![]() ![]() That is the code designs a lowpass filter with a cutoff frequency of 150 This following is freqz() function example code that plots the frequency response of the filter used in the above filter() example code. That is, the cutoff frequency of fc/(fs/2)=150/(1000/2)=0.3 is a normalized frequency that refers to the frequency relative to the sampling rate of a digital signal processing system. The butter() function uses normalized frequency. % Design a lowpass filter with cutoff frequency 150 Hz % Generate a noisy signal with a 100 Hz sine wave and random noise Noise, designs a 4th-order lowpass Butterworth filter with a cutoffįrequency of 150 Hz, applies the filter to the signal using the filter function, and plots the original and filtered signals using the plot function. This code below is an example of using filter() function that generates a noisy signal with a 100 Hz sine wave and random
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