Multichannel Spatial Audio Decoding With Adaptive VBAP Triangulation
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Solution Overview
Problem
Current vector base amplitude panning (VBAP) methods for spatial sound reproduction in multichannel loudspeaker systems face challenges in accurately reproducing auditory objects, particularly due to differences in horizontal and vertical panning, which result in reduced audio quality and localization issues, especially when loudspeakers are not equally distributed and when panning occurs in the vertical axis.
Innovation Solution
The proposed solution involves an adaptive triangulation scheme for VBAP that avoids triangles crossing the horizontal plane, optimizing loudspeaker setups to improve audio quality by selecting triangulation methods based on content and spatial metadata, ensuring that auditory objects are accurately positioned and rendered without intersecting planes, thereby enhancing perceptual spatial accuracy and reducing comb filtering effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional VBAP triangulation is used, then spatial sound reproduction is achieved, but audio quality and localization accuracy deteriorate when triangles cross the horizontal plane
Solution Approach 1:
The patent applies local quality by treating horizontal and vertical panning differently through adaptive triangulation. When the auditory object is near the horizontal plane, the system selects triangulation methods that avoid crossing the horizontal plane, thereby locally optimizing the reproduction quality for that specific spatial region and reducing comb filtering effects.
Solution Approach 2:
The patent implements dynamics by making the triangulation method adaptive rather than static. The system dynamically selects between different triangulation approaches (such as avoiding horizontal plane crossings or using conventional methods) based on the real-time position of the auditory object and the specific panning scenario, thereby optimizing performance across varying conditions.
2Measurement precision
If adaptive triangulation avoiding horizontal plane crossings is used, then localization accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining a set of candidate triangulation methods with known characteristics (such as avoiding horizontal plane crossings). During runtime, the system only needs to select from these pre-prepared options based on simple criteria (like whether the auditory object is near the horizontal plane), rather than computing complex triangulations on the fly, thus reducing real-time computational complexity.
3Adaptability or versatility
If conventional VBAP is used with equally distributed loudspeakers, then horizontal panning works well, but vertical panning and uneven loudspeaker distributions result in reduced audio quality
Solution Approach 1:
The patent applies universality by creating a triangulation selection framework that works across multiple loudspeaker configurations (equally distributed, unevenly distributed, different numbers of loudspeakers). The adaptive triangulation method universally handles various scenarios by selecting appropriate triangulation strategies based on the specific configuration and auditory object position, rather than requiring configuration-specific optimizations.
Data Source
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AI summary
An apparatus for spatial audio signal decoding associated with a plurality of speaker nodes placed within a three dimensional space, the apparatus comprising at least one processor and at least one memory including a computer program code. The at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to determine a nonoverlapping virtual surface arrangement, the virtual surface arrangement comprising a plurality of virtual surfaces with corners positioned at at least three speaker nodes of the plurality of speaker nodes and sides connecting pairs of corners configured to be non-intersecting with at least one defined virtual plane within the three dimensional space. The apparatus is further caused to generate gains for the speaker nodes based on the determined the virtual surface arrangement and apply the gains to at least one audio signal, the at least one audio signal to be positioned within the three dimensional space.