Finally, True Privacy for Voice Assistants

Speaking is one of the fastest ways to communicate with a computer, but it comes with an obvious drawback: everyone nearby can hear what you are saying. Whether you are dictating notes in a coffee shop, issuing commands on a train, or asking an AI assistant sensitive questions at work, privacy disappears the moment you open your mouth. Researchers have explored everything from lip reading to electromyography (EMG) in an attempt to solve that problem.

Now, a team at a research lab called Aleph has demonstrated a different approach that looks beneath the surface by watching the tongue. Rather than relying on cameras or electrical signals from facial muscles, the system places a small ultrasound probebeneath the speaker's chin to capture video of tongue movements while the person silently mouths words. Those images are then processed by an AI model that reconstructs what was intended to be said without...

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