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Composite type crime preventive sensor

  • US 4,942,384 A
  • Filed: 03/31/1989
  • Issued: 07/17/1990
  • Est. Priority Date: 04/08/1988
  • Status: Expired due to Term
First Claim
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1. A composite type crime preventive sensor comprising:

  • a plurality of sensor units respectively of different detecting systems and employed in combination with one another, means for processing output detecting signals from said sensor units, said means for processing output detection signals including means for correlating each of said output detection signals from the respective sensor units with a corresponding one of a plurality of grades depending on signal level to provide a ranked level value for each of said output detection signals, and means for providing as an output an intruder discrimination signal when a sum of the ranked level values is above a preset reference value, wherein said preset reference value is set to be larger than the largest ranked level of said ranked level values.

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