Method and apparatus for modifying the color burst to prohibit videotape recording
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United States of America Patent
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-
Mar 18, 1986
Grant Date -
N/A
app pub date -
Nov 14, 1983
filing date -
Nov 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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