Band pass filter
US5038328A · kind A · utility
3Cited by
2References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1990 |
| Grant date | Aug 6, 1991 |
| Priority date | — |
| Expiry date | Jun 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/901
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An active, relatively high gain, low power consuming band pass filter circuit centered at approximately 6 KHZ and having a pass band of 100-200 HZ. In a disclosed glass breakage sensor, the filter couples sensed ambient sounds of breaking glass to associated detection, driver and annunciator means. Signals of appropriate duration and frequencies indicative of breaking glass are thereby monitorable to define and induce an alarm condition within a security system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.