If you have one of those car receiving set that show FM station call sign right on the display panel , then you have theRadio Data Systemfeature . It was originate bySwedish Telecomin 1976 as a method of sending data to radio pagers . In the early eighties , theEuropean Broadcasting Unionchanged it to the Radio Data System ( RDS ) . TheU.S. National Association of Broadcasters(NAB ) adopted a monetary standard for it in 1993.British Broadcasting System(BBC ) is also a user of the organisation .
The Radio Data System ( RDS ) isavailable in many U.S. cities .
In the United States , FM radio set stations are allocated 200 KHz of bandwidth . ( In Europe , it is 100 kilohertz . ) The station does not fill all of this bandwidth with music . RDS is a completely separateradio signalthat fit within the place ’s frequency allocation . It carries digital info at a frequency of57 KHz , with a data rate is 1187.5 bits per second ( seethis skillful diagram of the FM signalfor details ) . RDS transmits data simultaneously with a stock FM stereoscopic picture ( or monophonic ) wireless broadcast . Possible usage include send birdsong deed of conveyance , station call signs , and point when dealings or weather account are being broadcast .
RDS was mentioned inthis BBC articlethat describes how a " plagiariser " radio set station was able-bodied to ship out a signaling that " choose over " many wireless . On some railcar tuner , there is no easy way to disable RDS – the only way to make the job go forth was to drive out of mountain range of the offending signal .
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