| 摘要 |
<p>Information transmission system provided with a control means for access to the information. This system comprises a transmission center (2) and receivers (4, 4"...). The transmission center comprises a signal formation circuit (6), a generator (22), a service key, a locking automaton (24) and a message formation circuit (102). Data and messages are transmitted by a circuit (12). Each receiver comprises a receiving element (14), a subscription support (108), a service key restitution circuit (110), an unlocking automaton (38) and an information visualisation device (20). Application to the videotex system ANTIOPE and TITAN or to the EPEOS system. </p> |
