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
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[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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