Method of and apparatus for modifying a video signal to prevent

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

1977-03-22

1979-07-31

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 33, 360 37, H04N 716

Patent

active

041632532

ABSTRACT:
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 modified 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 automatic gain control (AGC) detector which, in turn, controls an AGC amplifier to substantially attenuate the modified video signal which then is recorded.

REFERENCES:
patent: 2909597 (1959-10-01), Johnson
patent: 3081376 (1963-03-01), Loughlin et al.
patent: 3439113 (1969-04-01), Walker
patent: 3446914 (1969-05-01), Hodge
patent: 3532808 (1970-10-01), Fujisawa
patent: 3824332 (1974-07-01), Horowitz
patent: 3963865 (1976-06-01), Songer

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