Patent ID: 9197976
Filing Date: 2015-11-24
Classification: G08B,H04R

Abstract:
1. A security system based on sound field variation pattern analysis, comprising: a sound field variation detecting apparatus installed within a predetermined surveillance space that receives a sound wave that has been generated by a sound source, and that obtains a sound field variation pattern by comparing an initial acoustic transfer function to a measured acoustic transfer function, and that detects an abnormal situation by reading the sound field variation pattern; and an operation apparatus that receives the sound field variation pattern and that notifies an external apparatus about an emergency situation when the abnormal situation is detected, wherein the sound field variation pattern is obtained by measuring an intrusion determining signal value (signal-to-noise ratio (SNR)) that is a ratio of an initial sound transfer function deviation to a variation value of an acoustic transfer function for a predetermined time period, wherein the sound field variation detecting apparatus periodically resets the initial acoustic transfer function.