Bidirectional unicable switching system

Details Bidirectional unicable switching system Bidirectional unicable switching system

1981-11-16

1984-07-31

Ng, Jin F.

Telecommunications

Interference signal transmission

455 5, 455 6, 358 86, H04B 106, H04N 100

Patent

active

RE0316393

ABSTRACT:
A two-way cable television broadcasting system wherein a single coaxial cable is used to deliver TV and FM programs to many subscribers with each subscriber having a specific allocated band of frequencies for reception of any desired television or FM program and where each subscriber can independently select the program desired to be seen and/or heard which will be delivered to the subscriber over an allocated band of frequencies. The subscriber drops from said coaxial cable are so arranged that they descend in frequency along the length of the feeder cable. Automatic switching of any incoming program to any drop is achieved by means of converting all incoming channels to a common I.F. frequency at an amplifier or control station and then deconverting said frequency to the desired outgoing band of frequencies.

REFERENCES:
patent: 2064896 (1936-12-01), Espenschied et al.
patent: 3639840 (1972-02-01), Shekel et al.
patent: 3665311 (1972-05-01), Gargini
patent: 3668307 (1972-06-01), Face et al.
patent: 3801735 (1974-04-01), Gabriel
patent: 3806814 (1974-04-01), Forbes
IEEE Spectrum Appl. Report on "Two Way Applications for Cable Television Systems in the '70s," by Jurgen, 11/71 (pp. 39-54).

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