APPARTUS AND METHOD FOR MONITORING SECURITY USING VARIATION OF CORRELATION COEFFICIENT PATTERN IN SOUND FIELD SPECTRA

摘要

A security monitoring method according to the present invention includes the following steps: outputting a multi tone sound wave constituted with a linear sum of a sine wave having a plurality of frequency components into a security monitoring space; calculating a sound field from the multi tone sound wave received in the security monitoring space; storing reference sound field information per frequency through the sound field; calculating current sound field information per frequency, and then judging occurrence of sound field variation by comparing the reference sound field information per frequency with the calculated sound field information; and discriminating at least two situations among invasion, movement and temperature variation situation on the basis of correlation between a reference sound field spectrum and a continuous sound field spectrum, by analyzing the sound field variation occurrence collected during a fixed period.