1. With the bilinear transformation to design a Butterworth low-pass IIR digital filter. Design target parameters: the passband frequencies below 0.2π, the maximum attenuation is less than 1dB in the stopband [0.3π, π] frequency range, the minimum attenuation greater than 15dB. 2.0.02π for the sampling interval, print out the digital filter in the frequency interval [0, π/2] on the frequency response curve. 3. With the designed filter on the actual ECG signal sample sequence to simulate filtering, observation summed up the role and effect of filtering Attachment: ECG sampling sequence x (n) Human ECG signal in the measurement process is often subject to industrial high-frequency interference, it must be low-pass filtering before they can determine cardiac function as a useful information. Here are a sample of the actual ECG signal sampling sequence x (n), where there is high frequency noise. In the experiment with x (n) as the input sequence, in which the interference filter e

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