EEG offset Emotiv Epoc
Posted: Mon Nov 18, 2019 11:09 pm
Hello.
I have the BMI Emotiv Epoc in Research version. I am starting with the capture of raw EEG signals.
The first version of the design was:
- the acquisition box and
- then the writing box in .csv.
The .csv file contained data, but it caught my attention that they were only positive values.
I contacted the support of emotiv and they replied that I should eliminate the background noise. I was recommended to apply a high pass filter to the data, then there will be positive and negative values centered at zero.
In case anyone is interested, they recommended the following link: https://emotiv.gitbook.io/emotivpro-v2- ... /dc-offset.
After reading that information, I am trying to make the design of the second version, which contains:
- an acquisition box,
- a temporal filter box
- filter method: Butterworth
- filter type: High Pass
- filter order: 1
- low and high cut frequency: when selecting the filter type,
autocompleted with 1 and 40 hz respectively.
- band pass db: 0,5 (default)
- writing box in .csv
I finally got positive and negative values!
But my question arises, if anyone has experience with Emotiv Epoc and OpenVibe, to see if I am really using the correct boxes and the necessary steps to obtain real EEG data (preprocessing). Or if they recommend some extra step to improve data information.
Thank you!.
I have the BMI Emotiv Epoc in Research version. I am starting with the capture of raw EEG signals.
The first version of the design was:
- the acquisition box and
- then the writing box in .csv.
The .csv file contained data, but it caught my attention that they were only positive values.
I contacted the support of emotiv and they replied that I should eliminate the background noise. I was recommended to apply a high pass filter to the data, then there will be positive and negative values centered at zero.
In case anyone is interested, they recommended the following link: https://emotiv.gitbook.io/emotivpro-v2- ... /dc-offset.
After reading that information, I am trying to make the design of the second version, which contains:
- an acquisition box,
- a temporal filter box
- filter method: Butterworth
- filter type: High Pass
- filter order: 1
- low and high cut frequency: when selecting the filter type,
autocompleted with 1 and 40 hz respectively.
- band pass db: 0,5 (default)
- writing box in .csv
I finally got positive and negative values!
But my question arises, if anyone has experience with Emotiv Epoc and OpenVibe, to see if I am really using the correct boxes and the necessary steps to obtain real EEG data (preprocessing). Or if they recommend some extra step to improve data information.
Thank you!.