METHODS AND SYSTEMS FOR DETERMINING PHYSIOLOGICAL INFORMATION USING MODULATED SIGNALS
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;
perform a first modulation based on the intensity signal using a first modulation signal to generate a first modulated intensity signal;
perform a second modulation based on the intensity signal using a second modulation signal to generate a second modulated intensity signal;
generate a phase signal based on the first modulated intensity signal and the second modulated intensity signal; and
determine a value indicative of a physiological rate of the subject based on the phase signal.
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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.
16 Citations
28 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; perform a first modulation based on the intensity signal using a first modulation signal to generate a first modulated intensity signal; perform a second modulation based on the intensity signal using a second modulation signal to generate a second modulated intensity signal; generate a phase signal based on the first modulated intensity signal and the second modulated intensity signal; and determine a value indicative of a physiological rate of the subject based on the phase signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A processing module for determining physiological information of a subject, wherein the processing module is configured to:
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receive an intensity signal from a detector, wherein the detector detects light attenuated by the subject; perform a first modulation based on the intensity signal using a first modulation signal to generate a first modulated intensity signal; perform a second modulation based on the intensity signal using a second modulation signal to generate a second modulated intensity signal; generate a phase signal based on the first modulated intensity signal and the second modulated intensity signal; and determine a value indicative of a physiological rate of the subject based on the phase signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for determining physiological information of a subject, comprising:
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receiving an intensity signal from a detector, which detects light attenuated by the subject; performing a first modulation based on the intensity signal using a first modulation signal to generate a first modulated intensity signal; performing a second modulation based on the intensity signal using a second modulation signal to generate a second modulated intensity signal; generating a phase signal based on the first modulated intensity signal and the second modulated intensity signal; and determining, using processing equipment, a value indicative of a physiological rate of the subject based on the phase signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. 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 from a detector, which detects light attenuated by the subject; performing a first modulation based on the intensity signal using a first modulation signal to generate a first modulated intensity signal; performing a second modulation based on the intensity signal using a second modulation signal to generate a second modulated intensity signal; generating a phase signal based on the first modulated intensity signal and the second modulated intensity signal; and determining a value indicative of a physiological rate of the subject based on the phase signal. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification