Rolling code security system

  • US 6,154,544 A
  • Filed: 06/11/1997
  • Issued: 11/28/2000
  • Est. Priority Date: 05/17/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A transmitter for sending an encrypted signal to control an actuator, comprising:

  • oscillator for generating a radio frequency oscillatory signal;

    apparatus for enabling the sending of an encrypted signal;

    binary code generator responsive to the enabling apparatus for generating a variable binary code, said variable code being different for each enabling by the enabling device;

    trinary code generator for generating a three-valued or trinary code responsive to the variable binary code; and

    transmitting apparatus for modulating the radio frequency oscillatory signal with the trinary code to produce a modulated trinary coded variable radio frequency signal for operation or control of a secure actuator.

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