Twisted pair communications line system
AssigneeCybex Computer Products Corporation
InventorsWinston J. Stewart, Philip M. Kirshtein, Steven F. Brown, Robert R. Asprey
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Abstract
A transmission system for transmitting analog color video signals wherein a cable comprising multiple twisted pairs is employed, and certain of these pairs are coupled to carry selected color signals as a function of the delay provided by particular twist rates. In certain instances, selected signal delay devices are connected in circuit with certain twisted pairs. By such an arrangement, it has been found that relatively long distances between a computer and monitor may be spanned by relatively low-cost, twisted pair cable commonly used for telephone communications.
Claims9
A video color signal transmission system comprising:
- a plurality of sources of sets of video color signals, each set selectable for transmission and including a (R), (G), and (B) video color signal,
- a plurality of transmitters, one of each for one of each of said (R), (G) and (B) video color signals of a selected said set, each said transmitter including:
- signal balancing circuitry coupled to each said transmitter, thereby providing balanced (R), (G) and (B) video color signal outputs,
- a cross switcher in circuit with each said signal balancing circuitry, thereby providing as a set, balanced (R), (G) and (B) video color signal outputs,
- a transmission cable comprising:
- a plurality of twisted pair communications lines, each twisted pair communications line having a first end and a second end, said first end of each said twisted pair communications line coupled to said cross switcher and said second end of each said twisted pair communications line providing a balanced one of said (R), (G) and (B) video color signal outputs, with a twist rate of each of said twisted pair communications lines effecting a different signal delay, whereby any of said (R), (G) and (B) color signals of a selected set may be selectively applied to any of said plurality of twisted pair communications lines;
- and,
- a plurality of receivers for each said (R), (G) and (B) video color signal, each said receiver comprising:
- a balanced input coupled to said second end of a respective said communications line of said transmission cable,
- an amplifier and balanced to single-ended circuitry coupled to each said second end of each of said twisted pair communications lines, and
- a single-ended monitor output couplable from said balanced to single-ended circuitry.
Dependencies are inferred from the claim text.