The device, whose development was led by researchers at the University of Cambridge, uses a combination of ultra-sensitive sensors and artificial intelligence to decode speech signals and emotional cues to allow people with post-stroke speech impairment to communicate naturally.

The Revoice device, worn as a soft and flexible choker, captures the wearer’s heart rate and tiny vibrations from throat muscles, and uses those signals to reconstruct intended words and sentences in real time.

The signals from the device are processed by two AI agents: one reconstructs words from fragments of silently mouthed speech, while the other interprets emotional state and contextual information, such as the time of day or weather conditions, to expand short phrases into complete, expressive sentences.