Vertical synchronization pulse
- Vertical synchronization pulse
In television, a vertical synchronization pulse is sent whenever the television set should start scanning a new image from the top of the screen.
The format of such a signal consists in:
* pre-equalizing pulses (6 to start scanning odd lines, 5 to start scanning even lines)
* long-sync pulses (5 pulses)
* post-equalizing pulses (5 to start scanning odd lines, 4 to start scanning even lines)
Each pre- or post- equalizing pulse consists in a short (by half) scan line of black signal: 2µs at 0V, followed by 30µs at 0.3V.
Each long sync pulse consists in an equalizing pulse with timings inverted: 30µs at 0V, followed by 2µs at 0.3V.
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