[vorbis] Fwd: Re: Clarification on pshycho-acoustic in Vorbis (your non-MP3 guide)

Beni Cherniavksy cben at techunix.technion.ac.il
Thu Oct 25 00:39:48 PDT 2001

After reading http://mp3.radified.com/mp3.htm I sent Rad an explanation of
some things as I understand them.  He liked it and posted it on his site
(still unlinked, use the URL below).  Can somebody with better
understanding of psycho-acoustic terms and the vorbis model check it and
comment on it?  In particular I didn't know how vorbis handles
quantization noise.  If you reply with corrections, CC:
<Rad at radified.com>.

On Wed, 24 Oct 2001, Rad wrote:

> Beni,
> Thanks for the note. I found it most helpful, so much so that I posted it on
> my site:
> http://mp3.radified.com/ogg_psycho_models.htm
> I cleaned up the grammar a bit, and tried to maximize readability.
> Perhaps you could review it & ensure that I didn't change the actual meaning
> of any parts.
> Is it okay that I included your email addy? I can remove it if you don't
> want it there.
> Thx again,
> Rad
> Laguna Beach, Ca.
> ----- Original Message -----
> From: "Beni Cherniavksy" <cben at techunix.technion.ac.il>
> To: <Rad at radified.com>
> Sent: Wednesday, October 24, 2001 8:01 AM
> Subject: Clarification on pshycho-acoustic in Vorbis (your non-MP3 guide)
> > Your guide (ripping, Page 6 of 7) says:
> >
> > While MP3's version of VBR uses psycho-acoustic models, Ogg is
> > based solely on noise, masking, coupling and ATH thresholds. I
> > have no idea of what that means, but I read that's how I heard it
> > works. =)
> >
> > These _are_ exactly aspects of a psycho-acoustic model.  ("Most people eat
> > soups but he eats boiled water with vegetables and other additions").
> > I'm not a specialist but I've got quite a good idea of them (I hope :).
> > BTW, I like Vorbis very much, so you'll see a bias ;).
> >
> > [rest omitted, see http://mp3.radified.com/ogg_psycho_models.htm]

Beni Cherniavsky <cben at tx.technion.ac.il>
                 (also scben at t2 in Technion)

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