![]() ![]() The ubiquity of news coverage in these situations, such as during the September 11 attacks, has been credited to making usage of the system unnecessary or redundant. Despite this, neither the system nor its predecessors have been used in this manner. Like the Emergency Broadcast System, the system is primarily designed to allow the President of the United States to address the country via all radio and television stations in the event of a national emergency. This design allows for automated station-to-station relay of alerts to only the area the alert was intended for. These signals are read by specialized encoder-decoder equipment. ![]() The last short burst marks the end-of-message. The first signal is the "header" which encodes, among other information, the alert type and locations, or the specific area that should receive the message. Its main improvement over the EBS, and perhaps its most distinctive feature, is its application of a digitally encoded audio signal known as Specific Area Message Encoding (SAME), which is responsible for the characteristic "screeching" or "chirping" sounds at the start and end of each message. ![]() The EAS became operational on January 1, 1997, after being approved by the Federal Communications Commission (FCC) in November 1994, replacing the Emergency Broadcast System (EBS), and largely the Emergency Override System, though the EOS is still used from time to time. The EAS, and more broadly IPAWS, allows federal, state, and local authorities to efficiently broadcast emergency alert and warning messages across multiple channels. However, both the EAS and WEA, among other systems, are coordinated under the Integrated Public Alert and Warning System (IPAWS). Informally, Emergency Alert System is sometimes conflated with its mobile phone counterpart Wireless Emergency Alerts (WEA), a different but related system. The Emergency Alert System ( EAS) is a national warning system in the United States designed to allow authorized officials to broadcast emergency alerts and warning messages to the public via cable, satellite, or broadcast television, and both AM/ FM and satellite radio. Emergency Broadcast System, Local Access Alert ![]()
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