Earphone Wearing State Detection via Feedback Microphone Audio Analysis
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Solution Overview
Problem
Current wearing state detection methods for true wireless stereo earphones, such as capacitive and optical sensor solutions, often inaccurately determine whether the earphones are in-ear or not, leading to user experience issues and increased power consumption.
Innovation Solution
A method and apparatus that utilize a feedback microphone to collect audio signals, perform power spectrum analysis, and determine a target frequency with sufficient power to accurately assess the wearing state by comparing the target power information against set threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If capacitive sensor detection solution is used, then cost is reduced and housing appearance is improved, but misoperation rate increases
Solution Approach 1:
The patent introduces audio signals as an intermediary medium for detection. Instead of directly sensing capacitance changes that cause misoperations, the system uses the feedback microphone to capture audio signals and analyzes frequency spectrum characteristics. This intermediary approach transforms the detection mechanism from direct physical contact sensing to indirect acoustic signal analysis, thereby reducing misoperations while maintaining cost-effectiveness.
Solution Approach 2:
The patent replaces the capacitive sensing mechanism (electrical field-based) with an acoustic signal analysis mechanism. By substituting the mechanical/electrical detection system with audio frequency spectrum analysis, the system achieves more reliable wearing state detection without incurring the costs associated with optical sensors.
2Measurement precision
If optical sensor detection solution is used, then detection accuracy is improved, but cost increases and production requirements become more stringent
Solution Approach 1:
The patent utilizes the feedback microphone, which is already present in the earphone for noise cancellation purposes, to perform wearing state detection. This approach repurposes an existing low-cost component rather than adding expensive optical sensors, achieving accurate detection while minimizing additional manufacturing costs and complexity.
Solution Approach 2:
The feedback microphone serves dual functions: noise cancellation and wearing state detection. By making this component multi-functional, the patent eliminates the need for separate optical sensors, thereby reducing cost and production complexity while maintaining detection accuracy through audio signal analysis.
3Ease of operation
If optical sensor or capacitive sensor is used, then wearing detection function is achieved, but power consumption increases due to misoperations
Solution Approach 1:
The patent leverages the feedback microphone and implements feedback-based audio signal analysis. By continuously monitoring the audio frequency spectrum and comparing it against predetermined thresholds, the system accurately determines wearing state without false positives. This feedback mechanism ensures that power-consuming operations (such as pausing music or activating noise cancellation) are triggered only when truly warranted, thereby reducing unnecessary power consumption.
4Measurement precision
If audio signal analysis is performed, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential frequency spectrum characteristics from the audio signal that are relevant for wearing state detection. Instead of analyzing the entire audio signal in detail, the system focuses on specific frequency ranges and power threshold comparisons. This extraction approach maintains high detection accuracy while minimizing processing complexity by concentrating computational resources on the most discriminative features.
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
Improves the accuracy of wearing state detection, reducing misoperations and power consumption by effectively distinguishing between in-ear and out-ear states through audio signal analysis.
Implementation Method 1
performing audio collection by a feedback microphone of the earphone to obtain a feedback audio signal
Implementation Method 2
performing a power spectrum analysis on the feedback audio signal to obtain a power spectrum of the feedback audio signal
Data Source
AI summary
Disclosed are a method and an apparatus for detecting a wearing state of an earphone, an earphone, and a storage medium. The method includes: obtaining a request for detecting the wearing state of the earphone; performing audio collection by a feedback microphone of the earphone to obtain a feedback audio signal; determining a frequency of the audio, and determining a target frequency with a power meeting a preset condition in the feedback audio signal based on the frequency and an audio collection parameter of the feedback microphone; performing a power spectrum analysis on the feedback audio signal to obtain a power spectrum of the feedback audio signal; determining target power information of the target frequency from the power spectrum; and in response to the target power information being not less than a maximum power threshold value set for the target frequency, determining that the wearing state is in-ear state.