I have two questions about signal.butter. First, I don't see it in the docstring, but I am assuming the Wn must be normalized by dividing by the Nyquist frequency. Is that true? It seems like that is what buttord is saying and I assume they use the same conventions. Second, what is meant by the analog keyword? Thanks, Ryan
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
Thanks for your thoughts Chris. The idea of an analog filter implemented in software just doesn't make any sense to me. Ryan 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 _______________________________________________ SciPy-user mailing list SciPy-user@scipy.org http://projects.scipy.org/mailman/listinfo/scipy-user
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