Influence of microphone position error on generating spatial null sensitivity point by line microphone array

Abstract

We developed a method that picked up a sound of a target source located beyond the noise source [1]. It used an end-fire line microphone array whose direction was toward the noise source and created a spatial null sensitivity point at the noise source position. This method relied on the assumption that the precise distance between microphones was known so that all microphone outputs from the noise source became in phase by using the delay calculated by the distance. In this study, we analyzed the influence of the error of microphone distance on the performance of the method. As a result, if the real distance was larger than that of the system’s knowledge, the dip of sensitivity at the noise position was separated along the direction normal to that of the line of the microphones. On the other hand, it the distance was smaller than that of the system’s knowledge, the dip did not separate and just became shallower. Based on these results, we will propose how to compensate the microphone position error. [1] A. Ando, et al., 3pSP3, Acoustics ’17 Boston, 2017.We developed a method that picked up a sound of a target source located beyond the noise source [1]. It used an end-fire line microphone array whose direction was toward the noise source and created a spatial null sensitivity point at the noise source position. This method relied on the assumption that the precise distance between microphones was known so that all microphone outputs from the noise source became in phase by using the delay calculated by the distance. In this study, we analyzed the influence of the error of microphone distance on the performance of the method. As a result, if the real distance was larger than that of the system’s knowledge, the dip of sensitivity at the noise position was separated along the direction normal to that of the line of the microphones. On the other hand, it the distance was smaller than that of the system’s knowledge, the dip did not separate and just became shallower. Based on these results, we will propose how to compensate the microphone position error. [1] A...