Horizontal scanning rate correction apparatus

Details Horizontal scanning rate correction apparatus Horizontal scanning rate correction apparatus

1979-12-06

1981-12-08

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 67, H01J 2970, H04N 924

Patent

active

043050220

ABSTRACT:
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 representing deviations of the horizontal scanning rate of the electron beam from a desired scanning rate at each of a plurality of horizontal 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 signal produced therefrom, representing the deviation at a corresponding 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 correction 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.

REFERENCES:
patent: 2844759 (1958-07-01), Bryan
patent: 2863937 (1958-12-01), Kalfaian
patent: 4099092 (1978-07-01), Bristow
patent: 4122485 (1978-10-01), Sonntag et al.
patent: 4159484 (1979-06-01), Strathman

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