Journal of Industrial Technology (산업기술연구)

Kangwon National University, Institute of Industrial Technology (강원대학교 산업기술연구소)
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A Study on the Eavesdropping of the Glass Window Vibration in a Conference Room

회의실내 유리창 진동의 도청에 대한 연구

  • 김석현 (강원대학교 메카트로닉스 전공) ;
  • 김윤호 (강원대학교 대학원 기계메카트로닉스공학과) ;
  • 허욱 (강원대학교 대학원 기계메카트로닉스공학과)
  • Published : 2007.02.28
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Abstract

Possibility of the eavesdropping is investigated on a conference room-glass window coupled system. Speech intelligibility analysis is performed on the eavesdropping sound of the glass window. Using MLS(Maximum Length Sequency) signal as a sound source, acceleration and velocity responses of the glass window are measured by accelerometer and laser doppler vibrometer. MTF(Modulation Transfer Function) is used to identify the speech transmission characteristics of the room and window system. STI(Speech Transmission Index) is calculated by using MTF and speech intelligibility of the vibration sound is estimated. Speech intelligibilities by the acceleration signal and the velocity signal are compared.

Keywords