Re:Spies can eavesdrop by watching a light bulb's vibrations
by jamesgeck0 on Monday July 27, 2020 @06:17PM
(#23970061)
> Think about it - a hanging light bulb vibrates when you speak... Really? I don't see any movement, and I'm right there.
I don't see any movement on my computer speakers or mic when they're emitting or receiving sound, but they wouldn't function if vibration wasn't happening. You can measure the vibrations from a short distance away with a laser setup that costs about $300 IIRC.
So the basic concept is sound. After that it's just a question of what kind of measurement setup a government agency with absurd amounts of time and money could cook up.
I don't see any movement on my computer speakers or mic when they're emitting or receiving sound, but they wouldn't function if vibration wasn't happening. You can measure the vibrations from a short distance away with a laser setup that costs about $300 IIRC.
So the basic concept is sound. After that it's just a question of what kind of measurement setup a government agency with absurd amounts of time and money could cook up.