Your Smart Speaker Can “Hear” Your Heartbeat!
summary
A prototype uses commodity smart speakers and FMCW chirps plus microphone capture to extract submillimeter chest motion, cancels random system transmission delay with a virtual-transmit mix, separates respiration and heartbeat via time‑frequency decomposition, and segments beats with an EM-based algorithm. System achieves real-time contact-free heart monitoring on consumer hardware with Amazon Echo, a median heart rate estimation error of 0.75 bpm, and a median heartbeat interval estimation error 13.28 ms.
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