Method of analyzing and processing signals
First Claim
1. A method of measuring physiological parameters, comprising:
- using a signal acquisition means to obtain a pulse oximetry signal;
performing, with signal processing means, a first wavelet transform decomposition of the pulse oximetry signal to generate a decomposed pulse oximetry signal;
identifying a primary band and a secondary band on a transform surface of a scalogram representing the decomposed pulse oximetry signal;
performing, with the signal processing means, a second wavelet transform decomposition of secondary band information derived from the secondary band to generate decomposed secondary band information; and
deriving signal features from the decomposed secondary band information that are pertinent to identifying physiological parameters causing the primary band.
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Abstract
A physiological measurement system is disclosed which can take a pulse oximetry signal such as a photoplethysmogram from a patient and then analyse the signal to measure physiological parameters including respiration, pulse, oxygen saturation and movement. The system can be used as a general monitor, or more specifically, to for infant or adult apnea, and to guard against sudden infant death syndrome. The system comprises a pulse oximeter which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to decompose that signal by wavelet transform means; feature extraction means arranged to derive physiological information from the decomposed signal; an analyser component arranged to collect information from the feature extraction means; and data output means arranged in communication with the analyser component.
191 Citations
21 Claims
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1. A method of measuring physiological parameters, comprising:
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using a signal acquisition means to obtain a pulse oximetry signal; performing, with signal processing means, a first wavelet transform decomposition of the pulse oximetry signal to generate a decomposed pulse oximetry signal; identifying a primary band and a secondary band on a transform surface of a scalogram representing the decomposed pulse oximetry signal; performing, with the signal processing means, a second wavelet transform decomposition of secondary band information derived from the secondary band to generate decomposed secondary band information; and deriving signal features from the decomposed secondary band information that are pertinent to identifying physiological parameters causing the primary band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A physiological measurement system comprising:
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a signal acquisition means which includes a light emitting device and a photodetector attachable to a subject to obtain a pulse oximetry signal; analogue to digital converter means arranged to convert said pulse oximetry signal into a digital pulse oximetry signal; signal processing means suitable to receive said digital pulse oximetry signal and arranged to perform a first wavelet transform decomposition of the digital pulse oximetry signal to generate a decomposed pulse oximetry signal; a respiration component arranged to identify a primary band and a secondary band on a transform surface of a scalogram representing the decomposed pulse oximetry signal; and to derive signal features from decomposed secondary band information that are pertinent to identifying physiological parameters causing the primary band; wherein the signal processing means is further arranged to perform a second wavelet transform decomposition of secondary band information derived from the secondary band to generate the decomposed secondary band information. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method of measuring a characteristic parameter, comprising:
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obtaining a signal which varies according to a set of parameters including the characteristic parameter; performing a first wavelet transform decomposition of the signal to generate a decomposed signal; identifying a primary band representative of the characteristic parameter, and a secondary band representative of a secondary parameter, on a transform surface of a scalogram representing the decomposed signal; performing a second wavelet transform decomposition of secondary band information derived from the secondary band to generate decomposed secondary band information; and deriving signal features from the decomposed secondary band information that are pertinent to identifying parameters causing the primary band. - View Dependent Claims (21)
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Specification