Further, {TAIL ~ a phase difference} between the horizontal synchronizing signal and the video signal is detected so that the phase difference between {HEAD ~ the horizontal synchronizing signal} and the video signal is maintained constant 
Further , { TAIL ~ a phase difference } between the horizontal synchronizing signal and the video signal is detected so that the phase difference between { HEAD ~ the horizontal synchronizing signal } and the video signal is maintained constant
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH