Television camera
First Claim
1. A television camera adapted to be coupled to an external video device, comprising:
- video pick-up means for providing a video signal;
adjustable video signal control means for adjusting the balance of said video signal;
microcomputer means including a random-access memory having a plurality of addressable storage locations and a central processing unit for controlling the operation of said microcomputer and calculating a system control signal;
a source providing a control level;
first switching control means having inputs respectively coupled to receive the balance-adjusted video signal and said control level and output means coupled to said microcomputer means for selectively coupling one of said inputs to said output means for providing a corresponding data signal to said microcomputer means to be read into one of said storage locations;
digital-to-analog converting means for converting the contents of a selected one of said storage locations to an analog data control signal;
means coupling said analog data control signal from said converting means to said output means of said first switching control means, so that said output means provides as said corresponding data signal a comparison signal based on the selected one of said balance-adjusted video signal and said control level and on said analog data control signal;
signal holding means for storing said analog data control signal;
second switching control means coupled between said digital-to-analog converting means and said signal holding means for selectively coupling the latter to said digital-to-analog converting means;
input terminal means coupled to said external video device to receive a camera control signal provided therefrom; and
output terminal means for providing the system control signal calculated by said microcomputer means to said external video device.
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Accused Products
Abstract
A television camera is adapted to be coupled to an external video device, such as a video tape recorder (VTR) or a camera control unit (CCU) linking it with other cameras. The output video signals from the cameras and VTR can be sequentially switched, mixed, or superimposed automatically to provide special effects. The camera comprises a video pick-up tube providing a video signal; an adjustable video signal control circuit for adjusting the video balance of the video signal; a microcomputer having a RAM with several addressable storage locations and a central processing unit for controlling the operation of the microcomputer and calculating a system control signal; a first switching control to selectively apply the balance-corrected video signal and a control level to the microcomputer to be read into one of the storage locations; a D/A converter for converting the contents of a selected storage location to a data control signal; a signal hold circuit for storing the data control signal; a second switching control for selectively coupling the signal hold circuit to the D/A converter; an input terminal coupled to the external video device to receive a camera control signal provided therefrom; and an output terminal for providing the system control signal, calculated by the microcomputer, to the external video device. Where one such television camera and a VTR are coupled to one another, the system control signal of the VTR can be used to control fade-in and fade-out.
140 Citations
11 Claims
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1. A television camera adapted to be coupled to an external video device, comprising:
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video pick-up means for providing a video signal; adjustable video signal control means for adjusting the balance of said video signal; microcomputer means including a random-access memory having a plurality of addressable storage locations and a central processing unit for controlling the operation of said microcomputer and calculating a system control signal; a source providing a control level; first switching control means having inputs respectively coupled to receive the balance-adjusted video signal and said control level and output means coupled to said microcomputer means for selectively coupling one of said inputs to said output means for providing a corresponding data signal to said microcomputer means to be read into one of said storage locations; digital-to-analog converting means for converting the contents of a selected one of said storage locations to an analog data control signal; means coupling said analog data control signal from said converting means to said output means of said first switching control means, so that said output means provides as said corresponding data signal a comparison signal based on the selected one of said balance-adjusted video signal and said control level and on said analog data control signal; signal holding means for storing said analog data control signal; second switching control means coupled between said digital-to-analog converting means and said signal holding means for selectively coupling the latter to said digital-to-analog converting means; input terminal means coupled to said external video device to receive a camera control signal provided therefrom; and output terminal means for providing the system control signal calculated by said microcomputer means to said external video device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification