Detecting a signal quality decrease in a measurement system
First Claim
1. A method of determining signal quality information of a physiological signal, comprising:
- obtaining the physiological signal;
generating a scalogram based at least in part on a wavelet transform of the physiological signal;
determining one or more first characteristics of a pulse band of the scalogram;
determining one or more second characteristics of a mains hum band or a noise band of the scalogram; and
determining signal quality information of the physiological signal based at least in part on the one or more first characteristics and the one or more second characteristics.
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Abstract
Techniques for detecting a signal quality decrease are disclosed. A sensor or probe may be used to obtain a plethysmograph or photoplethysmograph (PPG) signal from a subject. A wavelet transform of the signal may be performed and a scalogram may be generated based at least in part on the wavelet transform. One or more characteristics of the scalogram may be determined. The determined characteristics may include, for example, energy values and energy structural characteristics in a pulse band, a mains hum band, and/or a noise band. Such characteristics may be analyzed to produce signal quality values and associated signal quality trends. One or more signal quality values and signal quality trends may be used to determine if a signal quality decrease has occurred or is likely to occur.
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Citations
20 Claims
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1. A method of determining signal quality information of a physiological signal, comprising:
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obtaining the physiological signal; generating a scalogram based at least in part on a wavelet transform of the physiological signal; determining one or more first characteristics of a pulse band of the scalogram; determining one or more second characteristics of a mains hum band or a noise band of the scalogram; and determining signal quality information of the physiological signal based at least in part on the one or more first characteristics and the one or more second characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for determining signal quality information of a physiological signal, comprising:
a processor configured to; obtain the physiological signal; generate a scalogram based at least in part on a wavelet transform of the physiological signal; determine one or more first characteristics of a pulse band of the scalogram; determine one or more second characteristics of a mains hum band or a noise band of the scalogram; and determine signal quality information of the physiological signal based at least in part on the one or more first characteristics and the one or more second characteristics. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification