Telegraphy – Systems – Printing
Patent
1975-09-17
1977-02-08
Griffin, Robert L.
Telegraphy
Systems
Printing
178DIG13, 179 1B, 325393, 325394, H04N 710
Patent
active
040074242
ABSTRACT:
A wired broadcasting system is described which comprises a plurality of program signal sources, and a switch for making a connection between a signal cable extending to a subscriber and any desired one of said program signal sources. The switch comprises a plurality of electro-magnetically operable contacts connected between respective ones of the signal sources and the signal cable, an operating coil in respect of each contact, and a semiconductor switch in respect of each operating coil. The subscriber controls the semiconductor switches to close any one of the contacts and thereby select a program signal source. Each of the program signal sources provides a voltage signal which, once that program signal source has been selected, is applied to the respective semi-conductor switch so as to maintain the selection.
REFERENCES:
patent: 2205272 (1940-06-01), Powell
patent: 2226692 (1940-12-01), Brunner
patent: 3244809 (1966-04-01), Fuller et al.
patent: 3566020 (1971-02-01), Kinross
patent: 3920906 (1975-11-01), Gargini
Gabriel R. P., Dial A Program, Proc. IEEE, vol. 58, No. 7, July 1970.
Brown Laurence R.
Communications Patents Limited
Griffin Robert L.
Ng Jin F.
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