Reproduction method of low frequency sound field in closed space based on random sampling of microphone

Abstract

The present invention proposes a method for reproducing a low-frequency sound field in an enclosed space based on random sampling of microphones. Multiple microphones are used to sample random positions in an enclosed space without using microphone arrays such as spherical arrays. While ensuring reproduction accuracy, the operation is more simple and flexible. , the test cost is low; the sound field is recorded and reproduced by the spatial domain decomposition method of the plane wave; and for the calculation speed problem caused by the large cardinality of the plane wave model, the split augmented Lagrangian shrinkage algorithm SALSA is proposed. Descent algorithm, the calculation speed is greatly accelerated, so that the plane wave model can be applied to the reproduction of the unsteady sound field in the whole space.

Description

technical field [0001] The invention belongs to the technical field of spatial sound field recording and reproduction, in particular to a closed space low-frequency sound field reproduction method based on microphone random sampling. Background technique [0002] In many engineering applications, it is very important to obtain a priori information such as spatial sound field distribution characteristics, time-frequency characteristics of field points, and acoustic transfer function from loudspeaker to microphone (called impulse response in time domain). For example, in the active control of low-frequency noise in a closed space, the primary puzzle is the unknown temporal and spatial distribution characteristics of the noise, so it is difficult to propose an effective evaluation and solution. For this reason, scholars at home and abroad have carried out in-depth research on the restoration of real sound field characteristics with high precision, and have proposed many sound f...

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Problems solved by technology

Among them, the spherical harmonic function model has small dimensions and fast calculation speed. Generally, spherical arrays are used, which can effectively reproduce the sound field in the vicinity of the spherical array, but the sound field will be distorted far away from the spherical array, so it is more suitable for local spatial stability and nonlinear Steady-state SFR; and the plane wave model can adopt various array forms, although it is suitable for the steady-state SFR of the whole space, but its dimension is large and the calculation speed is slow

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