Cable television radio frequency and AC Power multitap
AssigneeAntec Corporation
InventorsDonald W. Reddick, Dennis Jay Mc Lain, Scott R. Smith
Life of this patent
Estimating the term…
Abstract
A tap for delivering electrical power and video signals to subscriber substations includes an input coupling module for coupling a main video signal and a main power signal from a cable conductor to the tap. Means are provided for generating a subscriber video signal and a subscriber power signal by extracting portions of the signals from the main cable. The subscriber video signals and subscriber power signals then are transmitted to subscriber substations. Communication devices in the subscriber substations can be powered by the subscriber power signal in the absence of electrical power from a power utility.
Claims46
In a system for distributing information to subscriber substations, including a main cable for transmitting a main video signal and a main power signal on a cable conductor having a predetermined cable characteristic impedance, an improved tap for extracting a main video signal and AC power from the main cable, and for delivering a portion of said main video signal and AC power to the subscriber substations comprising in combination:
- first means for coupling said main video signal and said main power signal from said cable conductor to said tap;
- means for generating a subscriber video signal by extracting a predetermined portion of said main video signal received from said first means;
- means for transmitting said subscriber video signal to at least one of said subscriber substations on at least a first subscriber video cable;
- means for generating a subscriber power signal by extracting a predetermined portion of said main power signal received from said first means;
- means for transmitting said subscriber power signal to at least one of said subscriber substations on at least a first subscriber power line;
- and
- second means for coupling the unextracted portion of said main video signal and said main power signal to a second main cable,
- whereby communication devices in said subscriber substations can be powered by said subscriber power signal in the absence of electrical power from a power utility.
In a tap for delivering video signals to subscriber substations from a main cable transmitting a main video signal having a predetermined pass band and a main power signal on a cable conductor, said tap including a coupler for generating a subscriber video signal by extracting a predetermined portion of said main video signal, improved apparatus for supplying power to said subscriber substations from said main cable comprising in combination:
- means for generating a subscriber power signal by extracting a predetermined portion of said main power signal, said means for generating having a resonant frequency outside said pass band;
- and
- means for transmitting said subscriber power signal to said subscriber substations.
In a tap for delivering video signals to subscriber substations from a main cable transmitting a main video signal and a main power signal on a cable conductor, said tap including a coupler for generating a subscriber video signal by extracting a predetermined portion of said main video signal, said main cable comprising a first shield connected to ground at a predetermined location remote from said subscriber substation, said subscriber substation comprising a subscriber ground connection connected to ground adjacent said subscriber substation, improved apparatus for transmitting said extracted predetermined portion of said main video signal to said subscriber substations comprising in combination:
- a line having a second shield connected to said subscriber ground connection and a line signal conductor for transmitting said subscriber video signal to said subscriber substation;
- and
- high pass filter means for filtering frequencies below said pass band from said line signal conductor, whereby hum modulation distortion of said subscriber video signal is reduced.
Dependencies are inferred from the claim text.