Geometric sound propagation optimization method based on A-weighted variance

A technology of sound propagation and optimization methods, which is applied in design optimization/simulation, special data processing applications, complex mathematical operations, etc., to achieve the effect of reducing the amount of calculation, the number of dynamic samples, and the amount of unnecessary calculation.

Active Publication Date: 2021-06-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a geometric sound propagation optimization method based on A-weighted variance to balance the number of samples, improve the quality of audio simulation, and meet the needs of users in view of the shortcomings of the existing sound propagation simulation in terms of operational efficiency and quality stability. Improve user experience

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0027] 1. Enter: Get raw audio and virtual scenes that need to be propagated, including the following subsections:

[0028] 1.1 Collect input audio f by playing equipment, recording equipment, computer synthesis, etc.

[0029] The audio is saved as a data file format after collecting or generating, and is parsed by the program to waveform data. The audio can be vocal, natural sound or music performance, etc.

[0030] 1.2 Construction of virtual scene M by three-dimensional scanning, computer modeling, etc.

[0031] The virtual scene is represented by a triangular grid. In order to improve the efficiency of follow-up, virtual scenes need to pass automatic and manual simplified models, and remove objects that have less impact on sound propagation and more complex.

[0032] 1.3 In the virtual scene M, according to the user needs to specify the sound source position S, and the audience position L:

[0033] In this step, S and L are represented by three-dimensional coordinates (X, Y, Z...

Embodiment

[0056] Embodiments of the present invention are implemented on a computer equipped with the Intel Core i7-3770 central processor, 16GB memory. The program uses MATLAB writing, and all the parameter values ​​listed in the specific embodiments are used to obtain an experimental result that meets the design requirements. With the method of the present invention, the A-weighted variance index indicator of the output audio can be controlled under a given indicator, ensuring that the audio quality is not lower than the user's needs. The method of using traditional fixed sampling will be too low in some cases, meaning too much redundant operation; and other time the difference will be too high, meaning the number of samples, the quality of audio simulation cannot meet the user requirements. The present invention has achieved an ideal effect under different virtual scenes and input audio conditions. Using the rear path tracking and two-way path tracking as a sound propagation method, it c...

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Abstract

The invention discloses a set of self-adaptive sound propagation simulation method based on geometric acoustics, which can dynamically adjust the required sampling number based on an A-weighted variance index so as to reduce the redundant operand, improve the operation efficiency and improve the generated sound propagation simulation effect quality. The method mainly comprises the following steps: 1) inputting: acquiring an original audio and a virtual scene which need to be propagated; 2) estimating the sampling number: calculating the A-weighted variance of a single sample by using a test ray, and estimating the actually required sampling number; 3) propagation: performing impulse response calculation of the virtual scene by using the estimated sampling number; and 4) outputting: obtaining an audio result which can be heard by human ears or can be used for subsequent analysis and after propagation. The method can be combined with various commonly-used geometric acoustic sound propagation simulation frames, is applied to the fields of virtual reality, architectural acoustics and the like, is suitable for various different sound propagation scenes, original audios and sampling modes, and has high universality and stability.

Description

Technical field [0001] The present invention relates to simulation fields in computer graphics, and more particularly to a method of using a sound propagation in a virtual environment based on geometric acoustic environments. Background technique [0002] Voice of Virtual Scene Simulation, extensive demand in architectural design, virtual reality, digital entertainment and other fields. Based on geometric sound propagation simulation, due to its integrated efficiency is much higher than other methods, it is possible to generate high realistic sound simulation results in a short period of time, a large number of applications in the above field. The technique used in the background of the present invention is mainly based on path-tracking algorithms, from the sound source, rays from the sound source to indicate the sound energy, after reflection, refraction, and penetration, the position of the audience is collected, resulting in sound The result of transmitting the number of rays,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/14
CPCG06F30/20G06F17/141
Inventor 任重周昆周洪杨
Owner ZHEJIANG UNIV
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