As {HEAD ~ the bit sequence} is detected from {TAIL ~ the read signal} with each, new sample period, it is shifted into a shift register 
is detected from
As { HEAD ~ the bit sequence } is detected from { TAIL ~ the read signal } with each , new sample period , it is shifted into a shift register
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH