Head-Worn Accelerometer Exercise Analysis Without a Gyroscope
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Solution Overview
Problem
Conventional exercise analysis systems using accelerometers struggle to accurately distinguish between left and right, front and rear directions due to power consumption issues with gyroscopes, limiting their effectiveness in wearable devices.
Innovation Solution
An exercise analysis system that utilizes a measurement module with an accelerometer to measure acceleration signals, and an analysis module to calculate 3-axis directional axes by correcting accelerations into a user coordinate system, allowing for accurate classification of exercise postures and derivation of exercise parameters without a gyroscope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a gyroscope is added to distinguish front and rear, left and right directions, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The patent extracts and removes the gyroscope component from the sensor system, relying solely on the accelerometer to achieve direction identification. This eliminates the high power consumption associated with gyroscope operation while maintaining the capability to distinguish front-rear, left-right, and up-down directions through clever algorithmic processing of accelerometer data.
Solution Approach 2:
The patent replaces the mechanical gyroscope system with an accelerometer-based system combined with algorithmic processing. By using the accelerometer to detect gravitational acceleration vectors and applying coordinate transformation algorithms, the system achieves direction identification without the mechanical complexity and power consumption of a gyroscope.
2Measurement precision
If a gyroscope is mounted on wearable devices, then exercise posture analysis accuracy is improved, but device complexity increases
Solution Approach 1:
The patent removes the gyroscope from the wearable device sensor system, retaining only the accelerometer. This simplification reduces device complexity while the patent compensates for the reduced sensor capability through advanced algorithms that process accelerometer data to accurately determine exercise postures and directional information.
Solution Approach 2:
The patent makes the accelerometer perform multiple functions that would traditionally require separate sensors. The single accelerometer is used not only for detecting linear acceleration but also for determining gravitational vector, identifying directional orientation, and classifying exercise postures, thereby reducing overall system complexity.
3Use of energy by moving object
If only an accelerometer is used to measure acceleration signals, then use of energy is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces the need for a gyroscope-based mechanical system with an accelerometer-based system enhanced by algorithmic processing. The accelerometer measures gravitational acceleration vectors, and through coordinate transformation algorithms, the system accurately derives directional information (front-rear, left-right, up-down) that would traditionally require more precise sensors.
Solution Approach 2:
The patent introduces algorithmic processing as an intermediary between the accelerometer and the direction identification output. This software-based intermediary processes the raw accelerometer data, performs coordinate transformations, and extracts directional information, thereby compensating for the accelerometer's limited inherent directional discrimination capability.
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 precise classification of exercise postures and derivation of relevant parameters for sports like swimming, mountaineering, and cycling, providing meaningful feedback and improving exercise analysis accuracy using only an accelerometer.
Implementation Method 1
since the gyroscope consumes much power... using only an accelerometer worn on the head... measuring acceleration signals according to movement of a user's head
Implementation Method 2
a measurement module worn on a user's head to measure an acceleration signal according to movement of the head using an accelerometer
Data Source
AI summary
The present invention relates to an exercise analysis system using a sensor worn on a user's head, and more specifically, to an exercise analysis system for measuring acceleration signals according to movement of a user's head using an accelerometer worn on the head, and separately analyzing exercise postures corresponding to the movement of the head by identifying user's left and right, front and rear, or up and down direction from the measured acceleration signals.