Deflection control apparatus for a beam index color...

Details Deflection control apparatus for a beam index color... Deflection control apparatus for a beam index color...

H - Electricity

04

N

350/77

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

Patent

CA 1223337

ABSTRACT OF THE DISCLOSURE Deflection control apparatus for a beam index color television receiver includes a phase-locked loop for synchronizing an oscillating signal with an index signal generated by an electron beam scanning index stripes on the screen of the cathode ray tube of the receiver. The oscillating signal is supplied to a color switcher so that the scanning electron beam is modulated with color information corresponding to the respective color phosphor stripe being scanned. An error signal representative of the horizontal scanning speed of the beam is supplied to a deflection device to cause the generation of a compensating magnetic field to correct for non-linearities in the scanning speed. A compensation circuit delays the error signal so that the elapsed time from the detection of the scanning of one of the index stripes to the time of generation of the compensating magnetic field in accordance therewith equals one horizontal line period.

468112

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