H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/913 (2006.01)
Patent
CA 2489621
A method of synthesizing copy protection signals in a video signal, employing sync and/or pseudo sync pulses followed by respective automatic gain control (AGC) pulses is disclosed. The sync or pseudo sync pulses are provided with the trailing edges thereof generally coincident with the leading edges of respective AGC pulses thereby having essentially small to zero position separation consisting with maintaining copy protection. The position separation between the sync or pseudo sync pulses and the respective AGC pulses is dynamically increased over time so as to reduce or defeat the effects of the copy protection signals. The position separation between the sync or pseudo sync pulses and the respective AGC pulses is dynamically decreased over time to return to the essentially small to zero position separation to maintain copy protection.
La présente invention concerne une méthode permettant de synthétiser des signaux de protection de copie sur un signal vidéo, faisant appel à des impulsions de montage et/ou des pseudo-impulsions de montage, suivies par des impulsions de commande automatique de gain (AGC). Les impulsions de montage, ou les pseudo-impulsions de montage comportent des fronts arrière qui coïncident généralement avec les fronts des impulsions AGC respectives, laissant de la sorte une séparation de position petite à nulle destinée à maintenir une protection de copie. La séparation de position entre les impulsions ou pseudo-impulsions de montage et les impulsions ACG respectives est accrue de manière dynamique dans le temps, de façon à réduire ou à neutraliser les effets des signaux de protection de copie. La séparation de position entre les impulsions ou pseudo-impulsions de montage et les impulsions AGC respectives est réduite de manière dynamique dans le temps afin de rétablir essentiellement une séparation de position petite à nulle afin de maintenir la protection de copie.
Brill Gerow D.
Quan Ronald
Kirby Eades Gale Baker
Macrovision Corporation
Rovi Solutions Corporation
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