Television system with access control

Details Television system with access control Television system with access control

H - Electricity

04

N

350/30

H04N 7/16 (2006.01)

Patent

CA 1167562

ABSTRACT OF THE DISCLOSURE A television system with access control comprises a transmitter and receivers. The transmitter comprises a video signal and sound signal formation circuit, means for transmitting these signals and a jamming circuit using a service key. Each receiver comprises means for receiving the transmitted signals, means for the display of the picture and for restoring the sound and an un- jamming circuit connected to the reception means and working with the service key. It also comprises a sub- scription management centre and in the transmitter a digital signal generator, a circuit for the formation of digital messages and a data broadcasting system of the type known under the trademark DIDON and in the receiver a subscription card, an extraction circuit for the DIDON data, and a circuit for restoring the service key. There is also at least one subscription support loading station connected to the subscription management centre.

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