Emergency radio alerting and message transmitting system directable to selected classes and numbers of receivers
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 11, 1990
Grant Date -
N/A
app pub date -
Jul 5, 1988
filing date -
Jul 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Family
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Cited Art Landscape
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