Wired television broadcasting system
AssigneeCommunications Patents Limited
InventorEric J. Gargini
Life of this patent
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Abstract
There is disclosed a wired television system comprising a source of television signals supplying signals to a transmission network, subscriber stations connected to the network, means for preventing reception of transmitted signals by at least one subscriber station, and means for overriding the preventing means to enable that subscriber to receive the transmitted signals. The television signals are heterodyned with a scrambling signal to provide the transmitted signals, and the scrambling signal is transmitted over the network. At the subscriber station, the transmitted signals and the scrambling signal are heterodyned to recover the television signal.
Claims6
A wired television system comprising a source of television signals supplying signals to a transmission network, a plurality of subscriber stations connected to the network, means for preventing reception of transmitted signals by at least one subscriber station, and means for overriding the preventing means to enable said at least one subscriber to receive said transmitted signals, characterised in that the preventing means comprise means for heterodyning television signals and a scrambling signal to provide said transmitted signals, and the overriding means comprise means for transmitting the scrambling signal over the transmission network, and means associated with the subscriber station for receiving the transmitted signals and the scrambling signal and for heterodyning the transmitted signals and the scrambling signal to recover the modulated television signals.
Dependencies are inferred from the claim text.