BDF/EDF converter

[Gordak]

Hello

I record electrodermal activity with a Biosemi device. I currently read my data from as EDF file previously converted from the bdf file with the converter found on Biosemi website.
http://www.biosemi.com/download.htm

This converter applies a high pass filter on the data in addition to the conversion.
I would like to know what kind of filter is applied. I can access the "raw" data using a simple bdf reader, but I can't figure out which filter is used by the BDF to EDF file converter available on Biosemi website.
So the question is : do you know the type and parameters of the filter applied ? I think it does quite a good job !

Thanks a lot !

[Coen]

A first order high-pass is applied. Cut-off frequency (-3 dB point) and LSB for the (16-bit) EDF file are adjustable for making your own trade-off between bandwidth, resolution, and dynamic range (for GSR data, you probably want a much lower cut-off than the default 0.16 Hz, while an 1 uV LSB is accurate enough).

Best regards, Coen (BioSemi)