means for generating a synchronizing signal part having {TAIL ~ at least a predetermined first number} of {HEAD ~ bits} of a first binary level 
means for generating a synchronizing signal part having { TAIL ~ at least a predetermined first number } of { HEAD ~ bits } of a first binary level
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH