Plethysmographic signal processing method and system
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United States of America Patent
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Issued Date -
Apr 17, 2003
app pub date -
Oct 10, 2001
filing date -
Oct 10, 2001
priority date (Note) -
Abandoned
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Abstract
The present invention provides a plethysmographic signal processing method and system that achieves improved S/N ratios leading to improved patient heart rate estimates and improved plethysmographic waveform displays. The plethysmographic signal processing method and system of the present invention may be implemented using analog and/or digital components within a pulse oximeter. In one embodiment, first and second plethysmographic signals S.sub.1, S.sub.2 associated with first and second wavelengths, respectively (e.g., infrared and red), are received on first and second channels 210, 212. First and second multipliers 214, 216 multiply the first and second plethysmographic signals S.sub.1, S.sub.2 by first and second multiplication factors T.sub.1, T.sub.2. A summer 218 sums the products from the first and second multipliers 214, 216 to output a composite plethysmographic signal C on an output channel 220. The composite plethysmographic signal C may then be displayed and/or utilized to make heart rate determinations and the like.
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