We record the EMG signals of dart throwing. Now, we are going to calculate the relative timing of the throws. can I do this?
have you used those filters which rectify the EMG signals? They take abs of each element of the vector (signal) then apply a moving average with a time window of around 0.15-0.2 sec.
No. we didn't use any filter. May I perform the timing filter, offline? How can I do?
whether you can use it offline or not depends on the application. For example if you want to use the EMG to control a robot, you have to use online filters. If you just want to analyze the signal you can analyze it offline!
You can read page 120 of my thesis:
http://www.ics.uci.edu/~mkhademi/files/Publications/2012-10-14-Hossein.Thesis.covered.Researchgate.pdf
I explained my filter in there. Please do not forget to cite my thesis if you use its info.
Rectification and high - pass filtering should be done to get muscle burst activity. You can high - pass filter at 10 or even 60 Hz and then rectify. After that you should get a cleaner and better signal. A fifth order butterworth filter would be the standard.
You could define the timing of the dart throw by looking for the EMG to cross a certain threshold. To keep parameters similar across subjects a relative threshold is advisable.
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