[SciPy-User] Very simple IIR filters?

andrew giessel andrew.giessel@gmail....
Mon Oct 29 11:00:16 CDT 2012


This would be great-  I've built some filters (for electrophysiology
and imaging time series) but more directed standard filters would be
very convenient.  Filter design is complex and intimidating to dive
into.  Let me know if I can help

ag

On Oct 29, 2012, at 11:56, 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.
>
> -Travis
>
>>
>>
>> Sturla
>>
>>
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>>
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>
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