Logic control for video processing in program switchers

Claim 2

An arrangement for controlling the relative amplitudes of first, second, third and fourth video signals VA, VB, VC, VD comprising a source of first, second and third unidirectional control signals VR - EAB, EAB, VR - ECD, ECD wherein EAB and ECD are independently adjustable between a lower and an upper amplitude limit VR, means for modifying the amplitude of said VR - EAB and said EAB control signal as a function of ECD, F(ECD), to provide a (VR EAB) X F(ECD) and a (EAB) X F(ECD) modified control signal, a first, second, third and forth amplifier each responsive to a respective video signal and a respective one of said ECD, VR ECD, (EAB) X F(ECD), and (VR - EAB) X F(ECD) control signals for modifying the amplitude of its respective video signal in accordance with the amplitude of its respective control signal over the range of adjustments of said EAB and ECD signals.

Claim 3

An arrangement according to claim 1 wherein F(ECD) VR -ECD/VR and said one of said amplifiers associated with the (VR -ECD) control signal is rendered inoperative.

Claim 4

An arrangement according to claim 1 wherein F(ECD) (ECD/VR) and said one of said amplifiers associated with the (ECD/VR) control signal is rendered inoperative.

Claim 5

An arrangement according to claim 1 comprising means for causing selected signals among ECD, (VR - ECD), (EAB) X F(ECD) and (VR - EAB) X F(ECD) to be equal to VR.

Claim 6

An arrangement according to claim 1 wherein said means for modifying said (VR -EAB) and said EAB control signals comprises, a respective multiplier for multiplying said (VR - EAB) and EAB signals by said (VR - ECD) or said ECD signals to provide first and second remainder signals, and a divider for dividing said remainder signals by the value of VR to provide said (EAB) X F(ECD) and (VR - EAB) X F(ECD) signals.

Claim 7

An arrangement for combining any selected three of four available output signals on an amplitude-sharing basis using a respective parallel connected amplifier for each output signal comprising means for providing four unidirectional control signals VR -EAB, EAB, VR - ECD, ECD wherein EAB and ECD are independently adjustable between a lower and an upper amplitude limit VR, means for modifying the amplitudes of said VR - EAB and said EAB control signal as a function of ECD to provide respective modified control signals, each of the amplifiers corresponding to the selected output signals being responsive to a respective one of said ECD, VR -ECD, modified EAB and modified VR - EAB control signals for modifying the amplitude of its respective output signal while maintaining the total amplitude of the selected output signals constant over the range of adjustments of said EAB and ECD signals.

Claim 8

An arrangement for combining any selected three of four available output signals on an amplitude-sharing basis using a respective parallel connected amplifier for each output signal comprising means for providing four unidirectional control signals VR -EAB, EAB, VR - ECD, ECD wherein EAB and ECD are independently adjustable between a lower and an upper amplitude limit VR, means for modifying the amplitudes of said VR - EAB and said EAB control signal as a function of ECD to provide respective modified control signals, each of the amplifiers corresponding to the selected output signals being responsive to a respective one of said ECD, VR -ECD, modified EAB and modified VR - EAB control signals for modifying the amplitude of its respective output signal while maintaining the total amplitude of the selected output signals constant over the range of adjustments of said EAB and ECD signals.

Claim 9

A signal processing arrangement for producing two output signals in response to one input signal under the control of a digital command source comprising means responsive to said digital command source being operated to one logic state for producing a first output signal equal to the difference between a reference signal and said input signal, and responsive to said digital command source being operated to its other logic state for producing a first output voltage equal to said reference signal, means responsive to said digital command source being operated to one to produce a second output voltage equal to said input voltage and responsive to said digital command source being operated to its other state to produce a second output voltage equal to said reference voltage.

Claim 10

A signal processing arrangement for producing two output signals in response to one input signal under the control of a digital command source comprising means responsive to said digital command source being operated to one logic state for producing a first output signal equal to the difference between a reference signal and said input signal, and responsive to said digital command source being operated to its other logic state for producing a first output voltage equal to said reference signal, means responsive to said digital command source being operated to one to produce a second output voltage equal to said input voltage and responsive to said digital command source being operated to its other state to produce a second output voltage equal to said reference voltage.

Claim 11

A signal processing arrangement comprising a reference amplitude signal source, a source of a first amplitude signal adjustable between zero and said reference amplitude, a source of a second amplitude signal adjustable between zero and said reference amplitude, mechanical means movable along a single path for adjusting the amplitudes of said first and second voltages, producing means responsive to applied signals for producing output signals, means to subtract said first signal from said reference signal to give a first remainder, means to subtract the second signal from said reference signal to give a second remainder, a source of four binary switching signals, means responsive to a first combination of said switching signals to simultaneously apply said first signal, said first remainder and said second remainder to said producing means to produce a first output signal, means responsive to a second combination of said switching signals to simultaneously apply said second signal, said second remainder and said second signal to said producing means to produce a second output signal.

Claim 12

A signal processing arrangement comprising a reference amplitude signal source, a source of a first amplitude signal adjustable between zero and said reference amplitude, a source of a second amplitude signal adjustable between zero and said reference amplitude, mechanical means movable along a single path for adjusting the amplitudes of said first and second voltages, producing means responsive to applied signals for producing output signals, means to subtract said first signal from said reference signal to give a first remainder, means to subtract the second signal from said reference signal to give a second remainder, a source of four binary switching signals, means responsive to a first combination of said switching signals to simultaneously apply said first signal, said first remainder and said second remainder to said producing means to produce a first output signal, means responsive to a second combination of said switching signals to simultaneously apply said second signal, said second remainder and said second signal to said producing means to produce a second output signal.

Claim 13

An arrangement for combining any selected four of six available output signals on an amplitude-sharing basis using a respective parallel connected amplifier for each output signal comprising means for providing unidirectional control signals VR - EAB, EAB, VR - ECD, ECD, VR - EEF, EEF wherein EAB, ECD and EEF are independently adjustable between a lower and an upper amplitude VR, means for modifying the amplitudes of said VR - EAB and said EAB control signals as a function of both ECD and EEF and for modifying the amplitude of said VR - ECD and said E CD control signals as a function of EEF to proviDe respective modified control signals, each of the amplifiers corresponding to the selected output signals being responsive to a respective one of said EEF, VR -EEF, modified EAB, modified ECD, modified VR - EAB and modified VR - ECD control signals for modifying the amplitude of its respective output signal while maintaining the total amplitude of the selected output signals constant over the range of adjustments of said EAB, ECD and EEF signals.

Claim 14

An arrangement for combining any selected four of six available output signals on an amplitude-sharing basis using a respective parallel connected amplifier for each output signal comprising means for providing unidirectional control signals VR - EAB, EAB, VR - ECD, ECD, VR - EEF, EEF wherein EAB, ECD and EEF are independently adjustable between a lower and an upper amplitude VR, means for modifying the amplitudes of said VR - EAB and said EAB control signals as a function of both ECD and EEF and for modifying the amplitude of said VR - ECD and said E CD control signals as a function of EEF to proviDe respective modified control signals, each of the amplifiers corresponding to the selected output signals being responsive to a respective one of said EEF, VR -EEF, modified EAB, modified ECD, modified VR - EAB and modified VR - ECD control signals for modifying the amplitude of its respective output signal while maintaining the total amplitude of the selected output signals constant over the range of adjustments of said EAB, ECD and EEF signals.