Beam index type color television receiver

Details Beam index type color television receiver Beam index type color television receiver

H - Electricity

04

N

350/77

H04N 9/24 (2006.01)

Patent

CA 1149930

ABSTRACT OF THE DISCLOSURE A beam index type color television receiver having a beam index type color cathode ray tube which includes a screen having a plurality of groups of color phosphor elements and index phosphor elements, an index signal sensing device for detecting index signals from the index phosphor elements and generating index pulses, a frequency multiplier for multiplying a frequency of the index pulses, a gate signal generator supplied with the output of the frequency multiplier and generating a plurality of gate signals, a gate circuit for sequentially selecting predetermined primary color signals from three primary color signals in response to the gate signals and supplying selected primary color signals to the cathode ray tube, and a velocity, modulating device for modulating a beam scanning velocity of the cathode ray tube. In this case, the color television receiver further includes a video signal level detecting circuit for detect- ing a level of an input video signals, and a velocity modulating signal generating circuit for supplying a velocity modulating signal to the velocity modu- lating circuit in response to the output of the video signal level detecting circuit.

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