{HEAD ~ The occurrence} of {TAIL ~ the pulses} are compared digitally resulting in an analog control signal for the adjustment of the work piece drive 
{ HEAD ~ The occurrence } of { TAIL ~ the pulses } are compared digitally resulting in an analog control signal for the adjustment of the work piece drive
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH