Digital processing disruption systems

Details Digital processing disruption systems Digital processing disruption systems

H - Electricity

04

N

H04N 5/775 (2006.01) H04N 5/913 (2006.01) H04N 7/167 (2006.01)

Patent

CA 2569613

A method and apparatus are described for modifying an analogue video signal to impair its conversion to a digital signal by an analogue to digital converter. The resulting modified signal may prevent the operation of the analogue to digital converter altogether, or even if a digital signal can be output and recorded, may result in a signal which is difficult to view due to a reduction in quality on playback. The modifications made to the signal include altering the amplitude of the horizontal synchronization pulses in the original signal, and/or modifying the level of the back porch, or the region of the signal adjacent the back porch. Additionally, methods are contemplated for the use of specific response models for target analogue to digital converters, and display devices.

L'invention concerne un procédé et un dispositif servant à modifier un signal vidéo analogique afin d'empêcher sa conversion en signal numérique par un convertisseur analogique-numérique. Le signal modifié obtenu peut empêcher le fonctionnement du convertisseur analogique-numérique ou peut être un signal, même si un signal numérique peut être sorti et enregistré, difficile à visualiser étant donné la diminution de la qualité à la reproduction. Les modifications apportées à ce signal consistent à changer l'amplitude des impulsions de synchronisation horizontale du signal original et/ou à modifier le niveau de l'arrière-garde ou la zone du signal contiguë à l'arrière-garde. Elle concerne également des procédés servant à utiliser des modèles de réponse spécifiques pour des convertisseurs analogiques-numériques ciblés, ainsi que des dispositifs d'affichage.

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