Adaptive Audio Loudness Control Under Changing Noise Conditions
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Solution Overview
Problem
Existing audio signal loudness control methods fail to dynamically adapt to changing noise environments, often resulting in unsatisfactory user experience as they maintain constant partial loudness, which does not align with user preferences under varying noise conditions.
Innovation Solution
A method and system that dynamically control the target partial loudness of an audio signal by considering factors related to the noise signal, the audio signal itself, and user preferences, using a combination of noise and audio type classifiers, level meters, and user input to derive a target partial loudness adjustment, which is then applied to maintain optimal perceived loudness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constant partial loudness is maintained in presence of noise signal, then audio loudness consistency is improved, but user satisfaction deteriorates under varying noise conditions
Solution Approach 1:
The patent implements dynamic target partial loudness adjustment by introducing a target partial loudness adjustment derivation unit that continuously adapts the target loudness level based on real-time noise signal characteristics and audio signal properties. Instead of maintaining a fixed target partial loudness, the system dynamically modifies the target value according to environmental conditions, thereby resolving the contradiction between stability and adaptability.
Solution Approach 2:
The system changes the parameter of target partial loudness from a constant value to a variable value that depends on noise signal level, audio signal characteristics, and user preferences. This parameter transformation allows the audio loudness control to adapt to varying noise conditions while maintaining operational stability through structured adjustment mechanisms.
2Object-affected harmful factors
If noise signal level increases, then background noise interference increases, but partial loudness of audio signal decreases
Solution Approach 1:
The patent employs feedback mechanisms by continuously monitoring the noise signal level and audio signal characteristics, then using this information to adjust the target partial loudness through the derivation unit. This closed-loop control ensures that as noise interference increases, the system responds by appropriately increasing the target loudness level to compensate for the masking effect, thereby maintaining audio signal clarity.
Solution Approach 2:
The system performs preliminary anti-action by proactively adjusting the target partial loudness before the audio signal becomes inaudible or unsatisfactory. The derivation unit anticipates the need for loudness compensation by detecting noise signal characteristics and pre-adjusting the target level, preventing the degradation of partial loudness rather than merely reacting to it.
Data Source
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AI summary
Example embodiments disclosed herein relate to audio signal loudness control. A method for controlling loudness of an audio signal is disclosed. The method includes responsive to determining presence of a noise signal, deriving a target partial loudness adjustment based, at least in part, on at least one of a first factor related to the noise signal and a second factor related to the audio signal. The method further includes determining a target partial loudness of the audio signal based, at least in part, on the target partial loudness adjustment. Corresponding system, apparatus and computer program product are also disclosed.