User Interaction Detection with Cross-Talk Removal in Haptic Sensors
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Solution Overview
Problem
Cross-talk in sensor signals caused by actuator feedback interferes with the detection of subsequent user interactions, leading to unreliable feedback and false user interaction detection in electronic devices.
Innovation Solution
A processor is used to identify and remove or ignore cross-talk in sensor signals, allowing for accurate detection of user interactions by generating a new signal or ignoring the cross-talk, thereby improving the reliability of feedback in electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If haptic feedback is provided after each button press, then user feedback reliability is improved, but cross-talk in sensor signals prevents subsequent interactions from being detected
Solution Approach 1:
The patent extracts and removes cross-talk signals from the sensor output signal. The processor identifies cross-talk components caused by actuator operation and subtracts them from the total signal, leaving only the genuine user interaction components for accurate detection.
Solution Approach 2:
The patent introduces an intermediary processing stage between the sensor and the interaction detection logic. The processor acts as a mediator that separates cross-talk from genuine interaction signals, allowing both haptic feedback and accurate interaction detection to coexist.
2Device complexity
If cross-talk is not removed from sensor signals, then signal processing is simpler, but false user interactions are detected leading to incorrect feedback
Solution Approach 1:
The patent applies preliminary action by pre-characterizing the cross-talk signal profile during system calibration. The cross-talk characteristics are stored and then used to compensate for cross-talk in real-time operation, simplifying the ongoing signal processing while maintaining high detection accuracy.
3Volume of moving object
If sensor and actuator are closely coupled, then device size is reduced, but cross-talk interference increases
Solution Approach 1:
The patent converts the harmful cross-talk effect into a beneficial signal characteristic. By characterizing the cross-talk profile and using it for compensation, the system transforms what was previously interference into a known, correctable component, enabling accurate interaction detection despite close coupling of sensor and actuator.
Data Source
AI summary
Broadly speaking, embodiments of the present techniques provide a method for identifying user interactions with an electronic apparatus. It is desirable to provide feedback to a user each time they interact with certain parts of the electronic apparatus. However, an actuator used to provide the feedback may interfere with a signal output by a sensor, such that it becomes difficult to identify true subsequent user interactions. The present techniques provide ways to process a raw signal output by a sensor to enable user interactions to be more easily distinguished from the interference (e.g. cross-talk).