Synchronization of television vertical deflection system

H - Electricity – 04 – N

Patent

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Details

H04N 5/268 (2006.01) H04N 5/06 (2006.01) H04N 5/12 (2006.01) H04N 7/08 (2006.01)

Patent

CA 2086833

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 plurality on non-synchronized video cameras (161, 162) and an incoming vertical synchronization (synch) signal (230) to the monitor is merely a composite of the individual vertical synch signals (210, 220) generated by each of these cameras. Specifically, the vertical deflection circuitry (300) generates the appropriate vertical sweep signal for a current one of these cameras from this composite synch signal so as to properly locate the corresponding video image generated by this camera on a display screen of the monitor. 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 composite synch signal rather than requiring numerous vertical frames to occur before vertical synchronization is achieved between that camera and monitor.

L'invention est un circuit de déviation vertical qui élimine en grande partie le défilement vertical et l'instabilité verticale sur un moniteur vidéo (260) qui, par exemple, affiche en succession des images produites par une pluralité de caméras vidéo non synchronisées (161,162), le signal de synchronisation vertical (230) transmis au moniteur étant essentiellement une combinaison des signaux de synchronisation verticale individuels (210, 220) produits. € partir de ce signal de synchronisation composite, le circuit de déviation verticale (300) produit le signal de balayage vertical approprié à la caméra du moment pour localiser l'image vidéo produite par cette caméra sur l'écran du moniteur. Dans la mesure où ce circuit peut être redéclenché (310), chaque fois que l'asservissement est perdu entre la caméra et le moniteur, il peut imposer un asservissement vertical à l'impulsion de synchronisation verticale suivante du signal de synchronisation composite sans qu'il soit nécessaire d'attendre le passage de plusieurs trames verticales avant de pouvoir établir la synchronisation verticale entre la caméra et le moniteur.

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