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The band pass filter is used to attenuating breathing originated signal from the heart originated BCG signal. The bandwidth of the both signals slightly overlap, hereby the complete attenuation of the breathing is not possible without also altering the heart originated BCG waveforms and the parameters which are obtained from the BCG. In our study we investigated the optimal lower cut-off frequency, and 1.3 Hz was found as the reasonable compromise between the attenuation of the breathing and the altering of the heart originated

INFLUENCES OF DIGITAL BAND-PASS FILTERING ON THE BCG WAVEFORM