Moire interference detection for raster-scanned cathode ray tube

Details Moire interference detection for raster-scanned cathode ray tube Moire interference detection for raster-scanned cathode ray tube

1995-04-19

1998-05-05

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

315370, 3153821, 348806, H01J 2900

Patent

active

057479330

ABSTRACT:
A Moire interference detection apparatus for a raster-scanned cathode ray tube display is provided. The apparatus comprises a band-pass filter for generating an output signal in response to a signal indicative of the pixel frequency of a displayed image in a direction of raster scan falling within the pass band of the filter. Control means varies the center frequency of the pass band of the filter in dependence on an active video period of the image in said direction of raster scan, the spacing of adjacent phosphor elements of the cathode ray display tube of the display in said direction of raster scan, and the scan size in said direction of raster scan.

REFERENCES:
patent: 4314179 (1982-02-01), Tooyama et al.
patent: 4410841 (1983-10-01), Dusard et al.
patent: 4485335 (1984-11-01), Eames, Jr.
patent: 5107188 (1992-04-01), Rindal
patent: 5444500 (1995-08-01), Ten Pierick et al.
patent: 5483359 (1996-01-01), Yumiba et al.

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