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RE: Here's A More Direct Source

Actually, plain old analog FM stereo actually is based on sampled data -- the way it works (in the time domain) is the signal does a bit of Left channel, followed by a bit of Right channel, then Left again, then Right again, swapping between them 38,000 times a second. Then a 19kHz sinewave tone is played right on top of it, which tells the stereo decoder when to shift the signal toward the left or toward the right to separate the channels again. Hence, the sharp cutoff it has at 15kHz, to keep the 19kHz tone out of the speakers and to avoid images from the sampled signal. I know this because my High School science project was to make an FM stereo encoder (which managed to get used on a pirate station or two!).

And, yes, that's ANALOG FM, as started back in the 1960's! Digital FM is of course even more convoluted.
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Edits: 12/10/16
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