[SciPy-user] signal.butter questions

Christopher Brown c-b@asu....
Tue Jun 26 20:05:41 CDT 2007


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


More information about the SciPy-user mailing list