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Definition of "equalizing pulse interval" |
series of 12 sync pulses inserted in the vertical blanking interval of each field of the NTSC composite video signal. The equalizing pulse makes a transition between the composite signal blanking level and the sync level at one-half horizontal line intervals. The duration at the sync level is 3.575 ± 0.425 percent of the horizontal line time (0.45 to 0.5 times the horizontal sync). There are three horizontal lines of equalizing pulses (6 pulses) preceding the vertical synchronization signal and 3 horizontal lines of equalizing pulses (6 pulses) following the vertical synchronization interval. The equalizing pulse interval repeats every field of 262.5 horizontal lines. |
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