Engineering Q&A
why equalizing pulses are needed. Draw the vertical synchronizing pulse structure.
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Description: To take care of the drawback which occurs on account of the half line discrepancy, five narrow pulses are added on either side of vertical sync pulses. These are known as preequalizing and post-equalizing pulses. The effect of these pulses is to shift the half line discrepancy away both from the beginning and end of vertical sync pulses. Post equalizing pulses are necessary for fast discharge of the capacitor to ensure triggering of the vertical oscillator at proper time.

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The ½ line difference just prior to the start of serrated vertical pulse does not affect the horizontal deflection synchronization but it does affect the vertical synchronization and the interlaced scanning. The effect of uneven line period can be reduced by increasing the interval between the preceding line pulse and the field sync pulses. To ensure that the vertical deflection oscillator receives the necessary triggering voltage at the same time after every field, a series of five narrow pulses 2.3 μs each, occurring at half line rhythm, are inserted before the field sync pulse. These are called pre equalizing pulses. The width of equalizing pulse is normally half the width of horizontal sync pulses, roughly half of 4.7 μs or (2.3 μs). The equalizing pulses inserted after the vertical synchronizing pulses are post equalizing pulses. These equalizing pulses do not disturb the operation of either oscillator, yet they permit the vertical sync pulse to occur at the correct time after every field.


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