Circuit arrangement for monitoring noise levels of detectors arranged in an alarm installation
US4598271A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1984 |
| Grant date | Jul 1, 1986 |
| Priority date | — |
| Expiry date | Feb 21, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/22
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The circuit arrangement generating at least one noise-level warning threshold monitors the noise-level of detectors in an alarm system. The noise-level warning threshold assumes a fixed relation to the operating or working point level of the signal transmitted by the detector of the alarm system while taking into account shifts in the level of the operating or working point. An alarm storage or buffer disposed in the detector is set without transmitting an alarm signal when the noise-level warning threshold has been exceeded. The noise-level is monitored during normal operation and gives sufficiently early warning of a tendency to generate false alarms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.