Signal decision system
US4165458A · kind A · utility
21Cited by
5References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 1977 |
| Grant date | Aug 21, 1979 |
| Priority date | — |
| Expiry date | Apr 14, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/001
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrical signal originating from an abnormal sound is passed through a bandpass filter and compared with a reference signal by a comparator. When the electrical signal is not less than the reference signal, the comparator produces a pulse. A counter counts the pulses from the comparator and causes a display device to display the presence of the abnormal sound when its count exceeds a predetermined value within a predetermined time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.