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Motor vehicle security sensor system

  • US 5,510,765 A
  • Filed: 01/07/1993
  • Issued: 04/23/1996
  • Est. Priority Date: 01/07/1993
  • Status: Expired due to Fees
First Claim
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1. A security sensor for a motor vehicle comprising:

  • accelerometer means for monitoring vibrations within said vehicle and for generating force signals in response to said vibrations;

    microphone means for monitoring acoustic energy within an interior passenger compartment of said vehicle and generating acoustic signals representative of said acoustic energy;

    first acoustic circuit means coupled to said microphone means for sensing acoustic signals representative of acoustic energy within a first narrow low frequency band and generating low frequency acoustic energy present signals in response thereto;

    second acoustic circuit means coupled to said microphone means for sensing acoustic signals representative of acoustic energy within a second high frequency band and generating high frequency acoustic energy present signals in response thereto; and

    processor means coupled to said accelerometer means, said microphone means, said first acoustic circuit means and said second acoustic circuit means for receiving and processing said force signals, said acoustic signals, said low frequency acoustic energy present signals and said high frequency acoustic energy present signals to detect glass breakage within said vehicle and generate an alarm signal in response to detected glass breakage, said low frequency acoustic energy present signals and said high frequency acoustic energy present signals being sampled in response to force signals exceeding a defined noise level or acoustic signals exceeding a defined sound level.

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