| 摘要 |
The RR series, which is constituted by a plurality of samples respectively defining the time intervals between pairs of successive heart beats, is filtered by means of a digital bandpass filter (F<SUB>k</SUB>) presenting a predefined bandwidth [fc, f'c], and preferably by means of an IIR recursive selective filter, and a variability index (I<SUB>k</SUB>) is computed which is a function of the instantaneous amplitude [vs(n)] of the discrete signal (S<SUB>k</SUB>) from said bandwidth filter. The variability index (I<SUB>k</SUB>) is preferably a function of, and in particular equal to, the effective value of the discrete signal (S<SUB>k</SUB>) from the bandpass filter.
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