Gabriel Bouvigne schrieb am Son, 24 Sep 2000:
> So the highest subbands don't have any scalefactor? I know that Brandebourg
> said that there is no proof that >16kHz really contribute to the hearing of
> the music, and then it could be intentionnal, but could it be a "bug" or
> mistake in the mp3 specs?
The only thing you can do for the highest bands is adjusting
the global quantizer stepsize and then try to color the bands
where you have scalefactors for. This would require to compute
masking for sfb21 (sfb12 for short blocks).
> After all, I think that in 48kHz encoding some freq higher than 16kHz got a
> scalefactor, so it could be theorically be possible to affect a scalefactor.
> Is there a scalefactor for >16kHz in AAC? (Meno, are you listening?)
>
>
> Also an off topic question for Robert: as you're german, is there a specific
> knowledge about audio compression floating around in your university? (like
> specialists, research or thesis)
Well, to my shame I must say, that I don't know if there are any
audio experts at the University of Dortmund.
All I Learned About Mpeg Encoding I gathered in the last year
joining the LAME project in my spare time.
A book I own for a few days that I can recommend is:
"Psychoacoustics, Facts and Models", E. Zwicker, H. Fastl; Second
Updated Edition, Springer Series in Information Sciences 22; 1999
ISBN 3-540-65063-6, ISSN 0720-678X
> Regards,
>
>
> --
>
> Gabriel Bouvigne - France
> [EMAIL PROTECTED]
> mobile phone: [EMAIL PROTECTED]
> icq: 12138873
>
> MP3' Tech: www.mp3-tech.org
Ciao Robert
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