[vorbis] what is floor?

[Vincent]

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?

<p>----- 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?

<p>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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