Capacitive Touch Signal Noise Filtering via Multi-Area Intensity Comparison
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Solution Overview
Problem
Capacitive touch devices are prone to producing noise due to radio-frequency interference and environmental factors, leading to faulty judgments and power wastage.
Innovation Solution
A method that filters out noise signals by comparing signal intensity values across multiple sensing areas, discarding signals if the middle area's intensity is weaker than the surrounding areas, using a preset value to determine noise from normal signals, and implementing this through software or firmware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch device senses signal based on capacitance electrical characteristic, then touch position can be detected, but noise is produced due to RF interference and environment variations
Solution Approach 1:
The touch device is divided into multiple sensing areas (first sensing area, second sensing area, third sensing area) that independently detect signal intensity values. This segmentation allows the system to compare signals across different regions and identify noise patterns, thereby improving touch detection accuracy while filtering out environmental interference.
Solution Approach 2:
A signal processing method acts as an intermediary between the raw capacitance signals and the final touch detection result. This intermediary process compares signal intensity values across multiple sensing areas and discards abnormal signals that do not meet the predetermined conditions, effectively filtering noise while preserving valid touch information.
2Reliability
If signal filtering method compares signal intensity values across multiple sensing areas, then noise can be reduced, but device complexity increases
Solution Approach 1:
The method changes the parameter being analyzed from raw capacitance values to signal intensity values derived from capacitance variations. By transforming the data representation and comparing intensity values across multiple sensing areas against predetermined conditions, the system achieves reliable noise filtering through software logic rather than additional hardware components.
3Measurement precision
If abnormal sensed signals are discarded based on signal intensity comparison, then faulty judgments are reduced, but power consumption increases due to continuous monitoring
Solution Approach 1:
The signal processing system serves itself by using the inherent spatial distribution characteristics of valid touch signals versus noise. The method automatically identifies and discards abnormal signals by comparing intensity values across sensing areas, eliminating the need for external intervention or additional power-intensive verification processes.
Data Source
AI summary
A method for filtering out signals of a touch device includes following steps: first, obtaining a touch signal; next, obtaining signal intensity values respectively corresponding to a first sensing area, a second sensing area and a third sensing area according to the above-mentioned touch signal, wherein the above-mentioned second sensing area is located between the above-mentioned first sensing area and third sensing area; then discarding the touch signal if the signal intensity value of the above-mentioned second sensing area is less than the signal intensity values of the first sensing area and the third sensing area. In this way to discard the noise signal, the present invention is able to increase the accuracy and the stability of a capacitive touch device.