G - Physics – 06 – F
Patent
G - Physics
06
F
352/19, 354/231
G06F 1/04 (2006.01) G09G 1/16 (2006.01) G09G 5/02 (2006.01) G09G 5/12 (2006.01)
Patent
CA 1185377
Abstract of the Disclosure Apparatus for combining video signals from a video source, such as a video disc player (20), with computer- generated graphics/text output on a single display, for overlaying the two. The computer-generated video is provided in RGB format (52); the other video is converted (80) to RGB format if not already in that form and the two sets of RGB signals are provided to a switch (90). The switch (90) (i.e., multiplexer3 selects which one of the two RGB signal sets to display; this selection is made separately for each pixel. In one embodiment, the color of the computer-generated signals (52) controls the switch's selection of source. A master-slave synchronization system (100) maintains registration between the two sets of RGB signals. When the video source is unstable (as, for example, with a video disc player), a master sync generator (130-138) provides a house (coarse) synchronization signal (144) to the video disc player. (For stable sources, this is unnecessary.) The slave synchronization generator (160-270) locks the video switch (30), display (40) and computer video generator (50) to the timing of the video image source (such as video disc player). Thus, the rest of the system tracks the jitter of the video source (20). When i the video disc player (20) is scanning or is being spun up or down, the slave sync generator (160-270) locks onto the house sync signal (148) of the master sync generator, instead of the video disk player's output, to avoid rolling and tearing of the display.
429447
Digital Equipment Corporation
Smart & Biggar
LandOfFree
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