Audio Volume Normalization Using Metadata and Feedback Control
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Solution Overview
Problem
Conventional audio media systems struggle to maintain consistent volume levels across different sources and media, leading to noticeable and potentially irritating volume differences for listeners.
Innovation Solution
The use of media metadata to determine an average audio level for a unit of media, allowing for the application of a gain value to achieve a desired volume level, combined with real-time monitoring and dynamic adjustment to ensure volume consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional audio media systems play audio from multiple sources without volume normalization, then device complexity is reduced and ease of operation is improved, but volume consistency deteriorates causing noticeable volume differences
Solution Approach 1:
The system performs preliminary volume normalization by accessing metadata containing average volume information before audio playback. A gain value is calculated and applied in advance to adjust the audio signal to a target volume level, ensuring consistent volume across different media without requiring complex real-time adjustments during playback
Solution Approach 2:
Metadata serves as an intermediary carrier containing average volume information about the audio media. The system uses this metadata to determine the appropriate gain value to apply, acting as a mediator between the audio source and the playback system to achieve volume normalization without direct complex interaction between multiple audio sources
2Manufacturing precision
If dynamic range compression is used to adjust volume levels, then volume consistency is improved, but audio signal quality deteriorates due to degradation of perceived quality
Solution Approach 1:
Instead of using dynamic range compression that alters the audio signal's dynamic characteristics, the system changes the volume parameter by applying a calculated gain value to the entire audio signal. This approach adjusts the overall volume level while preserving the original dynamic range and perceived quality of the audio signal
3Manufacturing precision
If real-time monitoring and dynamic adjustment are implemented, then volume consistency is improved and rapid volume fluctuations are prevented, but device complexity increases
Solution Approach 1:
The system implements a feedback mechanism where a monitor continuously measures the output audio signal's volume level and compares it against the target volume level. When deviations are detected, the system dynamically adjusts the gain value to correct the volume, ensuring consistent volume levels while preventing rapid fluctuations between different media or sources
Data Source
AI summary
Apparatus, systems, articles of manufacture, and methods for volume adjustment are disclosed herein. An example method includes collecting data corresponding to a volume of an audio signal as the audio signal is output through a device, when an average volume of the audio signal does not satisfy a volume threshold for a specified timespan, determining a difference between the average volume and a desired volume, and applying a gain to the audio signal to adjust the volume of the audio signal to the desired volume, the gain determined based on the difference between the average volume and the desired volume.