detecting {HEAD ~ means} connected to {TAIL ~ said delay} means for detecting phase relations between the sampling clock signal and each of said delayed video signals 
detecting { HEAD ~ means } connected to { TAIL ~ said delay } means for detecting phase relations between the sampling clock signal and each of said delayed video signals
OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH