[Vorbis-dev] Ambisonics in Ogg Vorbis

[Paul Martin]

On Mon, Apr 16, 2007 at 06:01:00PM +0100, Ian Malone wrote:
> Sebastian Olter wrote:
> >2007/4/16, Ian Malone <ibmalone at gmail.com>:
> >>
> >>What would be a useful goal would be a way to strip streams
> >>down to Vorbis I compatibility.
> >>
> >Vorbis I uses point channels (we install speakers in these points and so it
> >plays), Ambisonics instead uses mono + directional channels, which can be
> >expressed as microphones. It's a different approach to stereo and it needs a
> >different player. What good is a mono playback?
> 
> Better than nothing.  It is of course a very minor goal
> compared to working Ambisonics (which would be excellent).

Getting stereo from Ambisonics is a very simple job -- just a matter of
which matrix you multiply with. The crudest way would be to use L=(W-X)/2
and R=(W+X)/2 and ignore all other channels.

-- 
Paul Martin <pm at zetnet.net> (work)
  <pm at nowster.zetnet.co.uk> (home)