Television system with access control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 12, 1982
Grant Date -
N/A
app pub date -
Jun 11, 1980
filing date -
Jun 15, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
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- [Patents Count]
Cited Art Landscape
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