Fig. 1From: Highly wearable cuff-less blood pressure and heart rate monitoring with single-arm electrocardiogram and photoplethysmogram signalsThe proposed system for wearable cuff-less SBP and HR monitoring with single-arm-ECG and PPG signals. R/B/S represent the reference/bias/signal electrodes used for single-lead ECG signal measurement, respectively, P corresponds to the reflective PPG sensor; PTT pulse transit time, HB heartbeat, HR heart rate, SBP systolic blood pressureBack to article page