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