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I have filtered out the low frequency noise from the signal. For further analysis, I want to compare it with FIR filters (for which I require cut off frequency). Hence, I took the power density spectrum of noise using Welch method and found its peak and used the same as cut off frequency. The PSD looks like this http://i.stack.imgur.com/OZIXv.jpg.

What would be the cut off frequency? The peak occurs at $0.0031$ Hz or should I take a value between $0-0.5$Hz.

Note: The frequency range of my signal is $0-2$ Hz

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    $\begingroup$ First of all I can't see any high-pass filter... $\endgroup$ – jojek Jul 15 '15 at 8:16
  • $\begingroup$ I can't really see a low-pass filter either. Maybe you just forgot to apply a window (if it's really a low-pass filter)? $\endgroup$ – user13706 Jul 15 '15 at 19:02

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