Conference Bridge 3D Audio Rendering Complexity
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Solution Overview
Problem
Conventional conference bridge systems face high computational complexity in central rendering, particularly when handling multiple participants, due to the need for individual 3D positional audio environments and encoding of stereo signals for each participant, which grows exponentially with the number of participants.
Innovation Solution
The conference bridge places virtual sound sources at the same spatial position relative the listening participant in all 3D positional audio environments, rendering individual audio environments only for speaking participants and a common environment for non-speaking participants, reducing the number of required encoders and computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual 3D positional audio environments are created for each participant, then spatial audio quality is improved, but computational complexity increases exponentially with the number of participants
Solution Approach 1:
The patent segments participants into two categories: speaking participants and non-speaking participants. Individual 3D positional audio environments are created only for speaking participants, while a common environment is used for non-speaking participants. This segmentation reduces the number of individual environments needed from N (total participants) to K (speaking participants), where K << N, thereby reducing computational complexity while maintaining audio quality for active speakers.
Solution Approach 2:
The patent applies different quality levels to different participants based on their activity state. Speaking participants receive high-quality individual 3D positional audio environments with precise spatial positioning, while non-speaking participants are rendered in a common environment with lower processing resources allocated. This local quality differentiation maintains critical audio quality for active speakers while reducing overall computational burden.
2Manufacturing precision
If 3D positional audio rendering is performed for all participants, then spatial distribution is improved, but the number of encoders required increases with the number of participants
Solution Approach 1:
The patent merges the rendering of non-speaking participants into a single common 3D positional audio environment, rather than creating separate environments for each. This merging reduces the number of encoders required from N (one per participant) to 1 (for the common environment) plus K (for speaking participants), significantly reducing the total number of encoders needed while maintaining spatial distribution for active speakers.
3Manufacturing precision
If virtual sound sources are positioned differently for each participant, then spatial realism is improved, but processing time increases
Solution Approach 1:
The patent segments the processing of virtual sound source positioning into two paths: individual positioning for speaking participants (maintaining spatial realism) and common positioning for non-speaking participants (reducing processing time). This segmentation allows the system to maintain spatial realism where it matters most (for active speakers) while minimizing processing time through the common environment approach.
Data Source
AI summary
Conference bridge (1) for managing an audio scene comprising two or more participants, the conference bridge comprising a mixer (2) and several user channels (3a, 3b, 3N). The conference bridge is arranged to continuously create a 3D positional audio environment signal for each participant as a listening participant, by rendering the speech of each participant as a 3D positioned virtual sound source and excluding the speech of the listening participant, and to distribute each created 3D positional audio environment signal to the corresponding listening participant. Further, the conference bridge is arranged to place the virtual sound source corresponding to each participant at the same spatial position relative the listening participant in every created 3D positional audio environment.