{HEAD ~ A comparator} receives a threshold value and compares each of {TAIL ~ the intermediate amplitude values} to the threshold value 
{ HEAD ~ A comparator } receives a threshold value and compares each of { TAIL ~ the intermediate amplitude values } to the threshold value
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH