array tutorial

AFM Tech. Report 07/03SotonArray: Southampton UniversityWind Tunnel Microphone ArraySystem Guide∗Benjamin A. Fenech and Kenji TakedaFebruary 2007AbstractThis report shall serve as an introductory background to SotonAr-ray, the microphone array system at the University of Southampton.It covers the practical aspects only; namely the instrumentation setupand the beamforming software. It aims to give a basic level of un-derstanding of the system to the researcher who wants to use it, andespecially to highlight both the capabilities and limitations of the sys-tem. Since the microphone array system is a new capability for theAerodynamics and Flight Mechanics research group (AFM), the hard-ware and software is constantly being upgraded, and the details givenhere are correct only at the time of going to print.∗Corresponding author: ktakeda@soton.ac.uk1School ofEngineeringSciencesContents1 Introduction 22 Microphone Array Hardware 32.1 Microphone Array . . . . . . . . . . . . . . . . . . . . . . . . . 32.1.1 Microphones . . . . . . . . . . . . . . . . . . . . . . . . 32.1.2 Array Design . . . . . . . . . . . . . . . . . . . . . . . 52.2 Microphone Cabling . . . . . . . . . . . . . . . . . . . . . . . 62.3 Microphone Preamplifiers . . . . . . . . . . . . . . . . . . . . 62.4 Data Acquisition cabling . . . . . . . . . . . . . . . . . . . . . 72.5 Data Acquisition, Storage and Processing . . . . . . . . . . . . 72.5.1 Data Acquisition . . . . . . . . . ...