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Speaker 1: today's question, how's your radio able to display the station's
Speaker 1: call letters and things like song titles on the radio's display.
Speaker 1: If you have one of those radios that show FM
Speaker 1: station call signs right on the display panel, then you
Speaker 1: have what's called the radio data system feature with your radio.
Speaker 1: The Radio Data System or RDS, is available in many
Speaker 1: US cities. There's a similar system in Europe as well.
Speaker 1: In the United States, each FM radio station is allocated
Speaker 1: two herds of bandwidth. So if a radio station is
Speaker 1: at ninety three point one on the FM dial, its
Speaker 1: frequency is ninety three point one million herds, and it
Speaker 1: has between ninety three point one and ninety three point
Speaker 1: three million hurts as its allocation. The station doesn't fill
Speaker 1: all that bandwidth with music there's some space left over
Speaker 1: on both sides. RDS is a completely separate radio signal
Speaker 1: that fits between the station's frequency allocation. It's like there
Speaker 1: are actually two radio stations broadcasting. One has music and
Speaker 1: the other has data. The RDS signal carries digital information
Speaker 1: with a data rate of about eleven hundred bits per second.
Speaker 1: RDS transmits data simultaneously with a standard FM radio broadcast.
Speaker 1: Your radio picks up the music and sends it to
Speaker 1: the speakers, and then it separately picks up the data
Speaker 1: signal and sends that data to the display. Possible uses
Speaker 1: include transmitting song titles, station call signs, and signaling when
Speaker 1: traffic and weather reports are being broadcast. For more on
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