Measurement system having pole zero cancellation

Details Measurement system having pole zero cancellation Measurement system having pole zero cancellation

1979-01-29

1981-04-07

Michell, Robert W.

Surgery

Truss

Pad

128690, 307311, 328 2, H03K 500

Patent

active

042609518

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.

REFERENCES:
patent: 3657669 (1972-04-01), Proakis
"Infrared Sensor Built into Watch Measures Wearer's PR", (Anon), Electronics Review vol. 50, No. 9, Apr. 28, 1977.
Guillermin, E. A., "Synthesis of Passive Networks", John Wiley & Sons, Inc., New York, 1957. pp. 86, 232, 521-522.
Nowlen, C. H. et al., "Elimination of Undesirable Undershoot in the Operation & Testing of Nuclear Pulse Amplifiers," The Review of Scientific Instr., vol. 36, No. 12, Dec. 1965, pp. 1830-1839.

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