3D Accelerometer Step Counting via Dynamic Energy Analysis
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Solution Overview
Problem
Conventional pedometers face challenges in precisely measuring exercise quantity and calorie consumption due to position-dependent measurement errors, high power consumption, and inability to differentiate between types of exercise, leading to inaccurate data and limited data management capabilities.
Innovation Solution
A pedometer system utilizing a three-dimensional acceleration sensor that continuously monitors and analyzes movement data to accurately count steps and calculate calorie expenditure, with adaptive sampling frequencies based on exercise type and position, while minimizing power usage through intermittent operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical pedometer measures vertical vibrations of pendulum, then step counting is achieved, but measurement precision deteriorates when pedometer position is not vertical
Solution Approach 1:
The patent transitions from a single-axis mechanical pendulum measurement to a three-dimensional acceleration sensor that measures acceleration in three orthogonal directions (X, Y, Z axes). This dimensional expansion allows the system to accurately detect step movements regardless of the pedometer's orientation or placement position, resolving the contradiction between placement flexibility and measurement precision.
2Measurement precision
If pedometer continuously monitors motion, then exercise quantity measurement is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic sampling of acceleration data at predetermined time intervals rather than continuous monitoring. The controller periodically activates the acceleration sensor to collect motion data, then processes this sampled data to determine step information and exercise quantity. This periodic measurement approach maintains measurement accuracy while significantly reducing power consumption compared to continuous monitoring.
3Device complexity
If pedometer simply measures calorie consumption in proportion to steps, then measurement simplicity is maintained, but measurement precision deteriorates due to exercise intensity variations
Solution Approach 1:
The patent dynamically adjusts the calorie consumption calculation by analyzing the characteristics of acceleration data to determine exercise type (e.g., walking, running, jumping). Based on the detected exercise type, the system applies different calorie consumption coefficients or calculation methods. This dynamic adaptation allows the system to accurately reflect the varying calorie consumption associated with different exercise intensities while maintaining reasonable system complexity.
4Adaptability or versatility
If pedometer accumulates exercise data for long periods, then data management capability is improved, but device size increases
Solution Approach 1:
The patent extracts and stores only the essential exercise information parameters (such as step count, exercise type, duration, and calorie consumption) in the controller's memory rather than storing all raw acceleration data. By extracting only the necessary derived metrics and discarding the voluminous raw sensor data, the system achieves long-term exercise data accumulation and management capabilities while maintaining a compact form factor suitable for portable use.
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
The system provides precise measurement of exercise quantity and calorie consumption, reduces power consumption, and allows for detailed data management and differentiation between various types of exercise, enhancing user data accuracy and usability.
Implementation Method 1
The controller 151 measures the quantity of exercise based on dynamic energy detected by the acceleration sensor 153
Implementation Method 2
The controller 151 analyzes the energy information, thereby determining whether or not the acceleration information generated from the output of the acceleration sensor represents a step pattern
Data Source
AI summary
Disclosed are a method for measuring quantity of exercise and an apparatus comprising an acceleration sensor for generating acceleration information by measuring the quantity of exercise according to user movement, sensor control unit for supplying power to the acceleration sensor and sampling the acceleration information generated from the acceleration sensor, a dynamic energy measurement unit for converting the sampled acceleration information into dynamic energy, comparing a local maximum value with a predetermined threshold value if an ascending gradient of the dynamic energy has the local maximum value exceeding a predetermined value and determining a user step if the local maximum value exceeds the predetermined threshold value, a calorie consumption measurement unit for calculating calorie consumption by analyzing an energy level of dynamic energy determined as a user step, a memory for storing information, and a display section for displaying information related to the number of steps and calorie consumption.