Closed space low-frequency sound field reproduction method based on microphone random sampling

A closed space, random sampling technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, instruments, complex mathematical operations, etc., can solve the problems of small dimension of the spherical harmonic function model, slow calculation speed, fast calculation speed, etc., to achieve calculation speed Speed ​​up, ensure reproduction accuracy, and test the effect of low cost

Active Publication Date: 2020-06-12
NORTHWESTERN POLYTECHNICAL UNIV
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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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  • Closed space low-frequency sound field reproduction method based on microphone random sampling
  • Closed space low-frequency sound field reproduction method based on microphone random sampling
  • Closed space low-frequency sound field reproduction method based on microphone random sampling

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Embodiment Construction

[0053] The invention proposes to use multiple microphones to sample at random positions in a closed space, the operation is more simple and flexible, and then the sound field is recorded and reproduced through the spatial domain decomposition method of the plane wave; Compared with the complex coordinate descent algorithm, the split augmented Lagrangianshrinkage algorithm (SALSA) has a much faster calculation speed, making the plane wave model suitable for the reproduction of the unsteady sound field in the whole space.

[0054] Concrete steps of the present invention are:

[0055] Step 1: In the specific enclosed space V, according to the actual situation, establish a rectangular coordinate system.

[0056] Step 2: In the established Cartesian coordinate system, randomly select Q measuring point positions, place the microphone, and record the qth measuring point position vector as r q =[x q ,y q ,z q ] T (q=1,2,...,Q), where (·) T Indicates a transpose. Use the Q micro...

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Abstract

According to a closed space low-frequency sound field reproduction method based on microphone random sampling, a plurality of microphones are used for random position sampling in the closed space, microphone arrays such as a spherical array do not need to be used, the operation is simpler, more convenient and more flexible while the reproduction precision is ensured, and the test cost is low; recording and reproducing a sound field through a spatial domain decomposition method of a plane wave. For the calculation speed problem caused by the large cardinal number of the plane wave model, a split augmented Lagrange contraction algorithm SALSA is proposed, and compared with a complex coordinate descent algorithm, the calculation speed is greatly increased, so that the plane wave model can besuitable for the reproduction of a full-space unsteady sound field.

Description

technical field [0001] The invention belongs to the technical field of spatial sound field recording and reproduction, in particular to a low-frequency sound field reproduction method in a closed space based on microphone random sampling. Background technique [0002] In many engineering applications, it is very important to obtain prior information such as the distribution characteristics of the spatial sound field, the time-frequency characteristics of the field point, and the acoustic transfer function from the speaker to the microphone (called the impulse response in the time domain). For example, when actively controlling low-frequency noise in an enclosed space, the primary confusion faced is the unknown temporal and spatial distribution characteristics of the noise, making it difficult to propose effective assessments and solutions. For this reason, scholars at home and abroad have carried out in-depth research on restoring the real sound field characteristics with hi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G06F17/16
CPCG01H17/00G06F17/16
Inventor 陈克安胥健王磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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