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