TV sound was orginally to be AM. But just after WW2 the FCC decided to bump up the scan rate from 441i to 525i, and make the sound FM. Which annoyed David Sarnoff of RCA no end, as that would require RCA to pay licensing to Armstrong, the guy who invented/developed FM. But the FCC was correct in mandating FM sound for TV, AM would have sounded like crap, with much interference from the video sidebands of the TV signal.
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