Patent ID: 9594163
Date: 2017-03-14
CPC Classifications: G01S,G08B,H04N

Claim:
1. A security surveillance system comprising: a sound generating device configured to output, into a set security surveillance space, a multi-tone sound wave having a plurality of frequency components respectively having a plurality of frequencies; a sound receiving device configured to obtain sound field information for each frequency of the plurality of frequencies, each sound field information including information on a sound pressure and a phase of the corresponding frequency, from a sound wave received in the security surveillance space; and a sound field signal processing device configured to store sound field information for each frequency obtained from the sound receiving device in a preparation mode, to compare the stored sound field information with current sound field information for each frequency obtained from the sound receiving device in a surveillance mode, and to determine occurrence of a security situation, wherein the sound field signal processing device compares a reference sound field information pattern for each frequency with sound field information pattern collected for a predetermined period on occurrence of the security situation, and discriminates whether it is fire occurrence or intrusion occurrence in the security surveillance space, and wherein, after functionally shifting the sound field information pattern for each frequency for a predetermined period towards a high or low frequency, comparing the shifted sound field information pattern with the reference sound field information pattern, and analyzing frequency shift degrees, the sound field signal processing device determines whether fire occurs by detecting a variation speed of a continuous temperature increase by using the analyzed result, and determines an intrusion situation by detecting an aspect that a temperature change does not occur or irregularly occurs.