[vorbis] Some channel coupling questions

[stoffke at directbox.com]

Hello,
going through the vorbis stereo specifications, and trying to figure out 
how it works, I wonder *where* actually the two types of channel coupling 
take place during the encoding process.
As I understood, there are two basic types of channel coupling- 
one is the square polar mapping and the other one is channel interleaving.
Square polar mapping is done after computing the floor curve of each channel, right ?
Whereas channel interleaving takes place during vector quantization the residue vectors -
to save space, the left/right residue vectors are merged into one.
Is that correct ?

Maybe you could help me, 'cause right now I'm working on a more gereral, 
not that much technically detailed description of the Ogg Vorbis encoder. 

Thanks
Stoffke

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