Combined DCAM and transport demultiplexer
First Claim
1. A combined conditional access and transport demultiplexer circuit, comprising:
- means for receiving a transport bitstream comprising a plurality of multiplexed conditional access and product packets, each of said conditional access packets being identified by a conditional access PID and each of said product packets being identified by a respective product PID;
decypting means for decrypting said received packets;
conditional access means for selectively enabling said decrypting means;
one or more output ports;
means for storing a value corresponding to said conditional access PID and one or more values corresponding to selected ones of said product PID'"'"'s;
means for comparing the PID of each of said received packets with said stored PID values; and
means responsive to said comparing means for routing said conditional access packets from said decrypting means to said conditional access means and said product packets from said decrypting means to a selected one of said output ports.
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Accused Products
Abstract
A combined condition access and transport demultiplexer circuit comprises a decryption device receiving a demodulated transport bitstream including a plurality of multiplexed conditional access (CA) and product (e.g. video, audio and data) packets, each CA packet being identified by a CA PID and each product packet by a respective product PID. A comparator is provided for comparing the PID of each received packet with a plurality of stored PID values representing the CA PID and selected product PID'"'"'s. A routing manager is responsive to the comparator for routing received CA packets from the decryption device to a conditional access circuit which controls the decryption device and for routing received product packets to appropriate output ports for further processing.
113 Citations
14 Claims
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1. A combined conditional access and transport demultiplexer circuit, comprising:
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means for receiving a transport bitstream comprising a plurality of multiplexed conditional access and product packets, each of said conditional access packets being identified by a conditional access PID and each of said product packets being identified by a respective product PID; decypting means for decrypting said received packets; conditional access means for selectively enabling said decrypting means; one or more output ports; means for storing a value corresponding to said conditional access PID and one or more values corresponding to selected ones of said product PID'"'"'s; means for comparing the PID of each of said received packets with said stored PID values; and means responsive to said comparing means for routing said conditional access packets from said decrypting means to said conditional access means and said product packets from said decrypting means to a selected one of said output ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification