zero phase filter in simulink
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I am trying to run a zero phase low pass filter in Simulink in MATLAB however I can't find a zero phase filter block. The function filtfilt() works however when i use a self defined function block in Simulink with the same code that works in MATLAB it doesn't seem to work in Simulink. I have attached an image of the Simulink model and the code itself.![2019-01-24 09_28_13-lowpass_test _ use.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/201329/2019-01-24%2009_28_13-lowpass_test%20_%20use.png)
![2019-01-24 09_28_13-lowpass_test _ use.png](https://www.mathworks.com/matlabcentral/answers/uploaded_files/201329/2019-01-24%2009_28_13-lowpass_test%20_%20use.png)
function y = test_lp(u)
Wn = 0.01*5;
[b,a] = butter( 3, Wn, 'low');
data=u(:,2);
y= filtfilt(b,a,u(:,2));
%y=filtfilt(b,a,u);
end
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Respuestas (2)
Sameer Gadekar
el 11 de Abr. de 2019
Any filter will introduce and has to introduce delay in the output else filter will become instable it wll become non causal.
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Rafael Cordero
el 17 de Jun. de 2020
Im having the same problem. Did you ever figure out how to fix this?
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