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jascii
on July 27, 2020
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Spies can eavesdrop by watching a light bulb's vib...
Ultrasonic buzzers? I kinda fail to see how that would help, shouldn't be too hard to filter out the ultrasonic range noise.
noir_lord
on July 27, 2020
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Not if it's random.
It's the vibrations from sound on glass they want and those are tiny by comparison to the input.
Zenst
on July 27, 2020
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Basically drowns out the room vibrations upon the window as it is a in direct contact. You can make your own with piezo discs and small circuit to drive them. That and high frequency will not cause added noise noticeable to humans.
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