US 8,797,407 B2 · Security system and method using measurement of acoustic field variation

Abstract

A security system and a method of determining whether there is an intrusion are provided. A correlation between sound signals obtained from a sound source generating device and a sound-field variation measuring device is used to measure a acoustic field in a certain space. A difference between an initially set acoustic field and a changed acoustic field is used to determine whether there is an intruding object in a certain space. The security system includes a sound source generating device for generating a sound source; and a sound-field variation measuring device for measuring a acoustic field formed by the sound source, wherein an initially set acoustic field is compared with the measured acoustic field to determine whether there is an intrusion.

Claims16

Dependent claims

A security system using measurement of acoustic field variation, the security system comprising:

a sound source configured to generate an acoustic field;
and
a plurality of sound-field variation measuring devices configured to measure an acoustic field formed by the sound source inside a certain space including at least four corners, and to compare the measured acoustic field with an initially set acoustic field to determine whether there is an intrusion in the certain space,
wherein the plurality of sound-field variation measuring devices include at least four sound-field variation measuring devices respectively disposed in the four corners of the certain space, and
wherein the sound source is configured to generate a pink noise or a white noise in a certain frequency band.

2 more elements

Dependencies are inferred from the claim text.

Security system and method using measurement of acoustic field variation

Life of this patent

Security system and method using measurement of acoustic field variation

Life of this patent

Abstract

Claims16