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I'm designing a low pass filter to identify the DC content of a signal. The most important aspects of my application are the accuracy and the speed of the identification.

I would like to know if the phase lag brought by the filter plays an important role in my problem, because I have developped a filter that has a great performance in time (it identifies the DC component very fast and accurately), but its frequency response is poor in terms of phase. Do I really need to worry about it in this situation?

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    $\begingroup$ "I'm designing a low pass filter to identify the DC content of a signal." .... "but its frequency response is poor in terms of phase." --- why would the frequency response at any frequencies other than those close to DC be of any salience? $\endgroup$ Aug 30, 2019 at 7:04
  • $\begingroup$ Right. So if my filter has a cut-off frequency of 10 Hz (the AC part of the signal has very high frequency), there is no problem in having a phase of -128° at this frequency? $\endgroup$ Aug 30, 2019 at 7:24
  • $\begingroup$ @ViníciusLopesSimões how are we supposed to know that? Do you care about the signal at 10 Hz? $\endgroup$ Aug 30, 2019 at 7:53
  • $\begingroup$ Not at all! Thank you! $\endgroup$ Aug 30, 2019 at 8:00

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