Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1992-08-10
1993-06-15
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358148, H01J 2970, H01J 2976
Patent
active
052202542
ABSTRACT:
Vertical deflection circuitry for substantially eliminating rolling and bouncing in a video monitor, where, for example, the video monitor successively displays images produced by each of one of a plurality of non-synchronized video cameras and an incoming vertical synchronization (synch) signal to the monitor is merely a composite of the individual vertical synch signals generated by each of these cameras. Specifically, the vertical deflection circuitry generates the appropriate vertical sweep signal for a current one of these cameras from this composite synch signal so as to properly locate the corresponding video image generated by this camera on a display screen of the monitor. Inasmuch as the vertical deflection circuitry is re-triggerable, then, whenever an out-of-lock condition occurs between a camera and a monitor, this circuitry can establish a vertical lock condition on the next incoming vertical synch pulse in the composite synch signal rather than requiring numerous vertical frames to occur before vertical synchronization is achieved between that camera and monitor.
REFERENCES:
patent: 3553473 (1971-01-01), Steinbacher
patent: 3681712 (1972-08-01), Waybright
patent: 4387396 (1983-06-01), Tanaka et al.
patent: 4803552 (1989-02-01), Marin
patent: 4992707 (1991-02-01), Arai et al.
"Synch Lock for Vertical Deflection IC", IBM Technical Disclosure Bulletin, vol. 30, No. 4, Sep. 1987, pp. 1606-1607.
American Dynamics Corporation
Blum Theodore M.
Michaelson Peter L.
Moser, Jr. Raymond R.
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