Abstract
The purpose of this study is the measurement of vital signs during sleep. Although there are many commercially available devices to measure vital signals, we present a system to detect heart beat and breathing rate during sleep using a sheet-shaped pressure sensor and signal processing, which allows for unsupervised and continuous measurement of vital signs. At this moment, smoothed signal root mean square autocorrelation for the heart beat and autocorrelation FFT peak positioning for the breathing rate are the methods used in the signal processing part. The experimental results from 3 subjects lying down in supine position are validated, and then compared to results measured by a respiration transducer and a pulse oximeter. For all subjects, the relative error of the breathing rate is less than 10%, and of the heart beat is less than 3%.
