Spatial Audio Signal Adaptation for Loudspeaker Setup Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern audio playback systems face compatibility issues due to varying loudspeaker setups, leading to compromised spatial audio experiences as they often deviate from the original intended configuration, lacking flexibility to maintain the original sound scene's spatial image.
Innovation Solution
An apparatus and method that group loudspeaker channels into segments, decompose them into direct and ambience components, and adjust these components to match the new playback setup, ensuring the perceived direction and envelopment remain consistent with the original setup, even with changes in the number of loudspeakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the audio signal is adapted to a different loudspeaker setup, then compatibility and flexibility are improved, but the original spatial image and audio quality are compromised
Solution Approach 1:
The audio signal is segmented into multiple frequency bands using filter banks, and each band is processed independently to preserve spatial information while adapting to different loudspeaker configurations. This allows the system to maintain spatial accuracy across multiple frequency ranges simultaneously.
Solution Approach 2:
Different processing strategies are applied to different frequency bands based on their specific characteristics. Direct sound components and ambience components are separated and processed with locally optimized transfer functions that match the playback loudspeaker setup, ensuring high spatial accuracy for each frequency region.
2Ease of operation
If the loudspeaker positioning deviates from the recommended setup, then flexibility in setup is improved, but the spatial quality and audio experience are degraded
Solution Approach 1:
The system dynamically adjusts transfer function parameters based on the actual playback loudspeaker configuration. By measuring or detecting the loudspeaker positions and adapting the transfer functions accordingly, the system maintains reliable spatial audio quality regardless of setup variations, allowing flexible positioning without quality degradation.
3Adaptability or versatility
If a complex sound scene with multiple direct sources is processed, then the ability to handle realistic audio scenes is improved, but the processing complexity increases
Solution Approach 1:
The complex sound scene is segmented into multiple frequency bands, and within each band, direct sound components from different sources are separated using blind source separation techniques. This segmentation approach reduces the computational complexity of handling multiple sources by processing them in parallel across frequency bands rather than simultaneously in the time domain.
Solution Approach 2:
Direct sound components are extracted from the mixed audio signal in each frequency band using correlation-based methods. By extracting and processing only the direct sound portions separately from the ambience, the system efficiently handles complex scenes with multiple sources without processing the entire signal with full complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Apparatus (100) for adapting a spatial audio signal (2) for an original loudspeaker setup to a playback loudspeaker setup that differs from the original loudspeaker setup. The apparatus comprises a direct-ambience decomposer (130) that is configured to decomposing channel signals in a segment of the original loudspeaker setup into direct sound (D) and ambience components (A), and to determine a direction of arrival of the direct sound components. A direct sound renderer (150) receives a playback loudspeaker setup information and adjusts the direct sound components (D) using the playback loudspeaker setup information so that a perceived direction of arrival of the direct sound components in the playback loudspeaker setup is substantially identical to the direction of arrival of the direct sound components. A combiner (180) combines adjusted direct sound components and possibly modified ambience components to obtain loudspeaker signals for loudspeakers of the playback loudspeaker setup.