Frequency processing of an RR series in an analogue cardiac signal
US7899523B2 · kind B2 · utility
1Cited by
9References
12Claims
0Family size
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Key dates
| Filing date | Apr 16, 2003 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Jan 4, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/364
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The RR series, comprising a number of samples respectively defining the time interval between two successive heartbeats, is filtered by means of a digital band-pass filter (Fk), having a given band-pass [fc; f′c] and preferably by means of a recursive elective filter (RII). A variability index (Ik), is calculated which is a function of the instantaneous amplitude [vs(n)] of the discrete signal (Sk) coming from said band-pass filter. The variability index (Ik) is preferably a function of and particularly equal to the effective value of the discrete signal (Sk) from the band-pass filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.