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Everything about Autofahrer-Rundfunk-Informationssystem

Autofahrer-Rundfunk-Informationssystem was a system for indicating the presence of traffic information in FM broadcasts used by the German ARD network of FM radio stations from 1974. Developed jointly by IRT and Blaupunkt, it indicated the presence of traffic announcements through manipulation of the 57kHz subcarrier of the station's FM signal. Wikipedia →

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