OpenViBE forum

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

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

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.

HI,
I think it depends your algorithm, you can use a band stop filter if your wan't but irt's useless.
Thibaut