Emergency alert system
Today's technology makes it possible to anticipate or to be aware of and track the progress of various "emergencies" and "disasters" or impending disasters such as tornadoes, chemical spills, forest fires, floods, and etc. Though authorities have access to the information about the disaster or an emergency, it is often difficult to disseminate the information to that portion of the public which might be affected by the emergency. Thus, emergency alert systems (EAS) have been developed to warn citizens of dangerous conditions which may exist due to chemical or nuclear plant accidents, fires, floods or other disaster. Use of existing telephone networks for these alarm systems allows the warning authority to reach a large cross section of the affected population. Emergency alert systems may utilize the central office switch to dialup each customer to be warned. Telephone networks provide effective and cost efficient media for the transfer of signals which may be used to activate an alarm at the subscribers location. In a subscriber television system, an emergency alert system is used to warn subscribers of severe weather or of national emergencies. Upon receiving an emergency alert message, the subscriber television system must integrate the message into the television signal for delivery and display to the subscribers. EAS utilizes audio frequency shift keying (AFSK) to send a data signal on a broadcast station's main audio channel. The utilization of AFSK allows EAS to send data to unattended stations. The EAS equipment receives a message, interrupts a station's regular programming, sends the alert warning, and then automatically returns the station to normal programming.
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