Why the Butterworth filter is not working

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Matheus Brito
Matheus Brito 2021-1-31
评论： Star Strider 2021-1-31
I have the following code that I use to filter my data:
I have the following code that I use to filter my data:
freq1 = 60; % frequency of acquisition
n = 4; % filter order
freq_cut = 4; % cutoff frequency
Wn = freq_cut / (freq1 / 2);
[b, a] = butter (n, Wn); % defining Butterworth filter type
% Filtering data using FILTFILT
SMap = filtfilt (b, a, SAP);
But, for some reason, I can't use it in the 2019 version of matlab, and the following message appears:
Error using Untitled (line 60)
'butter' requires one of the following:
DSP System Toolbox
Signal Processing Toolbox
What can I do?
Thanks!
  1 个评论
Star Strider
Star Strider 2021-1-31
‘What can I do?’
License, download and install one of those Toolboxes. (My preference would be the Signal Processing Toolbox, however I do not know what you are doing, or which would be more appropriate in your situation.)

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