[vorbis-dev] Spectral phase information in residue vectors

[Stoffke]

I found this sentence in the Ogg format specs:
http://www.xiph.org/ogg/vorbis/doc/vorbis-spec-res.html 
"A residue vector may represent spectral lines, spectral magnitude, spectral phase or hybrids as mixed by channel coupling."

But where does the spectral phase information come from ?
AFAIK  MDCT doesn't provide any phase information.
And in OGG-encoding, MDCT is taking place a few steps before computing
the residue vectors.

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