{HEAD ~ second encoder means} for {TAIL ~ binary encoding} an output signal from said second means with a single threshold level proportional to a level of said signal from said first means; and 
for
{ HEAD ~ second encoder means } for { TAIL ~ binary encoding } an output signal from said second means with a single threshold level proportional to a level of said signal from said first means ; and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH