Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-10-29
1985-07-23
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358150, H04N 506
Patent
active
045311544
ABSTRACT:
When a source of video signals such as a video disc player is connected to a video display processor (VDP) arranged to overlay a picture with graphics, sync signal jitter and noise often produce an undesirable display in which the overlay moves left/right, bounces up/down, or even repeats. To avoid the problem, an interface circuit has been designed for interposition between the video source and the VDP. The interface includes (a) a video matching/sync stripper circuit for referencing the video signal to the levels generated by the VDP and for extracting the sync signal from the video input, and (b) a clean sync circuit including (1) a phase locked loop for deriving a horizontal sync signal, (2) a sync generator including a low-pass filter for deriving a vertical sync signal, and (3) a summer for combining the separate sync signals into a composite sync signal which is applied to the VDP.
REFERENCES:
patent: 4319275 (1982-03-01), Tanaka
patent: 4346407 (1982-08-01), Baer
patent: 4425581 (1984-01-01), Schweppe
patent: 4450480 (1984-05-01), De La Cierva
patent: 4464679 (1984-08-01), Wargo
patent: 4467357 (1984-08-01), Cantou
AT&T Bell Laboratories
Freedman Barry H.
Masinick Michael A.
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