Variable indication estimator
First Claim
1. A signal processor which determines an output value for a set of input values, the signal processor comprising:
- a buffer which stores a window of input values from a signal representative of one or more signals attenuated after emission into tissue at a measurement site;
a signal confidence indicator;
a memory storing an estimator; and
a processor which receives the signal confidence indicator and which accesses the buffer to receive the input values, wherein the processor is configured to execute the estimator using the input values to reduce the input values to a plurality of estimates, and is configured to determine an output value for the window of input values from the plurality of estimates based on a selected time associated with the signal confidence indicator.
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Abstract
A variable indication estimator which determines an output value representative of a set of input data. For example, the estimator can reduce input data to estimates of a desired signal, select a time, and determine an output value from the estimates and the time. In one embodiment, the time is selected using one or more adjustable signal confidence parameters determine where along the estimates the output value will be computed. By varying the parameters, the characteristics of the output value are variable. For example, when input signal confidence is low, the parameters are adjusted so that the output value is a smoothed representation of the input signal. When input signal confidence is high, the parameters are adjusted so that the output value has a faster and more accurate response to the input signal.
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Citations
25 Claims
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1. A signal processor which determines an output value for a set of input values, the signal processor comprising:
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a buffer which stores a window of input values from a signal representative of one or more signals attenuated after emission into tissue at a measurement site;
a signal confidence indicator;
a memory storing an estimator; and
a processor which receives the signal confidence indicator and which accesses the buffer to receive the input values, wherein the processor is configured to execute the estimator using the input values to reduce the input values to a plurality of estimates, and is configured to determine an output value for the window of input values from the plurality of estimates based on a selected time associated with the signal confidence indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of generating an output value representative of a desired signal from a set of input values, the method comprising:
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accessing a set of input values of a signal, wherein the signal includes a desired signal representing a physiological parameter and may include other signal artifacts;
accessing a measure of signal confidence;
estimating values of the desired signal from the input values; and
determining an output value based on the estimated values and on a time associated with the measure of signal confidence. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method of generating an alarm corresponding to a physiological condition of a patient dropping below a threshold level, the method comprising:
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determining a curve fit for a set of data points, wherein the data points correspond to a signal representative of a physiological condition of a patient;
selecting a point on the curve fit based on a confidence value; and
generating an alarm condition when a value corresponding to the selected point is outside a range of acceptable values.
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24. A method of determining an output value for a set of input data, the method comprising:
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reducing input data to estimates of a desired signal;
selecting a time using a characteristic of the input data; and
determining an output value based on the time and the estimates. - View Dependent Claims (25)
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Specification