| 摘要 |
An apparatus for providing video signal synchronized operation between two or more video signal originating devices, such as video color cameras, one operating as a master, and the other one or more video cameras or devices operating as slaves or masters, is described. The apparatus takes the latch output of the master camera channel and derives a positive-going ramp one horizontal line long. The slave latch output is also caused to form a sample pulse. The master ramp and slave sample pulse are compared and the resultant positive correction voltage is applied to the voltage controlled oscillator of the slave. The apparatus develops positive error pulses if the master and slave video signals are not synchronized. The error pulses are combined with the slave composite sync, resulting in a series of sharp, negative-going, oscillator shut-off pulses for slowing down the slave sync generator until the master catches up with the slave, the pulses being turned off when the master and slave cameras are in synchronization.
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