first encoder means for binary encoding {HEAD ~ a signal} obtained from {TAIL ~ said first means} with a predetermined voltage level 
obtained from
first encoder means for binary encoding { HEAD ~ a signal } obtained from { TAIL ~ said first means } with a predetermined voltage level
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH