Television system with access control

Details Television system with access control Television system with access control

1980-06-11

1982-10-12

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 358345, 358347, H04N 716, H04K 104

Patent

active

043542018

ABSTRACT:
A television system with access control comprises a transmitter and receis. 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 unjamming circuit connected to the reception means and working with the service key.
It also comprises a subscription management center and in the transmitter a digital signal generator, a circuit for the formation of digital messages and a data broadcasting system and in the receiver a subscription card, an extraction circuit for the data, and a circuit for restoring the service key. There is also at least one subscription card loading station connected to the subscription management center.

REFERENCES:
patent: 3538243 (1970-11-01), Shanahan et al.
patent: 3934079 (1976-01-01), Barnhart
patent: 3956615 (1976-05-01), Anderson et al.
patent: 3997718 (1976-12-01), Ricketts
patent: 4025948 (1977-05-01), Loshin
patent: 4045814 (1977-08-01), Hartung et al.
patent: 4081832 (1978-03-01), Sherman
patent: 4214230 (1980-07-01), Fak et al.

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