I've got a paper about an enhanced psy model somewhere on my hard drive.
I'll search about it. I'll put it on my site as soon as I'll found where it
is.
Gabriel Bouvigne - France
[EMAIL PROTECTED]
icq: 12138873
MP3' Tech: www.mp3tech.org
----- Message d'origine -----
De : Mark Taylor <[EMAIL PROTECTED]>
� : <[EMAIL PROTECTED]>
Envoy� : mardi 8 juin 1999 02:38
Objet : Re: [MP3 ENCODER] limit bitrate switches
> >
> > Hi,
> >
> > I think it will be useful to have (optional) switches for limiting
maximal
> > and minimal bitrate in VBR mode. I did some sound tests and I decided
that
> > at least minimal bitrate should be forced - I discovered indication of
> > strange artefacts (distortion?) at high freq even with -V 0. What is
> > Your opinion, Mark?
> >
>
> I agree. Having no minimum means you have complete faith in the
> psycho-acoustic model. (-b will set the minimum bit rate, by the way)
>
> -V 0 means no audible distortion, as measured by the psycho-acoustic
> model. The encoded frame can still have a very large amount of
> distortion, as long as the psy model claims that the distortion
> will be masked (and not audible). Errors in the psy model
> can thus lead to distortion even with -V 0.
>
> It would be nice to have a better psy-model, but I dont know
> of any in the literature other than the one we have.
> I've read papers on PAC and AAC, and they both claim to use the
> MP3 psy-model.
>
>
>
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>
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