The H countdown circuit 14 counts {TAIL ~ clocks} of {HEAD ~ the internal clock}, and generates an H reset signal which is a pulse indicating one horizontal period 
The H countdown circuit 14 counts { TAIL ~ clocks } of { HEAD ~ the internal clock } , and generates an H reset signal which is a pulse indicating one horizontal period
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH