How do radio stations transmit information about songs?

Question

I think I got the right flair. I understand how the audio signal is transmitted but I am baffled how the radio can display a song title, artist etc to the screen. I’ve seen this on car stereos mostly but I assume other devices can do it.

In: 11

Answer 1

It’s a tech called Radio [Data System (RDS)](https://en.wikipedia.org/wiki/Radio_Data_System).

Basically, there’s some room in FM broadcast signals for things other than 20Hz-20kHz audio, so RDS was conceived as a standard for transmitting some simple text in a specific portion of that unused bandwidth.