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 a time domain equivalent source method. The method comprises the steps of arranging a measurement surface between a target source and an interference source, and synchronously collecting the time domain sound pressure and the time domain particle vibration velocity at measurement points on the measurement surface; arrangingequivalent sources on two sides of the measuring surface for respectively simulating a target source sound field and an interference source sound field; carrying out interpolation processing on the time domain source intensity integral of each equivalent source by adopting a linear interpolation function, and establishing a transfer relationship between the sound pressure and the mass point vibration velocity of each measurement point at any moment and each equivalent source intensity; sequentially obtaining the time domain source intensity integral of each equivalent source on the two sidesof the measurement surface at the corresponding moment from the initial moment; and calculating to obtain a target source sound field and an interference source sound field according to the obtained time domain source intensity integral of the equivalent source at each moment on the two sides of the measurement surface and the transfer relationship between the equivalent source and any measurementpoint, thereby realizing real-time sound field separation. According to the real-time sound field separation method, the measuring surface is allowed to be in any shape, and the radiation sound fieldof the target sound source in any shape can be separated 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...

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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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