Capacitance Proximity Sensing with Dynamic Baseline Updating
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Solution Overview
Problem
Conventional capacitance sensing devices fail to timely update their baseline values during prolonged proximity events, leading to misjudgments due to environmental changes, such as temperature and humidity variations.
Innovation Solution
A method involving a signal processing circuit, baseline processing circuit, and proximity sensing circuit that continuously updates the baseline value using multiple procedures based on the difference between detecting data and previous frames, selecting appropriate updating procedures based on the range of this difference to maintain accuracy and adapt to environmental conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the baseline value is frozen during proximity events to prevent misjudgment, then the reliability of proximity detection is improved, but the adaptability to environmental changes deteriorates
Solution Approach 1:
The patent implements dynamic baseline updating by transitioning from a static frozen baseline to a dynamically adjusted baseline that adapts to environmental changes. The baseline processing circuit continuously updates the baseline value during proximity events based on environmental condition detection, resolving the contradiction between maintaining detection reliability and adapting to environmental variations.
Solution Approach 2:
The patent changes the parameter of baseline value from fixed to variable by introducing environmental condition-based updates. The system monitors environmental conditions and adjusts the baseline parameter accordingly during proximity events, allowing the baseline to adapt while maintaining accurate proximity detection through controlled update mechanisms.
2Adaptability or versatility
If the baseline value is continuously updated during proximity events, then the adaptability to environmental changes is improved, but the accuracy of proximity detection deteriorates
Solution Approach 1:
The patent applies local quality by implementing different update strategies for different portions of the baseline adjustment process. The system performs partial updates based on environmental condition changes while maintaining stability for the core baseline value, allowing localized adaptation without compromising overall detection accuracy.
Solution Approach 2:
The patent uses partial action by updating only the necessary portion of the baseline value based on environmental changes rather than complete reupdates. The baseline processing circuit calculates incremental adjustments based on environmental condition variations, applying partial updates that maintain accuracy while adapting to new conditions.
3Stability of the object's composition
If the baseline value is not updated during prolonged proximity events, then the stability of baseline value is improved, but the matching level with environmental conditions deteriorates
Solution Approach 1:
The patent implements periodic action by updating the baseline value at specific intervals or triggers during proximity events rather than continuously. The system monitors environmental conditions and performs baseline updates periodically when significant environmental changes are detected, maintaining stability while ensuring periodic adaptation to new conditions.
Data Source
AI summary
The present application relates to a method of operating a capacitance sensing device comprises: calculating a difference of a raw data compared to one of the raw data received in a previous data frame; and performing a comparison calculation based on the raw data and a stored baseline value to determine whether a proximity event has occurred. Under the proximity event, selects one of several baseline value update procedures based on the magnitude of the difference. Thus, the present application effectively avoids the problem of failure to update the baseline value when the object is close to the capacitance sensing device for a long period of time, which may lead to misjudgment of the capacitance sensing device.