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