Scan compensation circuit for a television receiver

Details Scan compensation circuit for a television receiver Scan compensation circuit for a television receiver

H - Electricity

01

J

350/102

H01J 29/56 (2006.01) H04N 3/16 (2006.01)

Patent

CA 1100624

ABSTRACT OF THE DISCLOSURE Abrupt transitions in the televised scene between areas of low and high brightness can occasion horizontal sweep system loading to produce raster distortion. Scan compensation circuitry which utilizes the loading of the horizontal sweep system as an input corrects raster position distortion, raster width dis- tortion and raster tearing distortion. Position distortion is corrected by delay of the start of horizontal retrace in order to shift the start of trace. Control of horizontal yoke drive to maintain appropriated yoke drive to CRT anode voltage ration corrects width distortion. Raster tearing is prevented by limiting the drive to the picture tube when sweep system loading would exceed a predetermined threshold.

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