METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION BASED ON THE SHAPE OF AUTOCORRELATION PEAKS
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;
calculate an autocorrelation sequence of an optical intensity signal derived from the intensity signal;
identify one or more peaks of the autocorrelation sequence; and
determine a value indicative of a physiological rate of the subject based on an analysis of the shape of the one or more peaks.
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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; calculate an autocorrelation sequence of an optical intensity signal derived from the intensity signal; identify one or more peaks of the autocorrelation sequence; and determine a value indicative of a physiological rate of the subject based on an analysis of the shape of the one or more peaks. - 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; calculate an autocorrelation sequence of the optical intensity signal; identify one or more peaks of the autocorrelation sequence; and determine a value indicative of a physiological rate of the subject based on an analysis of the shape of the one or more peaks. - 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 optical intensity signal derived from a detector output, wherein the detector detects light attenuated by the subject; calculating an autocorrelation sequence of the optical intensity signal; identifying one or more peaks of the autocorrelation sequence; and determining, using processing equipment, a value indicative of a physiological rate of the subject based on an analysis of the shape of the one or more peaks. - 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 optical intensity signal derived from a detector output, wherein the detector detects light attenuated by the subject; calculating an autocorrelation sequence of the optical intensity signal; identifying one or more peaks of the autocorrelation sequence; and determining a value indicative of a physiological rate of the subject based on an analysis of the shape of the one or more peaks. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification