Fig. 1: Infrasonic hemodynography earbud system.

a Exploded schematic illustration of the IH earbuds, interconnect schemes, and enclosure architectures. b Person wearing the IH earbuds; the earbuds have passive sensors/microphones installed on the left and right side. c Illustrative example of IH signal collected alongside and synchronized with ECG. The person in the photograph wearing the earbuds consented to the taking and publication of the photograph.