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Adaptive keypad

  • US 5,510,783 A
  • Filed: 07/13/1992
  • Issued: 04/23/1996
  • Est. Priority Date: 07/13/1992
  • Status: Expired due to Term
First Claim
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1. An adaptive key pad apparatus having at least one key, comprising:

  • a pressure transducer apparatus for each key defining a pressure responsive sensor, each sensor generating a parameter which varies in response to an amount of pressure applied to the sensor;

    a measurement device coupled for obtaining an initial measure of the parameter for each sensor and thereafter intermittently obtaining a subsequent measure of the parameter for each sensor;

    a memory for storing the initial parameter for each sensor;

    a comparing device coupled to the measurement device and to the memory for generating a comparison value for each sensor in response to a comparison of each subsequent parameter measure of that sensor with the initial parameter measure of that sensor and generating an depressed key indication when the comparison value for that sensor meets a first predefined criteria; and

    an adaptive device coupled to the memory and to the measurement device for modifying the initial parameter stored in the memory for each sensor when the subsequent parameter measure for that sensor satisfies a second predefined criteria.

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