Phys.org June 24, 2019
Conventional vibration sensors recognize a voice through air vibration and the sensitivity decreases due to mechanical resonance and the damping effect, therefore they are not capable of measuring voices quantitatively. Researchers in South Korea developed a device which consists of an ultrathin polymer film and a diaphragm with tiny holes that can sense voices quantitively by measuring the acceleration of skin vibration. They demonstrated that the voice pressure is proportional to the acceleration of neck skin vibration at various sound pressure levels from 40 to 70 dBSPL. This research can be further extended to various voice-recognition applications such as electronic skin, human-machine interface, or wearable vocal healthcare monitoring device…read more. Open Access TECHNICAL ARTICLE
Schematic image of the comparison between the device and a reference microphone for voice authentication and voice-controlled applications. Credit: POSTECH