METHOD FOR DETERMINING ALCOHOL USE BY COMPARISON OF HIGH-FREQUENCY SIGNALS IN DIFFERENCE SIGNAL, AND RECORDING MEDIUM AND DEVICE FOR IMPLEMENTING SAME
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Abstract
This method for determining alcohol use comprises the steps of: detecting an effective frame in an input audio signal; detecting a difference in signal within the original signal of the effective frame; performing a fast Fourier conversion on the difference signal to be transformed into a frequency domain; detecting high-frequency components within the difference signal subjected to the fast Fourier transform; and determining the state of alcohol use on the basis of a gradient difference between the high-frequency components. Accordingly, the present invention can identify the state and extent of alcohol use by a driver or an operator from a long distance and thus can prevent accidents caused by driving or operating vehicles and machines under the influence of alcohol.
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Citations
35 Claims
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1-15. -15. (canceled)
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16. A method for determining whether a person is drunk comprising:
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forming an effective frame of an input voice signal from said person; generating an original signal of the formed effective frame and a difference signal of the original signal; converting the difference signal into a frequency domain signal by performing a fast Fourier transform algorithm on the difference signal; detecting high-frequency components of the fast-Fourier-transformed difference signal; and determining whether said person is drunk based on slope differences among the high-frequency components. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A device for determining whether a person is drunk comprising:
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an effective frame detection unit configured to detect an effective frame of an input voice signal from said person; a difference signal detection unit configured to detect a difference signal of an original signal of the effective frame; a Fourier transform unit configured to convert the difference signal into a frequency domain signal by performing a fast Fourier transform on the difference signal; a high-frequency detection unit configured to detect high-frequency components of the fast-Fourier-transformed difference signal; and an alcohol consumption determination unit configured to determine whether said person is drunk based on slope differences among the high-frequency components. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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Specification