Activation circuit for battery-operated security alarm detection system
US5254897A · kind A · utility
6Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1992 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Oct 7, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The present invention relates to an activation circuit for a battery-operated security alarm detection system where current drain and, therefore, battery life is of concern. It employs a non-current drawing piezo element which only sees part of the frequency band of interest to briefly activate or wake up a current-drawing electret microphone which has a bandwidth broad enough to sees the entire audio band of interest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.