A
system is provided for measuring biometric signals, including at least two electrodes, wherein at least one is a capacitive
electrode with a flexible structure, the
system having a circuit for measuring the
voltage between the two electrodes, where in some embodiments both electrodes are
capacitive electrodes, and can be arranged as flexible belts, the
system being suitable for measuring ECG signals and can be configured to measure also
respiratory effort with Respiratory Inductive Plethysmography (RIP) technology, using the same electrodes which are used for measuring capacitively the ECG signals, a method being further provided for measuring biosignals with the system of the invention, the method further including generating an added current
signal with a
signal generator connected to the circuit, where the added
signal has a frequency substantially removed from the frequency of the
biosignal of interest, and by measuring the
voltage signal of the frequency component corresponding to the added current signal one can determine fluctuations in the overall impedance and fluctuations in the
capacitance of the circuit, and correct for fluctuations in the
capacitance to obtain a corrected
voltage signal representing the measured
biosignal.