Hello,
I'm currently trying to figure out whether it is possible to smooth an EMG-signal in an analog circuit.
My problem is that I would like to turn on a vibrator, if the EMG reaches a certain amplitude and turn off, once the muscle reflexes via use of a comparator - of course happening in real time.
Due to EMG's nature, a raw signal looks like:
http://www.biomed.drexel.edu/labs/biomechanics/images/emg_fig3.gif
My theory is that the vibrator would constantly turn on and off, thus giving discomfort to the user. Firstly, my plan is to rectify the signal to make all values positive. After this, I would like some sort of smoothing. Digitally, root mean square would be ideal for my purpose (see image below), however, I am pretty lost when it comes to implementing a method similar to this in an analog circuit.
http://www.jjengineering.com/Images/Screenshots/emgraw-1WebSmall.jpg
I have been recommended a low pass filter to filtrate some of the highest frequency, however this won't change the oscillative nature of an EMG signal. Is there anything I can do to lessen this? Must be in an analog circuit.
Thank you!
I'm currently trying to figure out whether it is possible to smooth an EMG-signal in an analog circuit.
My problem is that I would like to turn on a vibrator, if the EMG reaches a certain amplitude and turn off, once the muscle reflexes via use of a comparator - of course happening in real time.
Due to EMG's nature, a raw signal looks like:
http://www.biomed.drexel.edu/labs/biomechanics/images/emg_fig3.gif
My theory is that the vibrator would constantly turn on and off, thus giving discomfort to the user. Firstly, my plan is to rectify the signal to make all values positive. After this, I would like some sort of smoothing. Digitally, root mean square would be ideal for my purpose (see image below), however, I am pretty lost when it comes to implementing a method similar to this in an analog circuit.
http://www.jjengineering.com/Images/Screenshots/emgraw-1WebSmall.jpg
I have been recommended a low pass filter to filtrate some of the highest frequency, however this won't change the oscillative nature of an EMG signal. Is there anything I can do to lessen this? Must be in an analog circuit.
Thank you!