Wearable Device Vibration Detection for Wearing Status
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Solution Overview
Problem
Existing devices intended to be worn by users, such as eyewear, face challenges in accurately determining if the user is wearing the device, leading to potential false positives and energy inefficiencies.
Innovation Solution
The device employs a calculation module and a sensor to obtain a signal representing vibrations produced by the user, and then determines a power spectrum of this signal within a predetermined frequency range (8 Hz to 12 Hz) to accurately determine if the user is wearing the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proximity sensors (capacitive or optical) are used to detect device proximity to user, then detection capability is provided, but false positives occur and measurement precision deteriorates
Solution Approach 1:
The patent uses a sensor to detect mechanical vibrations produced by the user's body (such as heartbeat or body movements) and analyzes the power spectrum in the 8-12 Hz frequency range. This approach leverages the fact that human bodies naturally produce vibrations in this frequency range, allowing accurate distinction between a worn device and merely nearby objects, thereby eliminating false positives while maintaining reliable detection.
2Ease of operation
If device functions are activated continuously to ensure availability, then ease of operation is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic checking of wearing status by continuously analyzing vibration signals in the 8-12 Hz range. Functions are activated only when the analysis confirms the device is being worn, creating a periodic verification mechanism that ensures function availability when needed while minimizing energy consumption by keeping functions dormant during non-wearing periods.
3Measurement precision
If monitoring is performed continuously to ensure accurate physiological parameter detection, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The system performs physiological parameter monitoring only after confirming wearing status through vibration analysis in the 8-12 Hz range. This periodic activation of monitoring functions based on confirmed wearing status ensures accurate physiological measurements when the device is actually being worn, while significantly reducing energy consumption by avoiding continuous monitoring during non-wearing periods.
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
This approach effectively avoids false positives compared to proximity sensors, discriminates between nearby objects and the human body, and allows for efficient energy usage by activating functions only when the device is worn.
Implementation Method 1
obtain a signal representing vibrations produced by the user, to determine, in a predetermined frequency range, a power spectrum of the signal
Data Source
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AI summary
Device, head-mountable device and eyewear intended to be worn by a user. The device is configured for determining if the user is wearing the device. The device is configured to obtain a signal representing vibrations produced by the user, to determine, in a predetermined frequency range, a power spectrum of the signal, to determine, based on the power spectrum, if the user is wearing the device. The predetermined frequency range is from 8 Hz to 12 Hz.