Wearable Accelerometer Posture Detection Without Gyro and Geomagnetic Sensors
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Solution Overview
Problem
Existing wearable electronic devices face challenges in accurately determining user posture due to the limitations of using gyro and geomagnetic sensors, which are difficult to integrate and consume excessive power, hindering the development of services that rely on posture monitoring.
Innovation Solution
A wearable electronic device utilizes an accelerometer to determine roll and pitch angles and estimate yaw angles, correcting acceleration data to determine the user's posture, with an optimized algorithm considering a 90-degree difference between roll and pitch reference axes to reduce computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gyro sensor or geomagnetic sensor is used to determine user posture, then measurement precision is improved, but device complexity increases and power consumption increases
Solution Approach 1:
The patent extracts and removes the gyro sensor and geomagnetic sensor from the wearable device, relying solely on the accelerometer that is already present. This eliminates the complexity of integrating multiple sensors while maintaining posture determination capability through software-based angle estimation algorithms.
Solution Approach 2:
The accelerometer is made to serve multiple functions: it not only detects linear acceleration for motion detection but also estimates rotational angles (roll, pitch, and yaw) through algorithmic processing. This multi-functionality eliminates the need for dedicated rotation sensors.
2Measurement precision
If gyro sensor or geomagnetic sensor is used to determine user posture, then measurement precision is improved, but power consumption increases
Solution Approach 1:
The patent removes the power-consuming gyro and geomagnetic sensors from the system, retaining only the accelerometer. The processed acceleration data from the accelerometer is sufficient for posture estimation, significantly reducing overall power consumption while maintaining functional capability.
Solution Approach 2:
The accelerometer performs dual roles: detecting linear motion and estimating rotational posture angles. This eliminates the need for additional power-hungry sensors dedicated to rotation detection.
3Measurement precision
If accelerometer data is corrected based on roll, pitch, and yaw angles, then posture determination accuracy is improved, but computational load increases
Solution Approach 1:
The patent performs preliminary calculations by pre-determining the relationship between acceleration data and angle values. By establishing this relationship in advance through calibration procedures, the real-time computational load during actual posture monitoring is significantly reduced.
Solution Approach 2:
The patent transforms the raw acceleration data into angle parameters (roll, pitch, yaw) through mathematical transformations. By changing the parameter representation and using optimized calculation methods, the computational complexity is reduced while maintaining accuracy.
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
Enables real-time determination of the user's absolute posture, facilitating various services related to posture correction and monitoring, while minimizing computational requirements and power consumption.
Implementation Method 1
an accelerometer which outputs acceleration data for a movement of the wearable electronic device
Data Source
AI summary
According to certain embodiments, a wearable electronic device comprises: an accelerometer which outputs acceleration data for a movement of the wearable electronic device in real time; an output device which outputs audio or video data; and a processor electrically coupled to the accelerometer and the output device, wherein the processor is configured to: output a first guide using the output device, the first guide commanding a user to keep their head still; output a second guide using the output device, the second guide commanding the user to rotate their head about a predetermined one of a roll, pitch, and yaw axis; and output information on a posture of the user wearing the wearable electronic device, determined based on another acceleration data being output from the accelerometer, after outputting the second guide.