Functionality is available in the Pro edition
If the ECG is recorded with noise and deformations, use filters to correct the graphs.
These filters remove components that frequency is higher than 35 Hz (the Low pass filter 35 Hz button) or 75 Hz (the Low pass filter 35 Hz button). To apply the filter click the corresponding button. To cancel filtering click the corresponding button again. Only one filter can be applied at a time.
To remove power line interference from the ECG signal use the Notch filter. The tool has 2 predefined values (50 Hz and 60 Hz). To select a filter value click on the arrow on the right side of the Notch filter button. The current value is marked with a flag. If you need to set a different value select the Custom... item in the button menu and set up value in the dialog that opens. To use filter with the current value click on the left side of the Notch filter button. To cancel filtering click the button again.
To remove the walks of the baseline of the graph use a High pass filter 1Hz. To apply the filter click the High pass filter 1Hz button. To cancel filtering click the button again.