[Eeglablist] import BDF into EEGLab

[Arnaud Delorme]

Dear Alberto,

you can reference your data after importing it. It is equivalent to specifying a reference in the graphic interface to import the file.
I would not convert BDF format to EDF. BDF format is 24-bit resolution and EDF is 16-bit resolution. You will loose resolution/signal in your data, and these 6 extra bits can be important.
Your data will be identical in the BDF and the EDF file so any filter required on the BDF file will still be required in the EDF file.

Arno

On Nov 11, 2013, at 2:17 AM, Alberto Inuggi <alberto.inuggi at gmail.com> wrote:

> dear Sirs
> 
> concerning the necessity to specify a reference while importing BDF into EEGLAB, do I have to do it exactly when I import it ? or con i reference later ?
> my final aim is to apply a common average reference
> 
> can I do this:
> 
> EEG = pop_biosig(input_file_name, 'importannot','off');
> EEG = pop_reref(EEG, [reference],'keepref','on');
> 
> or i strictly HAVE to do this:
> 
> EEG = pop_biosig(input_file_name, 'importannot','off', 'ref', XX);
> EEG = pop_reref(EEG, [reference],'keepref','on');
> 
> Another question, is it advisable to first convert BDF to EDF with the Biosemi converter this in order to (as written in another list post) "avoid using an aggressive 1hz filter against the BDF offset"
> 
> 
> thanks in advance
> regards
> Alberto
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