H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/103
H04N 3/16 (2006.01) H04N 9/24 (2006.01)
Patent
CA 1121508
S01236 HORIZONTAL SCANNING RATE CORRECTION APPARATUS ABSTRACT OF THE DISCLOSURE A horizontal scanning rate correction apparatus for a cathode-ray tube, particularly of the beam index color cathode-ray tube type, includes a memory for storing correction values repre- senting deviations of the horizontal scanning rate of the electron beam from a desired scanning rate at each of a plurality of hori- zontal sampling positions along each of a plurality of predetermined horizontal sampling lines which are substantially fewer in number than the horizontal lines along which scanning occurs. During display of a video signal, a selected one of the stored correction values is read out of the memory for each scanning position of the beam along a scanned one of the horizontal lines, with each read correction value, and a corresponding sampling line correction sig- nal produced therefrom, representing the deviation at a correspond- ing horizontal sampling position on one of the sampling lines. A scanned line correction signal is then produced for each horizontal scanning position which is a function of the sampling line correc- tion signal and of the vertical position of the respective scanned line, and the scanned line correction signal is applied to the beam deflection yoke or device to substantially cancel the scanning rate deviation. -i-
341125
Isono Katsuo
Mitamura Ichiro
Gowling Lafleur Henderson Llp
Sony Corporation
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