关键词: 头佩式麦克风阵列, 绕射路径, 联合可控功率响应框架（SRP-PHAT）, 声源定位

Abstract: Head-worn microphone array has practical applications in man-portable anti-sniper detection positioning systems and robotic acoustic localization system. Usually, the sound source localization method is based on a linear or nonlinear unblocked microphone array. In this paper, considering the diffraction effect of low frequency for back microphones due to the helmet blocking, it uses a head-worn microphone array to design and research the sound source localization algorithm for the sound signal in low frequency band. This method uses the diffraction path of low-frequency acoustic waves to calculate the time delay, and utilizes the Steered Response Power and the Phase Transform（SRP-PHAT） framework for time delay compensation search positioning. Experimental results show that compared to the common unblocked localization algorithm, the method for a head-worn microphone array based on the diffraction path uses the data of microphones back to source. Obviously, it improves the accuracy of localization. Besides, the improvement achieves the best result within 1 kHz frequency band.

Key words: head-worn microphone array, diffraction path, Steered Response Power and the Phase Transform（SRP-PHAT）, sound localization