Biosemi source code needs to include a filter

This forum deals with BCI2000 configuration issues.
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aye
Posts: 4
Joined: 17 Nov 2009, 11:39

Biosemi source code needs to include a filter

Post by aye » 13 Aug 2010, 04:50

Dear all,

I have been working with BCI2000 and Biosemi for a while, and I could not get good/meaningful results.

Support from BCI2000 gave me the clue of what could be the problem. The contibution 'Biosemi source code module' does not include a high pass filter. The tip Gerwin Schalk gave me follows:

The Biosemi uses DC recordings that have a large DC offset that can drift. Without applying a high pass filter, you cannot expect to get good results. Check out the bandpass filter that is included in the MOBIlab source module. If you include this filter in the Biosemi Source module and set it to high pass at 0.01 or 0.1 Hz, this should work.

I did that and now I get good/meaningful results. I hope this helps to other members of this forum!

Regards

aye

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