Sample/hold circuit 171 captures the analog data for {HEAD ~ processing} by {TAIL ~ filter} 50 
by
Sample / hold circuit 171 captures the analog data for { HEAD ~ processing } by { TAIL ~ filter } 50
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH