A Real-time Sound Field Separation Method Based on Time Domain Equivalent Source Method

Abstract

The invention discloses a real-time sound field separation method based on the time-domain equivalent source method. A measurement surface is arranged between the target source and the interference source, and the time-domain sound pressure and the time-domain sound pressure at each measurement point on the measurement surface are collected synchronously. Particle velocity; Arrange equivalent sources on both sides of the measurement surface to simulate the target source sound field and interference source sound field respectively; Use linear interpolation function to interpolate the time-domain source intensity integral of each equivalent source to establish each measurement at any time The transfer relationship between the sound pressure of the point, the particle velocity and the source intensity of each equivalent source; from the initial moment, the time-domain source intensity integral of each equivalent source on both sides of the measurement surface at the corresponding time is obtained sequentially; according to the obtained The time-domain source intensity integral of the equivalent source at each moment and the transfer relationship between the equivalent source and any measuring point are calculated to obtain the sound field of the target source and the sound field of the interference source, and realize real-time sound field separation. The invention allows the measurement surface to be in any shape, and can separate the radiation sound field of the target sound source with any shape in the reverberation environment.

Description

technical field [0001] The invention relates to a sound field separation method in the noise field, more specifically a real-time sound field separation method based on a time-domain equivalent source method. Background technique [0002] In actual engineering, the acoustic measurement environment is often not an anechoic room, but in a reverberation environment. The interference sound generated by the reverberation environment affects the accurate measurement of the sound field radiated by the target sound source. Therefore, it is necessary to use sound field separation technology to separate the The influence of interfering sound sources is separated from the measurement result. The sound field separation technology was originally developed to separate the simple harmonic sound fields on both sides of the measurement surface in the frequency domain. The main methods include: spatial Fourier transform method, statistical optimal near-field acoustic holography algorithm, bou...

AI Technical Summary

Problems solved by technology

However, when the sound source is irregular in shape such as cylindrical or elliptical cylindrical, the spherical measuring surface will not be able to effectively separate the target sound field, and the error of the particle velocity caused by the finite difference approximation will also affect the separation accuracy

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