Filtering 50Hz frequency

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M G
M G le 7 Mar 2011
Hi there,
Please could you give me a hint how I can eliminate the 50Hz frequency (electricity noise) from my eeg signals?
By FT? If so, how?
I appreciate your help.

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Walter Roberson
Walter Roberson le 7 Mar 2011
fft would be one method: fft the signal, find the bin that corresponds to 50 Hz, zero that entry (and its mirror) and ifft() back.
More commonly you would use a band-stop filter.

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