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NOCIONS / letswave7

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Notch Filter #8

Open mvct opened 4 years ago

mvct commented 4 years ago

Dear all, I tried to applied a 50 Hz Notch filter on my data using letswave UI. However, the parameters to fill seems wrong: it ask for low and high cut off frequencies. The Notch filter should only have one. And if I set both parameters at the same frequency , the signal filtering is wrong. The output is an oscillatory damped waveform.

I was wondering if it was a bug or if the function works without using the interface, but using the code direclty?

Thanks!

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hughherald commented 3 years ago

Dear mvct, In fact, the notch filter is designed as a bandstop filter, which is reversed of bandpass. For 50Hz Notch filter, maybe you can try 49Hz low cut off frequency and 51Hz high cut off frequency.

Best, Gan Huang