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Functionally modifiable cable television converter system

  • US 5,003,591 A
  • Filed: 05/25/1989
  • Issued: 03/26/1991
  • Est. Priority Date: 05/25/1989
  • Status: Expired due to Term
First Claim
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1. A cable television converter with remotely modifiable functionality comprising:

  • means for receiving firmware downloaded from a cable television headend;

    means coupled to said receiving means for storing said firmware;

    means for verifying the integrity of said firmware;

    processor means coupled to said storing means for accessing and executing said firmware to provide one or more converter functions dictated by the firmware;

    nonvolatile memory means coupled to said processor means for storing default operation software for said converter; and

    means responsive to said verifying means for causing said processor means to execute said default operation software instead of said firmware in the event the integrity of said firmware is not verified.

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