Compute the frequency response of a digital filter.
Given the numerator b and denominator a of a digital filter, compute its frequency response:
jw -jw -jmw
jw B(e) b[0] + b[1]e + .... + b[m]e
H(e) = ---- = ------------------------------------
jw -jw -jnw
A(e) a[0] + a[1]e + .... + a[n]e
Parameters : | b : ndarray
a : ndarray
worN : {None, int}, optional
whole : bool, optional
plot : callable
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Returns : | w : ndarray
h : ndarray
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Notes
Using Matplotlib’s “plot” function as the callable for plot produces unexpected results, this plots the real part of the complex transfer function, not the magnitude.
Examples