[vorbis-dev] vorbis.com

[Frank Klemm]

On Sat, Dec 30, 2000 at 08:40:35AM +0100, Segher Boessenkool wrote:
> 
> Monty wrote:
> > 
> > > > I don't know the details of how this is meant to work, though, except that
> > > > it's mostly codebook trickeruy.
> > >
> > > I believe the method is: just truncating the packets, and losing the
> > > high-frequency part of the music.
> > 
> > The frequency domain can also be progressively filled in multiple
> > passes; packet truncation loses resolution as opposed to being a rough
> > lowpass.  This code isn't all there yet.  It's one of the last things
> > that has to be ready to declare 1.0.
> 
> So if we use cascaded codebooks, the "lower granularity" codes should
> be first in the stream?
> 
In MP3 80% of the bitrate comes from the bandwidth, 10% from channel
coupling/decoupling and 10% from the NMR. Between 32 and 192 kbps the NMR
changes by about 3 dB, that's 0.5 bit.


-- 
Frank Klemm

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