Hello,
I wanted to ask something regarding data filtering. I use Unicorn EEG device from g.tec and I am sending the data through LSL to OpenVibe. I send the data out from OpenVibe as OSC message to the network and receive it with another program in order to program sound.
I am trying to do some filtering in between and I managed to add bandpass filter (0.5-30Hz) which works nicely,
but I also want to add 60Hz Notch filter. I don't know how to do this. Shall I take the same temporal filter? I tried this but probably it doesn't make sense:
Could you please help me with this? I want my data to be a little bit more stable because now I feel like there is still too much noise and I can't trust it. All insights of how it could be improved are highly welcomed!
Thank you very much.
Best,
Kamile
filtering EEG data - notch filter
Re: filtering EEG data - notch filter
Hi,
If you have a band pass of 0.5-30, you have only frequency between this 2 values so filter of 60Hz is useless.^^
The noise can come from your setup (maybe electromagnetic, move, not enough gel....)
Thibaut
If you have a band pass of 0.5-30, you have only frequency between this 2 values so filter of 60Hz is useless.^^
The noise can come from your setup (maybe electromagnetic, move, not enough gel....)
Thibaut
Re: filtering EEG data - notch filter
Thank you Thibaut for your answer. However, notch filter is meant to remove the interference of the mains or electrical power supply that leak through everywhere... So I figured that in my country it is 50Hz, 220V. I understand what you say but the makers of the EEG device recommends to use both notch and bandpass filter.
Re: filtering EEG data - notch filter
HI,
I think it depends your algorithm, you can use a band stop filter if your wan't but irt's useless.
Thibaut
I think it depends your algorithm, you can use a band stop filter if your wan't but irt's useless.
Thibaut