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Intrusion Detection Based on the Sound Field Variation in Audible Frequency - Broadening Security Area
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- Authors
- Sung Q Lee, Kang-Ho Park
- Issue Date
- 2015-07
- Citation
- International Congress on Sound and Vibration (ICSV) 2015, pp.1-8
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, intrusion detection technique based on the sound field variation of audio frequency is proposed. In previous research, the feasibility of the proposed detection algorithm was verified in the anechoic room in 2012, and was verified experimentally in general sound space in 2013. Based on the customer's requirement of broadening the security space, in this paper, the sound source manipulation technology is proposed. In general, sound space such as the office room and the conference room, there are sound reflections and reverberation that make the interference of the sound more complex. The multi-tone sound source composed of sine waves with evenly spaced frequencies is employed. The multi-tone is modulated as the sound source, and the room transfer function is calculated first at the security space without the intruder, and second with the intruder. Through the difference between room transfer functions, it is possible to detect the intrusion. The security sensor module has two speakers with the distance of 30 cm and one microphone in between two speakers. Speakers make the multi-tone sound to the security space and a microphone detects the reflected sound simultaneously. Multi-tone sound source is manipulated for two speakers with difference phase and magnitude that makes more complex reflections in security space, so that it is possible to detect the intrusion with higher sensitivity than single or mono speaker module. As a result, the security space is broadened in to 5m x 5m. This results show the potential of commercialization of intrusion detection in general spaces such as offices and living room.
- KSP Keywords
- Detection algorithm, Higher sensitivity, Intrusion Detection Technique, Living room, Manipulation technology, Office room, Phase and magnitude, Room transfer function, Security area, Sensor module, Sound field