Frequency-selective acoustic and haptic smart skin for dual-mode dynamic/static human-machine interface
Jonghwa Park, Donghee Kang, Hee Young Chae, Sujoy Kumar Ghosh, Changyoon Jeong, Yoojeong Park, Seungse Cho, Youngoh Lee, Jin‐Young Kim, Yujung Ko, Jae Joon Kim, Hyunhyub Ko
Abstract
Accurate transmission of biosignals without interference of surrounding noises is a key factor for the realization of human-machine interfaces (HMIs). We propose frequency-selective acoustic and haptic sensors for dual-mode HMIs based on triboelectric sensors with hierarchical macrodome/micropore/nanoparticle structure of ferroelectric composites. Our sensor shows a high sensitivity and linearity under a wide range of dynamic pressures and resonance frequency, which enables high acoustic frequency selectivity in a wide frequency range (145 to 9000 Hz), thus rendering noise-independent voice recognition possible. Our frequency-selective multichannel acoustic sensor array combined with an artificial neural network demonstrates over 95% accurate voice recognition for different frequency noises ranging from 100 to 8000 Hz. We demonstrate that our dual-mode sensor with linear response and frequency selectivity over a wide range of dynamic pressures facilitates the differentiation of surface texture and control of an avatar robot using both acoustic and mechanical inputs without interference from surrounding noise.