How to filter out peaks in a signal in Simulink?
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Darshan Reddy
le 23 Août 2018
Commenté : Darshan Reddy
le 28 Août 2018
I want to filter out peaks in signals in Simulink without causing a delay in a signal. I have tried median filters but I need a large sliding window value (20+) to filter out peaks, doing so will introduce a large delay in the output signal which is undesirable. Is there another way to effectively filter out peaks without causing a significant delay in the output ?
Here is an example image of how a signal looks like.The peaks here are at 15s-16s mark.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/194309/image.png)
Any help would be greatly appreciated. Thanks in advance!
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Naman Chaturvedi
le 27 Août 2018
Hello Darshan,
You cannot filter the signal without some delay. You can choose the low pass filter appropriate for your purpose with some delay. It is not possible to perform a zero-phase filter in real-time because a zero-phase filter requires filter coefficients that are symmetric around zero. That means that the filter is non-causal, or that current output depends on future input. This of course is not possible in the real-time case (simulink) and can be faked as in the case of filtfilt in MATLAB during post-processing.
You can even post process the signal by Compensate for the Delay Introduced by an FIR Filter or passing the signal again through a conjugate of the filter used in the simulink in the first place.
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