Method and apparatus for modifying the color burst to prohibit v

Details Method and apparatus for modifying the color burst to prohibit v Method and apparatus for modifying the color burst to prohibit v

1983-11-14

1986-03-18

Groody, James J.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358319, 358120, 360 371, H04N 945, H04N 980, H04N 7167, H04N 578

Patent

active

045772169

ABSTRACT:
A method and apparatus which modifies a color video signal in such a manner that a conventional television receiver produces a normal color picture from the modified signal, whereas a videotape recording made from the modified signal exhibits annoying color interference. This is achieved by phase modulating the color burst component of the video signal with a noise signal. A videotape recorder interprets the phase variation as a velocity error and alters the chrominance signal, giving rise to color noise in the videotape recording. The characteristics of the noise signal are chosen to preclude interfering with the receiver's subcarrier regenerator.

REFERENCES:
patent: 3723637 (1973-03-01), Fujio et al.
patent: 3963865 (1976-06-01), Songer
patent: 4100575 (1978-07-01), Morio et al.
patent: 4163253 (1979-07-01), Morio et al.
patent: 4213149 (1980-07-01), Janko
patent: 4475129 (1984-10-01), Kagota
patent: 4488183 (1984-12-01), Kinjo

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