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US 4,361,854 AGranted
Video switch for a VTR-compatible television receiver
AssigneeNorth American Philips Consumer Electronics Corp.
InventorPaul G. Wolfe
Life of this patent
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Abstract
A circuit for coupling the demodulated composite video signal to a Video Tape Recorder and for selectively coupling either that signal or a signal from an alternate source to the receivers video processing circuitry. The circuit includes diodes having inputs separately connected to the set of video signal sources and outputs coupled in common to a control circuit that determines which signal is coupled to the output and which is isolated from it.
Claims3
A video switch for selecting between alternate sources of video signals comprising:
- a primary source of video signals;
- an alternate source of video signals;
- diode means having a first diode and a second diode, each of said diodes having a cathode and an anode;
- the cathode of said first diode being connected to the anode of said second diode and providing an output;
- one of said sources of video signals being coupled to the anode of said first diode;
- the other of said video sources being coupled to the cathode of said second diode;
- and
- bias control means connected to said diode means to selectively bias said diodes so that video signals from the selected source will appear at said output.
5 more elements
Dependencies are inferred from the claim text.