Horizontal Sync The -40 IRE (NTSC) or the
Horizontal Sync – The -40 IRE (NTSC) or the –300 mV (PAL) pulse occurring at the beginning of each line. This pulse signals the picture monitor to go back to the left side of the screen and trace another horizontal line of picture information. The portion of the video signal that occurs between the end of one line of signal and the beginning of the next. A negative going pulse from the blanking signal used to genlock (synchronize) equipment. It begins at the end of front porch and ends at the beginning of back porch.
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