[SciPy-User] Signal processing and filtering functions
Wed Mar 9 12:01:51 CST 2011
On Wed, Mar 9, 2011 at 10:33 AM, Joe Kington <firstname.lastname@example.org> wrote:
> The SAE filtering operation performs two-pass, zero phase
> shift, second-order Butterworth filtering.
> You may already be aware of it, but that sounds suspiciously like this
> cookbook example... http://www.scipy.org/Cookbook/FiltFilt
That cookbook code was added to scipy in r4391 and r5195. scipy.signal has
the filtfilt and lfilter_zi function. The basic idea is to apply an IIR
(e.g. Butterworth) filter to the signal twice, first forward and then
There is a lot of room for improvement in that code. I've been working on
rewriting it, and implementing the true Gustafsson algorithm; despite the
comment in the code, lfilter_zi does not implement Gustafsson's method.
Once the change to github is made, I'll start a branch containing this work.
> I'm not sure if that helps any, but I hope it does!
> On Wed, Mar 9, 2011 at 9:53 AM, Nils Wagner <email@example.com>wrote:
>> On Wed, 09 Mar 2011 14:10:43 +0100
>> "Nils Wagner" <firstname.lastname@example.org> wrote:
>> > Hi all,
>> > I am looking for the so-called SAE (Society of
>> > Engineers) Filter functions which are available in
>> > python.
>> > The Abaqus CAE User's manual points to
>> > Has someone implemented those filter functions ?
>> > Any pointer would be appreciated.
>> > Thanks in advance.
>> > Nils
>> I should add the following information
>> The SAE filtering operation performs two-pass, zero phase
>> shift, second-order Butterworth filtering.
>> Is it possible to reproduce such an operation with
>> scipy.signal ?
>> SciPy-User mailing list
> SciPy-User mailing list
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