Wind Detection in Earbuds Audio Processing
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Solution Overview
Problem
Wireless earbuds face challenges in maintaining audio quality due to environmental noise, particularly wind, which affects active-noise-control, passthrough, and sidetone modes by introducing incoherent noise signals that hinder effective noise cancellation and user experience.
Innovation Solution
The earbuds employ a wind-detection system using two outer microphones to calculate wind levels by computing differences and sums of audio signals, applying filters, and adjusting mode parameters such as gain to attenuate or disable noisy modes during windy conditions, then restore them when wind subsides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active-noise-control mode is used to cancel environmental noise, then noise cancellation performance is improved, but wind noise interferes with the effectiveness of noise cancellation
Solution Approach 1:
The system performs preliminary wind detection by analyzing audio signals from outer microphones before noise cancellation is applied. By detecting wind conditions in advance and adjusting parameters proactively, the system prevents wind noise from degrading noise cancellation performance, resolving the contradiction between maintaining reliable noise cancellation and dealing with wind interference.
Solution Approach 2:
The system dynamically adjusts noise cancellation parameters based on real-time wind detection. When wind is detected, the system modifies the noise cancellation algorithm's behavior (such as adjusting reference signal weighting or cancellation depth), allowing the noise cancellation performance to adapt to windy conditions and maintain effectiveness despite wind interference.
2Ease of operation
If passthrough mode is used to allow environmental noise into audio output, then user awareness of environment is improved, but wind noise degrades audio quality
Solution Approach 1:
The system applies different processing to different audio components in passthrough mode. It selectively attenuates wind noise frequencies while preserving other environmental sounds, allowing users to maintain awareness of their environment while filtering out the harmful wind noise component. This local quality adjustment resolves the contradiction between environmental awareness and audio quality.
3Reliability
If sidetone mode is used to provide user voice feedback, then communication effectiveness is improved, but wind noise hinders effective communication
Solution Approach 1:
The system uses feedback from wind detection to dynamically adjust sidetone parameters. When wind is detected, the system modifies the sidetone mix or applies additional noise suppression specifically to the sidetone path, ensuring that communication effectiveness is maintained despite wind noise interference. The feedback loop continuously monitors wind conditions and adjusts communication parameters accordingly.
Data Source
AI summary
This disclosure describes, in part, techniques to process audio signals to lessen the impact that wind and/or other environmental noise has upon the resulting quality of audio signals output on speaker(s) of wireless earbuds or other headphones. For example, the techniques may determine a level of wind and/or other noise in an environment and may determine how best to process the signals to lessen the impact of the noise, such that one or more users that hear audio based on output of the signals hear higher-quality audio. In some instances, the techniques are able to detect levels of wind in a relatively low-power manner and as part of regular operation of the wireless earbuds or other headphones.