Redundant Sensing Element Sampling for Noise Compensation
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Solution Overview
Problem
Noise in sensor systems, such as touch screen and capacitive finger-print sensors, causes inconsistent signal amplitude variations across sensor blocks and rows, degrading performance and requiring adjustments to maintain accuracy.
Innovation Solution
Incorporating redundant sensing elements in sensor blocks, which are sampled twice to calculate and subtract signal amplitude differences, allowing for block-to-block and row-to-row adjustments to stabilize error levels, ensuring consistent data across the sensor apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sensor elements are read sequentially in blocks, then the sensor can process large numbers of sensing elements, but noise introduces inconsistent signal amplitude variations between blocks and rows
Solution Approach 1:
The patent applies preliminary calibration actions by sampling redundant sensing elements at multiple positions (beginning, middle, end) of each block to establish baseline amplitude characteristics before actual sensing. This preliminary sampling creates reference data that is used to correct subsequent measurements, preventing noise-induced variations from degrading measurement precision while maintaining the ability to read large numbers of sensing elements in sequential blocks
2Measurement precision
If redundant sensing elements are sampled multiple times to correct noise, then measurement precision improves, but the scanning time and processing complexity increase
Solution Approach 1:
The patent applies partial action by sampling only specific redundant sensing elements at strategic positions (beginning, middle, and end of each block) rather than sampling all sensing elements multiple times. This selective sampling approach achieves sufficient error correction and amplitude normalization while minimizing the additional scanning time required, as the redundant samples are taken during normal block scanning operations without requiring separate full scans
Data Source
AI summary
A sensor system and method that adjusts sensor data to account for the presence of noise that causes variations in signal amplitude between sensor blocks and between sensor rows. In order to account for the presence of noise in a sensor apparatus, various embodiments apply a first adjustment to the sensor data to account for variations in signal amplitude that occur from block to block. Various embodiments may also apply a second adjustment to the sensor data to account for variations in signal amplitude that occur from row to row.