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