Filtering EMG Data using Dataquest ART – Data Sciences International

The bottom most signal is the EMG signal
The next one up is the EMG filter with a High Pass filter at 50-75 Hz. To do this:
1. Select the EMG signal
2. Right-click and select Filter Actions - High Pass
3. Enter a Low end cutoff of 50-75 Hz
4. Click OK
5. A new data series will be added to the top of your Analysis window labeled Animal ID.EMG.Highpass
The 3^rd graph from the bottom is that high pass filtered data Half Wave Rectified. To do this:
1. Select the filtered EMG signal from step two above (series name Animal ID.EMG.Highpass)
2. Right-click and select General Actions - Half Wave Rectification
3. A new data series will be added to the top of your Analysis window labeled Animal ID.EMG.Highpass.HWRectification
The top graph is the Half Wave Rectified signal from step 3 filtered with a low pass filter
1. Select the signal generated in step 3 above (series name Animal ID.EMG.Highpass.HWRectification)
2. Right-click and select Filter Actions - Low Pass
3. Enter a High end cutoff of 3 Hz
4. Click OK
5. A new data series will be added to the top of your Analysis window labeled Animal ID.EMG.Highpass.HWRectification.Lowpass
Next you can graph all of these together on one graph, as shown in the manual by:
1. Hold the control key down on the keyboard and select all four series generated in the above steps, to highlight the four data series
2. Right-click and select Display Actions - Plot
3. Choose to Plot by Series Order
4. Click OK