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US 4,070,695 AGranted
Circuit for simultaneous display of separately broadcast video signals
AssigneeSaba Schwarzwaelder Apparate-Bau-Anstalt August Schwer Soehne GmbH
InventorsArtur Scholz, Dennis Cota
Life of this patent
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Abstract
A circuit system for a television receiver, said system operating to repl a changing quadrant of the picture of a main transmitted program with an equivalent-size sector of a second transmitted program.
Claims8
A circuit system for a television receiver wherein a quadrant of a first transmitted video signal is replaced by a sector of a second transmitted video signal comprising:
- means for receiving, separating and amplifying at intermediate frequencies a first and a second transmitted video signal;
- sync-separating means for separately extracting the vertical and the horizontal synchronizing pulses from said first and second transmitted video signals;
- phase-comparison means for processing said vertical and horizontal pulses to provide a bi-level switching signal in which a second level is activated only during time periods corresponding to transmission of a quadrant of said second transmitted video signal, said time periods coinciding with time periods during which no synchronous pulses occur during transmission of said first transmitted video signal;
- video display means;
- and
- switching means responsive to said bi-level switching signal, said switching means linking said second transmitted video signal to said video display means during activation by said second level of said switching signal and linking said first transmitted video signal to said video display means during activation by the first level of said switching signal.
3 more elements
Dependencies are inferred from the claim text.