Earphone Transparency Mode Wind Noise Cancellation
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Solution Overview
Problem
Wind noise interference occurs when using transparency mode in earphones, leading to a poor user experience in windy environments due to feedforward microphones picking up excessive wind noise.
Innovation Solution
The earphone design incorporates a feedback microphone and filters, where the feedback microphone picks up both external and speaker sounds, and a fixed filter inverts the speaker's source signal to cancel echoes, allowing only ambient sound to be amplified through a transparency filter, while an adaptive filter adjusts to optimize echo cancellation based on signal correlation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a feedforward microphone is used to collect external sounds for transparency mode, then the user can hear ambient sounds clearly, but wind noise is picked up excessively in windy scenes
Solution Approach 1:
The patent extracts the harmful wind noise component from the collected sound signal by using a feedback microphone positioned inside the earphone shell that does not pick up wind noise, separating it from the useful ambient sound signal for targeted cancellation
Solution Approach 2:
The patent implements a feedback mechanism where the feedback microphone continuously monitors the sound inside the earphone shell, and the processed feedback signal is used to cancel out wind noise and echo in real-time through adaptive filtering and signal inversion
2Reliability
If the feedback microphone picks up both external and speaker sounds, then echo cancellation can be achieved, but the system complexity increases with multiple filters
Solution Approach 1:
The patent segments the echo cancellation process into distinct functional modules: a fixed filter for initial echo cancellation, an adaptive filter for dynamic adjustment, and a transparency filter for ambient sound enhancement, allowing each component to be optimized independently
Solution Approach 2:
The patent applies preliminary echo cancellation through the fixed filter before the adaptive filter processes the signal, performing initial noise reduction in advance to reduce the processing burden on subsequent stages and improve overall system efficiency
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 solution effectively reduces wind noise interference, maintaining a clear transparency mode effect and preventing music quality changes or howling issues, even in windy conditions.
Implementation Method 1
a feedback microphone provided inside the earphone shell... the feedback microphone picks up both external and speaker sounds
Implementation Method 2
a fixed filter inverts the speaker's source signal to cancel echoes
Implementation Method 3
allowing only ambient sound to be amplified through a transparency filter
Data Source
AI summary
Disclosed are an earphone and an earphone control method. The earphone includes a shell, a speaker, a feedback microphone, a transparency filter and a fixed filter. The shell is provided with a sound chamber. The speaker is provided in the sound chamber. The feedback microphone is provided in the sound chamber. The transparency filter is provided in the shell, an input end of the transparency filter is connected to an output end of the feedback microphone, and an output end of the transparency filter is connected to an input end of the speaker. The fixed filter is provided in the shell, an input end of the fixed filter is connected to the input end of the speaker, and an output end of the fixed filter is connected to the input of the transparency filter.