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Originally posted by Tom Bedlam
Oh, sorry, wrong replies then.
The whole ELF thing has such a lot of oddball baggage attached it's amazing to me. Especially when the information capacity of the channel is so small.
Do you think people become violent, sleepy, aggressive et al when lightning strikes nearby? That's a MUCH larger signal, and a shotgun of frequencies to boot.
I guess what's funny is the people that think you can send high-def color movies over ELF. To single targets.
It takes a non-linear function, typically a semiconductor junction - you have to multiply the sidebands and the carrier together to recover the original audio. You can use a multiplier but a diode junction "exposes" a multiplication in its I-V curve.