SIGNAL PROCESSING APPARATUS AND METHOD
First Claim
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1. A noninvasive physiological monitor comprising:
- a first input for receiving an output waveform from a detector responsive light attenuated by body tissue, the output waveform including at least a first waveform corresponding to a first wavelength of light attenuated by body tissue and a second waveform corresponding to a second wavelength of light attenuated by body tissue;
a signal processor configured to transform said first and second waveforms into spectral domain waveforms, the processor further configured to select spectral data based on predetermined criteria, the signal processor further configured to determine a physiological indication of the patient based on the selected spectral data.
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Abstract
A method and an apparatus to analyze two measured signals that are modeled as containing desired and undesired portions such as noise, FM and AM modulation. Coefficients relate the two signals according to a model defined. The method and apparatus are particularly advantageous to blood oximetry and pulserate measurements.
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Citations
10 Claims
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1. A noninvasive physiological monitor comprising:
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a first input for receiving an output waveform from a detector responsive light attenuated by body tissue, the output waveform including at least a first waveform corresponding to a first wavelength of light attenuated by body tissue and a second waveform corresponding to a second wavelength of light attenuated by body tissue; a signal processor configured to transform said first and second waveforms into spectral domain waveforms, the processor further configured to select spectral data based on predetermined criteria, the signal processor further configured to determine a physiological indication of the patient based on the selected spectral data. - View Dependent Claims (2, 3, 4, 5)
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6. A method of determining physiological information noninvasively based on optical measurements, the method comprising:
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receiving, from a detector, a waveform indicative of tissue attenuated light detected by the detector, the waveform including at least a first waveform corresponding to a first a wavelength of light attenuated by body tissue and a second waveform correspond to a second wavelength of light attenuated by body tissue; transforming said first and second waveforms into spectral domain waveforms, the processor further configured to select spectral data based on predetermined criteria; determining, using one or more processors, a physiological indication of the patient based on the selected spectral data. - View Dependent Claims (7, 8, 9, 10)
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Specification