Dynamic Threshold Discrimination Device for Shoe-Mounted Sensor Walking State Detection
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Solution Overview
Problem
Existing walking measurement devices face challenges in efficiently measuring walking states while maintaining low power consumption, particularly due to fixed thresholds that fail to adapt to changes in the user's environment or walking state.
Innovation Solution
A discrimination device that acquires sensor data from a shoe-mounted sensor, stores and calls log data, distinguishes walking states from waveforms, and dynamically sets thresholds based on discrimination results, thereby optimizing power usage and measurement efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a fixed threshold is used for pressure sensing unit output, then power consumption at transmission time can be suppressed, but the device cannot adapt to changes in walking state or environment
Solution Approach 1:
The patent implements dynamic threshold adjustment by continuously monitoring acceleration data and automatically modifying thresholds based on detected walking states. The control unit adapts thresholds in real-time according to the user's walking patterns, transitioning from static to dynamic operation to resolve the contradiction between power saving and adaptability.
Solution Approach 2:
The patent changes the parameter of threshold values from fixed to variable based on acceleration data analysis. By monitoring acceleration magnitude and patterns, the system dynamically adjusts threshold parameters to match actual walking conditions, enabling both power efficiency and environmental adaptability.
2Productivity
If the threshold is set too high, then measurement efficiency deteriorates, but if the threshold is set too low, then power is excessively consumed
Solution Approach 1:
The patent employs feedback mechanisms where the control unit continuously monitors acceleration data from the sensing unit and adjusts thresholds based on detected walking patterns. This closed-loop system ensures thresholds remain optimally set for current conditions, balancing measurement efficiency with power consumption by only triggering transmissions when actual walking is detected.
3Device complexity
If a fixed threshold is used, then device complexity is reduced, but erroneous activation occurs when walking state changes
Solution Approach 1:
The patent transitions from static threshold control to dynamic threshold adjustment based on real-time acceleration monitoring. The control unit automatically adapts thresholds to match current walking states, reducing erroneous activation while maintaining relatively simple device architecture through algorithmic adaptation rather than hardware complexity.
Data Source
AI summary
A discrimination device includes: a log acquisition unit that acquires sensor data including acceleration acquired by a sensor placed in a shoe, a storage unit that stores log data of the sensor data, a log calling unit that calls the log data stored in the storage unit, a discrimination unit that distinguishes a walking state from a waveform of the log data, a threshold setting unit that retains a first threshold and a second threshold, and sets the first threshold and the second threshold based on a discrimination result, and a transmission unit that transmits the discrimination result. When acceleration in the log data has not exceeded the second threshold within a discrimination time, the discrimination device outputs a discrimination result of being erroneous activation, and updates the first threshold based on a value of the acceleration in the traveling direction in the log data according to the discrimination result.