Don’t forget about AM Radio. There is some magic there I hope we can still harness for the future.
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AM modulation can't exclude interfering signals because it just reacts directly to signal strength. FM works by defining the volume level with a pair of frequencies that slide up and down to define high and low signal on the speakers. so interference that isn't tuned to the FM resonator won't come out in the output.
for the most part, all that happens with interference to AM is it loses the stereo signal. yes, the left/right is also modulated the same way, with another rising and falling high frequency defining left and right panning.
*fm
and yeah, fm stereo only arrived in the late 70s also, after the inventor of FM suicided.
anyhow, AM is for sound. not data. you can modulate digital bits over sound but radio digital signal systems use even more advanced tricks to get around interference, error correction algorithms, spread spectrum
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