EEG filtering in neurofeedback.py via utils.py

alexandrebarachant / muse-lsl

Python script to stream EEG data from the muse 2016 headset

BSD 3-Clause "New" or "Revised" License

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Closed sunshineinsandiego closed 3 years ago

sunshineinsandiego commented 3 years ago

Hi - Thanks for the helpful neurofeedback code, wondering if you could answer a quick question about the implementation:

In line 22 of utils.py:

NOTCH_B, NOTCH_A = butter(4, np.array([55, 65]) / (256 / 2), btype='bandstop')

Assuming this filter out all frequencies between 55Hz and 65Hz? I.e. rejects all between 55-65Hz
Any particular reason these frequencies were chosen?

Thanks!

oori commented 3 years ago

AC line frequency in the US (60Hz).

sunshineinsandiego commented 3 years ago

Got it thanks!