The synthesized voice that broadcasts information on weather radios and the alert tones that precede emergency broadcasts date from the late 1990s. Until then, the alert tone was a steady analog shriek that served only to notify broadcasters and listeners of an incoming message (though in some cases, it was ?only a test?). Since 1997, it has been a set of digital bursts?that nails-on-a-chalkboard noise?containing actual weather information that displays on broadcasters? receiving equipment. The automated voice debuted a year later, allowing weather radio to provide updates in near-real time. Before that, the information was recorded by humans, who could only update the information for one locale at a time. The original electronic voice, described charitably by one meteorologist as ?sounding a bit like Arnold Schwarzenegger,? has undergone tweaks for clarity over the years. It?s designed to pronounce words phonetically for maximum flexibility rather than being preprogrammed to speak certain phrases or word combinations, which is why it can?t match the smoothness of voices such as the iPhone?s Siri.
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