Synchronization signal stabilization for video image overlay

Details Synchronization signal stabilization for video image overlay Synchronization signal stabilization for video image overlay

1982-10-08

1984-12-25

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 504, H04N 512

Patent

active

044907419

ABSTRACT:
A system for stabilizing the synchronization (sync) signal provided to a second video display generating a second video signal for the precise overlay thereon of a first video signal from a first video display having a relatively unstable sync signal is disclosed. The stable sync signal is generated by providing the multiplied unstable sync signal to a phase lock loop synthesizer in generating a higher multiple frequency signal which is synchronous with and phase locked with a sync signal of the first video signal and has a frequency which is an integral multiple of the horizontal active line period. The frequency of this signal is an integral multiple of the number of pixels, or dots, per active horizontal scan line of the second video display. By synchronizing the horizontal scan signal of a second video display with this high frequency signal, an integral number of pixels per horizontal scan line is provided. The synthesized, stable horizontal sync signal is then combined with a stable vertical sync signal to form a stable composite sync signal which is provided to the second video display permitting the synchronized overlay thereon of video signals from both video displays.

REFERENCES:
patent: 3855496 (1974-12-01), Ciciora
patent: 4096530 (1978-06-01), Plugge

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