Capacitance Reference Tracking for Double-Layer Earphone Sensors
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Solution Overview
Problem
Capacitance reference values in electronic devices, such as earphones, change due to aging materials and environmental factors, leading to inaccurate capacitance detection and subsequent control issues.
Innovation Solution
A method to track and update the differential capacitance reference value using double-layer capacitive sensors, calibrating it based on minimum values obtained when the device is out of the box and comparing them with real-time values to ensure accuracy, with calibration coefficients adjusting the reference value to adapt to different situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed capacitance reference value is used in capacitance sensors, then the device structure is simple and easy to manufacture, but the detection accuracy deteriorates over time due to material aging and environmental changes
Solution Approach 1:
The patent applies preliminary action by pre-obtaining a minimum differential capacitance value when the device is out of the box, and using this value to initialize or calibrate the differential capacitance reference value before normal operation begins. This preliminary calibration ensures accurate detection from the start while avoiding the need for complex continuous adjustment mechanisms.
Solution Approach 2:
The patent implements self-service by enabling the device to automatically track and update its own differential capacitance reference value during operation. The system monitors real-time differential capacitance values, compares them with the stored minimum value, and automatically adjusts the reference value when improvements are detected, eliminating the need for external manual calibration.
2Measurement precision
If the capacitance reference value is updated frequently to maintain accuracy, then the detection precision improves, but the energy consumption and system complexity increase
Solution Approach 1:
The patent applies periodic action by updating the differential capacitance reference value at specific moments rather than continuously. The system compares real-time differential capacitance values with the stored minimum value at predetermined intervals or triggering events, and only updates the reference value when actual improvement is detected, thereby reducing unnecessary energy consumption while maintaining accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring real-time differential capacitance values and comparing them with both the current reference value and the stored minimum value. This feedback mechanism triggers reference value updates only when the comparison indicates actual improvement, ensuring accurate detection while avoiding wasteful continuous updates and associated energy consumption.
3Measurement precision
If a single-layer capacitive sensor is used, then the device structure is simple, but the detection accuracy deteriorates due to inability to track reference value changes
Solution Approach 1:
The patent applies segmentation by dividing the capacitive sensing into two separate layers: a first capacitive sensor and a second capacitive sensor. This segmentation enables the system to measure differential capacitance changes more accurately by comparing signals from both layers, thereby tracking reference value changes effectively while maintaining relatively simple individual sensor structures.
Solution Approach 2:
The patent implements merging by combining the outputs of two capacitive sensors to generate a differential capacitance signal. By merging the measurement capabilities of both sensors and processing their combined output, the system achieves improved wearing state detection accuracy that overcomes the limitations of a single-layer sensor while keeping the overall structure manageable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures accurate detection of the wearing state and behavior of electronic devices by maintaining a stable and updated capacitance reference, reducing errors and improving user experience.
Implementation Method 1
a capacitive sensor disposed in an earphone or hearing aid to detect the change of capacitance
Data Source
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AI summary
Embodiments of the present application provide a method for determining a capacitance reference, an apparatus for determining a capacitance reference, and a device. The method is applied to a device with double-layer capacitive sensors, and the method comprises: obtaining a first differential capacitance value of the double-layer capacitive sensors, the first differential capacitance value being a minimum differential capacitance value obtained when the earphone is out of an earphone box, and the box being a matching device paired with the device and used to receive the device; and determining a latest differential capacitance reference value according to the first differential capacitance value and a differential capacitance reference value. By tracking and updating the differential capacitance reference value, a more accurate capacitance reference is provided to ensure the accuracy of capacitance change detection, and then to ensure the accuracy of detection on the behavior state of the device.