Techniques for accurately deriving physiologic parameters of a subject from photoplethysmographic measurements
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United States of America Patent
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Oct 30, 2012
Grant Date -
Jul 10, 2008
app pub date -
Jan 10, 2008
filing date -
Jan 10, 2007
priority date (Note) -
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Abstract
Several techniques are disclosed for isolating either heart or breath rate data from a photoplethysmograph, which is a time domain signal such as from a pulse oximeter. The techniques involve the use of filtering in the frequency domain, after a Fast Fourier Transform (FFT) has been conducted on a given photoplethysmograph also references as a given set of discrete time-domain data. The filtering may be applied to an identified fundamental frequency and one or more harmonics for heart related parameters. The filter may be truncated to the frequency data set and further applied multiple times to improve roll off. After filtering, an Inverse FFT (IFFT) is used to reconstruct the time-domain signal, except with undesirable frequency content eliminated or reduced. Calculation or measurement of parameters is then conducted on this reconstructed time-domain signal.
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