- You may effectively implement a non-causal zero phase filter by injecting delay into the input signal.
- Use filtfilt function after filtering. (If you want to implement only in Simulink, you try using filtfilt function within a MATLAB function block)
Filtering without phase shift in Simulink
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Is it possible to filter a signal without a phase shift in Simulink itself ? Please see the below figure. The yellow signal is the unfitered signal and blue signal is the filtered one. To filter the signal I am using a 'Varying Lowpass filter' with order 3 and cut-off frequency as 30 Hz. Also, the moving average filter block is not an option because I need the filtered signal in an array form.
Thank you very much in advance.
Sai Sri Pathuri on 9 Jul 2020
Signal blocks does offer linear phase filtering. There is no block as such for zero-phase filtering in Simulink. You may try the following workarounds.