Boots – shoes – and leggings
Patent
1995-08-18
1998-03-31
Voeltz, Emanuel T.
Boots, shoes, and leggings
364508, 39518318, 324 7612, 324 7613, 324 7614, 73659, 73660, 73602, G08B 2100
Patent
active
057345791
ABSTRACT:
A rotational-device test system and method is provided to classify a rotational device according to the type of drive sound thereof. A divider divides the time-series data of an amplitude of the drive sound of an HDD digitized in a converter at intervals of a predetermined time and generates a time-series data group for each frame. An analyzer converts each data item of the time-series data group to a power spectrum. A cycle arithmetic unit selects a maximum point whose self-correlation between a leading frame and each of frames other than the leading frame is maximum, as a candidate point for one cycle of the drive sound, and detects a point whose self-correlation is maximum and which has as a starting point the leading time-series data in the leading frame and the candidate point, and, based on the frame of the candidate point in the detected point whose self-correlation is maximum and on the leading frame, specifies the cycle of the drive sound. A comparator compares a sample having a cycle substantially identical to the cycle of the drive sound of the HDD stored in a storage device and the power spectrum of one cycle by a mutual correlation, and a decision device classifies the HDD based on the result of the comparison.
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Dillon Andrew J.
International Business Machines - Corporation
Russell Brian F.
Vo Hien
Voeltz Emanuel T.
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