Personal event monitor with linear omnidirectional response
First Claim
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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Accused Products
Abstract
A monitor device for monitoring the activity of an individual to provide an alarm for anomalous by the individual. The device includes a triaxial accelerometer adapted to measure simultaneously measure acceleration in three orthogonal, linear axes and generate a voltage output identifying the amplitude and frequency of detected motion by the individual in each axis. Also included is interface electronics for receiving the voltage outputs and buffering the voltage outputs to generate a first reference voltage for each axis of the accelerometer. Amplifier electronics amplifies each voltage output and compares each voltage output to the first reference voltage to produce a digital signal. A microcontroller receives the digital signal to compare it to an adjustable second reference voltage. The microcontroller is programmed to discriminate between normal activity and anomalous activity by identifying sensor activity within sequences of preselected time intervals and sending an alarm signal upon detection of the anomalous activity. An alarm for receiving the alarm signal and signaling an alarm completes the device.
130 Citations
9 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification