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Capacitive sensing security system

  • US 4,684,931 A
  • Filed: 05/14/1985
  • Issued: 08/04/1987
  • Est. Priority Date: 05/14/1985
  • Status: Expired due to Term
First Claim
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1. In a security system having a plurality of sensors arranged in an intrusion defining array, a plurality of separate signal input circuits respectively connected to at least two of the sensors, means connected to the input circuits for generating signals in response to uniform and localized disturbances of said sensors in the intrusion defining array, detector means connected to the signal generating means and the signal input circuits for producing a plurality of separate signal outputs that are directional functions of said disturbances and signal processing means operatively connected to the detector means for rejecting common mode signal components of the signal outputs caused by the uniform disturbances of the sensors to extract intrusion identifying data from the signal outputs.

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