CN-121980822-A - Acoustic simulation method and system based on low-frequency waveguide digital grid and geometric modeling

CN121980822ACN 121980822 ACN121980822 ACN 121980822ACN-121980822-A

Abstract

The invention discloses an acoustic simulation method and system based on low-frequency waveguide digital grids and geometric modeling, which relate to the technical field of acoustic simulation, and are used for importing a three-dimensional scene model formed by triangular patches, initializing sound source parameters and receiver positions, acquiring a plurality of sound field propagation paths through geometric acoustic pre-analysis based on the three-dimensional scene model, the sound source parameters and the receiver positions, and calculating initial perception importance parameters for each sound field propagation path. And distributing each sound field propagation path to a first calculation strategy or a second calculation strategy for processing according to the initial perception importance parameter. According to the invention, through geometric acoustic pre-analysis and real-time dynamic evaluation, a high-precision calculation strategy is only allocated to the key sound field propagation paths with high perception contribution, and a high-efficiency geometric method is adopted for a large number of secondary paths. The resource scheduling strategy based on auditory perception ensures that the computing resources are highly focused, and unnecessary consumption on secondary components is avoided.

Inventors

REN JUNJUN
LUO HAO
SUN YUNYUN

Assignees

杭州艾力特数字科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (10)

1. The acoustic simulation method based on the low-frequency waveguide digital grid and geometric modeling is characterized by comprising the following steps of: S1, importing a three-dimensional scene model formed by triangular patches, and initializing sound source parameters and receiver positions; S2, acquiring a plurality of sound field propagation paths through geometric acoustic pre-analysis based on the three-dimensional scene model, the sound source parameters and the receiver positions, and calculating initial perception importance parameters for each sound field propagation path; S3, distributing each sound field propagation path to a first calculation strategy or a second calculation strategy for processing according to the initial perception importance parameter, wherein the simulation precision of the first calculation strategy is higher than that of the second calculation strategy; S4, in the simulation calculation process, real-time acoustic characteristics of each sound field propagation path are monitored in real time, and real-time perception contribution degree is dynamically estimated according to the real-time acoustic characteristics; S5, dynamically adjusting a calculation strategy adopted by the corresponding sound field propagation path according to the real-time perception contribution; s6, fusing sound field data processed by different calculation strategies to generate an acoustic simulation result.
2. The acoustic simulation method based on low-frequency waveguide digital mesh and geometric modeling according to claim 1, wherein the step S1 of importing a three-dimensional scene model composed of triangular patches comprises supporting direct importing of a defect model containing gaps or overlapping surfaces without pre-converting the defect model into a closed body mesh.
3. The acoustic simulation method based on low-frequency waveguide digital mesh and geometric modeling according to claim 1, wherein the initial perceptual importance parameter in S2 is obtained by calculating a quantized initial score for each sound field propagation path based on at least its reflection order and cumulative propagation attenuation in the geometric acoustic pre-analysis.
4. The acoustic simulation method based on low-frequency waveguide digital mesh and geometric modeling according to claim 1, wherein S3 comprises: Comparing the initial perceptual importance parameter to an initial threshold; And distributing sound field propagation paths with initial perception importance parameters higher than the initial threshold to the first calculation strategy, and distributing the rest to the second calculation strategy.
5. The acoustic simulation method based on the low-frequency waveguide digital grid and geometric modeling of claim 4, wherein the first calculation strategy is a time domain wave equation solving method based on the digital waveguide grid and is used for accurately simulating interference and diffraction physical phenomena of sound waves; the second calculation strategy is a geometric acoustic method based on a ray tracing or mirror image sound source method and is used for efficiently simulating reflection, scattering and energy attenuation of sound rays.
6. The acoustic simulation method based on low-frequency waveguide digital grid and geometric modeling according to claim 5, wherein within the first calculation strategy, the local calculation accuracy of the associated digital waveguide grid is dynamically adjusted according to the real-time perception contribution; And dynamically selecting a corresponding reflection or scattering model in the second calculation strategy according to the acoustic scattering attribute of the surface interacted with by the sound field propagation path.
7. The acoustic simulation method based on the low-frequency waveguide digital grid and geometric modeling of claim 1, wherein in S4, the real-time acoustic characteristics of each sound field propagation path monitored in real time at least comprise sound pressure level, propagation direction and arrival time; The dynamic evaluation in the real-time perceived contribution is dynamically evaluated from the real-time acoustic features, a dynamic correction is calculated based on at least the monitored sound pressure level change, the delay of the arrival time with respect to the direct sound and the angle of the propagation direction with respect to the listener, and this dynamic correction is used for updating the real-time perceived contribution.
8. The acoustic simulation method based on low-frequency waveguide digital grid and geometric modeling of claim 1, wherein the step S5 dynamically adjusts the calculation strategy adopted by the corresponding sound field propagation path, and specifically comprises the following steps: S51, comparing the real-time perception contribution degree with a preset upgrading threshold value, and migrating a sound field propagation path with the contribution degree raised to the upgrading threshold value from the second calculation strategy to the first calculation strategy for recalculation; s52, comparing the real-time perception contribution degree with a preset degradation threshold value, and migrating a sound field propagation path with the contribution degree falling below the degradation threshold value from the first calculation strategy to the second calculation strategy for recalculation; the upgrading threshold and the degrading threshold are adaptive thresholds which are dynamically adjusted according to simulation calculation load or target accuracy.
9. The acoustic simulation method based on low-frequency waveguide digital grid and geometric modeling according to claim 1, wherein the step of S6 is performed in a frequency domain, and for the low-frequency band data from the first calculation strategy and the high-frequency band data from the second calculation strategy, in an overlapping frequency band, weights which change smoothly with frequency are allocated to the two data and weighted and overlapped to generate continuous full-frequency band frequency response; the acoustic simulation result comprises a binaural or monaural impulse response generated based on the full-band frequency response, and at least one acoustic parameter of reverberation time, voice clarity and music clarity calculated from the impulse response.
10. Acoustic simulation system based on low frequency waveguide digital mesh and geometric modeling for implementing an acoustic simulation method based on low frequency waveguide digital mesh and geometric modeling according to any one of claims 1-9, characterized in that it comprises: the model input module is used for importing a three-dimensional scene model formed by triangular patches; the initialization module is used for configuring sound source parameters and receiver positions; a perceived scheduling engine, further comprising: The pre-analysis unit is used for acquiring a sound field propagation path through geometric acoustic pre-analysis and calculating an initial perception importance parameter; a strategy allocation unit for allocating an initial calculation strategy for the sound field propagation path; The dynamic evaluation unit is used for monitoring the real-time acoustic characteristics in the simulation process and dynamically evaluating the real-time perception contribution degree; The strategy adjustment unit is used for dynamically adjusting the calculation strategy according to the real-time perception contribution degree; A computing engine including a first computing unit for executing the first computing policy and a second computing unit for executing the second computing policy; And the fusion output module is used for fusing the data and generating an acoustic simulation result.

