[LAU] ambiophonics vs. ambisonics?

[Martin Leese]

J?rn Nettingsmeier <nettings at folkwang-hochschule.de>
...
> and there's an excellent MAG article about using 4 speakers for better
> stereo replay here:
> http://www.audiosignal.co.uk/Resources/Surround_sound_from_2-channel_stereo_A4.pdf
> nothing to do with ambisonic decoding, though.

This is just the old Hafler circuit.  It doesn't
really compare with Ambisonics.

Gerzon's contribution to the Hafler circuit was
the addition of a blend or rear spread control
between the rear speakers and ground.  This
is described in his later article "A year of
surround-sound", also available at The Gerzon
Archive:
http://www.audiosignal.co.uk/Gerzon%20archive.html

The Hafler circuit is also available at:
http://members.tripod.com/martin_leese/Audio/

Regards,
Martin
-- 
Martin J Leese
E-mail: martin.leese  stanfordalumni.org
Web: http://members.tripod.com/martin_leese/