| 摘要 |
Vertical deflection circuitry for substantially eliminating rolling and bouncing in a video monitor, where for example, the video monitor (260) successively displays images produced by each of one of a pl urality on non-synchronized video cameras (161, 162) and an incoming vertical synchronization (synch) signal (230) to the monito r is merely a composite of the individual vertical synch signals (210, 220) generated by each of these cameras. Specifically, the v ertical deflection circuitry (300) generates the appropriate vertical sweep signal for a current one of these cameras from this c omposite synch signal so as to properly locate the corresponding video image generated by this camera on a display screen of the mo nitor. Inasmuch as the vertical deflection circuitry is re-triggerable (310), then, whenever an out-of-lock condition occurs between a camera and a monitor, this circuitry can establish a vertical lock condition on the next incoming vertical synch pulse in the compo site synch signal rather than requiring numerous vertical frames to occur before vertical synchronization is achieved between tha t camera and monitor.
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