Reducing data acquisition, power and processing for photoplethysmography and other applications
First Claim
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1. A method for reducing the amount of data required to analyze a hemodynamic signal, comprising:
- (a) for a window of time that spans at least two respiratory cycles, producing only one sample of the hemodynamic signal per respiratory cycle, at a substantially same instant in each respiratory cycle, to thereby produce a plurality of samples for the window; and
(b) analyzing the hemodynamic signal based on the plurality of samples,wherein each said sample is indicative of an amplitude of the hemodynamic signal at a single moment in one of the respiratory cycles.
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Abstract
Hemodynamic signals, such as photoplethysmography (PPG) signals, pressure signals, and impedance signals, are sampled once per cyclical body cycle to reduce the amount of data, processing and/or power required to analyze the hemodynamic signals.
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Citations
18 Claims
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1. A method for reducing the amount of data required to analyze a hemodynamic signal, comprising:
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(a) for a window of time that spans at least two respiratory cycles, producing only one sample of the hemodynamic signal per respiratory cycle, at a substantially same instant in each respiratory cycle, to thereby produce a plurality of samples for the window; and (b) analyzing the hemodynamic signal based on the plurality of samples, wherein each said sample is indicative of an amplitude of the hemodynamic signal at a single moment in one of the respiratory cycles. - View Dependent Claims (2, 3, 4, 5)
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6. A method for reducing the amount of data required to analyze a hemodynamic signal, comprising:
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(a) for each of a plurality of windows of time, producing only one sample of the hemodynamic signal per respiratory cycle, at a substantially same instant in each respiratory cycle, to thereby produce a plurality of samples for each window, wherein each window spans at least two respiratory cycles; (b) for each of the plurality of windows, averaging the plurality of samples, to thereby produce an average value for each window; and (c) analyzing the hemodynamic signal based on the average values, wherein each said sample is indicative of an amplitude of the hemodynamic signal at a single moment in one of the respiratory cycles. - View Dependent Claims (7, 8, 9, 10)
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11. A method for reducing the amount of data required to analyze a photoplethysmography (PPG) hemodynamic signal, comprising:
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(a) for each of a plurality of windows of time, producing only one sample of the PPG signal per respiratory cycle, at a substantially same instant in each respiratory cycle, to thereby produce a plurality of samples for each window, wherein each window spans at least two respiratory cycles, and wherein each said sample is indicative of an amplitude of the PPG signal at a single moment in one of the respiratory cycles; (b) for each of the plurality of windows, averaging the plurality of samples, to thereby produce an average value for each window; and (c) analyzing the PPG signal based on the average values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification