用于阵列流型快速测量的宽带方法∗

摘要

Array manifold is one of the most important parameters in microphone array signal processing, which affect the performance of detecting range and precision widely. Array manifold is related to property consistency of microphones,array structure,operating environment and etc. And already there’re methods used to measure,which are exerted step by step according to frequencies and angles shifting in series,while it’s time consuming for broad-band measuring. A new method for fast measuring is proposed in this paper:The testing broadband source is com-posed of multiple sine waves, and each of frequencies is uncorrelated with each other after processed by discrete Fourier transform;the waves on microphone array are processed by FFT algorithm and then get array manifold easily. Experiment in semi-anechoic chamber proved that:the method revealed in this paper can fast measure broadband manifold of microphone array accurately.%阵列流型是传声器阵列信号处理的重要参数，直接影响阵处理性能。阵列流型与传声器的一致性、阵列结构和使用环境等密切相关，已有方法按照频率和角度逐一完成测量，但耗时是密集频率宽带测量的突出问题。论文提出了一种传声器阵列流型宽带测量方法：通过分析宽带信号在离散傅里叶变换之后各频率数据的相关性，提出根据非相关性原则构造宽带测量源信号，并在数据处理中运用FFT算法，综合实现了阵列流型的快速测量。通过在半消声室内的实测证明了论文方法的高效性。方法具有重要的工程应用价值。