한국소음진동공학회:학술대회논문집 (Proceedings of the Korean Society for Noise and Vibration Engineering Conference)
- 한국소음진동공학회 2006년도 추계학술대회논문집
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- Pages.502-505
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- 2006
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- 1598-2548(pISSN)
음장의 복소 포락과 응용
Complex envelope of sound field and its application
- Park, Choon-Su (NOVIC, Dept. of Mechanical Engineering, KAIST) ;
- Kim, Yang-Hann (NOVIC, Dept. of Mechanical Engineering, KAIST)
- 발행 : 2006.11.16
초록
Acoustic holography allows us to predict spatial pressure distribution on any surface of interest from measured hologram. It is noteworthy that the data size is so huge that it takes long time to calculate pressure field. Moreover the reconstructed pressure field is frequently too complicated to get what we want to know. One possible candidate is complex envelope. Complex envelope in time domain is well known and widely used in various engineering field. We have attempted to extend this method to space domain, so that we can have rather simple spatial pressure picture that provides information we need, for example, where sound sources are. First we start with the simplest case. We examine the complex envelope of a plane wave on both space and wave number domain. Then we extend to monopole case. Holographic reconstructed sound field on the monopole is processed according to what we propose. We demonstrate how this method provides better picture for analyzing the sound field.