The circuit 21, wherein {HEAD ~ the third stage} compares the one eighth, one fourth, three eighths, one half, five eighths, {TAIL ~ three fourths}, and seven eighths amplitude values to the threshold amplitude value and generates the time of arrival adjustment value based on the comparisons 
compares
The circuit 21 , wherein { HEAD ~ the third stage } compares the one eighth , one fourth , three eighths , one half , five eighths , { TAIL ~ three fourths } , and seven eighths amplitude values to the threshold amplitude value and generates the time of arrival adjustment value based on the comparisons
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH