전달 함수의 시변성이 음향 홀로그래피에 미치는 영향 = Effect of time-varying transfer function on acoustic holography

To apply step-by-step measurement for acoustic holography, transfer function between signals of different position must be time-invariant. However, when the transfer function is time-variant, there are errors when we construct hologram. When position or direction of excitation to the source is different, depending on each measurement step, spatial distribution of sound radiation from source will be different with respect to the excitation. Therefore, the transfer function varies with regard to the measurement step. On the other hand, if the relative positions between sound source and microphones varies with time, the transfer function also varies with time. Errors due to the varying transfer function are discussed, when they are seen in time domain. It is proposed to interpolate the transfer function to gain time domain signals. To reduce the effect of time-dependent transfer function, it is proposed to arrange reference microphone near center of the aperture.
Advisors
김양한researcherKim, Yang-Hannresearcher
Publisher
한국과학기술원
Issue Date
2004
Identifier
237921/325007  / 020023386
Language
kor
Description

학위논문(석사) - 한국과학기술원 : 기계공학전공, 2004.2, [ ii, 103 p. ]

Keywords

방사 패턴 변화; 전달 함수의 시변성; 단계적 측정법; 음향 홀로그래피; 음원 위치 변화; Source position variance; Radiation pattern variance; Time-variance of transfer function; Step-by-step measurement; Acoustic holography

URI
http://hdl.handle.net/10203/46012
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=237921&flag=t
Appears in Collection
ME-Theses_Master(석사논문)
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