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