United States Patent 4,578,673
United States Patent 4,578,673
Yianilos, et. al.Mar. 25, 1986

Video color generator circuit for computer

Inventors: Yianilos; Peter N. (Fort Lauderdale, FL); Wajda; Michael L. (Philadelphia, PA).
Assignee: Franklin Computer Corporation (Cherry Hill, NJ).
Appl. No.: 512,284
Filed: Jul. 8, 1983
Intl. Cl.:G09G 1/28;
U.S. Cl.:340/703; 340/701; 358/ 27; 358/903;
Field of Search:340/701, 703, 704, 793; 358/23, 25, 27, 903

References Cited

U.S. Patent Documents
4,149,184Apr., 1979Giddings et al. 340/703
4,183,046Jan., 1980Dalke et al. 340/703
4,278,972Jul., 1981Wozniak 340/703
4,360,804Nov., 1982Ohura 340/703
4,442,428Apr., 1984Dean et al. 340/703
4,466,015Aug., 1984Wargo et al. 358/ 27
4,510,521Apr., 1985Ruprecht et al. 358/ 27

Primary Examiner: Brigance; Gerald L.
Attorney, Agent or Firm: Caesar, Rivise, Bernstein & Cohen, Ltd.


A color video generator for use with a digital computer and a color video display. The computer produces digital data signals, each of which is composed of plural bits which represent a color to be produced. The color video generator produces a color in a portion of the display in response to receipt of an associated one of the first data signals. The color is preselectable. The video generation means operates on a color subcarrier signal composed of three primary color signals and comprises a data code translator having an addressable memory and a video phase modulator having an addressable memory. The translator is responsive to said first data signals for providing second, plural bit digital signals to the phase modulator. The phase modulator operates in synchronism with a phase demodulator in the display and is responsive to receipt of respective ones of the second digital signals. The video generator provides respective output signals during successive portions of one cycle of the color subcarrier signal. Each of the output signals is representative of one of at least three predetermined different amounts of the primary color signals present in that portion of the cycle of the color subcarrier signal as preestablished by the contents of its addressable memory. The output signals are arranged for combination with video synchronization signals and a color burst signal to produce a conventional composite video signal.

5 Claims, 7 Drawing Figures