Twisted pair communications line system
AssigneeAvocent 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.
Claims10
A video color signal transmission system comprising:
- a plurality of selectable sources of sets of video color signals, each set selectable for transmission and including red, green and blue video color signals,
- a plurality of transmitters, one of each for one of each of said red, green and blue video color signals of a selected said set, each said transmitter including:
- a single-ended to balanced signal converter responsive to each said video color signal, thereby providing sets of balanced red, green and blue 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 one of said balanced video color signal outputs and said second end of each said twisted pair communications line providing a balanced one of said red, green and blue video color signal outputs, with a twist rate of each said twisted pair communications line effecting a signal delay;
- a plurality of receivers, one of each for one of each said red, green and blue video color signal, each said receiver comprising:
- a balanced input coupled to said second end of a respective said twisted pair communications line of said transmission cable,
- an amplifier and balanced to single-ended converter coupled to said balanced input, and
- a single-ended video signal color output coupled from said balanced to single-ended converter to a selected one of a plurality of monitors.
Dependencies are inferred from the claim text.