Spies Can Eavesdrop by Watching a Light Bulb's Vibrations. The so-called "lamphone" technique allows for real-time listening in on a room that's hundreds of feet away.
What a clever idea - since a light bulb filaments is a precarious tiny mobile wire when the bulb is lit, it would respond to sound vibrations in the room and slightly change its light output. This spy technique measures those slight variations to detect and reproduce sounds from afar. https://www.wired.com/story/lamphone-light-bulb-vibration-spying/
It reminds me of this technique, tested in this video with "home" equipment, that detects vibration of objects in the room by reflected laser light and uses that to extract audio from a remote source.
No comments:
Post a Comment