Method and apparatus for disabling anti-copy protection...

H - Electricity – 04 – N

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H04N 7/08 (2006.01) H04N 5/76 (2006.01) H04N 5/913 (2006.01) H04N 7/171 (2006.01)

Patent

CA 2058162

A method and apparatus for disabling the effect of copy-protect signals added to a video signal using differences in the characteristics of television and VCR circuitry. Copy-protect signals as described include pseudo-sync pulses and/or added AGC pulses in the vertical blanking intervals of a video signal. The specific method described includes increasing the effective frequency of the copy-protect signals during the vertical blanking intervals so as to achieve attenuation and/or low-pass filtering in the VCR circuitry to thereby render the signals ineffective in preventing copying. A circuit for achieving this method comprises pulse narrowing and/or pulse multiplication circuitry which effectively increases the high-frequency content of the pseudo-sync and/or AGC pulses.

Méthode et appareil pour invalider l'effet de signaux de protection contre la copie ajoutés à un signal vidéo, en utilisant à cette fin les différences de caractéristiques des circuits de téléviseur et de magnétoscope. Les signaux protégés contre la copie qui sont décrits comprennent des impulsions de pseudo-synchronisation et(ou) des impulsions CAG ajoutées dans les intervalles de suppression verticale d'un signal vidéo. La méthode présentée comprend le relèvement de la fréquence efficace des signaux de protection pendant les intervalles de suppression verticale afin de permettre une atténuation et(ou) un filtrage passe-bas dans les circuits de magnétoscope et de rendre ainsi les signaux impropres à empêcher la copie. Un circuit conforme à cette méthode comprend des circuits de rétrécissement d'impulsions et(ou) de multiplication d'impulsions qui permettent d'accroître le contenu haute fréquence des impulsions de pseudo-synchronisation et(ou) des impulsions CAG.

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