Editing Time Domain Filters

The Filter Settings Dialog Box allows you to set the desired filter parameters for each of the sensors. You can invoke it from the main NPXLab menu (Tools | Processors) and then selecting, from the Processors Form, the desired time domain filter to be adjusted (by pressing the Edit ... button). The following form will appear:

You have first to select the sensors to whom filters settings will be edited. You can select a subset of them (e.g. by checking the EEG checkbox all the EEG sensors will be selected), or one by one, selecting them from the right list. Then you can set the filters parameters for all the selected sensors. To do so, you can either select one of the available predefined frequencies by right clicking with the mouse into one of the three edit boxes (High Freq., Low Freq., Notch) or you can type the desired value in it. Note that on some countries decimal points separator are different with respect to the English convention (e.g. in Italy 0.5 is written 0,5 to indicate a half) and depends on local Windows settings. If your local separator does not work, try the English one (the dot).

Note that (this often creates confusion) :

• "High Freq" indicates the cut-off frequency of the Low Pass Filter;
• "Low Freq" indicates the cut-off frequency of the High Pass Filter;
• Notch indicates the powerline AC frequency (50Hz by default in Europe). You can set this into the NPXLab.xml file in your CFG directory (it is a subdirectory of your NPXLab installation directory).

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