[SciPy-User] Very simple IIR filters?

Ralf Gommers ralf.gommers@gmail....
Mon Oct 29 14:43:24 CDT 2012


On Mon, Oct 29, 2012 at 4:56 PM, Travis Oliphant <travis@continuum.io>wrote:

>
> On Oct 29, 2012, at 8:09 AM, Sturla Molden wrote:
>
> > I have noticed that scipy.signal lacks the simplest class of IIR filters
> > (in fact the one I use most frequently). Specifically:
> >
> > - RC (single-pole)
> > - Notch
> > - Band-pass (inverted notch)
> > - Anti-DC (zero at DC)
> >
> > These are of course very easy to construct and use with sp.signal.filter
> > (and/or filtfilt). But I think it might be beneficial for some users to
> > have them in scipy.
> >
> > Due to their size, they can be make a bit faster by running the loop in
> > Cython instead of using sp.signal.filter (though I've never had use for
> > this optimization).
> >
> > Would this be a useful contribution?
>
> I think so.


+1 for IIR filter code.

How much faster is "a bit"?

Ralf
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