Rotational-device method and system
US5734579A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1995 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Aug 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H3/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.