Unconstrained Monitoring of Heartbeat and Respiration Using an Acoustic Sensor

Abstract

The authors previously developed an unconstrained and noninvasive measurement system which measured the continuous trends of the instantaneous heartbeat and respiration periods using an acoustic sensor. The paper improves the method such that it outputs the periods of the heartbeat and respiration discretely in time quite similarly as the electrocardiograph and thermistor-type respiration pick-up used as standard devices. The validity of the proposed system is shown by experiments.