METHOD FOR MONITORING ADAPTIVE SOUND FIELD SECURITY OF ENVIRONMENTAL NOISE

摘要

The present invention provides an external noise adaptive sound field security monitoring method. The external noise adaptive sound field security monitoring method of the present invention comprises the steps of: measuring external noise with respect to the security surveillance space, outputting reference sound waves in the security surveillance space to obtain reference sound field information for each frequency from the received sound waves, the security Outputting a security sound wave in the surveillance space to obtain measurement sound field information for each frequency from the received sound wave, and comparing the reference sound field information with the measurement sound field information to determine whether a security alarm situation occurs. The security sound wave may be set to have a frequency in a range in which the influence of the external noise is the least, or to have a sound source having a predetermined size or more compared to the external noise. In addition, the present invention provides a method of consistently setting quantitative judgment reference values of sound field changes that determine whether a security situation occurs without being affected by external noise and measurement conditions.