bci2000.org BBS

hi, I'm trying to use BCI2000 whit ModularEEG, i need some support for configuration of two BCI paramethers.

I need the values for gain and offset for BCI2000.

thanks

Alessandro

Hey,

The parameters SourceChOffset and SourceChGain are described on

http://www.bci2000.org/wiki/index.php/U ... taIOFilter

It is necessary to specify them correctly so that the data samples in the data file are correctly scaled in micro Volts. These numbers depend on the hardware used, e.g., on the resolution of the A/D converter (e.g., 16 bits) and on the amplification and input range of the amplifier. I do not know these values for OpenEEG. You can supply a signal of known amplitude (e.g., 100 muV) to the device, see what numbers you get, and figure the scaling/offset out that way.

Gerv