| 摘要 |
A television receiver for use with a video signal which is modulated for copy protection forms a continuing signal synchronized with a horizontal synchronising signal comprises a synchronising separator (6) for synchronising separating the horizontal synchronising signal from a video signal. It has a circuit (9,10,11) for detecting that the horizontal synchronising signal is modulated for copy guard, and an automatic frequency controller (AFC) (12) operating according to the signal from the synchronising separator (6) and the signal from the detecting circuit (9,10,11). <IMAGE> |
