Python scipy.signal IIR Filter Design Cont.
In the previous post the Python scipy.signal iirdesign function was disected. We reviewed the basics of filter specification and reviewed how to use the iirdesign function to design IIR filters. The previous post I only demonstrated low pass filter designs. The following are examples how to use the iirdesign function for highpass, bandpass, and stopband filters designs.
Highpass Filter
The following is a highpass filter design for the different filter types. Refer to the previous post for information on the iirdesign function arguements and usage.
Again, similiar to the approach in the previous post tighter specifications can be given for the ellip and cheyb2 filter design.
Bandpass Filter
As mentioned, a bandpass filter coefficients can be created with the iirdesign function as well. Since the iirdesign function is similiar for the different filter types we will only use the ellip and cheby2 for the rest of the examples.
Stopband Filter
And lastely here is an example to create a stopband filter.
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w,H = signal.freqz(b,a) and plot(w, angle(H)) doesn't make sense there. How do you compute it?
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