Furthermore, even if your fillings could act as a demixer, they would be much too small to act as a great antenna to receive signals in the AM band.
This is what makes receiving AM signals through your teeth impossible-your teeth fillings CANNOT DO THIS because it requires a somewhat sophisticated circuit to do this. On your radio, this is what happens when you tune it, it chooses a particular frequency to "de-mix" (not the right term, but essentially captures what's happening) the received air signals, and only the baseband signal on that carrier you tunes to will de-mix properly. Once you you receive this signal, you have to undo the frequency shift on your received signal to recover the original information. This is necessary because the frequencies at which natural sounds (baseband) are generated are not easily transmitted or received via electromagnetic waves, while these higher frequency signals are (carrier+baseband). The process of mixing the waves together creates a new wave that is essentially the old wave frequency shifted by the carrier wave. The frequency band needed for sound waves is roughly 20-20Khz, but AM radio only uses something like 40-4KHz. This is impossible, but the real explanation for why is as about as difficult as explaining how magnets work-you really need to have some understanding of the fundamentals of Fourier Analysis to understand what I'm even talking about here.ĪM radio works by "mixing" a carrier signal with another signal, typically called the baseband signal (typically encoding the content of interest).
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