Virtual Speaker Distribution Using HOA Correlation for 3D Audio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing three-dimensional audio technology, specifically Higher Order Ambisonics (HOA), is limited in its ability to distribute virtual speakers beyond a certain number, leading to constraints in achieving optimal sampling effects for audio signal playback.
Innovation Solution
A method and apparatus for determining a virtual speaker set by selecting virtual speakers based on a preset distribution table, utilizing HOA coefficients to maximize signal-to-noise ratios and correlations, allowing for optimal audio signal playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If virtual speakers are distributed on vertices of regular polyhedrons (e.g., regular tetrahedron), then the sampling effect is optimized, but the quantity of virtual speakers is limited to only five types
Solution Approach 1:
The patent divides the virtual speaker distribution into multiple levels: first determining a target virtual speaker from F preset virtual speakers based on HOA coefficient correlation, then determining S virtual speakers corresponding to the target virtual speaker from the remaining F-1 preset virtual speakers. This segmentation allows the system to overcome the limitation of regular polyhedron vertex distributions and achieve flexible distribution of large quantities of virtual speakers while maintaining optimal sampling effects.
Solution Approach 2:
The patent changes the selection criterion from fixed geometric positions (vertices of regular polyhedrons) to dynamic parameter-based selection (HOA coefficient correlation). By calculating correlation between HOA coefficients of preset virtual speakers and the audio signal, the system can adaptively select virtual speakers that best represent the sound field, enabling flexible distribution of any quantity of virtual speakers while optimizing sampling effectiveness.
2Ease of manufacture
If a fixed distribution pattern (regular polyhedrons) is used for virtual speakers, then the implementation is simple, but the adaptability to different audio signals is reduced
Solution Approach 1:
The patent introduces dynamic selection of virtual speakers based on the characteristics of the audio signal. Instead of using a fixed distribution pattern, the system calculates HOA coefficients for the audio signal and selects virtual speakers with highest correlation to these coefficients. This dynamic approach allows the virtual speaker distribution to adapt to different audio signals while maintaining implementation feasibility through automated calculation and selection processes.
Solution Approach 2:
The patent implements a feedback mechanism where the HOA coefficients of the audio signal are used to evaluate and select the most appropriate virtual speakers. The correlation between virtual speaker HOA coefficients and audio signal HOA coefficients serves as feedback to determine the optimal virtual speaker set, ensuring adaptability to different audio content while maintaining a systematic selection process.
Data Source
AI summary
This application provides a method and an apparatus for determining a virtual speaker set. The method for determining a virtual speaker set includes: determining a target virtual speaker from F preset virtual speakers based on a to-be-processed audio signal, where each of the F virtual speakers corresponds to S virtual speakers, F is a positive integer, and S is a positive integer greater than 1; and obtaining, from a preset virtual speaker distribution table, respective position information of S virtual speakers corresponding to the target virtual speaker, where the virtual speaker distribution table includes position information of K virtual speakers, the position information includes an elevation angle index and an azimuth angle index, K is a positive integer greater than 1, F≤K, and F×S≥K. This application can improve audio signal playback effect.