e: [Vorbis-dev] 5.1 surround channel coupling

[Martin Leese]

Sebastian Gesemann <sgeseman at uni-paderborn.de> wrote:
...
> According to
> http://en.wikipedia.org/wiki/Ambisonics#Possible_combinations
> the different Ambisonics flavours including UHJ can be uniquely
> idenfified by its channel count.

Not quite.  There can be three-and four-channel
UHJ files, and these clash with three- and four-
channel B-Format files.  Two-channel UHJ is
compromised in that you cannot completely
recover the original B-Format channels.  This is
not the case with three- and four-channel UHJ,
so using these would be better if they can be
kept stereo compatible.  This is discussed at:

http://wiki.xiph.org/index.php/Ambisonics#Limitations_of_the_.22.uhj.22_specification

Also, with B-Format the channel count is unique
only up to third order.  This is discussed at:

http://wiki.xiph.org/index.php/Ambisonics#Limitations_of_the_.22.amb.22_specification

with a slightly expanded table further down.

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