Signal component processor
First Claim
1. A signal processor comprising:
- a physiological signal;
a basis function index determined from said signal;
a basis function waveform generated according to said index;
a component derived from said sensor signal and said waveform; and
a physiological measurement responsive to said component.
3 Assignments
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Accused Products
Abstract
A signal processor generates basis functions and identifies at least one basis function component of a sensor signal in order to calculate a physiological measurement. The signal processor is advantageously applied to pulse oximetry so as to directly calculate oxygen saturation and so as to calculate a robust oxygen saturation measurement. In particular, a signal component transform may be calculated within a window around a derived pulse rate estimate. A signal component transform may also utilize sinusoidal basis functions, and an optimization of a signal component transform may occur at a particular frequency or a set of frequencies. A sinusoidal waveform or waveforms at that frequency or set of frequencies is generated to select associated red and infrared components of the sensor signal, and an oxygen saturation is calculated from a magnitude ratio of these components.
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Citations
12 Claims
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1. A signal processor comprising:
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a physiological signal;
a basis function index determined from said signal;
a basis function waveform generated according to said index;
a component derived from said sensor signal and said waveform; and
a physiological measurement responsive to said component.
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2. A signal processor comprising:
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a signal input;
a basis function indicator derived from said signal input;
a plurality of basis functions generated according to said indicator;
a plurality of characteristics of said signal input corresponding to said basis functions; and
an optimization of said characteristics so as to identify at least one of said basis functions. - View Dependent Claims (3, 4, 5)
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6. A signal processing method comprising the steps of:
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receiving a sensor signal;
calculating an estimated pulse rate;
determining an optimization of said sensor signal proximate said estimated pulse rate;
defining a frequency corresponding to said optimization; and
outputting a physiological measurement responsive to a component of said sensor signal at said frequency. - View Dependent Claims (7, 8, 9, 10)
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11. A signal processor comprising:
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a first calculator means for deriving an optimization frequency from a pulse rate estimate and a sensor signal; and
a second calculator means for deriving a physiological measurement responsive to a sensor signal component at said frequency. - View Dependent Claims (12)
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Specification