Sensors, Vol. 19, Pages 4326: Arbitrary Microphone Array Optimization Method Based on TDOA for Specific Localization Scenarios

Sensors, Vol. 19, Pages 4326: Arbitrary Microphone Array Optimization Method Based on TDOA for Specific Localization Scenarios
Sensors doi: 10.3390/s19194326
Authors:
Haitao Liu
Thia Kirubarajan
Qian Xiao

Various microphone array geometries (e.g., linear, circular, square, cubic, spherical, etc.) have been used to improve the positioning accuracy of sound source localization. However, whether these array structures are optimal for various specific localization scenarios is still a subject of debate. This paper addresses a microphone array optimization method for sound source localization based on TDOA (time difference of arrival). The geometric structure of the microphone array is established in parametric form. A triangulation method with TDOA was used to build the spatial sound source location model, which consists of a group of nonlinear multivariate equations. Through reasonable transformation, the nonlinear multivariate equations can be converted to a group of linear equations that can be approximately solved by the weighted least square method. Then, an optimization model based on particle swarm optimization (PSO) algorithm was constructed to optimize the geometric parameters of the microphone array under different localization scenarios combined with the spatial sound source localization model. In the optimization model, a reasonable fitness evaluation function is established which can comprehensively consider the positioning accuracy and robustness of the ...

Source: Sensors - October 6, 2019 Category: Biotechnology Authors: Haitao Liu Thia Kirubarajan Qian Xiao Tags: Article Source Type: research