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가청 주파수대 음장 변화 측정 기반 침입 감지 기술
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- Issue Date
- 2011-03
- Citation
- 한국소음진동공학회논문집, v.21, no.3, pp.212-219
- ISSN
- 1598-2785
- Publisher
- 한국소음진동공학회
- Language
- Korean
- Type
- Journal Article
- Abstract
- In this paper, intrusion detection technique based on the sound field variation of audio frequency in the security space is proposed. The sound field formed by sound source can be detected with the microphone when the obstacle or intruder is positioned. The sound field variation due to the intruder is mainly caused by the interference of audio wave. With the help of numerical simulation of sound field formations,the increase or decrease of sound pressure level is analyzed not only by the obstacle, but also by the intruder. Even the microphone is positioned behind the source, sound pressure level can be increased or decreased due to the interference of sound wave. Frequency response test is performed with Gaussian white noise signal to get the whole frequency response from 0 to half of sampling frequency. There are three security cases. Case 1 is the situation of empty space with and without intruder, case 2is the situation of blocking obstacle with and without intruder, and case 3 is the situation of side blocking obstacle with and without intruder. At each case, the frequency response is obtained first at the security space without intruder, and second with intruder. From the experiment, intruder size of diameter of 50 cm pillar can be successfully detected with the proposed technique. Moreover, the case 2 and case 3bring about bigger sound field variation. It means that the proposed technique have the potential of more credible security guarantee in real situation.
- KSP Keywords
- Frequency response, Gaussian White Noise, Intrusion Detection Technique, Numerical simulation(Trnsys16), Sampling frequency, Security cases, Security guarantee, Sound field, Sound pressure level, Sound source, Sound wave