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Tumble-detecting method decreasing false alarm rate

A detection method and false alarm rate technology, applied in the field of human fall detection, can solve the problems of fall detector false alarms, hands on the table or in bags, pockets, etc., to reduce false alarm rate and reduce false alarms Number of times, the effect of reducing the false alarm rate

Inactive Publication Date: 2016-03-30
昆山市华正电子科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the user is not in use, it is likely to be placed on the table or placed in a bag or pocket, and the actual wearer does not fall. However, the existing fall detection method based on the analysis of accelerometer measurement results is likely to False positives will occur

Method used

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  • Tumble-detecting method decreasing false alarm rate
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  • Tumble-detecting method decreasing false alarm rate

Examples

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Embodiment Construction

[0023] like figure 1 , figure 2 and image 3 As shown, a fall detection method that reduces the false alarm rate includes the following steps:

[0024] a. Define the state where the acceleration sensor-based fall detector is vertically worn on the wearer's torso as position one; define the state where the wearer removes the fall detector and places it as position two;

[0025] b. Calibration of the acceleration sensor; use the 1g calibration method of the gravity field to calibrate the Z-axis voltage output of the acceleration sensor, V 1g Indicates that the Z-axis direction of the acceleration sensor is consistent with the reverse direction of gravity, and the voltage output when the acceleration of gravity is 1g; V 0g Indicates the voltage output when the acceleration of gravity is 0g;

[0026] Due to the difference of devices, the voltage output of 0g acceleration of gravity and the voltage output of 1g acceleration of gravity of each acceleration sensor are different....

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Abstract

The invention discloses a tumble-detecting method decreasing a false alarm rate. A user is forced to vertically wear a tumble detector equipped with an acceleration sensor on the trunk, such as the waist (on a belt) (position 1). If the triaxial acceleration sensor detects an intersection angle [alpha] between a Z axis and the gravity direction is less than or equal to 15 degrees, namely the tumble detector is in a vertical state, an operating mode is initiated and the motion state of a wearing user is monitored. When the user takes off the tumble detector and places the tumble detector at will, the triaxial acceleration sensor detects the intersection angle [alpha] between the Z axis and the gravity direction is greater than 15 degrees, namely an intersection angle between the tumble detector in a current state (position 2) and the tumble detector in the vertical state (position 1) is greater than 15 degrees, a sleep mode is initiated and the motion state of the wearing user is not monitored. The tumble detector using the tumble-detecting method may decrease the number of false alarm times and the false alarm rate on the premise of an increase in tumble alarm accuracy.

Description

technical field [0001] The invention relates to the technical field of human body fall detection, in particular to a fall detection method for reducing false alarm rate. Background technique [0002] According to statistics, nearly 50% of the elderly in the country are currently living an "empty nest" or "semi-empty nest". Among them, more than 200 million elderly people are potential users of elderly service products, and the number is increasing by tens of millions every year. With the advent of my country's aging society, the elderly fall, get lost, and sudden illnesses occur from time to time. If the elderly do not receive timely treatment, the rate of disability and death will increase greatly, which will seriously threaten the physical and mental health of the elderly. Health, daily activities, and independent living ability greatly increase the burden on the family. [0003] A fall is defined as a sudden, uncontrolled, unintentional downward displacement of the body t...

Claims

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Application Information

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IPC IPC(8): G08B21/04
Inventor 张文俊
Owner 昆山市华正电子科技有限公司
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