Selection of ensemble averaging weights for a pulse oximeter based on signal quality metrics
First Claim
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1. A method of ensemble averaging signals in a pulse oximeter, comprising:
- receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light;
obtaining an assessment of the signal quality of said electromagnetic signals;
calculating weights for an ensemble averager from a continuous weighting function using said assessment of signal quality; and
ensemble averaging said electromagnetic signals using said ensemble averager.
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Abstract
A method and a system for ensemble averaging signals in a pulse oximeter, including receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light, obtaining an assessment of the signal quality of the electromagnetic signals, selecting weights for an ensemble averager using the assessment of signal quality, and ensemble averaging the electromagnetic signals using the ensemble averager.
211 Citations
27 Claims
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1. A method of ensemble averaging signals in a pulse oximeter, comprising:
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receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light; obtaining an assessment of the signal quality of said electromagnetic signals; calculating weights for an ensemble averager from a continuous weighting function using said assessment of signal quality; and ensemble averaging said electromagnetic signals using said ensemble averager. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for ensemble averaging signals in a pulse oximeter, comprising:
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means for receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light; means for obtaining an assessment of the signal quality of said electromagnetic signals; means for calculating weights for an ensemble averager from a continuous weighting function using said assessment of signal quality; and an ensemble averager for ensemble averaging said electromagnetic signals using said weights. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A pulse oximetry system comprising:
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a sensor configured to receive first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to two different wavelengths of light; and a pulse oximeter configured to; obtain an assessment of the signal quality of the electromagnetic signals; calculate at least one weight for an ensemble average using a continuously variable weighting function using the assessment of signal quality; and ensemble average the electromagnetic signals using the calculated weight. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A tangible machine readable medium comprising:
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code adapted to calculate a signal quality metric based on a correlation between a first received light signal and a second received light signal, wherein the first signal and the second signal are received at substantially the same time; code adapted to determine ensemble averaging weights based on a continuously variable weighting function; and code adapted to ensemble average the electromagnetic signals using the determined ensemble averaging weights. - View Dependent Claims (27)
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Specification