Abstract
Part 1 of the paper was dedicated to some general aspects of h.r.v. measurements. In Part 2, the spectral properties of the integral pulse frequency modulator (i.p.f.m.) are shown. The choice of a hardware device for lowpass filtering the cardiac event series by means of a stepwise convolution is discussed. A method to overcome the problems of distortion due to spurious spectral components in the filter passband is shown. The hardware realisation of the filter is described and results are given.
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