Re: [Sndobj-devel] Parametric equalizer

[Arthur P. <am...@si...>]

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
> >
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