Motion Recognition Portable Terminal Acceleration Signal Analysis
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Solution Overview
Problem
Conventional motion entry methods in portable terminals are prone to decreased motion detection rates due to severe shaking, slow or fast turn-off of the motion key, and require repeated learning to deactivate the motion key properly, making real-time motion completion detection challenging.
Innovation Solution
A portable terminal with a motion key that activates motion entry, a motion detector measuring three-axis accelerations, and a controller determining motion completion based on acceleration variations, allowing for real-time extraction of motion periods irrespective of the motion key's turn-off, using signal flattening and predetermined thresholds to distinguish motion and halt periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional motion entry method is used where the user activates the motion key, makes a motion, and then deactivates the motion key, then the motion entry can be created, but severe shaking, slow or fast turn-off of the motion key decreases the motion detection rate and requires repeated learning
Solution Approach 1:
The system automatically detects motion completion based on acceleration signal analysis without requiring user intervention to turn off the motion key. The controller monitors the acceleration signal and automatically determines when the motion has completed, eliminating the need for users to learn proper key deactivation timing and reducing errors from improper turn-off.
Solution Approach 2:
The system uses real-time feedback from the acceleration sensor to dynamically determine motion completion. By continuously monitoring the acceleration signal and comparing it against threshold values, the system can accurately detect when motion has ceased, providing reliable motion detection regardless of how the user deactivates the motion key.
2Productivity
If the motion key is turned off quickly or slowly, then the operation is simpler, but the motion detection rate decreases
Solution Approach 1:
The system dynamically adjusts the motion detection criteria based on the actual acceleration signal characteristics. Rather than using fixed timing requirements, the controller continuously evaluates the acceleration signal to determine when motion has truly completed, allowing users to operate at any speed while maintaining detection accuracy.
Solution Approach 2:
The system changes the detection parameter from fixed time-based criteria to acceleration-based criteria. By monitoring the magnitude and duration of acceleration signals, the system can accurately detect motion completion regardless of the speed at which the user activates or deactivates the motion key.
3Ease of operation
If severe shaking occurs during motion key turn-off, then the operation remains simple, but the motion detection rate decreases
Solution Approach 1:
The system converts the harmful effect of severe shaking during key turn-off into a beneficial detection signal. By analyzing the acceleration signal characteristics, the system can distinguish between intentional motion and accidental shaking, using the shaking itself as additional information to confirm or refine motion detection rather than treating it as noise to be filtered out.
Data Source
AI summary
A motion-recognition portable terminal and a motion recognition method therefor are provided. In the portable terminal, a motion key starts to create a motion entry, upon activation. A motion detector measures an acceleration along each axis of the portable terminal, upon activation of the motion key. A controller determines whether the motion entry has been completed based on the variation of the each-axis acceleration.