Method and apparatus for preventing the copying of a video progr

Details Method and apparatus for preventing the copying of a video progr Method and apparatus for preventing the copying of a video progr

1988-11-01

1990-03-06

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358319, 360 371, 380 5, 380 10, 380 15, H04N 576

Patent

active

049070932

ABSTRACT:
A video signal is modified so that a television receiver will still provide a normal color picture but which a video tape recorder will detect and prohibit its being recorded. A plurality of ordered pairs of pseudo-sync and positive pulses are added to the video signal vertical blanking interval following the normal sync pulse. A disabiling circuit associated with a recorder detects the modified signal. This detection may be by comparing the voltage differential between the pseudo-sync pulse tip and the positive pulse relative to the normal voltage differential between the sync pulse tip and the back porch of the blanking interval. Alternatively, the modified signal can be detected by identifying the pulse frequency of the signal in the blanking interval. A high frequency is indicative of the presence of the modified signal. Detection is also shown by peak-detecting the video signal and sampling this peak-detected signal during the vertical blanking period. A control signal is produced, when the modified signal is present, which disables the recording device. If no modified signal is detected, the recording device is enabled.

REFERENCES:
patent: 4475129 (1984-10-01), Kagota
patent: 4488183 (1984-12-01), Kinjo

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