Two-Stage Earphone Wearing Detection With Motion Sensors
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Solution Overview
Problem
Existing methods for detecting the wearing state of earphones are inaccurate, leading to unnecessary power consumption and potential user inconvenience due to erroneous detection.
Innovation Solution
Combining acceleration and angular velocity sensors to determine the wearing state of earphones, where the angular velocity sensor is activated only after a first event is detected by the acceleration sensor, reducing power consumption and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only acceleration sensor is used to detect wearing state, then device complexity is reduced, but measurement precision deteriorates due to inaccurate detection
Solution Approach 1:
The detection process is segmented into two stages: first using acceleration sensor to detect basic movement events, then using angular velocity sensor only when needed to determine wearing state. This segmentation allows each sensor to perform its specific function optimally while reducing overall system complexity.
Solution Approach 2:
The angular velocity sensor is activated partially - only when the acceleration sensor detects a potential event (first event). This partial activation reduces power consumption and avoids unnecessary measurements, while still providing enhanced accuracy when needed.
2Measurement precision
If angular velocity sensor is activated continuously, then measurement precision improves, but use of energy deteriorates
Solution Approach 1:
The angular velocity sensor operates periodically rather than continuously - it is activated only after the acceleration sensor detects a first event. This periodic activation maintains measurement precision for critical detection moments while significantly reducing overall power consumption.
Solution Approach 2:
The acceleration sensor performs preliminary detection of movement events before activating the angular velocity sensor. This preliminary action filters out unnecessary detections and triggers the more power-intensive sensor only when truly needed, optimizing the energy-accuracy tradeoff.
3Measurement precision
If angular velocity sensor is used for continuous measurement, then measurement precision improves, but loss of information deteriorates due to drift over time
Solution Approach 1:
The system extracts and utilizes only the necessary angular velocity data at critical moments when wearing state determination is needed, rather than continuously measuring. This extraction approach minimizes accumulation of drift errors while still capturing the essential movement characteristics for accurate detection.
Solution Approach 2:
The acceleration sensor acts as an intermediary that triggers the angular velocity sensor only when necessary. This intermediary role allows the system to leverage the complementary strengths of both sensors - the acceleration sensor for continuous monitoring and the angular velocity sensor for precise event characterization - while minimizing the detrimental effects of continuous angular velocity measurement drift.
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
Accurately determines the wearing state of earphones while minimizing power consumption by leveraging the strengths of both sensors, reducing measurement errors and noise.
Implementation Method 1
an acceleration sensor, for collecting acceleration data of the earphone
Implementation Method 2
an angular velocity sensor, for collecting angular velocity data of the earphone
Data Source
AI summary
A method and device for determining a wearing state of an earphone, and a corresponding earphone, are provided. The method includes determining that the earphone has experienced a first event on the basis of first acceleration data from the earphone. In response to the first event, determining whether the earphone has experienced a second event on the basis of first angular velocity data from the earphone, The method further includes determining the wearing state of the earphone on the basis of a determination result for the two events. In this way, it is possible to accurately determine the wearing state of the earphone while reducing power consumption.