Wearable Sensor Wearing Position Detection Using Motion and Height Signals
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Solution Overview
Problem
Existing on-body sensing devices face challenges in accurately detecting their wearing position on the user's body, which affects the accuracy of activity type recognition and energy expenditure calculations, and requires user intervention or multiple interactions.
Innovation Solution
A sensing device equipped with a motion sensor and a height sensor connected to a computing unit, which automatically determines the wearing position by analyzing motion and height signals, using classification algorithms and extracted parameters to improve detection accuracy without requiring user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sensing device uses only acceleration data for activity monitoring, then the device complexity is low, but the accuracy of activity type recognition and energy expenditure calculation deteriorates without knowledge of sensor location
Solution Approach 1:
The patent introduces additional measurement parameters (height/altitude changes) to the existing acceleration data. By combining these different types of parameters, the system achieves more accurate activity recognition and energy expenditure calculation without significantly increasing device complexity, as both sensors can be integrated into a single wearable unit.
Solution Approach 2:
The sensing device is designed to perform multiple functions: it simultaneously monitors acceleration, measures height changes, detects wearing position, recognizes activity types, and calculates energy expenditure. This multi-functional approach allows the device to compensate for the limitations of using only acceleration data while maintaining a compact form factor.
2Measurement precision
If the sensing device requires user input or multiple interactions to detect wearing position, then the measurement precision of wearing position detection is improved, but the ease of operation deteriorates
Solution Approach 1:
The system performs self-service by automatically detecting the wearing position through algorithmic analysis of acceleration and height data patterns. The computing unit processes the sensor data to identify characteristic motion patterns associated with different body locations, eliminating the need for user input or manual configuration while maintaining accurate detection.
Solution Approach 2:
The system uses feedback from the sensor data itself to determine wearing position. By continuously monitoring the relationship between acceleration patterns and height changes, the system can infer the sensor's location on the body and adjust its activity recognition algorithms accordingly, creating a closed-loop system that adapts without user intervention.
3Ease of operation
If the sensing device uses multiple sensor types and complex algorithms to automatically detect wearing position, then the ease of operation improves, but the device complexity increases
Solution Approach 1:
The patent segments the detection process into distinct functional modules: acceleration sensing, height sensing, data processing, pattern recognition, and wearing position determination. This modular approach allows the complex functionality to be organized in a manageable way, making the device easier to implement and maintain despite the multiple sensors and algorithms involved.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables accurate and automatic detection of the wearing position, enhancing the reliability of activity monitoring and fall detection by reducing false alarms and improving activity level calculations.
Implementation Method 1
a motion sensor for detecting a motion signal
Implementation Method 2
a height sensor for detecting a height signal
Data Source
AI summary
The invention relates to sensing device for detecting the wearing position of the device with respect to a user. The device comprises a motion sensor for detecting a motion signal, a height sensor for detecting a height signal and a computing unit. The computing unit receives the motion signal and the height signal, and based thereon determines the wearing position of the sensing device with respect to the user. In embodiments, parameters related to movement of the user are extracted from the signals, and the wearing position is detected from these parameters by means of a classification algorithm.