3D Sound Field Simulation Using Direct and Diffracted Components
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Solution Overview
Problem
Existing sound field simulation technologies face significant computational challenges when reproducing wide outdoor sound fields in virtual three-dimensional spaces, particularly in scenarios where sound sources are obstructed by obstacles, leading to an excessive amount of calculation.
Innovation Solution
An information processing apparatus adjusts sound pressure levels and propagation timings for direct and diffracted sound components based on representative frequency bands and obstacle materials, generating synthetic sound by combining these components in a virtual three-dimensional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound field simulation calculates volume and other parameters based on direct sound and diffracted sound for all sound data from the sound source, then acoustic realism is improved, but the amount of calculation becomes enormous
Solution Approach 1:
The patent segments sound data processing by dividing sound waves into direct sound components and diffracted sound components. The controller selectively applies detailed calculation (including diffraction) only to specific frequency bands where diffraction is significant, while using simplified processing for other frequency bands. This segmentation resolves the contradiction by maintaining acoustic realism for critical components while reducing overall computational load.
Solution Approach 2:
The patent changes the processing parameters based on frequency band characteristics. For frequency bands where diffraction is significant, the system calculates volume and other parameters based on both direct and diffracted sound. For other frequency bands, simplified processing is applied. This parameter-based differentiation maintains acoustic realism where needed while improving calculation efficiency across the entire sound field.
2Manufacturing precision
If the system processes all frequency bands with full diffraction calculation, then sound reproduction accuracy is improved, but computational complexity increases significantly
Solution Approach 1:
The patent segments the frequency spectrum into multiple bands and applies different processing complexities to each segment. Frequency bands where diffraction effects are significant receive full diffraction calculation, while other bands use simplified processing. This segmentation maintains sound reproduction accuracy for critical frequencies while reducing overall computational complexity.
Solution Approach 2:
The patent applies partial diffraction calculation only to the extent necessary for accurate sound reproduction. Instead of calculating diffraction for all frequency bands equally, the system identifies and processes only those bands where diffraction has significant impact on sound quality. This partial action approach maintains accuracy where needed while avoiding unnecessary computational complexity.
Data Source
AI summary
An information processing apparatus includes a controller, and the controller is configured to adjust a sound pressure level and a timing of reaching an observation point with respect to a first component that reaches, within a virtual three-dimensional space, the observation point from a sound source in a shortest distance based on a representative frequency band of the sound source and material of an obstacle through which the first component passes, adjust a sound pressure level and a timing of reaching the observation point with respect to a second component other than the first component based on the representative frequency band of the sound source, generate synthetic sound by combining, at a ratio in accordance with an attribute of the sound source and an attribute of the obstacle, the first component and the second component with respect to which respective adjustments are made, and simulate the generated synthetic sound.