Video switch circuit
AssigneeGTE Products Corporation
InventorJohn D. Lovely
Life of this patent
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Abstract
A circuit for selecting one of a number of video signals to be processed by a television receiver. The circuit comprises diode means having inputs suitable for coupling to alternate sources of video signals. A bias source applies a bias voltage to the diode means and control means applies various control voltages to the diode means. The relationship of the control voltages to the bias voltage determines which of the alternate sources of video signals are coupled to the output of the diode means.
Claims16
A video switch comprising diode means having a first and a second input coupled respectively to a first and a second source of signals, and an output, said diode means including a first diode having an anode coupled to said first input and a second diode having a cathode coupled to said second input, the cathode of said first diode and the anode of said second diode being coupled in common to said output;
- a bias source coupled to the output of said diode means for applying a bias voltage to the output thereof;
- and control means coupled to the first and second inputs of said diode means for selectively applying respective first and second control signals thereto for determining, in conjunction with said bias source, which of said signal sources is coupled to the output of said diode means.
A video switch comprising:
- a first diode having an anode to be coupled to a first source of video signals;
- a second diode having cathode to be coupled to a second source of video signals;
- a bias source coupled to the cathode of the first diode and the anode of the second diode for applying a bias voltage thereat;
- a control switch having at least a first pole and first and second terminals associated therewith, the first pole being coupled to both the anode of the first diode and the cathode of the second diode, the first terminal being connected to a first control voltage and the second terminal being connected to a second control voltage.
Dependencies are inferred from the claim text.