3D Audio Ray Tracing for Real-Time Sound Propagation
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Solution Overview
Problem
Current methods for simulating sound in three-dimensional environments are inefficient and unable to provide real-time sound effects due to the complexity of calculating sound wave propagation and interference in three-dimensional scenes.
Innovation Solution
The method involves generating sound events and using ray tracing to determine the resulting sound at a listener location by issuing rays into the scene, performing ray tracing, and modifying sounds based on intersections with objects, allowing for efficient and accurate real-time sound simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound wave propagation is calculated using traditional methods in three-dimensional scenes, then measurement precision of sound effects is improved, but device complexity and computational requirements increase significantly
Solution Approach 1:
The patent replaces the traditional mechanical/acoustic method of calculating sound wave propagation (solving differential equations) with an optical analogy method (ray tracing). By treating sound waves similarly to light rays and using established ray tracing algorithms, the system achieves accurate sound propagation simulation without the computational burden of solving complex acoustic differential equations in three-dimensional spaces.
2Measurement precision
If traditional sound propagation calculation methods are used, then sound effect accuracy is improved, but processing speed decreases making real-time effects impossible
Solution Approach 1:
The patent substitutes the computationally intensive acoustic wave equation solving with the faster-ray tracing method borrowed from computer graphics. This optical analogy allows the system to calculate sound propagation paths, reflections, and diffractions much more quickly, enabling real-time sound effects while maintaining reasonable accuracy.
Solution Approach 2:
The patent performs preliminary spatial indexing and scene preparation before sound calculation. By pre-processing the three-dimensional scene data into an optimized spatial structure, the system reduces the computational workload during actual sound propagation calculation, thereby improving processing speed for real-time applications.
3Measurement precision
If detailed sound wave calculations are performed, then sound effect realism is improved, but loss of time increases making real-time processing impossible
Solution Approach 1:
The patent replaces time-consuming acoustic simulations with the faster ray tracing technique. By using the optical analogy, the system can calculate sound propagation, including reflections and diffractions, in a fraction of the time required by traditional methods, thus achieving realistic sound effects in real-time.
Solution Approach 2:
The patent performs preliminary spatial indexing of the three-dimensional scene before sound calculation. This pre-processing step organizes scene data into an efficient spatial structure, significantly reducing the time required for subsequent sound propagation calculations and enabling real-time processing.
Data Source
AI summary
According to embodiments of the invention, a sound engine may determine a final sound at a listener location by emulating sound waves within a three-dimensional scene. The sound engine may emulate sound waves by issuing rays from a location of a sound event and tracing the rays through the three-dimensional scene. The rays may intersect objects within the three-dimensional scene which have sound modification factors. The sound modification factors and other factors (e.g., distance traveled by the ray, angle of intersection with the object, etc.) may be applied to the sound event to determine a final sound which is heard by the listener.