python-scipyHow do I use the Scipy freqz function in Python?
The scipy.signal.freqz
function in Python is used to compute the frequency response of a digital filter. This function takes two arguments: a numerator and denominator polynomial coefficients of a digital filter.
Example code
from scipy.signal import freqz
b = [1, -2, 0.5]
a = [1, 0, 0.3]
w, h = freqz(b, a)
The output of the above code is two arrays w
and h
which contain the frequency and corresponding complex frequency response of the filter, respectively.
Code explanation
from scipy.signal import freqz
- imports thefreqz
function from thescipy.signal
moduleb = [1, -2, 0.5]
- defines the numerator polynomial coefficients of the filtera = [1, 0, 0.3]
- defines the denominator polynomial coefficients of the filterw, h = freqz(b, a)
- computes the frequency response of the filter using thefreqz
function
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