Time-independent, event-based system for receiving and discriminating unique codes from multiple transmitters and method for doing the same

  • US 6,215,389 B1
  • Filed: 04/14/1999
  • Issued: 04/10/2001
  • Est. Priority Date: 04/14/1999
  • Status: Active Grant
First Claim
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1. A method for discriminating among ID codes from a group of desired transmitters and ID codes from undesired transmitters wherein the number of transmissions from undesired transmitters is less than the number of transmissions from desired transmitters, each transmitter having a unique ID code, wherein an array has registers adapted to store ID codes corresponding to the group of desired transmitters, the method comprising the steps of:

  • providing a main array having a plurality of main registers for storing a plurality of main ID codes;

    providing a plurality of main ID code counters each associated with one of the plurality of main registers of the main array;

    incrementing an appropriate one of the main ID code counters whenever a received ID code is stored in one of the main registers or matches one of the main ID codes already stored in one of the main registers; and

    clearing any of the main registers whose associated main ID code counter is below a predetermined main ID code counter threshold when the sum of the main ID code counters exceeds a predetermined main event counter threshold, wherein ID codes from undesired transmitters can be cleared from the main array.

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