[vorbis-dev] Spectral phase information in residue vectors

[Alan MacDonald]

Stoffke wrote:

> 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.

<p>The MDCT itself does not provide phase information, but I believe the 
spectral phase referred to here is in reference to the values stored in 
the residue after channel coupling.  It's the phase relationship between 
two values, the left and right channels, that are stored in the residue, 
if channel coupling is used.

Hope that helps,
Alan

<p><p>--- >8 ----
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