Wired broadcasting systems

Details Wired broadcasting systems Wired broadcasting systems

H - Electricity

04

N

179/4

H04N 7/10 (2006.01) H04H 1/02 (2006.01)

Patent

CA 1041912

ABSTRACT OF THE DISCLOSURE A wired broadcasting system is described which comprises a plurality of programme signal sources, and a switch for making a connection between a signal cable extending to a subscrib- er and any desired one of said programme 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 semi-conductor switch in respect of each operating coil. The subscriber is provided with a device for controlling the semi- conductor switches to close any one of the contacts and thereby select a programme signal source. Each of the programme signal sources provides a voltage signal which, once that programme signal source has been selected, is applied to the respective semi-conductor switch so as to maintain the selection.

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