[Vorbis-dev] Mapping = 1 Ambisonic Vorbis flag

[Paul Martin]

On Mon, Sep 08, 2008 at 12:33:07PM +0100, Paul Martin wrote:
> On Mon, Sep 08, 2008 at 09:25:08AM +0000, Oliver Oli wrote:
> > 1:  W
> > 2:  WX
> > 3:  WXY

> (Incidentally, you don't need a separate representation for middle/side, as
> Ambisonic's "WX" is equivalent.)

As Richard Furse has pointed out off-list, WY is the correct encoding for
mid-side. Suggestion 2 above would therefore be better as WY rather than WX.

The axes of the first order components are:

W is omnidirectional.
X is +front -back
Y is +left -right
Z is +up -down

It's no coincidence that Ambisonic components look like atomic orbitals.

http://members.tripod.com/martin_leese/Ambisonic/Harmonic.html
http://en.wikipedia.org/wiki/Atomic_orbital

-- 
Paul Martin <pm at nowster.org.uk>