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Sneaky US Navy feedback device could stop people being able to speak

Sneaky US Navy feedback device could stop people being able to speak

A sailor in the US Navy uses a long-range acoustic device during a drill

David Wa / Alamy

A non-lethal device developed by the US Navy aims to surreptitiously render a person unable to speak.

The device, called a handheld acoustic hailing and disruption (AHAD) system, records a target’s speech with a long-range microphone and plays it back to them with a tiny delay. As anyone who has spoken on a phone or internet call that echoes their voice back at them will know only too well, such delayed auditory feedback can be highly disruptive …

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