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US 3,943,447 AGranted
Method and apparatus for bi-directional communication via existing CATV system
AssigneeComSonics, Inc.
InventorGlen Keller Shomo, III
Life of this patent
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AssigneeComSonics, Inc.
InventorGlen Keller Shomo, III
Estimating the term…
Existing CATV coaxial cable systems are found to present a transparent window, in both the upstream and downstream directions, to communications signals over a frequency band from 10-300KHz, whereby such signals follow the path of the 60Hz power signal throughout the system. Signals in this band do not interfere with the high frequency TV signals being transmitted, and are not subject to interference by such TV signals. This discovery is thus utilized to implement bi-directional communications between any two or more points linked by such a CATV system without requiring any substantial modifications or additions to the existing system components. A specific application utilizes such a communications link to remotely control non-duplication switching in the head or antenna end of a CATV system.
A method for implementing ancillary communications between two or more points linked by a CATV coaxial cable system including a transmitting antenna site, a plurality of remote subscriber sites, coaxial cable means linking the transmitting/antenna site to each of the subscriber sites, a plurality of active and passive circuit components connected in the cable means to implement r.f. signal amplification, signal branching, etc., and at least one alternating current power supply source coupled to the cable means to supply electrical operating power to the active circuit components, said CATV coaxial cable system including at least one input station and at least one output station remotely located from one another at respective ones of said points, said method utilizing a frequency window of 10-300 KHz in said CATV coaxial cable system and comprising the steps of:
A method for implementing the remote control of the relay switches of a non-duplication switcher in a CATV coaxial cable system including a transmitting/antenna site, at which the relay switches are located, a plurality of remote subscriber sites, coaxial cable means linking the transmitting/antenna site to each of the subscriber sites, a plurality of active and passive circuit components connected in the cable means to implement r.f. signal amplification, signal branching, etc., and at least one alternating current power supply source coupled to the cable means to supply electrical operating power to the active circuit components, said CATV coaxial cable system including at least one output station located at said transmitting/antenna site and at least one input station remotely located from said transmitting/antenna site, said method utilizing a frequency window of 10-300 KHz in said CATV coaxial system and comprising the steps of:
An apparatus for implementing ancillary communications between two or more points linked by a CATV coaxial cable system including a transmitting/antenna site, a plurality of remote subscriber sites, coaxial cable means linking the transmitting/antenna site to each of the subscriber sites, a plurality of active and passive circuit components connected in the cable means to implement r.f. signal amplification, signal branching, etc., and at least one alternating current power supply source coupled to the cable means to supply electrical operating power to the active circuit components, said CATV coaxial cable system including at least one input station and at least one output station remotely located from one another at respective ones of said points, said ancillary communication between said two or more points utilizing a frequency window of 10-300 KHz in said CATV coaxial system and comprising:
An apparatus for implementing the remote control of the relay switches of the non-duplication switcher in a CATV coaxial cable system including a transmitting/antenna sight, at which the relay switches are located, a plurality of remote subscriber sites, coaxial cable means linking the transmitting/antenna site to each of the subscriber sites, a plurality of active and passive circuit components connected in the cable means to implement r.f. signal amplification, signal branching, etc., and at least one alternating current power supply source coupled to the cable means to supply electrical operating power to the active circuit components, said CATV coaxial cable system including at least one output station located at said transmitting/antenna site and at least one input station remote from said transmitting/antenna site said apparatus for implementing the remote control of said relay switches utilizing a frequency window of 10-300 KHz in said CATV coaxial system and comprising:
Dependencies are inferred from the claim text.