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Lamp Phone, now even your light bulbs make it easy to ease drop on you!
https://techxplore.com/news/2020-06-bulb-vibrations-yield-eavesdropping.html
@mikelga From what I can tell it is measures by fluctuations in the brightness of the bulb.
Doppler shift of light would be imperceptible at those speeds.
@freemo that was my first thought. Ot is very interesting. Pherhaps, one day will try it with my neighbours.
Thank you!
@freemo Wow! Is it true?! What do we have to measure to have that sound? Brightness variation due to the bulb's oscillation provoqued by differential emiting angle of the bulb? Or is it the frequecy change due to the Doppler's effect?