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