宽带环形麦克风阵列的测量与理论性能比较。

Comparison of the measured and theoretical performance of a broadband circular microphone array.

机构信息

School of Electrical and Information Engineering, The University of Sydney, New South Wales, 2006, Australia.

出版信息

J Acoust Soc Am. 2011 Dec;130(6):3827-37. doi: 10.1121/1.3658443.

Abstract

The design and construction of a circular microphone array (CMA) that has a wide frequency range suitable for human hearing is presented. The design of the CMA was achieved using a technique based on simulated directivity index (DI) curves. The simulated DI curves encapsulate the critical microphone array performance limitations: spatial aliasing, measurement noise, and microphone placement errors. This paper demonstrates how the non-regularized DI curves for a given beamforming order clearly define the bandwidth of operation, in other words, the frequency band for which the beamformer has relatively constant and maximum directivity. Detailed and comprehensive experimental data that characterizes the CMA beamformer are also presented.

摘要

本文提出了一种具有宽频率范围（适合人类听觉）的圆形麦克风阵列（CMA）的设计和构建。CMA 的设计使用基于模拟指向性指数（DI）曲线的技术来实现。模拟 DI 曲线包含了麦克风阵列性能的关键限制：空间混叠、测量噪声和麦克风位置误差。本文展示了给定波束形成阶数的非正则 DI 曲线如何清晰地定义操作带宽，换句话说，就是波束形成器具有相对恒定和最大指向性的频率带。还介绍了详细和全面的实验数据，这些数据可用于对 CMA 波束形成器进行特征描述。