Apparatus for synchronizing a source of computer controlled vide

Details Apparatus for synchronizing a source of computer controlled vide Apparatus for synchronizing a source of computer controlled vide

1983-08-31

1985-11-19

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358148, H04N 504

Patent

active

045545820

ABSTRACT:
Synchronization of a source of computer controlled video to a video disc player for interactive application is obtained by sensing when the computer vertical sync leads that of the player and gating out a number of computer clock pulses equaling one video line during a period of one or more video lines. Horizontal synchronization is disabled during the vertical acquisition mode and then is established by modulating the computer clock frequency with a line rate phase error signal obtained from both video sources thereby providing rapid synchronization within approximately two seconds under worst case conditions.

REFERENCES:
patent: 4346407 (1982-08-01), Baer et al.
patent: 4425581 (1984-01-01), Schweppe et al.
patent: 4450442 (1984-04-01), Tanaka
patent: 4464679 (1984-08-01), WArgo
patent: 4498103 (1985-02-01), Aschwanden

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