Photoplethysmographics using component-amplitude division multiplexing

Abstract From the Canadian patent

Photoplethysmographics Using, Component-Amplitude-Division Multiplexing 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 …