Voice-override alarm system
US4703312A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1986 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Aug 22, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An emergency alarm system incorporating both signal generation and voice annunciation capabilities, for installation in a building or other structure. The system includes a standard fire alarm control panel and one or more loud speakers, each speaker having a series blocking capacitor. The panel has conventional supervisory circuitry and sensing/alarm terminals connected therewith, adapted to indicate an alarm condition when conditions warrant, as by signals received on multiple sensor lines that also communicate with the panel. A signal generator and amplifier are arranged to drive the speakers, under alarm conditions. There is provided a circuit-failure indicator including an electrical switch and an electro-responsive actuator device connected with the signal generator. The electro-responsive actuator device, when energized by the signal generator, maintains the switch in a closed-circuit condition. An electrically conducting loop circuit is connected with the sensing/alarm terminals of the fire alarm control panel, the loop circuit involving the two speaker lines and a d.c. conducting shunt. The electrical switch is connected in series in the loop circuit whereby failure of eit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.