Jung-Woo Choi

Yang-Hann Kim

Unique in addressing two different problems – sound visualization and manipulation – in a unified way Advances in signal processing technology are enabling ever more accurate visualization of existing sound fields and precisely defined sound field production. The idea of explaining both the problem of sound visualization and the problem of the manipulation of sound within one book supports this inter-related area of study. With rapid development of array technologies, it is possible to do much in terms of visualization and manipulation, among other technologies involved with the spatial distribution of sound. This book aims to explore various basic functions for the visualization and manipulation and demonstrate to the reader how these properties determine the quality of visualization and manipulation. The first half of the book introduces some basic and general concepts and theories and the second part of the book explains a number of techniques in sound visualization and manipulation. It offers a unified presentation to two very different topics - sound field visualization techniques based on microphone arrays, and techniques for generation of controlled sound fields using loudspeaker arrays. The authors emphasize the similarities between these two physical problems and between the mathematical methods used for solving them. With extensive examples throughout the book, chapters include: Acoustic Wave Equation and its Basic Physical Measures, Acoustic Wave Equation and its Basic Physical Measures, Basic Theory of Sound Visualization, Acoustic Holography, Beamforming, Basic Theory of Sound Manipulation, Sound Focusing, and Sound Field Reproduction. The first book to combine both the visualization and manipulation of sound technologies in one comprehensive volume Presents the basic concepts using simple one dimensional cases and then extends the concept to three dimensional cases, enabling easier understanding of the fundamental concepts through the use of minimum mathematics Provides a solid understanding of associated physics as well as mathematical concepts for understanding the technologies, addressing diffraction problems in an integrated format by using Kirchhoff-Helmholtz integral equation Uses extensive examples demonstrating the benefits and drawbacks of various applications, including beamforming and acoustic holography A valuable resource forpost/graduate students, acoustic engineers, audio and noise control system developers

Sound Visualization and Manipulation

Unique in addressing two different problems – soundvisualization and manipulation – in a unified way Advances in signal processing technology are enabling ever moreaccurate visualization of existing sound fields and preciselydefined sound field production. The idea of explaining both theproblem of sound visualization and the problem of the manipulationof sound within one book supports this inter-related area ofstudy. With rapid development of array technologies, it ispossible to do much in terms of visualization and manipulation,among other technologies involved with the spatial distribution ofsound. This book aims to explore various basic functions for thevisualization and manipulation and demonstrate to the reader howthese properties determine the quality of visualization andmanipulation. The first half of the book introduces some basic andgeneral concepts and theories and the second part of the bookexplains a number of techniques in sound visualization andmanipulation. It offers a unified presentation to two verydifferent topics - sound field visualization techniques based onmicrophone arrays, and techniques for generation of controlledsound fields using loudspeaker arrays. The authors emphasize thesimilarities between these two physical problems and between themathematical methods used for solving them. With extensive examples throughout the book, chapters include:Acoustic Wave Equation and its Basic Physical Measures, AcousticWave Equation and its Basic Physical Measures, Basic Theory ofSound Visualization, Acoustic Holography, Beamforming, Basic Theoryof Sound Manipulation, Sound Focusing, and Sound FieldReproduction. The first book to combine both the visualization andmanipulation of sound technologies in one comprehensive volume Presents the basic concepts using simple one dimensional casesand then extends the concept to three dimensional cases, enablingeasier understanding of the fundamental concepts through the use ofminimum mathematics Provides a solid understanding of associated physics as well asmathematical concepts for understanding the technologies,addressing diffraction problems in an integrated format by usingKirchhoff-Helmholtz integral equation Uses extensive examples demonstrating the benefits anddrawbacks of various applications, including beamforming andacoustic holography A valuable resource forpost/graduate students, acousticengineers, audio and noise control system developers

In Sound Propagation: An Impedance Based Approach, Professor Yang-Hann Kim introduces acoustics and sound fields by using the concept of impedance. Kim starts with vibrations and waves, demonstrating how vibration can be envisaged as a kind of wave, mathematically and physically. One-dimensional waves are used to convey the fundamental concepts. Readers can then understand wave propagation in terms of characteristic and driving point impedance. The essential measures for acoustic waves, such as dB scale, octave scale, acoustic pressure, energy, and intensity, are explained. These measures are all realized by one-dimensional examples, which provide mathematically simplest but clear enough physical insights. Kim then moves on to explaining waves on a flat surface of discontinuity, demonstrating how propagation characteristics of waves change in space when there is a distributed impedance mismatch. Next is a chapter on radiation, scattering, and diffraction, where Kim shows how these topics can be explained in a unified way, by seeing the changes of waves due to spatially distributed impedance. Lastly, Kim covers sound in closed space, which is considered to be a space that is surrounded by spatially distributed impedance, and introduces two spaces: acoustically large and small space. The bulk of the book is concerned with introducing core fundamental concepts, but the appendices are included as the essentials as well to cover other important topics to extend learning. Offers a less mathematically-intensive means to understand the subject matter Provides an excellent launching point for more advanced study or for review of the basics Based on classroom tested materials developed over the course of two decades Companion site for readers, containing animations and MATLAB code downloads Videos and impedance data available from the author's website Presentation slides available for instructor use Sound Propagation is geared towards graduate students and advanced undergraduates in acoustics, audio engineering, and noise control engineering. Practicing engineers and researchers in audio engineering and noise control, or students in engineering and physics disciplines, who want to gain an understanding of sound and vibration concepts, will also find the book to be a helpful resource.

Yang-Hann Kim

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