ABNORMALITY DETECTING DEVICE, ABNORMALITY DETECTION METHOD, AND ABNORMALITY DETECTION COMPUTER PROGRAM
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United States of America Patent
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Issued Date -
Jun 13, 2019
app pub date -
Dec 5, 2018
filing date -
Dec 7, 2017
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Abstract
An abnormality detecting device includes a processor coupled to a memory and configured to: detect an envelope of a sound signal representing a periodic sound emitted from the rotor including a predetermined number of blades and a periodic sound emitted from another object; perform a time frequency transform of the envelope for each of frames having a predetermined time length and calculate a frequency spectrum of the sound signal; detect a candidate of a frequency equivalent to a period of the sound emitted from the rotor; and obtain a duration in which a fluctuation in power with respect to power of a component of the frequency spectrum in the candidate detected with regard to the frame becomes lower than or equal to a certain level and identify the candidate in which the duration becomes longest as the frequency equivalent to the period of the sound emitted from the rotor.
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