Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-05-03
1985-06-04
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
328104, 307243, H04N 522, H03K 1700, H03K 1756
Patent
active
045218102
ABSTRACT:
A switching arrangement for selecting one of a number of video signals. The circuit includes a switch unit preferably in integrated circuit form of pairs of synchronously operated switches for selecting video signal from a particular one of the video sources. A first switch of each pair is coupled to a respective video source for selectively providing a video signal to a common output when conductive. To provide sufficient isolation at video frequencies, the second switch of each switch pair is coupled between a reference potential and a respective one of a plurality of signal inhibiting stages for providing a control signal to the signal inhibiting stage dependent upon its conductive state. The inhibiting stages are coupled between the video sources and their respective first switches and are responsive to the control signals provided by respective ones of the second switches for selectively attenuating video signal from non-selected video sources and for passing the video signal from the selected video source.
REFERENCES:
patent: 3152319 (1964-10-01), Gordon et al.
patent: 4361854 (1982-11-01), Wolfe
patent: 4363033 (1982-12-01), Lovely
W. T. Shelton, Solid-State Video Switching Matrix, Jul. 1970, discussion of _FIGS. 1-4.
Article by R. C. Gerdes, p. 73, believed to be published in _EDN Magazine sometime between 1970-1975.
National Semiconductor Corporation CMOS Databook, 1981, pp. 5-152 _and 5-156.
Friedline Karl L.
Nigborowicz John J.
Edelman Lawrence C.
Emanuel Peter M.
Martin John C.
Rasmussen Paul J.
RCA Corporation
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