Sorry I am a little behind on the latest threads.

Bob Carver's Sonic Hologram was a pioneering attempt at crosstalk cancelation.  
Considering the processors he had to work with, is amzing that it works as well 
as it did.  He once told me that the little box version was the best seller he 
ever had.  After hearing an Ambiophonic demonstration he decided to again 
include the sonic holography feature in his Sunfire home theater products. 
 
But it had the following difficulties.  It was not recursive so that it only 
cancelled the initial crosstalk and not the next crosstalk caused by 
the first cancellation and so on.  It had almost no adjustments for speaker 
angle and the box did not allow for the speakers to be placed much closer 
together where the results would have been much better especially for the 
pinna.  It also did cancellation at frequencies where there was no crosstalk to 
cancel.  The result was that the sweet area was small and many users could not 
really get it working with their speakers and rooms.  The Lexicon Panorama mode 
had similar problems.

Ralph Glasgal
www.ambiophonics.org   

________________________________
From: Robert Greene <gre...@math.ucla.edu>
To: Surround Sound discussion group <sursound@music.vt.edu>
Sent: Thu, February 24, 2011 1:15:40 PM
Subject: Re: [Sursound] cross-talk cancellation used in binaural sound 
reproduction

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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