Force Sensor Controller Crosstalk Suppression
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Solution Overview
Problem
Force sensors in portable devices face challenges in processing signals effectively due to mechanical crosstalk, which distorts input signals and complicates user interaction detection.
Innovation Solution
A controller is implemented to perform crosstalk suppression and localization operations by generating output sensor signals based on the arrangement of force sensors, using subtraction of fractions from input sensor signals to reduce crosstalk and adaptive algorithms to optimize signal processing, and applying weightings to define locations of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If force sensors are arranged in a device to detect user interactions, then the detection capability is improved, but mechanical crosstalk between sensors distorts the input signals and reduces measurement precision
Solution Approach 1:
The patent converts the harmful mechanical crosstalk between force sensors into a beneficial signal processing opportunity. By measuring the crosstalk effects and using adaptive algorithms to calculate and subtract the interfering signals from adjacent sensors, the system transforms the distortion problem into a solvable mathematical relationship, ultimately improving measurement precision while maintaining multi-sensor detection capability
Solution Approach 2:
The patent implements feedback through adaptive algorithms that continuously analyze sensor signals, identify crosstalk patterns, and adjust signal processing parameters in real-time. The system uses the measured sensor outputs to calculate crosstalk contributions and feeds this information back into the signal processing chain to dynamically compensate for mechanical interference, thereby maintaining high measurement precision across different device configurations
2Measurement precision
If multiple force sensors are used to improve detection accuracy, then the signal processing complexity increases due to crosstalk compensation requirements
Solution Approach 1:
The patent enables the sensor system to self-compensate for crosstalk effects through adaptive algorithms that automatically calculate and correct interfering signals. The system uses its own sensor outputs to identify and eliminate crosstalk contributions without requiring external calibration or complex manual adjustments, thereby reducing processing complexity while maintaining high signal accuracy
Solution Approach 2:
The patent dynamically changes signal processing parameters based on the measured sensor outputs and identified crosstalk patterns. By adapting the processing algorithm parameters in real-time according to the actual sensor conditions and arrangements, the system optimizes the balance between measurement precision and processing complexity for each specific operating scenario
Data Source
AI summary
A controller for use in a device which comprises at least two force sensors in a given arrangement, the controller operable, based on input sensor signals derived from the force sensors, to carry out an arrangement-related operation in which an output sensor signal is generated based on at least two said input sensor signals and the arrangement of the force sensors in the device so that the output sensor signal is dependent on said arrangement.