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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 |
| 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
| 4,149,184 | Apr., 1979 | Giddings et al. | 340/703 |
| 4,183,046 | Jan., 1980 | Dalke et al. | 340/703 |
| 4,278,972 | Jul., 1981 | Wozniak | 340/703 |
| 4,360,804 | Nov., 1982 | Ohura | 340/703 |
| 4,442,428 | Apr., 1984 | Dean et al. | 340/703 |
| 4,466,015 | Aug., 1984 | Wargo et al. | 358/ 27 |
| 4,510,521 | Apr., 1985 | Ruprecht et al. | 358/ 27 |
Primary Examiner: Brigance; Gerald L.
Attorney, Agent or Firm: Caesar, Rivise, Bernstein & Cohen, Ltd.
Abstract
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
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