【作者】 喻径舟； 李双田；

【Author】 Yu Jingzhou~(1,2) Li Shuangtian~(1,2) 1.Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China 2.Graduate University of the Chinese Academy of Sciences,Beijing 100049,China

【机构】 中国科学院声学研究所； 中国科学院研究生院；

【摘要】 本文以建立一个小尺度、微间距、超指向性麦克风阵列的数学模型为目标,采用声压梯度算法,分析并导出了端射阵麦克风阵列的指向性函数及指向性因子的表达式,由此导出了一个二元麦克风端射阵为基本单元的一阶声压梯度处理算法(PGP)的数学模型。考虑到不同间距的传感器通过声压梯度法得出的结果对声波的频率适应范围有所不同,本文还给出了获得较宽的带宽和进一步增强系统指向性的方法。与传统的麦克风阵列处理方法相比,该阵列的接收能量更为集中,指向性更强。更多还原

【Abstract】 In this paper,to establish a mathematical model of microphone array with vanishingly small separations and small-scale and super-direction,the expression of directivity function and directivity factor of the end-fire microphone array are analyzed and derived using pressure gradient algorithm.According to that,a mathematical model of first-order pressure gradient processor(PGP) based on the end-fire array with two microphones is derived.Considering the difference of the suitable frequency band caused by the different distances between microphones,a method to increase the bandwidth and to enhance the directivity of system is provided.Comparing with traditional microphone array process,the super-directional microphone array based on the end-fire array can receive the signal more concentratively and more directionally.更多还原