An experimental system for the waveform recognition of impedance plethysmography

An impedance waveform recognition system is developed which can perform both cardiac and pulmonary waveform recognition in a single system. The basic structure of the system is outlined, with special attention to the recognition of the four physiological signals: electrocardiogram, dz/dt, Delta Z, and phonocardiogram. Good agreement has been between measurements made by the system and by doctors. >