Importance

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Abstract

A method of energy-reducing waveform shaping of carrier signals in a photoplethysmographic system, in which a carrier signal may comprise a time-varying periodic 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 signal information. The method of energy-reducing waveform shaping may be coupled with frequency-division, phase-division and component-amplitude-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 correction. A plurality of carrier components may be chosen which reduces the energy envelope for a period of the carrier 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 carrier components may then provide for error detection and correction.

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First Claim