Sound field reproduction by using an array of loudspeakers = 스피커 어레이를 이용한 음장 재현

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This study proposes methods to reproduce a sound field in a selected control region using an array of loudspeakers both temporally and spatially. The sound field that we desire to reproduce is that used for special effects in movies and computer games, or that in real life, i.e., concert halls and stadiums. The desired field is composed of sound waves that come into the control region from outside the region. If we can generate a sound field that is identical to the desired field using an array of loudspeakers, the experience of a listener in the field will be identical to that of the listener in the desired field. In other words, this study aims to mimic the desired field in a control region so as to make listeners feel as if they were in the desired field. This study divides sound field reproduction into the two categories of rendering and duplication according to the desired field. First, if the desired field is used for special effects in movies or computer games, it can be regarded as given. Thus, the problem is reduced to a problem of generating an arbitrary incident wave because the desired field is a superposition of incident waves. This problem is defined as a rendering problem, the aim of which is to generate an arbitrary sound wave and then create a virtual sound source. On the other hand, if the desired field actually exists, it is not regarded as given. Hence this problem contains not only a generation problem, but also a measurement problem. The measurement problem involves measuring the desired field, and an important issue related to this is to devise a method that reduces the number of microphones. The generation problem involves developing a method to generate the reproduced field. It is therefore reduced to a problem of determining the input signals that is fed into the loudspeakers. As a rendering method, a method has been proposed that concentrates sound energy at a point in the wave number domain. Based on this previous method, the prese...
Advisors
Kim, Yang-Hannresearcher김양한researcher
Description
한국과학기술원 : 기계공학전공,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466307/325007  / 020037945
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 기계공학전공, 2011.2, [ v, 170 p. ]

Keywords

음장 재현; 가상 음원 렌더링; 음장 복사; sound field duplication; virtual sound source rendering; sound field reproduction

URI
http://hdl.handle.net/10203/42618
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466307&flag=dissertation
Appears in Collection
ME-Theses_Ph.D.(박사논문)
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