Noise suppression system and method
US5210523A · kind A · utility
5Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Feb 27, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C25/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A broadband transformer with one-to-one turns ratio provides common mode noise suppression in a transmission line. One winding of the transformer is connected in series with each of the two wires of the transmission line. The transmission line is connected between a multiplexer device, coupled in turn to a plurality of spaced-apart fire detectors, and an output fire alarm control panel. Common mode noise on the transmission line results in only a very small noise current appearing at the central fire alarm panel. As a result, a noise rejection for the system is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.