专利名称：Electronic apparatus for converting digital
image or graphics data to color videodisplay formats and method therefor
发明人：George W. Dalke,Michael D. Buchanan申请号：US05/934630申请日：19780817公开号：US04183046A公开日：19800108
摘要：A digital video color signal generation system for converting image or graphicsdata into a color video display format transforms source image or graphics data into asingle data word comprising three separate groups of data bits which define the videodisplay to be produced in terms of intensity, hue and saturation characteristics, andstores such data bit groups in respectively corresponding fields in a memory to allowindependent user control of one or more of such characteristics. The data bit groupscorresponding to hue and saturation are employed for simultaneously addressingstorage locations in memory devices which contain digital color reference datarepresenting symmetrically mapped combinations of hue and saturation values, whichdata are read-out and delivered to respectively associated multiplying digital-to-analogconverters for producing red, blue and green color video signals. The group of data bitscorresponding to intensity are directly converted to analog signals which are employedto control the reference voltage input of each of the multiplying digital-to-analogconverters in a manner which modulates the magnitude of each of the video signals topermit varying the intensity of the resulting video display without also altering either of
the hue or saturation.
申请人：INTERPRETATION SYSTEMS INC
代理机构：Schmidt, Johnson, Hovey & Williams
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