Audio Source Loudness Adaptation for Smooth Volume Switching
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Solution Overview
Problem
Abrupt changes in audio volume occur when switching between entertainment sources in audio systems, particularly in vehicles, leading to potential safety issues due to unexpected volume increases.
Innovation Solution
A control unit that detects source changes and adjusts the audio system's volume setting based on the loudness of the current and subsequent entertainment sources, preventing abrupt volume changes by measuring and adapting the LKFS value and volume settings to maintain a consistent output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the volume control of the audio system is set to a high level to compensate for low volume from external entertainment sources, then the music can be heard at normal volume, but abrupt volume changes occur when switching between entertainment sources
Solution Approach 1:
The control unit measures the loudness of the audio signal from the first entertainment source before a source switch occurs, and pre-adjusts the audio system's volume setting based on this measurement. This preliminary action ensures that when the second entertainment source is connected, the volume transition is smooth and prevents abrupt volume changes.
Solution Approach 2:
The control unit continuously monitors the loudness of the audio signal from the current entertainment source and uses this feedback information to automatically adjust the audio system's volume setting. This closed-loop feedback mechanism ensures that the output volume remains stable regardless of changes in the entertainment source's inherent loudness characteristics.
2Ease of operation
If the user manually adjusts the volume control to compensate for quiet music, then the music becomes audible, but the driver may be surprised by abrupt volume changes when switching sources
Solution Approach 1:
The control unit automatically performs the volume adjustment function that would otherwise require manual user intervention. By measuring the loudness of the audio signal and autonomously adapting the volume setting, the system eliminates the need for users to manually adjust volume controls, thereby preventing safety-critical situations while maintaining ease of use.
Solution Approach 2:
The manual mechanical volume control adjustment is replaced by an automated electronic control system. The control unit uses electronic measurement of audio signal loudness and electronic adjustment of the volume setting, substituting the mechanical user-adjustment process with an automated system that enhances safety.
3Adaptability or versatility
If the audio system accepts multiple external entertainment sources with different volume levels, then source versatility is improved, but volume inconsistency occurs when switching between sources
Solution Approach 1:
The control unit is designed to work with multiple different types of entertainment sources (smartphones, tablets, MP3 players, etc.) connected via Bluetooth or AUX input. It universally measures the loudness of audio signals from any connected source and automatically adapts the volume setting, making the audio system compatible with diverse sources while maintaining consistent output volume.
Solution Approach 2:
The control unit dynamically changes the volume parameter of the audio system based on the measured loudness parameter of the audio signal from the connected entertainment source. By continuously monitoring and adjusting the volume parameter in response to changes in the entertainment source's loudness characteristics, the system maintains consistent output despite source variations.
Data Source
AI summary
A device for adapting the volume of an audio signal in an audio system includes a control unit that determines the loudness of a first audio signal of a first entertainment source or the volume setting of a controller of the audio system, and adapts the volume setting of the controller of the audio system on the basis of the loudness of the first audio signal or the volume setting of the controller, or emits a signal in order to indicate to a user a change between the loudness of the first audio signal of the first entertainment source or the volume setting of the controller of the audio system and a respective specified threshold.