Photoplethysmographics using component-amplitude-division multiplexing
First Claim
1. A device for collecting photoplethysmographic data, comprisingmeans for multiplying a mixing matrix and a vector of component signals;
- means for applying a plurality of modulating effects to a resultant of said means for multiplying; and
means for multiplying an inverse of said mixing matrix and a resultant of said means for applying.
4 Assignments
0 Petitions
Accused Products
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.
142 Citations
44 Claims
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1. A device for collecting photoplethysmographic data, comprising
means for multiplying a mixing matrix and a vector of component signals; -
means for applying a plurality of modulating effects to a resultant of said means for multiplying; and means for multiplying an inverse of said mixing matrix and a resultant of said means for applying. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A device for collecting photoplethysmographic data, comprising
means for component-amplitude-division multiplexing a plurality of modulating signals; -
means for applying a modulation effect to a resultant of said means for component-amplitude-division multiplexing; and means for component-amplitude-division demultiplexing said plurality of signals; wherein said means for component-amplitude-division multiplexing and said means for component-amplitude-division demultiplexing collectively comprise means for multiplying a mixing matrix and means for multiplying an inverse of said mixing matrix.
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22. A device for collecting photoplethysmographic data, comprising
means for component-amplitude-division multiplexing a plurality of modulating signals; -
means for applying a modulation effect to a resultant of said means for component-amplitude-division multiplexing; and means for component-amplitude-division demultiplexing said plurality of signals; and means for error detection in response to a resultant of said means for component-amplitude-division demultiplexing. - View Dependent Claims (23, 24)
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25. A device for collecting photoplethysmographic data, comprising
means for component-amplitude-division multiplexing a plurality of modulating signals; -
means for applying a modulation effect to a resultant of said means for component-amplitude-division multiplexing; and means for component-amplitude-division demultiplexing said plurality of signals; and means for error correction in response to a resultant of said means for component-amplitude-division demultiplexing. - View Dependent Claims (26)
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27. A method of collecting photoplethysmographic data, comprising the steps of
multiplying a mixing matrix and a vector of component signals; -
applying a plurality of modulating effects to a resultant of said step of multiplying; and multiplying an inverse of said mixing matrix and a resultant of said step of applying. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method of collecting photoplethysmographic data, comprising the steps of
component-amplitude-division multiplexing a plurality of modulating signals; -
applying a modulation effect to a resultant of said means for component-amplitude-division multiplexing; and component-amplitude-division demultiplexing said plurality of signals; and performing of error detection in response to a resultant of said step of component-amplitude-division demultiplexing.
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43. A method of collecting photoplethysmographic data, comprising the steps of
component-amplitude-division multiplexing a plurality of modulating signals; -
applying a modulation effect to a resultant of said means for component-amplitude-division multiplexing; and component-amplitude-division demultiplexing said plurality of signals; and performing error correction in response to a resultant of said step of component-amplitude-division demultiplexing. - View Dependent Claims (44)
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Specification