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