[vorbis] [new?] Streaming technique

[Alex Iribarren]

Hi,
I have a newbie question, and a not-so-newbie one. I've just found 
out about Ogg, and I haven't been able to find a clear answer in 
the many webpages this proyect has (btw, why not create just one 
site instead of vorbis.com, ogg-vorbis.com...).
The question is, does Ogg use perceptual coding, like mp3 does? And 
if so, would it be possible to build an encoder in such a way as 
to take one input stream and make it produce 2 different files? One 
file encoded at 64kb, and the other file with the information dropped 
from the stream that would have made the resulting encoded stream 
128kb? What I mean is a way to produce 2 64kb files which could be 
somehow "added up" on the decoder to produce a 128kb stream. Is there 
a name for this kind of thing, or have I just made it up?
I hope I've made myself clear enough, but if not just say so and 
I'll try to explain better.
 
TIA,
Alex

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