Wired broadcasting systems and apparatus therefor

Claim 2

A wired-broadcasting system which from any one of six signal channels selected from a multiple channel distribution feeder conveys a broadcast program over a cable consisting of a single shielded pair to a receiver at a remote subscriber location, wherein the shielded pair in addition carries over its three conductors all the control signals necessary for selecting any one of said six signal channels, said system comprising in combination, six selection switching devices located in the vicinity of the distribution feeder, a set of six selection switches located in the vicinity of the receiver at the remote subscriber location each switch corresponding to a single one of said selection switching devices, means at said remote subscriber location definiNg six different signals, from actuation of corresponding ones of said switches, each signal capable of being transmitted through said three conductors, and means at the vicinity of said six devices for directing each different signal received through said three conductors to actuate a different one of said six switching devices to thereby select one of said six signal channels for transmission from said distribution feeder to said receiver at the remote subscriber location solely over said shielded pair cable.

Claim 3

A wired-boradcasting system comprising a distribution feeder having a plurality of at least two pairs of conductors, at least one subscriber''s box along the path of said distribution feeder, a subscriber''s feeder extending between subscriber''s box and a subscriber''s terminal unit and consisting of a pair of signal conductors surrounded by an electrically conductive screen thereby providing three conductor paths, switching means at the subscriber''s terminal unit comprising a plurality of selection switches, one for each of said six pairs of conductors with each selection switch having operating solenoids located at said subscriber''s box electrically connected thereto through said three conductor paths, said switches serving to effect selective connection of said pair of signal conductors with only one of the six pairs of conductors in the distribution feeder, and control means operable at or adjacent the terminal unit for controlling the flow of electric current through solely said three conductor paths to said operating solenoids to select a single one of said solenoids designated by a corresponding one of said selection switches including at least two operating solenoids each having a rectifying device arranged in series therewith, two such solenoids with rectifier in series combination being connected in parallel between two of said conductors with said rectifiers connected in opposite polarity and said control means comprising a source of direct current potential for applying a direct current potential of opposite polarities between said two conductor paths thus serving to energize one or other of said operating solenoids in dependence upon its polarity.

Claim 4

A wired-boradcasting system comprising a distribution feeder having a plurality of at least two pairs of conductors, at least one subscriber''s box along the path of said distribution feeder, a subscriber''s feeder extending between subscriber''s box and a subscriber''s terminal unit and consisting of a pair of signal conductors surrounded by an electrically conductive screen thereby providing three conductor paths, switching means at the subscriber''s terminal unit comprising a plurality of selection switches, one for each of said six pairs of conductors with each selection switch having operating solenoids located at said subscriber''s box electrically connected thereto through said three conductor paths, said switches serving to effect selective connection of said pair of signal conductors with only one of the six pairs of conductors in the distribution feeder, and control means operable at or adjacent the terminal unit for controlling the flow of electric current through solely said three conductor paths to said operating solenoids to select a single one of said solenoids designated by a corresponding one of said selection switches including at least two operating solenoids each having a rectifying device arranged in series therewith, two such solenoids with rectifier in series combination being connected in parallel between two of said conductors with said rectifiers connected in opposite polarity and said control means comprising a source of direct current potential for applying a direct current potential of opposite polarities between said two conductor paths thus serving to energize one or other of said operating solenoids in dependence upon its polarity.

Claim 5

A wired-broadcasting system as claimed in claim 2, wherein two oppositely polarized series combinations of an operating solenoid and a rectifying device are arranged in parallel between each of said three conductor paths and another of said conductor paths in a delta configuration whereby any one series combination of operating solenoid and rectifying device is shunted by two similarly polarized combinations connected in series, said source of direct current potential being arranged to apply a potential across any one series combination which is sufficient to cause actuation of the switch associated with the operating solenoid of that combination and is at the same time insufficient to cause actuation of the switches associated with each of the operating solenoids of the two similarly polarized series combinations which are connected in shunt therewith.

Claim 6

A wired-broadcasting system as claimed in claim 2, wherein the subscriber''s equipment includes a bidirectional direct current power source and a switch device by means of which the potential provided by said power source may be applied between any two of the three conductor paths extending between said subscriber''s equipment and the subscriber''s box with either polarity for the purpose of energizing a desired one of said operating solenoids and its associated switch.