Air-Bone Noise Reduction via Adaptive Gain Control
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Solution Overview
Problem
Conventional dual-microphone noise reduction methods using bone conduction and air conduction microphones often result in a noticeable switching effect, causing hearing discomfort due to the direct compensation of low-frequency air conduction signals, which is not effective in low signal-to-noise ratios and can distort voice or leave noise residues.
Innovation Solution
A method that calculates a priori signal-to-noise ratio of air-bone integration by integrating air conduction and bone conduction parameters, then uses this ratio to determine a noise reduction gain for adaptive noise reduction, effectively reducing noise while minimizing the switching effect and improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bone conduction low-frequency part is used to directly compensate for air conduction microphone signal, then noise reduction effect is improved, but switching effect occurs causing hearing discomfort
Solution Approach 1:
The patent applies dynamics by making the compensation method adaptive rather than fixed. The system dynamically switches between different compensation strategies based on signal-to-noise ratio conditions, using bone conduction compensation only when SNR is below a threshold, and air conduction processing when SNR is sufficient, thereby eliminating the noticeable switching effect while maintaining noise reduction effectiveness
Solution Approach 2:
The patent changes the parameter of signal-to-noise ratio threshold to control the compensation strategy. By monitoring the SNR parameter and adjusting the compensation method based on whether it exceeds a predetermined threshold, the system optimizes both noise reduction performance and naturalness of the output signal, avoiding the harsh switching effect
2Reliability
If conventional dual-microphone noise reduction method is used, then noise reduction capability is improved, but voice distortion occurs in low signal-to-noise ratio conditions
Solution Approach 1:
The patent uses parameter changes by adjusting the signal-to-noise ratio threshold to control when bone conduction compensation is applied. When the SNR is below the threshold, bone conduction compensation is activated to prevent voice distortion; when SNR is sufficient, the system uses conventional air conduction processing, thereby maintaining voice quality across different noise conditions
Solution Approach 2:
The patent introduces bone conduction signal as an intermediary to mediate between noisy air conduction signals and the final output. The bone conduction signal serves as a clean reference that helps reconstruct the speech signal in low SNR conditions without causing the distortion that occurs with direct air conduction processing
Data Source
AI summary
A method for reducing noise includes: obtaining a priori signal-to-noise ratio of air-bone integration, the priori signal-to-noise ratio of air-bone integration being obtained by integrating air conduction parameters of the current frame, bone conduction parameters of the current frame and air conduction noise parameters of the current frame; calculating a noise reduction gain according to the priori signal-to-noise ratio of air-bone integration; and performing noise reduction operation according to the noise reduction gain and the air conduction parameters of the current frame.