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It is widely accepted that pulse transit time (PTT), from the R wave peak of electrocardiogram (ECG) to a characteristic point of photoplethysmogram (PPG), is related to arterial stiffness, and can be used to estimate blood pressure. A promising signal processing technology, Hilbert–Huang transform (HHT), is introduced to analyze both ECG and PPG data, which are inherently nonlinear and non-stationary...
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