Journal of Industrial Technology (산업기술연구)
- Volume 27 Issue A
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- Pages.55-60
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- 2007
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- 1229-9588(pISSN)
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- 1598-1371(eISSN)
A Study on the Eavesdropping of the Glass Window Vibration in a Conference Room
회의실내 유리창 진동의 도청에 대한 연구
- Published : 2007.02.28
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