Noise-Reduction Earphone Audio Processing for Ear-Blocking Relief
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Solution Overview
Problem
Existing noise-reduction earphones use a single mode for noise cancellation, which can cause discomfort in quiet environments and fail to account for individual user differences in sound sensitivity, leading to unsatisfactory noise-reduction effects.
Innovation Solution
The method involves using a feedback microphone to determine a transfer function, combining it with a feedforward microphone to build a filtered sound signal, and performing ear blocking elimination to obtain a target sound signal, while incorporating modules for wind and ear blocking noise reduction to enhance noise cancellation without increasing low-frequency gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active noise-reduction is performed using a single mode to offset low-frequency noise, then noise reduction effectiveness is improved, but user comfort deteriorates in quiet environments due to negative pressure sensation
Solution Approach 1:
The patent implements dynamic switching between different noise-reduction modes (first mode for quiet environments, second mode for noisy environments) based on ambient noise detection. This allows the system to adapt its noise cancellation strategy in real-time, providing effective noise reduction when needed while maintaining user comfort in quiet conditions by using a mode that does not create negative pressure sensation.
2Device complexity
If a single noise-reduction mode is used for all users, then device complexity is reduced, but adaptability to individual user characteristics deteriorates
Solution Approach 1:
The patent applies local quality by providing different noise-reduction processing characteristics for different frequency bands and different user ears (left and right). The system can apply different transfer functions and filtering parameters tailored to each user's specific sound sensitivity characteristics, allowing customization without requiring complete system redesign for each user.
Solution Approach 2:
The patent utilizes parameter changes by adjusting transfer function parameters, filtering characteristics, and noise-reduction intensity based on detected user characteristics and ambient conditions. The system can modify spectral parameters, gain values, and processing intensity dynamically to adapt to different users' sound sensitivity while maintaining a single device architecture.
3Reliability
If low-frequency gain is increased to improve noise reduction, then noise cancellation effectiveness is improved, but wind noise amplification worsens
Solution Approach 1:
The patent segments the noise-reduction processing into different frequency bands and applies different processing strategies to each band. By separating low-frequency noise cancellation from other frequency processing, the system can target low-frequency offset without uniformly amplifying all frequencies, thereby reducing wind noise amplification while maintaining noise cancellation effectiveness in the low-frequency range.
Data Source
AI summary
Disclosed are an audio processing method for a noise-reduction earphone, a noise-reduction earphone, a device and a readable storage medium. The audio processing method for a noise-reduction earphone includes: obtaining a first sound signal collected by a feedback microphone, and determining a first transfer function corresponding to the first sound signal; obtaining a second sound signal collected by a feedforward microphone, and building a filtered sound signal according to the first transfer function and the second sound signal; and determining an eustachian tube sound signal corresponding to the filtered sound signal, performing ear blocking elimination processing on the eustachian tube sound signal to obtain a target sound signal, and outputting the target sound signal.