[SciPy-user] filter design problem

[Kasper Souren]

Hi,

It's me doing something wrong, or there is a bug in the signal package. My 
scipy_version is 0.2.0_alpha_196.4128.

I'm trying to create a Butterworth bandpass filter, but somehow the resulting 
filter is always lowpass. I.e. the plot of the freqz is always 1 at the 0 
frequency.

Here is some code:

from scipy.signal import buttord, butter, freqz

n,Wn=buttord([0.4, 0.6], [0.2, 0.7], 3, 45)
b,a=butter(n,Wn)
gplt.plot(abs(freqz(b,a,1000)[1]))


bye,
Kasper

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