Optimal design of multi-arm spiral microphone array
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.
万方数据
维普
