[LAU] upwards compression

[Fabio]

Em Sat, 25 Dec 2010 15:00:06 -0500
Jeremy <jeremybubs at gmail.com> escreveu:

> On Sat, Dec 25, 2010 at 2:45 PM, Fabio <capoeirista at arcor.de> wrote:
> 
> > Em Sat, 25 Dec 2010 13:48:07 -0500
> > Jeremy <jeremybubs at gmail.com> escreveu:
> >
> > > It seems like you would want to do normal compression with a very
> > > low threshold (about the noise level) and a negative ratio.
> > >
> > > then you end up with a curve like
> > >
> > >        \
> > >    /         \
> > > /                  \
> > >
> > > Then you can add that into your original signal, to get something
> > > approximating "upward compression".
> > >
> > > Also, perhaps the expander from tap-plugins might do what you
> > > want: http://tap-plugins.sourceforge.net/ladspa/dynamics.html
> > >
> > > <http://tap-plugins.sourceforge.net/ladspa/dynamics.html>Jeremy
> > >
> > > On Sat, Dec 25, 2010 at 12:40 PM, Fabio <capoeirista at arcor.de>
> > > wrote:
> > >
> > > > Em Sat, 25 Dec 2010 17:09:54 +0000
> > > > Q <lists at quirq.ukfsn.org> escreveu:
> > > >
> > > > > upwards compression does it by boosting the volume of the
> > > > > quietest signals -- compressing from the bottom up. This
> > > > > parallel processing produces upwards compression as Joern
> > > > > expounded on my original statement
> > > >
> > > > ok, thats what i want
> > > >
> > > > perhaps my math is to weak...lol
> > > >
> > > > I simply will try it out.
> > > >
> > > > just giving more info: amateur-singer, half an hour of time,
> > > > lives long from here. we recorded her voice, but in the lower
> > > > parts she sang very quiet, so with normal compression i would
> > > > compress 95% of what is correct only to add more gain to those
> > > > parts. so i thought about this option instead. probably i
> > > > should simply elevate volume in those part instead.
> > > > _______________________________________________
> > > > Linux-audio-user mailing list
> > > > Linux-audio-user at lists.linuxaudio.org
> > > > http://lists.linuxaudio.org/listinfo/linux-audio-user
> > > >
> >
> >
> > that's not possible
> >
> >
> > curve has to be like this: (hope this will be look the way it looks
> > like here)
> >
> >                   .
> >                 .
> >               .
> >             .
> >           .
> >     .
> > .
> >
> >
> > but like i said, none of the compressors i have installed can do
> > this (and I have a lot)
> >
> 
> Well, normally, you might have a ratio like 3:1.  What you are
> demonstrating is a ratio of 1:3 or the like.  I was suggesting a
> ratio of -1:3 or so.  I'm not sure if compressors have options to do
> a 1:3 ratio, or -1:3 ratio, but they would look like you and I
> suggested (respectively).
> 
> Jeremy

they can't....neither one neither the other

but i had a look at your link from the tap-plugins, and it looks like
 in tap-dynamics i can create a function like this.

thanks