Method and apparatus for providing a clock signal with high...

H - Electricity – 04 – N

Patent

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Details

H04N 5/445 (2006.01) G09G 5/18 (2006.01) H03L 7/14 (2006.01) H04N 5/12 (2006.01)

Patent

CA 2391735

A circuit for providing a sufficiently accurate clock signal for reconstruction of an image from a video signal can function with or without receiving an incoming video signal containing clock data. In this way, a clock signal for supporting an on-screen display can be created in the absence of an incoming video signal. Control data used to control a voltage controlled oscillator generating a clock signal is recorded when the control logic of the oscillator is locked to the timing data in an incoming video signal. In the absence of an incoming video signal, the recorded control data is retrieved and resubmitted to the control logic so that the oscillator can be made to output an appropriate clock signal even in the absence of an input video signal.

L'invention concerne un circuit destiné à générer un signal d'horloge suffisamment précis pour reconstruire une image à partir d'un signal vidéo. Le circuit peut fonctionner avec réception ou sans réception d'un signal vidéo entrant contenant des données d'horloge. Un signal d'horloge correspondant à un affichage sur écran peut ainsi être créé en l'absence d'un signal vidéo entrant. Des données de commande, utilisées pour commander un oscillateur commandé par tension générant un signal d'horloge, sont enregistrées lorsque la logique de commande de l'oscillateur est asservie aux données temporelles d'un signal vidéo entrant. En l'absence d'un signal vidéo entrant, les données de commande enregistrées sont récupérées et soumises à nouveau à la logique de commande, de manière que l'oscillateur puisse générer un signal d'horloge approprié en l'absence d'un signal vidéo entrant.

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