What will be the output when a square wave of time period 1sec is applied to the input of LPF of cutoff frequency 1Hz. Please help me, I am not getting the exact expression. What if cutoff of LPF is increased to 4Hz.

  • $\begingroup$ This looks like homework. Go ahead and edit your question to both share the problem as given to you, and to show us the work you've done. $\endgroup$
    – TimWescott
    Aug 25, 2020 at 17:31
  • $\begingroup$ @TimWescott , Sir I found the Fourier series representation of square wave and found only the first harmonic will get pass through the LPF. So the o/p has to be a sine wave but I am not confident. $\endgroup$
    – user32834
    Aug 25, 2020 at 17:43
  • $\begingroup$ So the filter is specifically defined as having $H(f) = 1\ \forall\ |f| \le 1$ and $H(f) = 0\ \forall\ |f| > 1$? $\endgroup$
    – TimWescott
    Aug 25, 2020 at 18:27
  • $\begingroup$ @TimWescott Yes Sir $\endgroup$
    – user32834
    Aug 26, 2020 at 1:14


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