Selection of preset filter parameters based on signal quality
First Claim
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1. In a system for measuring a physiological parameter, a method of reducing noise effects, comprising:
- receiving input signals of more than one wavelength;
obtaining an assessment of the signal quality of the input signals by obtaining a measure of the correlation between the signals of different wavelengths;
selecting coefficients for a digital filter using the assessment of signal quality; and
filtering the input signals using the digital filter, without comparing the filter'"'"'s output signal with the input signals.
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Abstract
Methods and devices for reducing noise effects in a system for measuring a physiological parameter, including receiving an input signal; obtaining an assessment of the signal quality of the input signal; selecting coefficients for a digital filter using the assessment of signal quality; and filtering the input signal using the digital filter, without comparing the filter'"'"'s output signal with the input signal.
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Citations
20 Claims
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1. In a system for measuring a physiological parameter, a method of reducing noise effects, comprising:
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receiving input signals of more than one wavelength; obtaining an assessment of the signal quality of the input signals by obtaining a measure of the correlation between the signals of different wavelengths; selecting coefficients for a digital filter using the assessment of signal quality; and filtering the input signals using the digital filter, without comparing the filter'"'"'s output signal with the input signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a system for a measuring a physiological parameter, an apparatus for reducing noise effects, comprising:
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means for receiving input signals of more than one wavelength; means for obtaining an assessment of the signal quality of the input signals by obtaining a measure of the correlation between the signals of different wavelengths; means for selecting coefficients for a digital filter using the assessment of signal quality; and means for filtering the input signals using the digital filter, without comparing the filter'"'"'s output signal with said input signals. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification