Measurement system having pole zero cancellation
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United States of America Patent
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-
Apr 7, 1981
Grant Date -
N/A
app pub date -
Jan 29, 1979
filing date -
Jan 29, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulse IR reflectance plethysmograph system for heart rate measurement and display in a digital watch or as a medical instrument having a novel direct coupled pole zero cancellation circuit that compensates undesirable shaping effects on the heart blood pressure wave. The system utilizes a pulsed LED light emitting diode for transmitting light pulses and a photodiode for receiving light pulses reflecting from a finger.
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