I never thought about how a car's radio displays the song title, artist, station name, and other information, but a recent discussion with a friend led to the discovery of the Radio Data System, a standard that was first published in 1984. It uses RDS a 57kHz subcarrier, a frequency higher than the audio. Among the many optional features, if a time and date are included, clocks can keep themselves current. That's a feature used by, for example, an alarm clock that automatically keeps its time current.
The history and lots of details on RDS can be found at the link below.
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