Distributed TWS Microphone Array for Noisy Video Recording
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Solution Overview
Problem
True wireless stereo (TWS) headsets struggle to effectively suppress ambient noise and enhance target sound in noisy environments due to limited microphone quantity and user posture limitations, leading to poor sound quality in recorded videos.
Innovation Solution
A sound collecting method utilizing a first electronic device connected to left- and right-ear wireless earphones, forming a larger microphone array that performs noise reduction processing based on microphone relative locations and delay alignment to enhance target sound and suppress ambient noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a TWS headset uses a limited number of microphones for sound collection, then the device complexity is reduced, but the spatial resolution capability deteriorates, resulting in poor noise suppression performance
Solution Approach 1:
The patent combines microphones from both earphones with the smartphone microphone to form a unified microphone array system. This merging of multiple distributed microphones creates a virtual larger aperture array that enhances spatial resolution without requiring all microphones to be housed in a single device, thus maintaining device simplicity while achieving superior noise suppression capability.
2Volume of moving object
If a TWS headset uses a compact microphone array, then the device size is reduced, but the near field area coverage deteriorates, limiting accurate target sound distinction
Solution Approach 1:
The patent transitions from a two-dimensional planar microphone arrangement to a three-dimensional spatial distribution by utilizing microphones positioned on both earphones worn on the user's head. This dimensional expansion creates a spherical or volumetric microphone array that significantly enlarges the near field coverage area, enabling accurate distinction of target sounds from various directions while maintaining compact individual earphone sizes.
3Device complexity
If sound collection relies solely on the TWS headset microphones, then the system simplicity is maintained, but the noise suppression performance deteriorates due to user posture limitations
Solution Approach 1:
The patent introduces the smartphone as an intermediary device that receives audio signals from both earphones, performs centralized beamforming and noise suppression processing, and returns processed audio. This intermediary processing system overcomes the limitations of simple earphone-only configurations by providing sophisticated algorithms that adapt to user posture variations, thereby enhancing noise suppression reliability while maintaining relatively simple earphone hardware.
Data Source
AI summary
A sound collecting system includes a first electronic device, a left-ear TWS earphone, and a right-ear TWS earphone. Microphones of the first electronic device, the left-ear TWS earphone, and the right-ear TWS earphone form a first microphone array. When the first electronic device detects a user operation of starting video recording, the first microphone array performs sound collecting to obtain a joint microphone array signal. The first electronic device performs noise reduction processing on the joint microphone array signal.