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Sound field reconstruction method based on high-order microphone array

A microphone array and sound field reconstruction technology, applied in stereo systems, electrical components, etc., can solve problems affecting the harmonic coefficients of cylinders, and achieve the effects of improving robustness, reducing measurement errors, and reducing condition numbers

Active Publication Date: 2020-06-09
西北工业大学太仓长三角研究院 +1
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Problems solved by technology

The key to sound field reconstruction is how to obtain the high-order cylindrical harmonic components of the sound field to be reconstructed. However, the noise of the microphone and the zero value of the Bessel function will affect the cylindrical harmonic coefficient, that is, the measured value of the sound field coefficient

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  • Sound field reconstruction method based on high-order microphone array
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  • Sound field reconstruction method based on high-order microphone array

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Embodiment Construction

[0060] The present invention will now be further described in conjunction with the embodiments and drawings:

[0061] Device embodiment: When using the present invention to reconstruct the spatial sound field, first use a high-order microphone to collect the local sound field sound pressure, and calculate the local sound field coefficients according to the discrete form of the inverse Fourier transform, and then according to the truncation order of the low-order sound field The number limit normalizes the high-order harmonic components in the low-order sound field to obtain the regularized low-order sound field coefficients. Then the conversion matrix is ​​calculated according to the order of the high-order microphones and the topology of the array, and the local sound field coefficients obtained at each high-order microphone are converted into the global sound field coefficients of the area to be reconstructed. Finally, according to the harmonic expression of the sound field, th...

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Abstract

The invention relates to a sound field reconstruction method based on a high-order microphone array. The method comprises the steps that firstly, a high-order microphone is used for collecting sound pressure of a local sound field, and a local sound field coefficient is calculated according to a discrete form of inverse Fourier transform; then regularization is carried out on a high-order harmoniccomponent in a low-order sound field according to a truncation order limit of the low-order sound field, and a regularized low-order sound field coefficient is obtained; a conversion matrix is calculated according to the orders of the high-order microphones and the topological structure of the array, and the local sound field coefficient obtained at each high-order microphone is converted into aglobal sound field coefficient of a to-be-reconstructed region; and finally, sound pressure distribution of the reconstructed sound field is acquired according to the harmonic expression of the soundfield.

Description

Technical field [0001] The present invention belongs to the study of parameter identification methods in acoustic signal processing algorithms. The high-order harmonic components are regularized according to the sound field frequency, combined with the addition theorem of Bessel function to construct a conversion matrix, and the local sound field coefficients are converted into global sound field coefficients. The influence of microphone error and the zero value of the Bessel function on the sound field coefficient is reduced, and the accuracy of sound field reconstruction is improved. Background technique [0002] On the modern battlefield, with the development of electronic jamming technology, the electromagnetic detection environment is getting worse and worse, especially the emergence and use of anti-radiation missiles, which pose a serious challenge to the survival of active equipment such as radar. The sound field reconstruction method based on physical principles aims to r...

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Application Information

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IPC IPC(8): H04S3/02H04S3/00
CPCH04S3/00H04S3/02
Inventor 智永锋
Owner 西北工业大学太仓长三角研究院
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