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A Method of Using Vector Orthogonalization to Identify Multipoint Sound Sources

A point sound source, sound source technology, applied in measurement devices, radio wave measurement systems, instruments, etc., can solve problems such as mutual interference of sound sources, and achieve the effect of solving mutual interference

Active Publication Date: 2019-12-03
东台城东科技创业园管理有限公司
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Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method of using vector orthogonalization to identify multi-point sound sources, which can solve the problem of mutual interference between sound sources when multi-point sound sources are close

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  • A Method of Using Vector Orthogonalization to Identify Multipoint Sound Sources

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specific Embodiment

[0045] combine figure 2 As shown, there are three point sound sources in the space, the frequency of the point sound sources is 1200Hz, and the intensity of the sound sources is Q 1 =0.78(pa·m), Q 2 =0.62(pa m), Q 3 =0.57(pa·m), the initial phases are Sound source S 1 , S 2 and S 3 The spatial position coordinates are (0.338, 0.471, 0.226), (0.354, 0.427, 0.217), (0.219, 0.225, 0.488), and the 9×9 equidistant rectangular array microphones are arranged on the space XOY plane with the origin of the coordinate system as the center. The distance between the microphones is 0.1m.

[0046] S01: Measure a point sound source S with a 9×9 regular rectangular grid microphone array 1 , S 2 and S 3 For the radiated sound pressure signal, perform frequency spectrum analysis on the sound pressure signal received by the microphone to obtain the frequency and frequency domain sound pressure value of the point sound source, and integrate the sound pressure signal received by the mi...

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Abstract

The invention discloses a method for using vector orthogonalization to identify multi-point sound source. The method of the invention comprises steps of arranging a plurality of point sound sources in a space, using a rectangular grid microphone array to measure point sound sources in order to obtain radiated sound pressure signals, constructing a virtual point sound source, calculating and analyzing to obtain the sound pressure signals of the virtual point sound sources which are radiated to an array sensor, constructing a sound pressure vector into an orthogonal base vector through Schmidt orthogonalization method, performing normalization to obtain a standard orthogonal set, performing inner product operation on the sound pressure vector value and each group of vectors in the standard orthogonalization system, solving a sum of squares of an inner product module value to obtain a target function, using a local optimization algorithm to search an extreme value through changing a virtual sound position, wherein a virtual sound source position corresponding to the target function extreme value is the position of a real point sound source, and calculating the strength of the point sound source. The method of the invention uses orthogonalization to combine with a Bessel inequality theorem, performs correlation identification on the basis of inner product operation, and solves a mutual-interference problem between short-distance sound sources.

Description

technical field [0001] The invention relates to the field of sound source identification of microphone arrays, in particular to a method for identifying multi-point sound sources using vector orthogonalization. Background technique [0002] With the rapid development of construction machinery, people have put forward higher requirements for the comfort and noise control of construction machinery and the environment, and sound source identification is the primary task of noise control. Acquire the position and intensity information of the sound source through sound source identification, and obtain a more effective noise source control method. [0003] Near-field acoustic holography and beamforming methods based on microphone arrays are currently more researched sound source identification methods. Near-field acoustic holography technology requires that the holographic surface be arranged very close to the sound source in order to detect the acoustic signal as much as possib...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 赵晓丹闫凯寇海亮梅德清
Owner 东台城东科技创业园管理有限公司
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