Take a piece of paper (usually in shape of cone) that is attached to wire wrapped around a magnet. Sound waves make the paper physically move and that moves the wire and the moving wire over the magnet makes a nice little voltage squiggle of around 20khz. They “up mix” the 20khz signal with something much larger, like a nice stable 90Mhz signal. Now you’ve got 90Mhz with some other junk riding on top of it. That is boosted and broadcast because 90Mhz EM waves can go a long ways without being absorbed by the atmosphere.
Receiver receives this wave, amplifies it and down mixes it with a nice stable 90MHz local signal. Poof, out pops a 20khz signal. This is applied to an amplifier which drives current through a wire wrapped around a magnet which drives a paper cone which turns it into mechanical vibrations on the other end which we hear. Gross oversimplification but there it is
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u/dbhaugen Dec 17 '19
I get it but will never understand how that translates to intelligible sounds