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Combined DCAM and transport demultiplexer

  • US 5,602,920 A
  • Filed: 05/31/1995
  • Issued: 02/11/1997
  • Est. Priority Date: 05/31/1995
  • Status: Expired due to Term
First Claim
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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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