Emergency radio alerting and message transmitting system directa

Details Emergency radio alerting and message transmitting system directa Emergency radio alerting and message transmitting system directa

1988-07-05

1990-09-11

Olms, Douglas W.

Telecommunications

Carrier wave repeater or relay system

Portable or mobile repeater

455 53, 455228, 455 38, H04B 714, H04B 724

Patent

active

049568752

ABSTRACT:
An emergency radio alerting and warning system comprising an FM transmitter having first and second encoding means, the first encoding means enabling the selection of all receivers in a given location, and the second encoder to enable broadcasting to be made to particular receivers in the selected location. The transmitter broadcasting signals with the encoded signals being followed by signals to cause audible alarms being sounded at the receivers so encoded, and then causing the messages being over loudspeakers at the selected receivers. The FM receivers being receptive but inactive until an encoded signal specific to that receiver being received, and then fully activating the receiver to sound an audible alarm to alert persons in the vicinity, and then to have the message broadcast. Timing means are present to terminate any message to the receiver after a given period unless extended by repetition of the coded signal by the transmitter.

REFERENCES:
patent: 4392248 (1983-07-01), Eckels et al.
patent: 4449248 (1984-05-01), Leslie et al.
patent: 4476488 (1984-10-01), Merrell
patent: 4633515 (1986-12-01), Uber et al.

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