Source: Hackaday
Researchers have demonstrated that ultrasound vibrations on the skin can capture speech patterns invisible to microphones, addressing a real privacy problem as voice interfaces become ubiquitous in homes and workplaces. The technique reads subvocal muscle movements through ultrasound, creating a communication channel that doesn't broadcast words to always-listening speakers, transcription services, or ambient surveillance. As voice becomes the default input method for smart devices and AI assistants, this offers users a way to gain convenience without surrendering privacy.