Earphone Wearing State Detection via Transfer Function Analysis
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Solution Overview
Problem
Existing methods for detecting the wearing state of earphones are either dependent on specific signal requirements or have poor anti-noise performance, failing to accurately determine the coupling between the earphone and ear canal, which affects sound quality.
Innovation Solution
A method and device that utilize a transfer function between a loudspeaker and a prepositive microphone to detect the wearing state of an earphone, allowing for audio compensation and improving anti-noise performance by estimating a filter coefficient based on the transfer function, making the earphone adaptable to different sound sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods use amplitude of infrasonic signal or difference value between weighted sums to detect wearing state, then detection can be performed, but the methods have poor anti-noise performance and require specific signal requirements
Solution Approach 1:
The patent uses the feedback audio signal collected by the prepositive microphone (which captures the audio signal played by the loudspeaker) to calculate the transfer function. This feedback mechanism allows the system to adapt to different audio sources and improve anti-noise performance by continuously monitoring and adjusting based on the actual acoustic environment.
Solution Approach 2:
The patent changes the detection parameter from simple amplitude or difference value to transfer function parameters (magnitude and phase). This parameter transformation enables the system to achieve better anti-noise performance while maintaining adaptability to different audio sources, as the transfer function captures the complete frequency response characteristics.
2Ease of operation
If an earphone is worn loosely, then comfort is improved, but coupling between the earphone and ear canal is poor causing low frequency leakage and degraded sound effect
Solution Approach 1:
The system automatically detects the wearing state through transfer function analysis and performs self-adjustment by compensating the audio signal. This self-service mechanism allows the earphone to maintain good sound quality regardless of whether it is worn loosely or tightly, as the system adapts to the actual coupling condition without requiring manual adjustment.
Solution Approach 2:
The patent implements dynamic detection and compensation of wearing state. The transfer function is continuously monitored and the audio signal is dynamically compensated based on the detected wearing condition. This dynamic approach allows the system to adapt to changing wearing states and maintain optimal sound quality throughout use.
3Manufacturing precision
If an earphone is worn tightly, then coupling between the earphone and ear canal is good maintaining low frequency, but comfort is reduced
Solution Approach 1:
The system automatically detects the wearing state through transfer function analysis and performs self-adjustment by compensating the audio signal. This self-service mechanism allows the earphone to maintain good sound quality regardless of whether it is worn loosely or tightly, as the system adapts to the actual coupling condition without requiring manual adjustment.
Solution Approach 2:
The patent implements dynamic detection and compensation of wearing state. The transfer function is continuously monitored and the audio signal is dynamically compensated based on the detected wearing condition. This dynamic approach allows the system to adapt to changing wearing states and maintain optimal sound quality throughout use.
4Manufacturing precision
If manufacturers focus on earphone quality, then sound effect is improved, but influence of wearing states is ignored leading to inconsistent performance
Solution Approach 1:
The patent uses the feedback audio signal collected by the prepositive microphone to calculate the transfer function, creating a closed-loop system that monitors actual performance. This feedback mechanism ensures consistent performance across different wearing conditions by automatically detecting and compensating for variations caused by different wearing states.
Solution Approach 2:
The patent changes from static quality assurance to dynamic parameter monitoring and adjustment. By continuously analyzing transfer function parameters and adjusting audio compensation in real-time, the system maintains consistent performance regardless of wearing state variations, supplementing manufacturing quality with operational adaptability.
Data Source
AI summary
A method and device for detecting a wearing state of an earphone and an earphone are disclosed. The method includes that: a source audio signal input into a loudspeaker of an earphone and a feedback audio signal collected by a prepositive microphone are acquired; a transfer function between the source audio signal and the feedback audio signal is acquired according to the source audio signal and the feedback audio signal; and a wearing state of the earphone is acquired according to the transfer function, and audio compensation processing is performed on the source audio signal according to the wearing state.