Can someone please explain how would the image of a biosignal say PPG be affected when a higher-order Butterworth filter is used. Please don't tell about bode curve, I need practical aspects of it. What is the practical implication of a narrow transition band with higher-order filters on a signal?
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$\begingroup$ sorry, what kind of practical aspects do you need? The Bode diagram very clearly illustrates the effects of a filter on the components of your signal, it doesn't get much more practical than that, I'm afraid, but maybe I just don't see what you mean. Could you elaborate? $\endgroup$– Marcus MüllerSep 4, 2020 at 20:11
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$\begingroup$ Hi marcus, I am new to signals . I just wanted to know why I should apply only butter worth order 2 to PPG signals. What is the effect on image ( on signal amplitude and width) if I use order 3 order 4 and so on. What is the effect of a narrower transition band on signals $\endgroup$– curiousSep 5, 2020 at 0:47
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$\begingroup$ the effects are exactly what the Bode diagram says they are – what kind of description of an effect are you hoping for? $\endgroup$– Marcus MüllerSep 5, 2020 at 7:15
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$\begingroup$ Narrow transition band means more temporal ringing (unless the filters are Bessel/Thiran or Gaussian), thus more settling time. $\endgroup$– a concerned citizenSep 5, 2020 at 14:10
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