[Vorbis-dev] 5.1 surround channel coupling

[Qduaty]

2007/1/19, Ivo Emanuel Gonçalves <justivo at gmail.com>:
>
> You could look in the MIT library for audio engineers, I suppose.  The
> more important thing you'll need is probably proper equipment for
> testing.


But what about the implementation in Vorbis? As I understand, Vorbis
supports 2-channel coupling. This implies all multichannel surround models
must have 2^n channels. There may be two ways to deal with it:

1. Implement n-dimensional channel coupling
2. Treat 5.1 dolby digital content as 4-channel surround + 2 independent
channels (dialogs + LFE)

In the second case, we can use two models of quadrophony:
a) independent coupling for front and back channels, then coupling front
with back
L  --  R
     |
L' -- R'

b) generate two perpendicular pairs of channels, which gives us possibility
of mixing down the dialog channel into the Front. Both pairs could be
coupled independently:
         Front
Left     +       Right
         Back

What you people think about it? ;)
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