Stereo Audio Channel Balancing for Comfortable Headphone Listening
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Solution Overview
Problem
Stereo audio signals with extreme channel level differences, when rendered through headphones, can create an unnatural and uncomfortable listening experience due to high inter-aural level differences.
Innovation Solution
An apparatus and method that analyze level differences between stereo audio channels, and if they exceed a threshold, adaptively move signal energy from the louder channel to the quieter one to reduce these differences, maintaining spatial cues while enhancing comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If signal energy is moved from the louder channel to the quieter channel to reduce level differences, then listening comfort is improved, but spatial audio cues may be compromised
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the balance between level difference reduction and spatial cue preservation based on the detected inter-aural level difference magnitude. When the level difference exceeds a threshold, the system modifies the audio signal parameters to reduce the imbalance, but controls the degree of modification to maintain essential spatial information. This resolves the contradiction by adapting the processing intensity to the specific audio content characteristics.
2Ease of operation
If adaptive processing is applied to reduce channel level differences, then listening comfort is improved, but processing complexity increases
Solution Approach 1:
The system implements self-service by automatically detecting inter-aural level differences and applying appropriate processing without requiring user intervention or complex configuration. The apparatus monitors the audio signal characteristics and autonomously adjusts the balance processing, reducing the need for complex external control systems while maintaining listening comfort. This resolves the contradiction by making the system self-regulating rather than requiring complex external management.
Data Source
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AI summary
An apparatus comprising means for: analyzing a level difference between a left channel and a right channel of a stereo audio signal; determining if the level difference between the left channel and the right channel is above a threshold; conditionally, if the determined level difference is above the threshold, moving signal energy from a louder one of the left channel and the right channel to the other of the left channel and the right channel to create a processed left channel and a processed right channel of a processed stereo audio signal.