Re: [Sndobj-devel] Parametric equalizer

[Victor L. <vic...@nu...>]

I'll have to check TpTz.

But perhaps you can combine the
original signal with the butterworth signal and
apply two different gains. Rasing the gain of the
BP signal would emphasise that freq band, but the others
would still pass. There might be some funny phase
interaction between the filter and the original signal,
so I can't say it will work.

Victor

>
> Wouldn't this reject everything outside the BW of the
> filter?
>
> I have tried combining a butterworth band-pass with a
> band-reject (in parallel), but they don't combine well.
> You can hear the change at unity gain. I thought there was
> probably a better way, so I dropped it.
>
> I want to be able to vary the gain on a range of
> frequencies without changing other frequencies much.
>
> BTW, I have been looking around more and I have found a
> set of equations for coefficients that should do what I
> want.
>
>
http://www.madstudio.lsu.edu/references/music/csound/manual/sigmod/pareq.htm
>
> But I have not yet gotten them to work (I'm not sure what
> is wrong). They have 6 coefficients instead of the 5 used
> by TpTz, so I assumed that a0 is the output gain to
> compensate for the filter. Is all this reasonable? Also I
> think the a's and b's are reversed between this page and
> TpTz. Is this true?
>
> Thanks.
> -Arthur
>
> On 2/16/07, Victor Lazzarini <vic...@nu...>
> wrote: >
> > I would use a butterworth filter (or two in series for
> > 4th order filter) with a gain object in its output.
> > Would that do?
> >
> > all the best
> >
> > Victor
> > >
> > > I am using the Python binding of the library. It is
> > > quite nice.
> > >
> > > However I cannot find a filter that is suitable for
> > > use as a parametric filter. Is there a class that
> > > provides a variable gain band pass/reject filter? Or
> > > is there an easy way to build one out of other
> > components? >
> > > I'm sorry if this is a stupid question. I feel as if I
> > > should know how to solve this.
> > >
> > > Thanks a lot.
> > > -Arthur
> > >
> > > --
> > > Home page: www.singingwizard.org
> > >
> > >
> > >
> ----------------------------------------------------------
> > > --------------- Take Surveys. Earn Cash. Influence the
> > > Future of IT Join SourceForge.net's Techsay panel and
> > > you'll get the chance to share your opinions on IT &
> > business topics through brief surveys-and earn cash >
> >
>
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> > > _______________________________________________
> > > Sndobj-devel mailing list
> > > Snd...@li...
> > >
> https://lists.sourceforge.net/lists/listinfo/sndobj-devel
> >
>
>
> --
> Home page: www.singingwizard.org
>
> ----------------------------------------------------------
> --------------- Take Surveys. Earn Cash. Influence the
> Future of IT Join SourceForge.net's Techsay panel and
> you'll get the chance to share your opinions on IT &
> business topics through brief surveys-and earn cash
>
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> _______________________________________________
> Sndobj-devel mailing list
> Snd...@li...
> https://lists.sourceforge.net/lists/listinfo/sndobj-devel