Apparatus for simultaneously coupling computer video signals to

Details Apparatus for simultaneously coupling computer video signals to Apparatus for simultaneously coupling computer video signals to

1990-10-12

1994-03-29

Lall, Parshotam S.

Pulse or digital communications

Repeaters

Testing

375 36, 395500, 364DIG2, 3649272, 3649273, 36492792, 364929, G06F 1338

Patent

active

052993060

ABSTRACT:
Circuitry is disclosed herein for coupling VGA analog video signals Red, Green, and Blue from a computer to a first signal conditioning circuitry including signal splitting circuitry for providing two sets of the VGA signals. One set of these signals is provided to a color monitor located proximate the computer, and the other set is provided to a cable up to 300 feet in length and having a plurality of discrete conductors. The conductors are coupled at an opposite end of the cable to a second signal conditioning circuitry and to an analog monochrome monitor, the second signal conditioning circuitry including voltage reduction means for reducing the Red, Green, and Blue signals to a reduced, different voltage level for each signal. The reduced signals are then summed to form a monochrome video signal that is provided to the monochrome analog monitor, the color signals each displayed thereon as a different shade of gray in accordance with a reduction factor of each of the voltage reduction means.

REFERENCES:
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patent: 4148069 (1979-04-01), Smiley et al.
patent: 4641262 (1987-02-01), Bryan et al.
patent: 4907146 (1990-03-01), Caporali
patent: 4965559 (1990-10-01), Dye
patent: 5030896 (1991-07-01), Porter et al.
patent: 5089886 (1992-02-01), Grandmougin
Carlson, A. Bruce, "Communications Systems," Third Edition, McGraw-Hill, 1986, pp. 302-307.

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