Audio Signal Loudness Compensation Under Environmental Noise
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Solution Overview
Problem
Audio signal loudness is adversely affected by environmental noise, leading to decreased perceived audio quality in noisy environments, as existing acoustic optimization methods are insufficient in improving audio playback device performance.
Innovation Solution
A method and device that adjust audio signals by calculating and modifying loudness difference values using target factors obtained from test noise and audio signals, applying psychoacoustic masking models and linear interpolation, to compensate for noise interference and enhance audio quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If acoustic optimization methods are applied to audio systems, then audio quality is improved in good acoustic environments, but performance deteriorates in poor acoustic environments with noise
Solution Approach 1:
The patent implements dynamic noise compensation by continuously monitoring environmental noise levels and adjusting audio signal parameters in real-time. The system calculates noise spectra, determines compensation amounts based on the difference between target and actual noise levels, and applies adaptive filtering to maintain audio quality across varying acoustic conditions.
Solution Approach 2:
The patent changes audio signal parameters dynamically based on noise conditions. It adjusts equalization curves, gain levels, and frequency response characteristics according to measured noise spectra, transforming the audio output parameters to compensate for environmental noise and maintain consistent perceived quality.
2Manufacturing precision
If noise compensation is applied to audio signals, then perceived loudness is improved in noisy environments, but overcompensation may occur without proper control
Solution Approach 1:
The patent implements feedback control by continuously monitoring actual noise levels, comparing them against target noise levels, and adjusting compensation amounts accordingly. The system calculates the difference between target and actual noise spectra and uses this feedback to determine the appropriate compensation level, preventing overcompensation.
Solution Approach 2:
The patent applies partial compensation rather than full compensation by calculating compensation amounts as a controlled portion of the noise difference. It uses attenuation factors and weighted combinations of noise spectra to apply just enough compensation to improve perceived quality without overcorrecting the audio signal.
Data Source
AI summary
A method and a device for adjusting an audio signal, and an audio system are provided. The method includes: obtaining a candidate audio signal (S1); obtaining a current noise signal in an environment (S2); calculating a first plurality of difference values in loudness between the candidate audio signal and the current noise signal (S3); modifying the first plurality of difference values with a plurality of target factors, where the plurality of target factors are obtained based on a plurality of test noise signals and a corresponding plurality of test audio signals (S4); and modifying the candidate audio signal with the modified first plurality of difference values to obtain a target audio signal (S5). Therefore, loudness loss of the audio signal perceived due to the noise signal can be compensated, and an overcompensation issue can be solved.