Ultrasonic Stylus Stroke Acquisition with Adaptive Pressure Thresholds
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Solution Overview
Problem
Conventional ultrasonic electronic stylus methods for stroke acquisition suffer from low accuracy due to data loss at the end of strokes, as users often write with small forces that do not reach the predetermined pressure threshold, leading to incomplete signal generation and data loss.
Innovation Solution
The method and apparatus for stroke acquisition in the ultrasonic electronic stylus involve detecting pressure thresholds and signal durations to generate additional signals when the initial pressure is below the predetermined value, ensuring continuous data acquisition by adjusting the operation parameters, such as pressure sensor thresholds or signal durations, to capture the entire stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor with a predetermined threshold is used to detect stroke pressure, then the system can generate signals for strong pressure inputs, but data is lost at the end of strokes where pressure is small
Solution Approach 1:
The pressure threshold is dynamically adjusted from a fixed predetermined value to a variable threshold that adapts based on current pressure conditions. When pressure drops below the first predetermined value, the threshold is lowered to a second predetermined value, enabling the system to detect low-pressure stroke endings that would otherwise be missed.
Solution Approach 2:
The system changes the operational parameter (pressure threshold) based on the detected pressure conditions. By switching between two predetermined threshold values, the system optimizes detection sensitivity for different stroke phases, ensuring both strong and weak pressure inputs are captured accurately.
2Measurement precision
If the pressure threshold is lowered to capture low-pressure inputs, then stroke ending data is captured, but false signals may be generated from minor pressure fluctuations
Solution Approach 1:
The threshold dynamically adapts to current pressure levels, being high during normal operation to filter noise and low during stroke endings to capture complete data. This dynamic adjustment maintains reliability while improving detection sensitivity at critical moments.
Solution Approach 2:
The system continuously monitors pressure levels and uses this feedback to adjust the threshold accordingly. When pressure drops below the first predetermined value, the system responds by lowering the threshold to the second value, creating a feedback loop that maintains optimal detection parameters throughout the stroke.
3Loss of information
If signal generation continues after the first predetermined value is reached, then complete stroke data is captured, but energy is wasted on unnecessary signal generation
Solution Approach 1:
The signal generation duration is dynamically controlled based on pressure conditions. The system generates signals only when necessary (when pressure is below the first predetermined value and the second threshold is met), rather than continuously, thereby capturing complete stroke data while minimizing energy consumption.
Solution Approach 2:
Instead of continuous signal generation, the system uses periodic or conditional signal generation triggered by specific pressure conditions. This approach ensures complete data capture during critical low-pressure phases while avoiding unnecessary energy expenditure during high-pressure periods.
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 enhances the accuracy of stroke acquisition by preventing data loss at the end of strokes and optimizing the operation parameters to continue signal generation when initial pressure is low, thereby improving overall data capture and reducing unnecessary input.
Implementation Method 1
ultrasonic electronic stylus
Data Source
AI summary
A method and apparatus for stroke acquisition, and an ultrasonic electronic stylus are provided. The method is applied to the ultrasonic electronic stylus. In the case that the ultrasonic electronic stylus contacts with a writing board and a pressure generated on the writing board by the ultrasonic electronic stylus reaches a first predetermined value, the ultrasonic electronic stylus is controlled to generate a first signal so that a signal receiver of an electronic device acquires a first stroke based on the first signal. After the first signal is generated, an operation parameter of the ultrasonic electronic stylus is adjusted. In the case that the pressure is smaller than the first predetermined value and a preset condition is satisfied, a second signal is generated so that the electronic device continues to acquire a second stroke based on the second signal.