ANC Audio Playback Feedback Control for Low-Frequency Distortion
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Solution Overview
Problem
Existing audio playback devices face issues with distortion and noise due to excessive digital gain compensation in active noise cancellation modes, particularly when ambient sound pressure is high, leading to overload distortion noise.
Innovation Solution
An audio data processing method that dynamically adjusts feedback noise-reduction parameters based on characteristic analysis of ambient and audio signals in active noise cancellation mode, using preset-frequency-band signal analysis and threshold comparisons to optimize noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital gain compensation is increased to compensate for audio loss in active noise cancellation mode, then noise reduction effectiveness is improved, but distortion and noise are easily generated
Solution Approach 1:
The patent implements dynamic adjustment of feedback noise-reduction parameters based on real-time analysis of ambient sound characteristics and music signal characteristics. Instead of using fixed digital gain compensation, the system continuously adapts the noise reduction degree according to environmental conditions, thereby maintaining effective noise cancellation while avoiding excessive gain that causes distortion and noise.
Solution Approach 2:
The patent changes the parameter of feedback noise-reduction gain from a fixed value to a dynamically adjustable parameter. By analyzing the low-frequency band characteristics of ambient sound and music signals, the system adjusts the feedback noise-reduction parameter in real-time, optimizing the balance between noise reduction effectiveness and audio quality to prevent distortion and noise generation.
2Reliability
If feedback noise-reduction parameter is increased to reduce ambient noise, then noise cancellation performance is improved, but audio quality deteriorates due to overload distortion
Solution Approach 1:
The patent employs a feedback mechanism where the system continuously monitors ambient sound characteristics and music signal characteristics, then adjusts the feedback noise-reduction parameter accordingly. This closed-loop control ensures that noise cancellation performance is optimized without exceeding the threshold that would cause overload distortion, thereby maintaining audio quality.
Solution Approach 2:
The system dynamically adjusts the feedback noise-reduction parameter based on real-time environmental conditions and music characteristics. By making the parameter adaptive rather than fixed, the system can maintain high noise cancellation performance in noisy environments while preventing audio quality deterioration when ambient noise levels are lower or music signals are sensitive.
Data Source
AI summary
An audio data processing method, an electronic device, and a non-transitory computer-readable storage medium are provided. The method includes: obtaining a current audio-playback mode of the audio playback device; in response to the current audio playing mode being an active noise cancellation mode, obtaining an ambient sound, performing characteristic analysis on a preset-frequency-band signal generated from an ambient sound signal, and obtaining a first low-frequency-band (LFB) signal characteristic value corresponding to the ambient sound; performing characteristic analysis on a preset-frequency-band signal generated from an audio signal played by the audio playback device, and obtaining a second LFB signal characteristic value corresponding to the audio signal; and adjusting a feedback noise-reduction parameter of the audio playback device based on the second LFB signal characteristic value, in response to the first LFB signal characteristic value being greater than a first preset threshold value.