Audio Signal Processing Noise Suppression Gain Adjustment
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Solution Overview
Problem
In audio signal processing, changes in gain applied by a variable gain component can cause noticeable changes in the noise level of a noise reduced signal, affecting user experience.
Innovation Solution
The noise suppression component is configured to rapidly adjust its aggressiveness in response to changes in the applied gain, matching the change amount and then gradually returning to its original level, thereby decoupling the desired audio and noise component level changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the gain is adjusted rapidly to change the audio signal level, then the response time is improved, but the noise level changes noticeably which degrades perceptual quality
Solution Approach 1:
The noise suppression aggressiveness is dynamically adjusted in response to gain changes. When gain changes rapidly, the noise suppression aggressiveness is increased temporarily to counteract the noise level changes caused by the gain adjustment, then gradually returned to its original level. This dynamic adjustment resolves the contradiction by making the noise suppression adaptive to the current operating conditions.
Solution Approach 2:
The system changes the parameter of noise suppression aggressiveness in response to gain changes. By modifying this parameter temporarily when gain is adjusted and then gradually returning it to its original value, the system compensates for the noise level changes that would otherwise be caused by rapid gain adjustments, thus maintaining perceptual quality.
2Object-affected harmful factors
If the noise suppression aggressiveness is increased to reduce noise level changes, then the perceptual quality is improved, but the desired audio component may be affected
Solution Approach 1:
The increased noise suppression aggressiveness is applied periodically and temporarily only when needed (during and immediately after gain changes), then gradually returned to the original level. This periodic application ensures that noise level changes are counteracted when necessary while minimizing the impact on the desired audio component by not maintaining high aggressiveness continuously.
Solution Approach 2:
The noise suppression aggressiveness is dynamically adjusted based on the timing and magnitude of gain changes. By increasing aggressiveness temporarily during gain transitions and then gradually returning to the original level, the system achieves effective noise control during critical moments while preserving the desired audio component during normal operation.
3Object-affected harmful factors
If the gain adjustment is made gradual to maintain perceptual quality, then the noise level changes are reduced, but the response time increases
Solution Approach 1:
The system dynamically adjusts the noise suppression aggressiveness in response to rapid gain changes, allowing the gain to be adjusted quickly while compensating for the noise level changes that would otherwise occur. This dynamic compensation enables rapid gain adjustment without sacrificing perceptual quality.
Solution Approach 2:
The noise suppression aggressiveness adjustment acts as an intermediary mechanism that compensates for the effects of rapid gain changes. By temporarily increasing the aggressiveness during gain transitions, it mediates between the rapid gain adjustment and the noise level, allowing fast response while maintaining perceptual quality.
Data Source
AI summary
Disclosed is an audio signal processing device comprising an input for receiving a noisy audio signal, a variable gain component and a noise suppression component. The noisy audio signal has a desired audio component and a noise component. The variable gain component and the noise suppression component are respectively configured to apply a gain and a noise suppression procedure to the audio signal, thereby generating a gain adjusted noise reduced audio signal. The aggressiveness of the noise suppression procedure is rapidly changed responsive to a change in the applied gain. That change is a change from a current value by an amount substantially matching the change in applied gain to a new value. The aggressiveness is then gradually returned to the current value.