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Sound source localization calibration method

A calibration method and sound source localization technology, which can be used in positioning, measuring devices, instruments, etc., can solve the problems of small calculation amount and inability to monitor thunderstorm clouds, and achieve the effect of low calculation amount, high positioning accuracy and small error.

Active Publication Date: 2018-09-21
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

[0003] Xing Hongyan and others proposed an altitude calibration method for atmospheric electric field data to improve the consistency of electric field networking data, expand the scope of thunderstorm monitoring, effectively solve the problem of data unification at various observation stations, and avoid serious distortion in electric field networking. The method is limited to the vertical direction of altitude, and it is still impossible to monitor thunderstorm clouds from the observation perspective of the atmospheric electric field instrument
Wang Buhong et al. proposed a new method for self-correction of azimuth-dependent array element amplitude and phase errors using auxiliary array elements. Although this method is suitable for any array geometry and has a small amount of calculation, it can only be applied to Two-dimensional space

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Experimental program
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Embodiment 1

[0023] Embodiment 1 (thunder sound source localization)

[0024] A kind of sound source localization calibration method based on microphone observation angle of view of the present invention, specifically comprises following process:

[0025] Step 1, give the first thunder sound source localization inversion algorithm (such as figure 1 ), which is based on the four-element microphone array model, the propagation velocity of the thunder sound source is c, assuming that the spatial position of the sound source S is (x, y, z), r is the distance from the sound source to the coordinate origin, and z should be greater than zero. The time for S to propagate to S0(0,0,0), S1(0,h,0), S2(l,0,0), S3(l,h,0) is t respectively 0 , t 1 , t 2 , t 3 Combined with the spatial positions of the four microphones set in the model, three relative time delay values ​​are obtained: Δt 1 = t 1 -t 0 , Δt 2 = t 2 -t 0 , Δt 3 = t 3 -t 0 .

[0026] Step 2, from figure 1 The distances from S...

Embodiment 2

[0062] Embodiment 2 (spatial sound source localization)

[0063] Step 11, give the second sound source localization inversion algorithm (such as figure 2 shown), which is based on the seven-element cross matrix model, refer to figure 2 , let the sound propagation speed be c, the spatial position of the sound source S be (x, y, z), and r be the sound source to the coordinate origin M 0 distance. S propagates to microphone M 0 (0,0,0), M 1 (a,0,0), M 2 (0,a,0), M 3 (-a,0,0), M 4 (0,-a,0), M 5 (0,0,a), M 6 The time of (0,0,-a) is t respectively 0 , t 1 , t 2 , t 3 , t 4 , t 5 , t 6 , and set 5 sets of relative delay values ​​according to the model: T 1 = t 1 -t 0 ,T 2 = t 2 -t 0 , T 3 = t 3 -t 0 ,T 4 = t 4 -t 0 ,T 5 = t 6 -t 5 . h 1 The angle between S and the positive semi-axis of x is called the horizontal declination, and the range is between [0,360°]; H 2 is the elevation angle formed by S and the x-y-0 plane, the range is between [-90°,90°]...

Embodiment 3

[0107] Embodiment 3 (sound source localization calibration)

[0108] Step 25, the focus of the steps in the above two embodiments is to obtain the inverted sound source coordinates, so as to perform subsequent calibration. Assume that the observation angle N is located in the coordinate system of the original microphone array, denoted as (X, Y, Z). refer to image 3 , convert (X, Y, Z) to (0,0,0) and establish a new coordinate system, then (xx, yy, zz) is converted to (xx-X, yy-Y, zz-Z), will (xx-X,yy-Y,zz-Z) is equivalent to (XX,YY,ZZ). Let the horizontal declination (the angle with the positive semi-axis of the new coordinate system x') be h 1 , the range is between [0,360°]; the elevation angle (the angle with the new coordinate system x'-y'-0 plane) is h 2 , the range is between [-90°,90°]. h 2 If the value of is positive, it means that the sound source is above the plane where the viewing angle N is located, and if it is negative, it means that it is below the plane...

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Abstract

The invention discloses a sound source localization calibration method. The sound source localization calibration method is characterized in that through establishing a three-dimensional microphone array model, the inversion is performed by utilizing a geometric positioning method to determine the sound source orientation; then an observation angle of view is determined, and the sound source orientation is calibrated by taking the observation angle of view as a benchmark. The sound source localization calibration method disclosed by the invention has the benefits that the data conversion is performed through the observation angle of view, so that more intuitive data can be obtained from the observation angle of view; the sound source localization calibration method is small in error and can be applied to the practice for real-time sound source localization.

Description

technical field [0001] The invention relates to a method for localizing and calibrating a sound source. Background technique [0002] Sound is everywhere and accompanies people's daily life. In recent years, with the sharp increase in demand for positioning system applications in industrial, civil and military fields, positioning systems, voice recognition systems and sound source detection systems have become new research hotspots. The technology of locating the sound source based on the microphone array has gradually become the direction of people's research. However, in the actual environment, the spatial orientation information of the actual location of the sound source cannot be intuitively transmitted to the observer. Therefore, in order to better grasp the actual situation of the target sound source, it is of great practical significance to perform sound source azimuth positioning calibration under the condition of low positioning error. [0003] Xing Hongyan and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 行鸿彦杨旭
Owner NANJING UNIV OF INFORMATION SCI & TECH