[SciPy-user] signal.butter questions

Ryan Krauss ryanlists@gmail....
Tue Jun 26 20:10:46 CDT 2007

Thanks for your thoughts Chris.

The idea of an analog filter implemented in software just doesn't make
any sense to me.


On 6/26/07, Christopher Brown <c-b@asu.edu> wrote:
> Hi Ryan,
> RK> I have two questions about signal.butter.  First, I don't see it in
> RK> the docstring, but I am assuming the Wn must be normalized by
> RK> dividing by the Nyquist frequency.  Is that true?  It seems like
> RK> that is what buttord is saying and I assume they use the same
> RK> conventions.
> I am very, very new to scipy (and python), but this is almost certainly
> the case.
> RK> Second, what is meant by the analog keyword?
> This is (must be) to distinguish between digital and analog filters.
> http://www.dspguide.com/ch21/1.htm
> --
> Chris
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