Combined DCAM and transport demultiplexer
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United States of America Patent
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Feb 11, 1997
Grant Date -
N/A
app pub date -
May 31, 1995
filing date -
May 31, 1995
priority date (Note) -
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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.
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