colour television

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A television system in which the camera filters the light from the scene into the three primary-colour components, red, blue, and green, detected by separate camera tubes. The separate information so obtained relating to the colour of the image is combined with the sound and synchronization signals and transmitted using one of three systems, the American, British, or French. At the receiver, the signal is split again into red, blue, and green components, each being fed to a separate electron gun in the cathode-ray tube of the receiver. By an additive process (see colour) the picture is reconstituted by the beam from each gun activating a set of phosphor dots of that colour on the screen.

Subjects: Physics.

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