Chroma control for television control apparatus
AssigneeAlpex Computer Corporation
InventorWallace Kirschner
Life of this patent
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Abstract
Apparatus and method for including color control with an apparatus producing "black-and-white" signals for a television receiver. Logic circuits, which activate circuits for the generation of the color-carrying video signals, are responsive to coded or uncoded control information included in a chroma control word which comprises a predetermined number of data bits. This control information includes information for color selection and may provide for sequencing of colors across each horizontal line of display of the receiver. This control information may be updated by a micro-processor which controls image movement on the television screen.
Claims7
Display control apparatus for use with a color television receiver including video signal input terminals, a display tube, and means for scanning said display tube at a predetermined rate in a multiplicity of horizontal lines, comprising
- memory means having a multiplicity of discrete digital storage positions, each of said storage positions corresponding to a preselected image area of said display tube,
- data processor means including storage means for storing therein digital data representing a plurality of image symbols and a plurality of chroma control words, each of said chroma control words containing a digital data representing the chrominance of all of the image areas of at least one horizontal line to be displayed in color,
- means under control of said data processor means for selectively transferring data representing at least one of said image symbols to said memory means,
- means for sequentially reading stored data from said storage positions at said predetermined scanning rate, with each storage position being read essentially as the predetermined image area of the display tube corresponding to that storage position is being scanned,
- means responsive to a selected chroma control word and said means for sequentially reading for generating chrominance signals for each portion of an entire horizontal line to be displayed in color, and
- means for combining said chrominance signals with the output of said means for sequentially reading to produce a color video signal adapted to be coupled to the video signal input terminals of a television receiver.
Display control apparatus for use with a color television receiver including video signal input terminals, a display tube, and means for scanning said display tube at a predetermined rate in a multiplicity of horizontal lines, comprising
- means for generating a digital chroma control word for each horizontal line, each said chroma control word representing the chrominance of each part of its corresponding line intended to be displayed in color,
- color generating means for producing chrominance signals for each horizontal line of scan, said chrominance signals determining the color(s) in which each part of a line is to be displayed,
- decoder means responsive to said chroma control words for enabling said generating means, and
- means for combining said chrominance signals with a luminance signal to produce a composite video signal adapted to be coupled to said video signal input terminals.
Dependencies are inferred from the claim text.