“Your Android phone can be turned into a microphone without your permission or knowledge. All that’s needed are the gyros in your phone that measure orientation. Stanford researchers have shown how to rewire them to pick up sound waves.
Together with the defense firm Rafael, they created an Android app called Gyrophone, which shows just how easy it is to get the vibrating pressure plates used by the gyroscope to pick up vibrations of sound at frequencies in the 80-250Hz range – the base frequencies of the human voice. “
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