{HEAD ~ The frequency} of {TAIL ~ the back EMF signal} is determined from the zero crossings of the EMF signal 
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{ HEAD ~ The frequency } of { TAIL ~ the back EMF signal } is determined from the zero crossings of the EMF signal
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH