[vorbis] Vorbis determined to be as good as MPC at 128 kbps!

[Monty]

On Thu, May 27, 2004 at 09:56:37AM +0200, Giuliano Pochini wrote:
> 
> On 27-May-2004 Monty wrote:
> 
> > The HF boost is a modern example.  Sebastian's paper correctly
> > identifies one major source of the slight HF boost people noticed
> > in Vorbis some time ago. The solution he suggests is also perfectly
> > workable.  However, it can also be corrected more flexibly by
> > extending noise normalization to properly correct for all energy
> > gains/losses during quantization, and that is the way I plan to
> > handle it in the next major reference encoder release.
> 
> Most of the tweaking to reduce HF boost (at least until 3/2004) were
> aimed to fix the symptom, not the cause of the problem. ie. they
> were developing filters that makes the frq response flat. It's a
> kludge IMO. I don't know what "extending noise normalization" means,
> but I really hope it will finally fix HF boost properly because it
> makes encoded files very easy to ABX.

Right, and often fixing the symptom is fast and generally works.  I
don't want to discourage people from adopting fast fixes that work (so
long as they really do work), but things like the HF boost indicate a
shortcoming in the underlying model that needs to be eliminated.

Monty
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