Abstract
This paper reports on a low-pass spatial filtering technique for reduction of noise spikes in capacitive touch screen panels. Filter bandwidth is adjusted by dynamically evaluating attenuation of signal and noise spikes. Based on the experimental results, we boost the signal-to-noise ratio by 15.6 dB and attenuate noise spikes by 19.25 dB. The processed signal yields higher detection accuracy and lower power consumption.
Highlights
T OUCH based human-machine interactivity has become a ubiquitous technology used in displays [1], [2]
The presented algorithm in this paper focuses on smoothing noise spikes to boost signal-to-noise ratio (SNR) while maintaining a desired signal strength level in order to avoid detection errors
The attenuation of the signal strength is undesirable, different coefficients are used for the bandwidth adjustment to retain more signal frequency property, noise spike suffers severer attenuation compared to the touch signal
Summary
T OUCH based human-machine interactivity has become a ubiquitous technology used in displays [1], [2]. Many noise reduction techniques are presented [3]–[10] In this context, noise refers to any unwanted signals that may lead to detection errors. The induced smoothing effect may result in signal distortion in terms of touch presence and position, leading to detection errors, requiring further research. We present an adaptive bandwidth tuning algorithm for the dynamic optimization of spatial filter when the signal and noise conditions are changed.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