Description

Acoustic simulation method and system based on low-frequency waveguide digital grid and geometric modeling Technical Field The invention relates to the technical field of acoustic simulation, in particular to an acoustic simulation method and system based on low-frequency waveguide digital grids and geometric modeling. Background The final goal of audibility-oriented acoustic simulations is to generate sound signals that are highly fidelity in subjective auditory perception, indistinguishable from real sounds. This goal places extreme demands on the efficiency of the simulation technique, as audibility, especially real-time or interactive audibility, must complete all calculations within a limited time window. Although the traditional low-frequency fluctuation (DWM) +high-frequency geometric mixed modeling framework lays the foundation of cross-frequency-band simulation, the resource allocation strategy and the audible core requirement-the maximization of the efficiency of perception accuracy guidance-have fundamental contradictions. The resource allocation of the current hybrid approach is based on a fixed frequency division, which results in a digital waveguide grid (DWM) analog of the low frequency band being trapped in a globally homogenized computation mode. Regardless of the actual contribution of the acoustic event to the final auditory sensation, so long as its frequency is below the demarcation point, a computationally expensive DWM is uniformly employed for full-precision simulation. However, in complex architectural sound fields, the low frequency energy distribution is highly unbalanced-early strongly reflected sound paths (perceived critical paths) that are critical to creating spatial perception, clarity are mixed with large amounts of late diffracted and modal sounds (perceived minor components) that are weak in energy, masked in the reverberant tail. The existing method can not identify the huge difference in the perception importance, and wastes a large amount of calculation resources on secondary components with very little influence on the hearing sense, so that the overall calculation efficiency is low, and the feasibility of realizing real-time audibility in a large scene is severely restricted. Disclosure of Invention The invention aims to provide an acoustic simulation method and system based on low-frequency waveguide digital grids and geometric modeling, so as to solve the defects in the background technology. In order to achieve the above purpose, the invention provides the following technical scheme that the acoustic simulation method based on the low-frequency waveguide digital grid and geometric modeling comprises the following steps: S1, importing a three-dimensional scene model formed by triangular patches, and initializing sound source parameters and receiver positions; S2, acquiring a plurality of sound field propagation paths through geometric acoustic pre-analysis based on the three-dimensional scene model, the sound source parameters and the receiver positions, and calculating initial perception importance parameters for each sound field propagation path; S3, distributing each sound field propagation path to a first calculation strategy or a second calculation strategy for processing according to the initial perception importance parameter, wherein the simulation precision of the first calculation strategy is higher than that of the second calculation strategy; S4, in the simulation calculation process, real-time acoustic characteristics of each sound field propagation path are monitored in real time, and real-time perception contribution degree is dynamically estimated according to the real-time acoustic characteristics; S5, dynamically adjusting a calculation strategy adopted by the corresponding sound field propagation path according to the real-time perception contribution; s6, fusing sound field data processed by different calculation strategies to generate an acoustic simulation result. In a preferred embodiment, the step S1 of importing a three-dimensional scene model composed of triangular patches includes supporting direct importing of a defect model including gaps or overlapping surfaces, without pre-converting the defect model into a closed volume grid. In a preferred embodiment, the initial perceptual importance parameter in S2 is obtained by calculating a quantized initial score for each sound field propagation path based at least on its reflection order and cumulative propagation attenuation in the geometric acoustic pre-analysis. In a preferred embodiment, the S3 includes: Comparing the initial perceptual importance parameter to an initial threshold; And distributing sound field propagation paths with initial perception importance parameters higher than the initial threshold to the first calculation strategy, and distributing the rest to the second calculation strategy. In a preferred embodiment, the first calculation strategy is a digital waveguide grid-ba