Method of and apparatus for modifying a video signal to...

Details Method of and apparatus for modifying a video signal to... Method of and apparatus for modifying a video signal to...

H - Electricity

04

N

350/26

H04N 7/16 (2006.01) H04N 5/913 (2006.01)

Patent

CA 1095164

S0891 METHOD OF AND APPARATUS FOR MODIFYING A VIDEO SIGNAL TO PREVENT UNAUTHORIZED RECORDING AND REPRODUCTION THEREOF ABSTRACT OF THE DISCLOSURE A method of and apparatus for modifying a video signal such that a video picture can be reproduced by a video display device in response to the modified video signal, but if the modi- fied video signal is transmitted and then recorded on a video signal recorder, a satisfactory video picture cannot be reproduced if that recorded modified video signal subsequently is played back. A pulse whose amplitude is substantially equal to the peak white level of the video signal is inserted into respective horizontal blanking intervals of the video signal. If this modified video signal is recorded on a conventional type of video signal recorder, the presence of the inserted pulse signal is detected by an auto- matic gain control (AGC) detector which, in turn, controls an AGC amplifier to substantially attenuate the modified video signal which then is recorded.

274475

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