Warning method and apparatus and parallel correlator particularly useful therein
US5166664A · kind A · utility
Inventor
Key dates
| Filing date | Aug 2, 1990 |
| Grant date | Nov 24, 1992 |
| Priority date | — |
| Expiry date | Aug 2, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for monitoring a particular location for the occurrence of a predetermined condition, such as fire, smoke, gas, etc., involves continuously transmitting, from a transmitter located at the monitored location, to a receiver, a source of electrical signals at a predetermined repetition rate having a period less than the interval between the electrical signals by at least one order of magnitude, and interrupting the transmission of the electrical signals upon sensing the predetermined condition. For example, the transmitted electrical signals may be coded bursts of pulses having burst periods of the order of milliseconds or nanoseconds, and spaced intervals of the order of seconds. Also, described is a parallel correlator which may be used as the decoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.