Low-power security and intrusion monitoring system and method based on variation detection of sound transfer characteristic

摘要

Disclosed are a method for measuring a acoustic transfer function of a predetermined space to be secured or monitored through a correlation between sound signals acquired from a sound source generating device and a sound measuring device and a method and a system for judging whether there is an intrusion object by using a difference between an initially set acoustic transfer function information and varied acoustic transfer function information by using the method for measuring the transfer function. In the present disclosure, when an object moves or an intrusion object is generated in a predetermined space, intrusion or no intrusion is monitored by variation of the acoustic transfer function varied by the intrusion object even though there is no noise generated by the intrusion object.

主权项

1. A low-power security and monitoring system based on variation measurement of a sound transfer characteristic, the system comprising:
a sound source generating device that outputs a sound wave of an audible frequency band having a predetermined frequency band within a predetermined monitoring space; and a sound measuring device that:
calculates an acoustic wave transfer function, which is a unique characteristic value of the monitoring space and based on the sound wave outputted from the sound source generating device; anddetermines an intrusion into the monitoring space based on a comparison of an acoustic wave transfer function based on the sound wave and measured in a monitoring mode with an acoustic wave transfer function based on the sound wave and measured in an initial setting mode; and wherein, when the sound measuring device determines no intrusion into the monitoring space, the monitoring mode of the sound source generating device switches to a low power mode in which the sound source generating device outputs the sound wave having a lowest voltage level to be able to detect variation in the acoustic wave transfer function, and wherein, when the sound measuring device determines the intrusion into the monitoring space, the monitoring mode of the sound source generating device switches to a high reliability mode in which the sound source generating device outputs the sound wave by increasing a voltage level of the sound wave in a stepwise manner.