Method and apparatus for modifying a video signal to inhibit una

Details Method and apparatus for modifying a video signal to inhibit una Method and apparatus for modifying a video signal to inhibit una

1991-06-21

1993-10-05

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358335, 360 371, 380 5, H04N 578, H04N 979

Patent

active

052510417

ABSTRACT:
A method and an apparatus which modifies a video signal such that a conventional video monitor reproduces a normal picture from the modified video signal, whereas a videotape recording of the modified video signal and subsequent playback thereof produces disturbances in the displayed picture. Predetermined portions of the video signal are identified and copy protection signals are added thereto. The signal mixing and delaying characteristics of a videotape recorder comb filter are exploited to modify, produce and relocate synchronization and burst interfering copy protection signals added to an original videotape recording.

REFERENCES:
patent: 4163253 (1979-07-01), Morio et al.
patent: 4488183 (1984-12-01), Kinjo
patent: 4571642 (1986-02-01), Hofstein
patent: 4577216 (1986-03-01), Ryan
patent: 4737862 (1988-04-01), Koga
patent: 4819098 (1989-04-01), Ryan

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