> > MP3 uses 576 and 192. When 576 is too low for tonal music and 192 too
long for
> > percussions, then this is right. But a 1:8 ratio can create other
problems.
> > Note that MD uses 128, 256, 512 and 1024 sample blocks.
> > Useful are block sizes from 1 ms ... 35 ms.
Minidisc also uses mixed windows. Perhaps mixed windows would help in our
case.
I've got another question about window sizes: are the short ones really
essential in VBR? Would it be possible to only use long ones, and then
allocating a lot more bits in the case of transcients? After all, Xing uses
only long ones, and does a not so bad job for transcients for an encoder
using only long ones. (note: I'm not saying that Xing is a reference in term
of quality)
> > 5.
> > Spectral prefiltering to get nearly constant ATH in every CB.
Why can we read in the litterature that humans got 25 CB but mp3 uses only
22?
> I believe noise shaping is the main difference between different MP3
> encoders. I'm sure MPEG did not document any good noise shaping
> algorithms on purpose :-) There are a few simple things in the
> literature, but I've never found any documentaion of a noise shaping
> algorithm used in an actual commercial encoder.
Have you tried digging into audio patents? It would perhaps bring an idea.
Regards,
--
Gabriel Bouvigne - France
[EMAIL PROTECTED]
mobile phone: [EMAIL PROTECTED]
icq: 12138873
MP3' Tech: www.mp3-tech.org
--
MP3 ENCODER mailing list ( http://geek.rcc.se/mp3encoder/ )
