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Glass break detection using temporal sequence of selected frequency characteristics

  • US 5,450,061 A
  • Filed: 04/08/1994
  • Issued: 09/12/1995
  • Est. Priority Date: 04/08/1994
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting glass breaking from an impact;

  • said apparatus comprising;

    means for detecting low frequencies characteristic of the glass flexing from the impact, and high frequencies characteristic of the glass shattering; and

    ,means for issuing an alarm signal based in part on said detected low frequencies lasting for a minimum duration related to the magnitude of said detected low frequencies.

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