Fire detector and noise de-influence method
US6329922A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2000 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Jul 24, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B17/107
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
It is prevented that a malfunction occurs because of a noise. A smoke detection section samples as a smoke detection signal a signal digitized after being output from a light reception section when a light emission section glows, and updates a previous smoke detection signal. A noise detection section samples as a noise detection signal a signal output from the light reception section when the light emission section is not driven to glow. When the noise detection signal exceeds a predetermined noise level, a noise de-influence unit disables updating of the previous smoke detection signal with the newly sampled smoke detection signal so as to process a noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.