Arbitrary array optimization method suitable for specific positioning scene
An optimization method, an arbitrary array technology, applied in positioning, measuring devices, instruments, etc., can solve problems that are difficult to obtain applications, difficult to guarantee the structural form of deformation, and incapable of array optimization
Inactive Publication Date: 2019-06-25
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology
At present, the research on the array optimization based on the time difference of arrival method is mainly aimed at the comparison of the positioning effect of the existing array structure and its deformed structure, and it is difficult to ensure that the deformed structure is the optimal structural form.
At the same time, some researchers have deduced the equation of the optimal positioning array structure, but only obtained a special solution, that is, a regular polyhedron structure. Only a certain number of microphones can be applied to the special solution results, and it is difficult to obtain general applications.
In addition, the equation derivation of the optimal positioning array structure is based on the positioning estimation of the omnidirectional range, and cannot be applied to the array optimization of specific positioning scenarios.
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[0077] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.
[0078] A kind of arbitrary array optimization method applicable to certain specific scenes of the present invention comprises the following steps:
[0079] 1) Construct a parametric geometric structure model of the microphone array. Take the reference microphone The coordinates are . The coordinates of other microphones can be determined by the radial distance , azimuth and elevation angle represented by three parameters, the coordinates of other microphones in the three-dimensional space are ,in , Indicates the number of microphones other than the reference microphone.
[0080] The search space for microphone array optimization can be expressed as
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The invention relates to an arbitrary array optimization method suitable for a specific positioning scene. The method includes the following steps that: 1) the parametric geometrical model of a microphone array is constructed, and a search space is provided for array optimization; 2) a spatial sound source positioning model is established based on a time difference of arrival time method; the spatial sound source positioning model is solved through a quadric weighted least squares method, and the estimated values of target sound source coordinates are obtained; and 4) a microphone array structure optimization model for the specific scene is established, and is iteratively optimized by a particle swarm optimization algorithm, so that an optimal microphone array structure under the specificpositioning scene is obtained. The method of the invention does not need to rely on prior array structure information and is suitable for the optimization of any array; and the method can perform array optimization in the specific positioning scene to obtain the global optimal array structure form of the corresponding scene. The novel microphone array optimization method provided by the inventioncan be widely applied to many fields.
Description
technical field [0001] The invention relates to an array structure optimization method for sound source localization, in particular to an arbitrary array optimization method suitable for a specific localization scene. Background technique [0002] Microphone arrays are mainly used for localization and identification of sound sources. At present, microphone array technology has been widely used in noise source identification and control, speech enhancement, multi-sound source separation, target location and tracking, and voice interaction equipment, and the core function of microphone array is sound source localization. There are three main types of technologies for sound source localization through microphone arrays, beamforming, acoustic holography, and time-of-arrival. Both the beamforming method and the acoustic holography method identify the sound source by reconstructing the two-dimensional holographic surface, but cannot obtain the actual position of the sound source ...
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Inventor刘海涛
OwnerEAST CHINA JIAOTONG UNIVERSITY