RFID Tattoo: A Wireless Platform for Speech Recognition
summary
A wearable system of wafer-thin, skin-friendly batteryless RFID tattoos senses millimeter-scale facial skin stretch by tracking resonant frequency shifts (1 mm stretch → ~8 MHz) using tags with multiple chips to cover a wide range beyond the 26 MHz reader hop limit. A portable RFID reader captures signals, a classifier maps stretch patterns to gesture sequences, and an NLP model reconstructs words achieving 86% accuracy on the top-100 English words with a 10-user study.
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