Dynamic Electrode Selection for Ear-EEG Biosignal Sensing
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Solution Overview
Problem
Customized ear-EEG devices often fail to maintain accurate brain activity measurements due to varying ear sizes and shapes among users, and the need for frequent recalibration, which can be expensive and impractical.
Innovation Solution
A wearable electronic device with a housing featuring multiple electrodes, including active and reference electrodes, that dynamically selects subsets based on impedance, noise, and physical distance using a switching circuit and machine-learning models to optimize signal measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a customized ear-EEG device is made for each user, then measurement accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements dynamic electrode selection where the system automatically switches between different electrode configurations based on real-time signal quality assessment. This allows a single device to adapt to different ear shapes and sizes without requiring custom manufacturing for each user, maintaining measurement accuracy while reducing device complexity
Solution Approach 2:
The system changes operational parameters by selecting different subsets of electrodes based on measured impedance and signal quality. This parameter adaptation allows the device to optimize performance for individual users through software control rather than hardware customization, resolving the contradiction between accuracy and complexity
2Adaptability or versatility
If more electrodes are included in the device, then adaptability to different users is improved, but energy consumption increases
Solution Approach 1:
The patent employs partial action by including more electrodes than simultaneously needed and dynamically selecting only the necessary subset for each measurement session. This approach provides adaptability to different users while conserving energy by activating only the required electrodes during operation
Solution Approach 2:
The system dynamically adjusts the active electrode configuration based on user-specific anatomical characteristics and signal quality requirements. This dynamic adaptation enables versatile user accommodation while optimizing energy consumption by keeping non-essential electrodes inactive
3Ease of manufacture
If electrodes are placed in fixed positions, then device manufacturing is simplified, but measurement reliability decreases due to varying ear anatomy
Solution Approach 1:
The patent divides the electrode array into multiple independent segments or subsets that can be independently activated. This segmentation allows the device to maintain simple fixed-position manufacturing while achieving reliable measurements by selecting and activating only the electrode segments that make proper contact with the specific user's ear anatomy
4Measurement precision
If customization is performed for each user, then measurement accuracy is improved, but time and cost for recalibration increase
Solution Approach 1:
The system performs self-calibration by automatically assessing signal quality and impedance for each electrode and dynamically selecting the optimal subset without requiring manual intervention or time-consuming recalibration procedures. This self-service approach maintains measurement accuracy while eliminating the time loss associated with user-specific customization
Solution Approach 2:
The patent performs preliminary assessment of electrode suitability during initial contact or before measurement sessions, storing this information for rapid retrieval and electrode selection. This preliminary action enables the system to adapt to individual users without requiring time-consuming recalibration during each use
Data Source
AI summary
A wearable electronic device includes a housing, and an electrode carrier attached to the housing and having a nonplanar surface. The wearable electronic device includes a set of electrodes, including electrodes positioned at different locations on the nonplanar surface. The wearable electronic device includes a sensor circuit and a switching circuit. The switching circuit is operable to electrically connect a number of different subsets of one or more electrodes in the set of electrodes to the sensor circuit.