[Vorbis] Square Polar Stereo Coupling

[xiphmont at xiph.org]

On Thu, Jul 16, 2009 at 12:36 PM, Jesús Díaz
Vico<jesus.diaz.vico at gmail.com> wrote:
> Hello,
>
> I've read http://xiph.org/ogg/vorbis/doc/stereo.html and the Vorbis specs,
> but I haven't got a clear concept of how does the Square Polar Mapping
> works.

The idea is to turn two magnitude vectors into a magnitude vector with
most of the energy and an angle vector with much smaller values.

With more than two channels, the coupling happens in a tree until, for
example, you end up with one magnitude vector and n-1 angle vectors.

Monty