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Multi-spherical array multiband sound source rapid orientation method

A broadband sound source and ball array technology, which is applied to direction determination devices, measuring devices, instruments, etc., can solve the problems of insufficient positioning accuracy and complicated calculation, so as to improve the direction accuracy, reduce the calculation amount, and increase the frequency bandwidth. Effect

Active Publication Date: 2018-04-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problems of complex calculation and insufficient positioning accuracy in the orientation of multi-broadband sound source signals

Method used

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  • Multi-spherical array multiband sound source rapid orientation method
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  • Multi-spherical array multiband sound source rapid orientation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Step 1: Based on the discrete Fourier transform, the frequency-space domain model of the multi-sphere array sound field is established.

[0087] The multi-sphere array is composed of two concentric open spheres, and the radii of the two ball arrays are defined as r 1 = 0.1m, r 2 = 0.14m. The surface of any open sphere is evenly distributed with L=32 omnidirectional sound pressure sensors, and the schematic diagram of the geometric model of the double-sphere array is shown in figure 2 shown. Highest spherical harmonic decomposition order Here N=4.

[0088] Define three incoherent far-field sinusoidal linear frequency sweep signals, three acoustic signal frequency ranges from 1.2kHz to 3.2kHz and linearly sweep at a frequency change rate of 8kHz / s. The incident directions of the three acoustic signals are (120°, 90°), (90°, 180°) and (60°, 270°) respectively. The signal-to-noise ratio of the signal received by the microphone is set to 0dB. The number of snapshots...

Embodiment 2

[0135] Define the signal-to-noise ratio (Signal-to-Noise Ratio of the SFT components, SNR-SFT) of the spherical Fourier transform component, and the SNR-SFT is written as:

[0136]

[0137] Among them, ||·|| F Denotes the Frobenius norm, P nm (k) and denote the theoretical and estimated values ​​of the spherical Fourier transform components, respectively. According to the results of the directional algorithm program execution in Embodiment 1, the SNR-SFT parameters can be used to evaluate the DOA estimation performance of the spherical microphone array.

[0138] Using three incoherent far-field sinusoidal linear sweep signals, the three acoustic signals range in frequency from 0.1kHz to 9.1kHz and are linearly swept at a frequency change rate of 10kHz / s. The incident directions of the three acoustic signals are (120°, 90°), (90°, 180°) and (60°, 270°) respectively. The signal-to-noise ratio of the signal received by the microphone is set to 0dB. The number of snapshot...

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Abstract

The invention discloses a multi-spherical array multiband sound source rapid orientation method, and belongs to the technical field of sound source orientation and detection. A frequency space domainmodel of a multi-spherical array sound field is established based on discrete Fourier transform; a spherical harmonic domain model of the multi-spherical array sound field is constructed based on spherical Fourier transform; the spherical harmonic coefficient corresponding to the maximum modal intensity of each spherical harmonic order is selected so as to obtain the spherical harmonic coefficientafter fusion of the multi-spherical array; the frequency-dependent component of the spherical harmonic coefficient is removed and the spherical Fourier transform component only including the angle-dependent component is obtained; the cross spectrum of the spherical Fourier transform component is constructed, the spherical Fourier transform component or the cross spectrum thereof are blocked and the estimation value of the propagator is obtained through combination of the linear regression method; an orthogonalized noise subspace is constructed based on the estimation value of the propagator,and the spatial spectrum of the direction of arrival is obtained by using mutual orthogonalization of the signal and the noise; and the incident sound source direction is scanned, and the sound sourcedirection corresponding to the maximum peak in the spatial spectrum is the direction-of-arrival angle of the sound source.

Description

technical field [0001] The invention relates to a multi-broadband sound source orientation method, in particular to a multi-spherical array-based multi-broadband source rapid orientation method, which belongs to the technical field of sound source directional detection. Background technique [0002] Passive acoustic detection technology is one of the important development directions in the application of array signal processing. Its main task is to find the sound source target and determine the direction of arrival (Direction of Arrival, DOA) of the sound source. It is an important means and technical branch of target detection. . In many practical applications, the coexistence of multiple targets is common, and the frequency band of the sound source signal is wide, and the frequency bands of different signals may be different. Therefore, the passive acoustic detection system is required to be able to accurately orient the azimuth and elevation angles of multiple broadband ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/00
CPCG01S3/00
Inventor 潘曦王华阳陈秀梅娄志毅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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