Please use Python to solve this problem. If you do not know, please do not write any comment. Thank you.

Write a python implementation of scipy.signal.freqz. freqz calculates the frequency response (Fourier transform) of an IIR filter (difference equation). Your function should operate the same way as the scipy function (except that you don't need to implement the plot functionality within freqz). You should test against scipy.signal.freqz, but your code cannot call scipy.signal.freqz. Do not copy the source for freqz. In particular, do not use a FFT. Compute the frequency response directly.

The file CA2_freqz.ipynb has more details.

CA2: Implement sig.freqz Write your own version of sig.freqz. Make sure to include a useful documentation string. Make sure your code passes the tests below. [1J: import numpy as np import matplotlib.pyplot as plt import scipy.signal as sig import matplotlib as mpl mp1.rcParams['igure.figsize(5,3) tmatplotlib inline [10: def my_freqz (b, a 1, woxN-None, whole-None) #replace vith your answer pass