Beam index color television receiver

Details Beam index color television receiver Beam index color television receiver

H - Electricity

04

N

350/78

H04N 9/16 (2006.01) H04N 9/24 (2006.01)

Patent

CA 1119718

SO1224 (S79P102) BEAM INDEX COLOR TELEVISION RECEIVER ABSTRACT OF THE DISCLOSURE In a beam index color television receiver having the screen of its color cathode ray tube provided with color phosphor elements and index elements adapted to be excited by an electron beam as the latter scans the screen, and in which index signals, resulting from the excitation of the index elements by the beam, are employed to control the gating or switching of color signals for modulating the beam so that, at any instant during the scanning of an image area of the screen in each scanning interval, the electron beam is modulated, or has its beam current determined, by the color signal corresponding to the color phosphor element then being scanned by the beam; a potential applied to the cathode ray tube for determining its beam current is controlled so as to maintain constant the level of the index signals during scanning by said beam of a run-in area at the initiation in each scanning interval; and such controlled potential has its level shifted downwardly a predetermined amount to provide a reference potential which is employed as a black signal level for the color signals determining the beam current during scanning of the image area.

335940

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