Phase-comparison logic circuit for dual signal television recept

Details Phase-comparison logic circuit for dual signal television recept Phase-comparison logic circuit for dual signal television recept

1977-03-17

1978-04-18

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 504

Patent

active

040854248

ABSTRACT:
A logic circuit providing a bi-level signal, one level of which agrees with eriods of time during which the video signal corresponds to a quadrant of a first broadcast television program, said quadrant being free from horizontal and vertical synchronizing pulses present in the video signal of a second broadcast program.

REFERENCES:
patent: 3082294 (1963-03-01), Dean
patent: 3689694 (1972-09-01), Thorpe
patent: 3943280 (1976-03-01), Kimura et al.

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