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Optimal Design Method of Stereo Microphone Array Based on Hybrid Gravity Search Algorithm

A gravitational search algorithm and microphone array technology are applied in the field of microphones to achieve the effects of suppressing the interference of backward noise, fast iterative convergence speed, and improving effectiveness

Active Publication Date: 2017-04-19
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] The object of the present invention is to propose a stereo microphone array optimization method based on a hybrid gravitational search algorithm to overcome the existing problems in the prior art; the stereo microphone array optimized by the method of the present invention can make up for the inability to distinguish the traditional planar array positioning results. Insufficient direction of arrival of front and rear waves, suppression of incoming waves, and passive positioning of target noise sources in complex acoustic environments

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  • Optimal Design Method of Stereo Microphone Array Based on Hybrid Gravity Search Algorithm
  • Optimal Design Method of Stereo Microphone Array Based on Hybrid Gravity Search Algorithm
  • Optimal Design Method of Stereo Microphone Array Based on Hybrid Gravity Search Algorithm

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Embodiment Construction

[0053] 1. Umbrella array model

[0054] Assuming a near-field conventional beam model, the M-element umbrella array is placed vertically in space, and a three-dimensional rectangular coordinate system is established. The three-dimensional space coordinates of each array element can be expressed as, and p i (x i ,y i ,z i ), i=1,2,...M, and

[0055]

[0056] Among them, l i is the distance from the i-th array element to the origin of the base array, is the angle between the arm of the i-th array element and the z-axis, θ i is the angle between the projection of the arm on the xOy plane and the x-axis. The array structure can be represented by a matrix as

[0057] P=[p 1 ,p 2 ,p 3 ,...,p M ] T

[0058] In distance matrix z=H 0 Set up a frequency f on the plane 0 The point sound source of , its three-dimensional coordinates are B(x B ,y B ,H 0 ). For the convenience of research, the influence of multipath effect is ignored. If s i (t) is the acoustic sign...

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Abstract

The invention provides a hybrid gravitational search algorithm-based stereo microphone array optimization design method. The method includes the following steps that: a fitness function of the main parameters of a stereo microphone array under a hybrid gravitational search algorithm framework is constructed; and an array structure of the stereo microphone array, which has narrower mainlobe width under a certain sidelobe level, is optimized. With the stereo microphone array which is optimized and designed by the method of the invention adopted, the defect of incapability of identifying the directions of arrival of back and front waves based on traditional planar array positioning results can be eliminated, and back incoming waves can be suppressed, and passive location of a target noise source under a complex sound environment can be realized.

Description

【Technical field】 [0001] The invention belongs to the technical field of microphones, in particular to an optimal design method for a stereo microphone array. 【Background technique】 [0002] In reality, the noise source of the substation is more complex, and the positioning results of the planar array cannot distinguish the direction of arrival of the front and rear waves, while the volumetric array can scan the entire space and suppress the incoming waves. The performance of the volume array is largely affected by the array structure, the number of array elements and the array aperture. Under the premise of the same number of array elements and array aperture, the main lobe width and maximum side lobe level of the beam patterns of different array structures are different, and the resulting beam responses are also different, which has a great impact on the performance of noise source identification and positioning . The main lobe width and side lobe level are contradictory...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R5/027G06N3/00
Inventor 吴健杨坤德耿明昕刘亚雄白晓春吕平海雷志雄夏麾军安翠翠樊创
Owner STATE GRID CORP OF CHINA
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