Distorted time domain signal for high pass butterworth filter designed using 'butter' command and filtered using 'filter' command
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MathWorks Support Team
on 31 Mar 2014
Answered: MathWorks Support Team
on 31 Mar 2014
Why does the filtered samples of my high pass filter (12th order) look distorted in the time domain when I use the 'filter' command? The filter is designed with the butter command with a very low cut-off frequency of 0.65Hz. The frequency of the signal is 25Hz.
Accepted Answer
MathWorks Support Team
on 31 Mar 2014
The butter worth filter has non-zero phase distortion characteristics which is observed in the time domain. A workaround to obtain signals with zero-distortions would be to use the 'filtfilt' command instead. Please find the attached script which shows an example comparision between the two.
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