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