 Space-saving optical fiber cable closure |
| Referring now to FIG. 1 there is shown an optical fiber cable closure which is designated ... |
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| Fiber optic splice organizer and associated method |
| In view of the foregoing background, it is therefore an object of the present invention to provide ... |
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| Fiber optic splice closure |
| In view of the foregoing background, it is therefore an object of the present invention to provide ... |
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| Optical fiber splice case |
| In accordance with one aspect of the invention, there is provided a housing assembly for enclosing ... |
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| Fiber optic splice closure and associated methods |
| In view of the foregoing background, it is therefore an object of the present invention to provide ... |
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| Fiber optic splice closure including end pivoting slack storage holder and associated methods |
| In view of the foregoing background, it is therefore an object of the present invention to provide ... |
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| Devices for protecting and routing optical fibers in a rack |
| The present invention includes devices for protecting and routing optical fibers in a rack. The ... |
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| Submersible camera |
| We claim: 1. A camera which includes: a housing; a transparent closure at one end of said housing; ... |
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| Visibility expander |
| What I claim is: 1. A picture visibility expander system comprising a viewing device for producing ... |
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| Damping spacers for conductor bundles |
| Having thus described my invention and certain embodiments thereof, I claim: 1. A frameless damping ... |
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Chroma-key signal generator
| Details |
Inventors: Shirakami, Toshiaki;
Assignee: Kokusai Denshin Denwa Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Masinick; Michael A.
Assistant Examiner:
Attorney, Agent or Firm: Burns; Robert E., Lobato; Emmanuel J., Adams; Bruce L.
A chroma-key signal generator is provided which may be utilized to effect an electronic insertion of a picture into another picture, by utilizing a color television signal. The generator includes a first color selection/clip circuit which selects any desired hue signal from three primary color signals and clips it at a given level to provide a first key signal, a second color selection/clip circuit which selects a hue signal of a different hue from the first mentioned hue signal, from the three primary color signals, and clips it at a given level to provide a second key signal, and a logical and arithmetic circuit which logically operates on the first and the second key signal to provide an output signal which is utilized as a key signal. |
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DETAILED DESCRIPTION It is an object of an the invention to avoid the disadvantages of the prior art by providing a chroma-key signal generator which permits the extraction of arbitrary hue as a key signal having a narrow chromaticity range.
It is another object of the invention to generate a key signal corresponding to an object being televised and having a narrow chromaticity range and to improve the extraction of the chroma-key by performing a logical operation on three primary color signals of red, green and blue which may be obtained from a color television camera or which may be obtained from an NTSC signal.
In accordance with the invention, there is provided a chroma-key signal generator comprising a first color selection circuit receiving three primary color signals as inputs and selecting an arbitrary hue signal for an output, a first clip circuit for clipping the hue signal from the first color selection circuit at a given level to output a first key signal, a second color selection circuit receiving the three primary color signals as inputs and selecting and outputting a hue signal which is different from the first mentioned hue signal, a second clip circuit for clipping the hue signal from the second color selection circuit at a given level to output a second key signal, and a logical and arithmetic circuit for receiving the first and the second key signal and for performing a logical and arithmetic operation thereon to output a third key signal.
In a preferred embodiment of the invention, the first and the second color selection circuits as well as the first and the second clip circuits may comprise circuits used in the conventional chroma-key signal generator, while the logical and arithmetic circuit may comprise a logical product circuit.
In this manner, there is obtained a key signal having a vector pattern which has a very narrow chromaticity range.
Because the individual key signals are merely logically processed in the logical product circuit, a degradation in the signal-to-noise ratio in the chroma-key signal can be avoided
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TV Signal 
