METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION USING AUTOCORRELATION AND AN ENVELOPE TECHNIQUE
First Claim
1. A subject monitoring system for determining physiological information of a subject, comprising:
- a sensor configured to generate an intensity signal, wherein the sensor detects light attenuated by the subject; and
processing equipment coupled to the sensor, wherein the processing equipment is configured to;
generate an envelope based on a segment of an optical intensity signal derived from the intensity signal;
modify the optical intensity signal based on the envelope;
calculate an autocorrelation sequence based on the modified optical intensity signal; and
determine a value indicative of a physiological rate of the subject based on the autocorrelation sequence.
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Accused Products
Abstract
A physiological monitoring system may process a physiological signal such a photoplethysmograph signal from a subject. The system may determine physiological information, such as a physiological rate, from the physiological signal. The system may use search techniques and qualification techniques to determine one or more initialization parameters. The initialization parameters may be used to calculate and qualify a physiological rate. The system may use signal conditioning to reduce noise in the physiological signal and to improve the determination of physiological information. The system may use qualification techniques to confirm determined physiological parameters. The system may also use autocorrelation techniques, cross-correlation techniques, fast start techniques, and/or reference waveforms when processing the physiological signal.
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Citations
32 Claims
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1. A subject monitoring system for determining physiological information of a subject, comprising:
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a sensor configured to generate an intensity signal, wherein the sensor detects light attenuated by the subject; and processing equipment coupled to the sensor, wherein the processing equipment is configured to; generate an envelope based on a segment of an optical intensity signal derived from the intensity signal; modify the optical intensity signal based on the envelope; calculate an autocorrelation sequence based on the modified optical intensity signal; and determine a value indicative of a physiological rate of the subject based on the autocorrelation sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A processing module for determining physiological information of a subject, wherein the processing module is configured to:
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receive an optical intensity signal derived from a detector output, wherein the detector detects light attenuated by the subject; generate an envelope based on a segment of the optical intensity signal; modify the optical intensity signal based on the envelope; calculate an autocorrelation sequence based on the modified optical intensity signal; and determine a value indicative of a physiological rate of the subject based on the autocorrelation sequence. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for determining physiological information of a subject, comprising:
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receiving an intensity signal derived from a detector output, wherein the detector detects light attenuated by the subject; generating an envelope based on a segment of the intensity signal; modifying the intensity signal based on the envelope; calculating an autocorrelation sequence based on the modified intensity signal; and determining, using processing equipment, a value indicative of a physiological rate of the subject based on the autocorrelation sequence. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A computer-readable medium for use in determining physiological information of a subject, the computer-readable medium having computer program instructions recorded thereon for:
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receiving an intensity signal derived from a detector output, wherein the detector detects light attenuated by the subject; generating an envelope based on a segment of the intensity signal; modifying the intensity signal based on the envelope; calculating an autocorrelation sequence based on the modified intensity signal; and determining a value indicative of a physiological rate of the subject based on the autocorrelation sequence. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification