The sync pattern selecting unit {HEAD ~ 33 d} may includes a multiplexer and uses a signal from {TAIL ~ the snap shot} determining Unit 33 b as a selection signal 
The sync pattern selecting unit { HEAD ~ 33 d } may includes a multiplexer and uses a signal from { TAIL ~ the snap shot } determining Unit 33 b as a selection signal
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH