Volume-Dependent Audio Compensation for Consistent Loudness
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Solution Overview
Problem
Existing audio compensation methods fail to accurately adjust audio playback to maintain consistent sound perception across varying playback sound pressure levels without prior knowledge of the audio signal, particularly in real-time scenarios.
Innovation Solution
A method and device that determine playback sound pressure levels based on pre-stored acoustic transfer data and generate compensation filters to apply gain factors, ensuring the audio stream's total power is preserved, using amplitude compensation data and equal loudness contours to adjust audio streams in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If audio signals are played at high volumes, then the audio output is more audible and effective, but the listening duration becomes limited due to ear fatigue and damage
Solution Approach 1:
The system dynamically adjusts audio parameters based on volume level. At higher volumes, it automatically reduces bass frequencies and adjusts equalization to compensate for the natural rolling off of high frequencies, thereby maintaining audio quality and reducing ear fatigue while extending safe listening duration
Solution Approach 2:
The invention changes audio frequency parameters dynamically based on volume level. It applies volume-dependent equalization that reduces low-frequency content at high volumes and compensates for high-frequency attenuation, optimizing the audio spectrum for each volume level to prevent ear damage while maintaining audibility
2Duration of action of moving object
If audio signals are played at low volumes, then ear fatigue and damage are reduced, but the audio output becomes less audible and less effective
Solution Approach 1:
The system applies volume-dependent equalization that adjusts frequency balance based on playback level. At lower volumes, it enhances bass frequencies and compensates for the relative prominence of high frequencies, ensuring audio remains effective and engaging without requiring high volume levels
3Measurement precision
If high fidelity audio equipment is used, then audio quality is improved, but the cost of the equipment increases
Solution Approach 1:
The invention achieves high fidelity audio quality through software-based volume-dependent equalization and frequency compensation algorithms. This digital signal processing approach provides professional-grade audio optimization without requiring expensive hardware modifications, making high-quality audio accessible through standard equipment
Solution Approach 2:
The system replaces complex mechanical audio optimization hardware with software-based digital signal processing. The volume-dependent equalization and frequency compensation are implemented through algorithms that analyze and adjust audio parameters in real-time, eliminating the need for expensive physical audio processing equipment
Data Source
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AI summary
Presented is a method (100) for real-time processing an audio stream in an audio speaker arrangement comprising at least one audio speaker. The method (100) comprises receiving (110) an audio-stream and a playback volume associated with the audio-stream and determining (120) a playback sound pressure level of the audio speaker based on the playback volume and pre-stored acoustic transfer data. The pre- stored acoustic transfer data is associating the playback volume with the playback sound pressure level of the audio speaker. The method further comprises generating (130) a compensation filter based on amplitude compensation data associated with the determined playback sound pressure level and filtering (140) the audio-stream using the compensation filter and applying a gain factor to the audio stream generating a compensated audio-stream. The gain factor is configured such that a total audio power of the audio stream is preserved regardless of the compensation filter. The compensated audio stream is provided (150) to the audio speaker (21). Additionally, an audio speaker arrangement and a computer program product are presented.