Pressure Reference Updating for Accurate Gesture Detection
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Solution Overview
Problem
Existing pressure detection systems in human-computer interaction technologies face accuracy issues due to invalid pressure signals, leading to missed or false detection of user gestures, which affects user experience, especially in devices like headsets where environmental factors like temperature changes and abnormal touch durations impact the pressure reference value.
Innovation Solution
A method that determines a latest pressure reference value by analyzing amplitude and time characteristics of consecutive pressure signals, updating thresholds for positive, negative, and no-pressure conditions, and using an IIR filter to reduce environmental impacts, thereby improving the accuracy of pressure detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure reference value is updated using traditional methods, then the system can maintain basic pressure detection functionality, but the accuracy of pressure detection deteriorates due to invalid signals affecting the reference value
Solution Approach 1:
The system performs preliminary classification of pressure signals into positive pressure signals, negative pressure signals, and no-pressure signals before calculating the pressure reference value. By identifying and excluding negative pressure signals (invalid signals) in advance, the reference value calculation is based only on valid signals, thereby improving both accuracy and stability without requiring complex post-processing corrections
Solution Approach 2:
The patent converts the harmful effect of invalid signals by using the timing characteristics of pressure signals to distinguish between valid and invalid inputs. By analyzing whether pressure signals occur during expected gesture periods or abnormal periods, the system transforms potentially harmful invalid signals into useful information for improving detection reliability through selective inclusion in reference value calculations
2Adaptability or versatility
If the pressure reference value is updated frequently to adapt to environmental changes, then the adaptability improves, but the likelihood of false detections increases due to noise and invalid signals
Solution Approach 1:
Before updating the pressure reference value, the system performs preliminary classification of incoming pressure signals to determine whether they represent valid gestures or invalid conditions. This preliminary action ensures that only genuinely valid pressure changes are incorporated into reference value updates, allowing the system to adapt to environmental changes while filtering out noise and preventing false detections
Solution Approach 2:
The system implements a feedback mechanism where the classified pressure signals continuously inform and adjust the pressure reference value. By using feedback from signal classification results to dynamically update reference values, the system maintains adaptability to environmental changes while ensuring that updates are based on validated information, thereby preventing false detections caused by noise
3Ease of operation
If traditional pressure detection methods are used, then the device complexity remains low, but missed detections and false detections occur reducing user experience
Solution Approach 1:
The patent segments the pressure signal processing into distinct classification stages: identifying positive pressure signals, negative pressure signals, and no-pressure signals. This segmentation allows the system to handle different signal types through dedicated processing paths, improving detection accuracy and user experience while keeping each processing segment relatively simple and manageable
Data Source
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AI summary
Embodiments of the present disclosure provide a method and apparatus for determining a pressure reference value, and a chip and an electronic device. The method includes: consecutively acquiring N pressure signals by a pressure sensor; acquiring consecutive N pressure values on the basis of the N pressure signals; and determining a latest pressure reference value on the basis of the consecutive N pressure values and time characteristics of the consecutively acquired N pressure signals; wherein each of the pressure values is a difference between a sampling value corresponding to a pressure signal and the pressure reference value, and the consecutively acquired N pressure signals are acquired within a duration where a pressure is applied to the pressure sensor once, N being a positive integer greater than 0.