Implementation of Butterworth filter in MATLAB
The Butterworth filter is a common analog and digital filter that has a flat amplitude-frequency response curve and minimal phase distortion. In MATLAB, you can use butterfunctions to design and apply Butterworth filters.
Design Butterworth filter
In MATLAB, you can use butterfunctions to design Butterworth filters. The syntax of the function is as follows:
[b, a] = butter(n, Wn, 'ftype')
Among them, nis the order of the filter, Wnis the normalized cutoff frequency, ftypeand is the type of filter.
The order of the filter ( n) determines the steepness of the filter. Higher orders provide a steeper roll-off, but also introduce more phase distortion. Generally speaking, the higher the order, the better the performance of the filter, but the calculation