Engineers at the Pohang University of Science and Technology, in South Korea, have developed a flexible, wearable vibration sensor that accurately recognizes the user's voice. The sensor is designed to be worn on a person's neck and can recognize a person's voice via the vibration of their skin. Unlike conventional voice recognition sensors, the new sensor is not affected by ambient noise or sound volume. The team's research was recently published in the journal Nature Communications.
“We can get much greater insight into heart health by the synchronous collection of data from both sources,” says lead engineer Nanshu Lu, an associate professor in the departments of Aerospace Engineering and Engineering Mechanics and Biomedical Engineering.
From the Pohang University of Science and Technology article: "The conventional vibration sensors recognize voice through air vibration and the sensitivity decreases due to mechanical resonance and damping effect, therefore are not capable of measuring voices quantitatively. So, ambient sound or obstacles such as mouth mask can affect its accuracy of voice recognition and it cannot be used for security authentication.
In this study, the research group demonstrated that the voice pressure is proportional to the acceleration of neck skin vibration at various sound pressure levels from 40 to 70 dBSPL and they developed a vibration sensor utilizing the acceleration of skin vibration. The device, which is consisted of an ultrathin polymer film and a diaphragm with tiny holes, can sense voices quantitively by measuring the acceleration of skin vibration.
They also successfully exhibited that the device can accurately recognize voice without vibrational distortion even in the noisy environment and at a very low voice volume with a mouth mask worn."
Read more about wearable vibration sensor that accurately recognizes voices at Pohang University of Science and Technology.