Video signal actuated switch

A video signal actuated switch

• characterized by
• an amplifier circuit (201) for amplifying a particular band of frequencies comprising a known component frequency of a video signal (VS), the amplifier circuit providing an output signal,
• an actuator circuit (202) for providing an output signal responsive to the output signal of the amplifier circuit (201).
• a control circuit (203), responsive to the output signal of the actuator circuit (202), for providing a signal (D) for powering an RF modulator (206), and
• a switch (205), responsive to the control circuit (203), for switching between inputs (G and C) to a video terminal (100).

A video signal actuated switch

• characterized by
• an amplifier circuit (201) for amplifying a particular band of frequencies comprising a known component frequency of a video signal (VS), the amplifier circuit providing an output signal,
• an actuator circuit (202) for providing an output signal responsive to the output signal of the amplifier circuit (201),
• a control circuit (203), responsive to the output signal of the actuator circuit (202), for providing first and second signals (D and E),
• a modulator (206), responsive to the first signal (D) and the video signal (VS), for modulating the video signal (VS) to a particular television channel frequency, and
• a switch (205), responsive to the second signal (E), for switching between two inputs (C and G) to a video terminal (100).

A video signal actuated switch

• characterized by
• an impedance matching circuit (200) for matching the impedance of a video signal (VS), the impedance matching circuit providing an output signal,
• a high impedance amplifier circuit (201) for providing an output signal responsive to the output signal of the impedance matching circuit (200),
• an actuator circuit (202) to providing an output signal responsive to the output signal of the amplifier circuit (201),
• a control circuit (203), responsive to the output signal of the actuator circuit (202), for providing first and second signals (D and E),
• a modulator (206), responsive to the first signal (D) and the video signal (VS), for modulating the video signal to a particular television channel frequency, and
• a switch (205), responsive to the second signal (E), for switching between two inputs (C and G) to a video terminal (100), one input being the output (C) of the modulator (206).

A video signal actuated switch

• characterized by
• an amplifier circuit (201) for amplifying an electrical signal of a known component frequency of a video signal (VS), the amplifier circuit providing an output signal,
• a rectifier (D1) for rectifying the output signal of the amplifier circuit and providing an output signal, and
• means (203, 205) responsive to the output signal of the rectifier (D1), for switching between two inputs (C or G) of a video terminal (100).

A video signal actuated switch

• characterized by
• an amplifier circuit (201) for amplifying an electrical signal of a known component frequency of a video signal (VS), the amplifier circuit providing an output signal,
• an opto-emitter circuit (D5) for providing an actuating signal (F) responsive to the output signal of amplifier circuit (201), and
• a control circuit (203, 205), comprising an opto-responder circuit (Q5), for switching between two inputs (C or G) of a video terminal (100) responsive to the actuating signal (F).