Radio is all digital now, even from your car’s stereo. the audio you hear is transmitted as data.
The huge benefits of transmitting data instead of sound is that you can compress it, so you can use less radio power to transmit, and add correction algorithms, so that even if the signal is weak and losses occur, the receiver can “regenerate” what was emitted.
While there are many emitters everywhere now, the signal power used has decreased a ton. There is way less RF power around people and homes now than 40 to 70 years ago.
Jason_Peterson here describes how it was encoded before FM was used, on the AM band.
Edit: for all the downvoters around, I am talking about DAB.
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