Photoplethysmographics using component-amplitude division...

Details Photoplethysmographics using component-amplitude division... Photoplethysmographics using component-amplitude division...

A - Human Necessities

61

B

A61B 5/02 (2006.01) A61B 5/00 (2006.01)

Patent

CA 2062249

Photoplethysmographics Using Component-Amplitude-Division Multiplexing Abstract A plurality of carrier signals, distinguishable by amplitudes of signal components (e.g., frequency compo- nents), 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 wave- length may be determined. The carrier signals may com- prise time-varying periodic signals with identical fre- quency and frequency components, such as mixtures of identical sets of pure sine waves. When the number of signal components exceeds the number of emitter wave- lengths, sufficient information is provided during demul- tiplexing to detect and correct errors introduced by ambient light source and other interference.

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