Photoplethysmographics using component-amplitude-division multip

Details Photoplethysmographics using component-amplitude-division multip Photoplethysmographics using component-amplitude-division multip

1991-03-05

1994-09-27

Cohen, Lee S.

Surgery

Truss

Pad

128666, 36441303, A61B 500

Patent

active

053499530

ABSTRACT:
A plurality of carrier signals, distinguishable by amplitudes of signal components (e.g., frequency components), are respectively applied to a plurality of energy emitters (e.g., infrared and red light emitters). A detector receives the sum of the energy after modulation at each emitter wavelength, e.g. by blood tissue of a patient. An output of the detector is then demultiplexed, whereby a component of modulation at each emitter wavelength may be determined. The carrier signals may comprise time-varying periodic signals with identical frequency and frequency components, such as mixtures of identical sets of pure sine waves. When the number of signal components exceeds the number of emitter wavelengths, sufficient information is provided during demultiplexing to detect and correct errors introduced by ambient light sources and other interference.

REFERENCES:
patent: 4653498 (1987-03-01), New, Jr. et al.
patent: 4908762 (1990-03-01), Suzuki et al.

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