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Microchips and remote control devices comprising same

  • US 5,517,187 A
  • Filed: 02/18/1993
  • Issued: 05/14/1996
  • Est. Priority Date: 05/29/1990
  • Status: Expired due to Term
First Claim
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1. A system which includes an encoder microchip and a decoder microchip, wherein:

  • said encoder microchip comprises;

    means for storing an identification number,means for storing a counter value,means for changing the value of said counter value each time the encoder microchip is operated, andencoding means for performing a nonlinear encoding function on said counter value using said identification number, so as to generate a transmission value;

    said decoder microchip comprises;

    means for storing a second identification number,means for receiving said transmission value from said encoder microchip,means for performing a decoding function on said transmission value using said second identification number, so as to generate from said transmission value a decoded counter value,means for storing a second decoded counter value obtained from the decoding of a transmission value of a previous transmission by said means for performing a decoding function; and

    means for performing a format scan on signals so as to identify signals conforming to a specific format.

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