SISTEMA DE RADIODIFUSION POR CABLE CON SELECCION DE PROGRAMACONMUTADA Y CONTROLADA POR EL ABONADO

摘要

A wired broadcasting system comprising a central station at which a plurality of television signals are made available, a plurality of exchanges connected to the central station by a plurality of trunk cables on which the television signals are broadcast, and a plurality of subscriber units each connected to an exchange. Each subscriber unit is provided with means for controlling a respective selector at the exchange to select a desired one of the program signals for transmission to that subscriber. Each trunk cable carries a plurality of frequency division multiplexed signals and each selector comprises a first selecting means for selecting the signals on one said trunk cable and a second selecting means for selecting one of the signals on said one trunk cable for transmission to the respective subscriber unit.