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Definition of "horizontal sync pulse" |
a blacker-thanblack signal level contained within the horizontal blanking interval of the composite NTSC signal. The horizontal sync pulse duration is 7.5 ± 0.5 percent of the horizontal line time and an amplitude of 25% of the peak-to-peak video signal. The horizontal sync pulse frequency is 15750 Hz monochrome and 15734 Hz for color NTSC television formats. The NTSC modified the monochrome horizontal frequency slightly to interleave the color subcarrier and to provide an integer relationship of 286 between the horizontal rate and the 4.5 MHz sound carrier. During the equalizing pulse interval, the horizontal sync pulse rate is doubled and the pulse width is halved. Accurate horizontal synchronizing the video display is preserved throughout the NTSC frame by measuring the horizontal line time between the blanking level to the sync level transitions. |
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