Security system and method using measurement of acoustic field variation
First Claim
1. 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, andwherein the sound source is configured to generate a pink noise or a white noise in a certain frequency band.
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Accused Products
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.
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Citations
16 Claims
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1. A security system using measurement of acoustic field variation, the security system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A security method using measurement of acoustic field variation, the security method comprising;
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providing a sound source; measuring an initial acoustic field formed by the sound source inside a certain space which includes at least four corners; providing one sound-field variation measuring device in each of the four corners; setting an initial transfer function for the initial acoustic field; measuring a second acoustic field formed by the sound source after the initial acoustic field; calculating a second transfer function of the second acoustic field; and comparing the initial transfer function with the second transfer function to determine whether there is an intrusion inside the certain space, wherein the sound source is configured to generate a pink noise or a white noise in a certain frequency band. - View Dependent Claims (15, 16)
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Specification