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