LogFAQs > #954776423

Xavier_On_High posted...

I've read various articles about technology that uses reflected EM radiation to measure the density of air as sound waves pass through it in order to hear at a distance. Another technology uses lasers to detect vibrations on the glass of the windows of rooms in which conversations are happening.

I think it was speculative, but I can't see any reason why these technologies wouldn't work, though obviously it would be incredibly complicated accounting for interference.

Yeah, I was thinking that the density differential could be used to detect differences in the volumetric components of a sound wave to detect that a sound wave exists (Or rather, the differences in sound waves across an area), but I don't think an EM wave can indicate the other components of sound necessary to distinguish language.

A laser probably could on a physical surface, that sounds perfectly plausible if difficult. It certainly wouldn't make sense for a laser to be emitting a bunch of EM waves though--Anything not cohered into the beam itself is just a waste of energy.

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'Cause you know that I have no fear, ain't gonna walk into the river and disappear. I'm gonna be a powerful man. Red blood running down the broken sand.