능동 소음제어를 이용한 잔향실의 저주파 특성 개선 가능성

Improvements of Reverberation Chamber's Performance by using Active Noise Control

  • 김영기 (한국항공우주연구원 위성연구부) ;
  • 오시환 (한국항공우주연구원 위성연구부) ;
  • 문상무 (한국항공우주연구원 위성연구부) ;
  • 임종민 (한국항공우주연구원 위성연구부) ;
  • 김홍배 (한국항공우주연구원 위성연구부)
  • 발행 : 2004.11.01

초록

An active method that improves low frequency characteristics of a reverberation chamber has been proposed. Spatial uniformity of sound pressure at low frequency has been increased by applying active noise control system. The system acts as frequency selective damping materials, which decreases resonance at low frequency and leave high frequency sound field as it is. Linearity of the chamber, which is essential for sound power measurement in the chamber, is guaranteed since fixed control logic has been adopted. Simple application and tests have been done in a small sized rectangular reverberation chamber which has 400Hz cutoff, Loud speakers were used to simulate a noise source and to construct an active noise control system. The spatial distribution of a sound field at 250Hz, 315Hz and 400Hz bands has been measured before and after control. The standard deviation of sound field has been decreased from 3.4dB to 2.5dB. The results show the possibility of active control system as a sound diffuser.

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