[vorbis] what is floor?

[Vincent]

i can be more precise in my question:

i understand that a floor is a spectral image of a chanel.
but i don't understand how the residue is calculated.

<p>----- Original Message -----
From: "Vincent" <vincent.tiberghien at fsatie.ac.za>
To: <vorbis at xiph.org>
Sent: Friday, October 03, 2003 2:57 PM
Subject: Re: [vorbis] what is floor?

<p>> hello,
>
> can someone please explain me how "floors" work.
> how are they normalized?
> i got this from the xiph.org web site, and i don't understand it very
well:
>
> "Vorbis I stream first generates from input audio a spectral 'floor'
> function that serves as an MDCT-domain whitening filter. This floor is
meant
> to represent the rough envelope of the frequency spectrum. This floor is
> subtracted from the log frequency spectrum, effectively normalizing the
> spectrum by frequency"
>
> can someone explain me?
>
>
> ----- Original Message -----
> From: "John Morton" <jwm at eslnz.co.nz>
> To: <vorbis at xiph.org>
> Sent: Saturday, September 27, 2003 7:54 AM
> Subject: Re: [vorbis] how long until 1.1?
>
>
> On Saturday 27 September 2003 17:50, you wrote:
> >  On Fri, 2003-09-26 at 19:38, John Morton wrote:
> >  > On Saturday 27 September 2003 07:26, you wrote:
> >  > >  Here's the provisional release notes:
> >  > >
> >  > >  http://wiki.xiph.org/Release101
> >  >
> >  > Has the patch to split the float to int conversion code into a
separate
> >  > function ended up in CVS anywhere? I can resubmit it to someone, if
> >  > there's any interest in including it.
> >
> >  That seems to have slipped my brain.  Can you point me to the original
> >  submission?
>
> http://www.xiph.org/archives/vorbis-dev/200305/0011.html
>
> The patch against what was then mainline CVS was pretty much the same as
the
> one against 1.0, so it should be straight forward to reapply and examine.
>
> John
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