Method for ambient light subtraction in a photoplethysmographic measurement instrument
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United States of America Patent
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Sep 21, 1999
Grant Date -
N/A
app pub date -
Mar 24, 1997
filing date -
Mar 24, 1997
priority date (Note) -
Expired
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Abstract
An improved photoplethysmographic measurement system is disclosed in which a portion of a time division multiplexed (TDM) signal represents an ambient light level, and other TDM signal portions represent detected levels of two or more centered wavelengths of transmitted light. The ambient and detected light portions of the signal are simultaneously applied to the inputs of an instrumentation amplifier(s) so as to produce a continuous output voltage that is proportional to a difference in voltage between the ambient and detected light portions of a TDM signal. Such an approach provides for ambient light level subtraction with reduced noise and componentry.
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