Methods and apparatus for reducing electromagnetic interference

Details Methods and apparatus for reducing electromagnetic interference Methods and apparatus for reducing electromagnetic interference

1991-08-06

1992-10-20

Pascal, Robert J.

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

358 36, H01J 2900

Patent

active

051573083

ABSTRACT:
Video signals for each primary color are delayed in time relative to every other primary color video signals. When displayed on a cathode ray tube ("CRT") display, the time delayed video signals will result in a separated color pattern for each image displayed. Separated color images are subsequently realigned through use of electron beam deflection controls affecting the horizontal and vertical displacement of electron beams for each color. Measurement of EMI at a far field point varies between zero (no EMI) and no reduction in measurable EMI, depending on the frequency of the video signals and the amount of time delay induced therein. In alternative embodiments, time shifting of video signals may be accomplished either by discrete filter components, simple propagation delay lines.

REFERENCES:
patent: 4521803 (1985-06-01), Gittinger
patent: 4634930 (1987-01-01), Toshiyasu et al.
patent: 4950955 (1990-08-01), Hoover et al.

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