Aiming at the problem that the array design,which is based on experience or mathematical model, cannot fully exploit acoustic localization potential of microphone array,an universal design model for multi-arm spiral arrays is proposed,two weighted synthetic objective functions are established separately,by taking the main lobe width(MLW)and maximum side lobe level(MSL)of wave beam as evaluation indicators. By applying the non-dominated sorting genetic evolution algorithm,iterative optimization on model parameters and a non-dominated solution set of the microphone array configuration is obtained. For a 56-microphone multi-arm spiral array,the microphone polar diameter is firstly considered as design variable,and then a joint design of these polar diameters and the spiral angle is carried out. Results show that the designed multi-arm spiral microphone array has a stable MSL in a wide frequency range,and the joint design considering of spiral angles innovate layout form of multi-arm spiral arrays,which further decrease the MLW and MSL. In the end,based on the algorithm adjacent dual sound sources localization it is verified by comparing with the conventional logarithmic multi-arm spiral array and Underbrink spiral array that the designed array has high spatial resolution and interference suppression capability.
维普
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