| 摘要 |
In a system for controlling conditional access systems ( 143, 145, 147, 149 ) in a digital television decoder comprising a signal processing block with a decoder descrambler and a conditional access block with at least one conditional access system, each conditional access system ( 143, 145, 147, 149 ) is provided with a client ( 142, 144, 146, 148 ) supporting communication via a client interface ( 152 ). Furthermore, the conditional access block ( 141 ) is provided with a conditional access client manager ( 151 ), which handles communication with conditional access systems ( 143, 145, 147, 149 ) via the clients ( 142, 144, 146, 148 ) using a client interface ( 152 ) and controls descrambling of signal in the decoder by selecting a conditional access system ( 143, 145, 147, 149 ) responsible for descrambling a currently received signal and configuring the decoder descrambler ( 132 ) depending on the selected conditional access system ( 143, 145, 147, 149 ).
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