Apparatus for preventing video tape duplication

Details Apparatus for preventing video tape duplication Apparatus for preventing video tape duplication

1978-12-26

1980-07-15

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

360 60, 358148, H04N 578

Patent

active

042131499

ABSTRACT:
A video processor is disclosed wherein each vertical sync pulse of a composite video signal is shifted to an intermediate amplitude a predetermined time period after the leading edge thereof, to defeat the synchronizing circuits of video tape recorders operating in the recording mode.

REFERENCES:
patent: 3460161 (1969-08-01), Waller
patent: 3530232 (1970-09-01), Reiter
patent: 3963865 (1976-06-01), Songer
patent: 4030128 (1977-06-01), Perret
patent: 4086634 (1978-04-01), Cook
patent: 4100575 (1978-07-01), Morio
patent: 4121242 (1978-10-01), Janko

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