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China ministry describes laser-based technology to reconstruct in-room speech

Reported · Written up by our desk · Trade & Tariffs

South China Morning Post Economy reports that China’s Ministry of State Security described contactless surveillance technology that can reconstruct speech from inside a room by using an invisible laser aimed at a glass window.

According to the report, the technology works by detecting vibrations in the window caused by sound waves, then analyzing the reflected laser signal to interpret what is being said indoors.

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