Glass break detection with noise riding feature
US5438317A · kind A · utility
10Cited by
8References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Apr 8, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/1672
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a glass break detector, noise is removed by averaging the signal before it is analyzed for the characteristics that typically accompany glass breaking events. Low frequency signals, associated with glass flexing before it shatters, are isolated from repetitive or symmetrical noise in the same frequency range to increase the signal-to-noise ratio of the detector, improving sensitivity to valid glass breaking events and reducing false alarms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.