Activity Meter Removal Detection via Acceleration Energy
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Solution Overview
Problem
Existing activity meters misjudge a user's sleep or awake state when the device is removed from the body and placed in a still state, leading to incorrect determinations.
Innovation Solution
Incorporating a removal determining section in the activity meter that uses acceleration energy and gravity components to differentiate between the user wearing the device and it being placed unattached, and a sleep/awake state determining section that assesses the smoothness of acceleration energy to accurately classify the user's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the activity meter is removed from the user's body and placed in a still state, then the device can be stored or transported conveniently, but the acceleration sensor will misjudge that the user is in a sleep state due to the immobile state
Solution Approach 1:
The patent introduces a removal determining section as an intermediary that analyzes acceleration energy and gravity components to detect whether the device has been removed from the user. This intermediary detection mechanism prevents the sleep/awake determination section from making erroneous judgments by filtering out the immobile state of the removed device, thus resolving the contradiction between ease of storage and reliability of state determination.
2Extent of automation
If the activity meter continuously monitors acceleration to determine sleep/awake states, then automatic state determination is achieved, but the device cannot distinguish between user immobility during sleep and device immobility when removed
Solution Approach 1:
The patent segments the determination process into two independent sections: a removal determining section that first checks whether the device has been removed from the user, and a sleep/awake state determining section that then performs state classification. This segmentation allows the system to maintain automatic determination while improving precision by excluding the device-removed state from sleep/awake analysis.
Solution Approach 2:
The removal determining section serves as an intermediary filter between the acceleration sensor and the sleep/awake state determining section. By detecting device removal status through acceleration energy and gravity component analysis, this intermediary prevents false positive sleep state detections, thereby maintaining automation while enhancing measurement precision.
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
Prevents incorrect classification of the user's state when the device is removed or during immobility, ensuring accurate determination of sleep and awake states by analyzing acceleration energy and smoothness levels.
Implementation Method 1
an acceleration sensor configured to detect acceleration in at least one axis direction
Data Source
AI summary
According to an embodiment, an activity meter includes an acceleration sensor configured to detect acceleration in at least one axis direction, an acceleration energy detection section configured to detect acceleration energy based on an acceleration signal of the acceleration sensor and a control section. The control section determines removal of the activity meter from a target person based on acceleration energy detected by the acceleration energy detection section and an acceleration component in a direction of gravity in the acceleration signal of the acceleration sensor.