[vorbis] About the high frq boost...

[Giuliano Pochini]

On Mon, 3 May 2004 18:38:08 +0200 (CEST)
Sebastian Gesemann <sgeseman at upb.de> wrote:

> Hi Giuliano,
> 
> GP> Is someone working on the infamous high frequency boost
> GP> effect ?   S.Gesemann published an interesting paper
> GP> three months ago.
> 
> http://www.xiph.org/minutes/2004/april/raw/
> ( 21:16 ... )
> 
> Actually the paper only examines the boost effect provoked
> by quantization. There's also a boost affect provoked by the
> lossy stereo coupling in quality modes below 6.

Yes, I'm aware of that one, but from some tests I did a lot of time ago I
saw it is very small compared to the boost you analyzed.

<p>> According to Monty's response he's working on fixing both
> issues for the next release.

:)

<p>> You may also want to test some (experimental) encoder versions
> by Quantum Knot (aka Steven So) and others which try to reduce
> the point-stereo energy boost effect. Some of these have proven
> to be better than the official encoder by using double blind
> tests. (check out www.hydrogenaudio.org for more details)

Some of them are binaries for windos only. I'll give it a try even if I
can't help much.

<p><p>
--
Giuliano.
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