Photoplethysmographics using energy-reducing waveform shaping

Details Photoplethysmographics using energy-reducing waveform shaping Photoplethysmographics using energy-reducing waveform shaping

A - Human Necessities

61

B

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

Patent

CA 2062244

Photoplethysmographics Using Energy-Reducing Waveform Shaping Abstract A method of energy-reducing waveform shaping of carrier signals in a photolethysmographic system, in which a carrier signal may comprise a time-varying peri- odic waveform comprising a sum of carrier components. The carrier signal has its energy reduced by adding additional carrier components, which reduce the energy envelope for a period of the carrier signal, while preserving the sig- nal information. The method of energy-reducing waveform shaping may be coupled with frequency-division multiplexing, and more generally with any method of multiplexing which employs a time-varying periodic carrier signal. Redundant information may be used for error detection and correc- tion. A plurality of carrier components may be chosen which reduces the energy envelope for a period of the car- rier signal, and which employs more carrier components than needed to perform the preferred form of multiplexing and demultiplexing of the modulation effects introduced by a tissue section of the patient. Majority voting of car- rier components may then provide for error detection and correction.

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