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