[vorbis-dev] Re: SBR

[Jussi Ekholm]

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Pontus Carlsson <pontus at popwire.com> wrote:
> Because SBR uses a totally different technology that is independent
> of the underlying codec.. It has nothing to do with mp3. It has been
> tested with for example AAC, boosting it about 30%.. And that
> together with Dolbys or Fhg's implementation of AAC surely beats
> Ogg. So however good a codec is, SBR could make it better.. Mostly
> for lower bitrates though (<90kbit/s or so) as the technology is
> about "guessing" the higher frequencies using the correlation
> between lower and higher spectral bands.

I apologize for being this ignorant, but I would be very pleased if
someone would give me some reading about SBR (I'm not completely sure,
but isn't this abbreviated from Spectral Band Replication?). I tried
to search Google, but mostly I just ran into messages from different
mailing lists and to pages with language other than english; maybe my
searching "technique" sucks, but anyway... I would be very much
interested to read more about this.

Once again, sorry for posting this kind of stuff at vorbis-dev. It's
just, that I ran across to so many different abbreviations and terms
I cannot comprehend. To mention one term; "artifact" - I don't have
any clue about what it is when speaking about compressed music, other
than that it could somehow be related to some crappy sound in some
music file or something like that. :-)

Thanks for your patience (that is, if you had any)!

- -- 
Jussi Ekholm <ekhowl at goa-head.org> | <http://erppimaa.ihku.org/> | <0x1410081E>
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