1st Edition

An Introduction to Virtual Sound Barriers

By Xiaojun Qiu Copyright 2020
    170 Pages 160 B/W Illustrations
    by CRC Press

    169 Pages 160 B/W Illustrations
    by CRC Press

    A virtual sound barrier is an active noise control system that uses arrays of loudspeakers and microphones to create a useful size of quiet zone and can be used to reduce sound propagation, radiation, or transmission from noise sources or to reduce noise level around people in a noisy environment. This book introduces the history, principle, and design methods of virtual sound barriers first, and then describes recent progress in research on the systems. Two virtual sound barrier systems, i.e., planar virtual sound barrier system and three-dimensional virtual sound barrier system, are discussed including applications, limitations and future direction discussions. 

    1. Introduction

    1.1 Sound propagation

    1.2 Passive sound barriers

    1.3 Active sound barriers

    1.4 Virtual sound barriers

    2. Planar Virtual Sound Barriers

    2.1 Problem description

    2.2 Control of sound propagation in free field

    2.4 Control of sound radiation from an opening of an enclosure

    2.5 Control of sound transmission via an opening into an enclosure

    3. Three-Dimensional Virtual Sound Barriers

    3.1 Problem description

    3.2 Creation of a quiet zone in a noisy environment

    3.3 Performance with a diffracting sphere inside the quiet zone

    3.4 Performance near a reflective surface

    3.5 Error sensing strategies

    3.6 Virtual error sensors

    4. Applications

    4.1 Noise radiation control from power transformers in a hemi-closed space

    4.2 Sound transmission control through an open window into a room

    4.3 Implementation issues

    5. Summary and Perspectives

    5.1 Summary

    5.2 Perspectives




    Xiaojun Qiu is a professor in Audio, Acoustics and Vibration at Center for Audio, Acoustics and Vibration in Faculty of Engineering and Information Technology, University of Technology Sydney. He received his Bachelor and Master degrees from Peking University in 1989 and 1992, and his PhD from Nanjing University in 1995, respectively, all majoring in Acoustics. He worked in the University of Adelaide as a Research Fellow in the field of active noise control from 1997 to 2002, worked in the Institute of Acoustics of Nanjing University as a professor on Acoustics and Signal processing from 2002 to 2013, and worked at RMIT University as a Professor of Design on Audio Engineering from 2013 to 2016. He joined University of Technology Sydney in 2016. His main research areas include noise and vibration control, room acoustics, electro-acoustics and audio signal processing, particularly applications of active control technologies. He is a Fellow of Audio Engineering Society, and serves as an Associate Editor for the International Journal of Acoustics and Vibration and an Associate Technical Editor for the Journal of Audio Engineering Society. He has published 3 books, 5 book chapters and more than 400 technique papers, and has been the principal investigator for numerous projects. He has also been granted more than 50 patents on audio acoustics and audio signal processing.