Portable Terminal Reference Tilt Measurement via Vibration Filtering
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Solution Overview
Problem
Accurate measurement of reference tilt in portable terminals is challenging due to vibrations caused by button presses and user movement, leading to errors in tilt calculations, especially in small-sized devices.
Innovation Solution
A method involving a movement sensor and controller that divides time into sections, calculates standard deviation, and determines a time section with minimal movement to set the reference tilt by averaging acceleration values or sum of weight values, thereby reducing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference tilt is measured at the press of the button, then the tilt information can be obtained, but the measurement accuracy deteriorates due to vibration occurring when the button is pressed
Solution Approach 1:
The system performs preliminary actions by measuring acceleration values before the button press event and using those pre-measured values to calculate the reference tilt. This avoids measuring during the harmful vibration period, thereby resolving the contradiction between obtaining tilt information and maintaining measurement accuracy.
Solution Approach 2:
The invention extracts the acceleration measurement process from the button press moment and separates it into a preliminary phase. By taking out the measurement action from the harmful vibration context, the system obtains accurate tilt data without the contamination of button-press-induced vibrations.
2Measurement precision
If the reference tilt is measured when the user presses the button, then the tilt data can be captured, but the measurement accuracy deteriorates due to user movement causing acceleration components to be reflected in the calculation
Solution Approach 1:
The system performs acceleration measurement in advance before the user completes their movement and button press action. By capturing the acceleration state preliminarily when the user is more likely to be stationary, the system eliminates the error introduced by movement-related acceleration components during the button press.
Solution Approach 2:
The invention applies preliminary anti-action by measuring acceleration before the harmful user movement occurs. This preemptive measurement prevents the movement-induced acceleration errors from contaminating the reference tilt calculation, effectively counteracting the harmful effect before it can affect the measurement.
3Measurement precision
If the acceleration is measured continuously, then the tilt information can be obtained, but the measurement accuracy deteriorates due to the inclusion of vibration and movement artifacts in the calculation
Solution Approach 1:
The system segments the measurement process into distinct phases: a preliminary acceleration measurement phase before button press, and a separate tilt calculation phase. This segmentation allows the system to distinguish between valid tilt information and harmful vibration/artifact information, thereby maintaining measurement accuracy while obtaining complete tilt data.
Solution Approach 2:
The invention extracts the valid acceleration data from the continuous measurement stream by identifying the specific time window before the button press when the user is likely stationary. This extraction separates the useful tilt information from the harmful vibration and movement artifacts that would otherwise be included in continuous measurements.
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
This approach improves the accuracy of reference tilt measurement by minimizing the impact of vibrations and user movement, ensuring a stable and precise tilt calculation for enhanced gaming experiences on portable terminals.
Implementation Method 1
measuring a tilt of the portable terminal using a gravitational acceleration value
Data Source
AI summary
The present invention discloses a portable terminal that measures a reference tilt and a method of measuring the reference tilt using the same. The portable terminal includes a movement sensor for measuring a tilt of the portable terminal using a gravitational acceleration value, and a controller for dividing a preset time into separate time sections and measuring an acceleration value in each separate time section by using the movement sensor, calculating a standard deviation of the accelerations in each separate time section and determining one time section in which movement is minimal, and calculating a tilt of the portable terminal from an average of the accelerations in the determined one time section or a sum of weight values therein and setting the calculated tilt as the reference tilt of the portable terminal.