Synchronization of multiple video and graphic sources with a dis

Details Synchronization of multiple video and graphic sources with a dis Synchronization of multiple video and graphic sources with a dis

1997-04-21

1999-06-22

Hsia, Sherrie

Television

Image signal processing circuitry specific to television

Special effects

348564, 348598, 348537, 348567, H04N 974

Patent

active

059147571

ABSTRACT:
A slow Phase Locked Loop (PLL) is utilized to prevent an abrupt change to a video display containing multiple images, when the source of the synchronization is changed. Such displays include Picture in Picture (PIP) television systems and computer displays. By appropriate buffering and memory management, visual disruptions can be minimized by slowly synchronizing the display synchronization signals to the new synchronization source. The slow synchronization also produces a less disruptive visual image when the source, or channel, of a single image display is changed, and allows for smooth visual transitions on displays having inertial elements, such as color wheels.

REFERENCES:
patent: 4970596 (1990-11-01), Johnson
patent: 5155595 (1992-10-01), Robinson
patent: 5414470 (1995-05-01), Hotta et al.
patent: 5418573 (1995-05-01), Basile et al.
patent: 5420641 (1995-05-01), Tsuchida
patent: 5473385 (1995-12-01), Leske

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