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Personal event monitor with linear omnidirectional response

  • US 6,361,508 B1
  • Filed: 04/20/2000
  • Issued: 03/26/2002
  • Est. Priority Date: 04/20/2000
  • Status: Expired due to Fees
First Claim
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1. A device for monitoring the activity of an individual to provide an alarm for detecting anomalous activity by the individual, comprising:

  • a sensor adapted to simultaneously and continuously measure acceleration in three orthogonal axes and to generate a voltage output that is linearly proportional to the amplitude of detected acceleraton by the individual in each axis;

    interface electronics to generate a first reference bias voltage Vref1 for each axis of said sensor;

    amplifier circuit for defining a user adjustable second reference voltage Vref2;

    amplifier circuit for amplifying each voltage output, and for continuously comparing each voltage output to said second reference voltage to produce a digital signal defining a single event;

    a microcontroller for receiving said digital signal, said microcontroller being programmed to discriminate between normal activity and anomalous activity by identifying a continuous series of events within sequences of preselected time intervals and sending an alarm signal upon detection of said anomalous activity;

    an alarm for receiving said alarm signal and signaling an alarm; and

    the microcontroller conserving power when no events are detected.

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