June 2025
Intermediate to advanced
515 pages
17h 5m
English
Content preview from Python For Engineering and Scientific Computing
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6.9 Signal Processing
The signal subpackage provides a variety of signal processing functions such as convolution, B-splines, spectral analysis, filter design, and many others. For more information, I recommend reading the SciPy documentation as I will describe only the Butterworth filter in this section.
6.9.1 Frequency Response of a Butterworth Lowpass
The following function computes the numerator and denominator coefficients of a Butterworth filter:
b,a=butter(N,Wn,btype='low',analog=False,output='ba',fs=None)
The meaning of the individual parameters is described in Table 6.2.
|
Parameter |
Description |
|---|---|
|
N |
Degree of the filter |
|
Wn |
Cutoff frequency (-3 dB for Butterworth filters). For analog filters, Wn is an angular frequency ... |
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