[vorbis] Ogg radio stations (was: Another new famous game using VORBIS!!!)

[Mark Hills]

> If by "stereo processor" you mean a multiband dynamic range compressor
> (like an Optimod), then DON'T. Those give any psychoacoustic lossy
> encoder a hard time, by bringing more sounds above the psy-curve. Use a
> wideband limiter-compressor by all means, but not a multiband one.

We were using an old 5 band AM processor. Which as you can imagine is 
hideous for a compressed webstream because of all the AM things it does 
like clipping bass and the like.

We now have a simple three band processor with compressor and AGC
connected at the moment. I'd be really interested to know a bit more
detail as to why multiband compression is so evil to the vorbis process.

I don't know much about the inner workings of the Vorbis codec, but is it
something to do with the process being modelled toward more `natural'
proportions of different frequencies present in the sound? Could this be 
something associated with the fact that over webstream, pure speech with 
no background music begins to sound squelchy, even at high bitrates?

Mark

-- 
Mark Hills
mark.hills at urn1350.net
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