An introduction to virtual sound barriers

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.

Cover; Half Title; Title Page; Copyright Page; Contents; Preface; Author; 1: Introduction; 1.1 Sound Propagation; 1.1.1 Sound Absorption and Absorption Coefficient; 1.1.2 Sound Insulation and Transmission Loss; 1.1.3 Sound Scattering and Scattering Coefficient; 1.1.4 Sound Diffraction and Insertion Loss; 1.2 Passive Sound Barriers; 1.2.1 The MacDonald Solution; 1.2.2 The Zhao Solution; 1.2.3 The Kurze and Anderson Formula; 1.3 Active Sound Barriers; 1.3.1 Principle; 1.3.2 Secondary Sources for Active Sound Barriers; 1.3.3 Sensing Strategies for Active Sound Barriers

1.3.4 Implementation Issues1.4 Virtual Sound Barriers; 1.4.1 History; 1.4.2 Principle; 1.4.3 Design Methods; 1.4.3.1 The Expansion Method of the Primary Sound Field; 1.4.3.2 The Least Mean Square Method; 2: Planar Virtual Sound Barriers; 2.1 Problem Description; 2.2 Control of Sound Propagation in Free Fields; 2.2.1 Control of the Plane Wave Primary Sound Field; 2.2.2 Control of the Primary Sound Field Generated by Monopole Sources; 2.2.3 Control of General Primary Sound Fields; 2.3 Control of Sound Propagation Through a Finite Size Aperture

2.3.1 Primary Sound Field with a Finite Size Aperture2.3.2 Control of Sound …