
And the nice thing is the Sonic Hologram sounds good-
it does minimal damage to the music.
It is interesting--sort of tells you where the industry was
and still is on surround and so on--that Martin Colloms
writing about the Sonic Hologram in HiFiNews
says that it definitely makes stereo better [and potentially
much better] but that it is just too much trouble...
Robert
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