Variable indication estimator
First Claim
1. A signal processor which determines an output oxygen saturation (SpO2) value for a set of input SpO2 values, the signal processor comprising:
- a buffer which stores a window of input SpO2 values determined using a signal representative of one or more signals attenuated after emission into tissue at a measurement site;
a signal confidence indicator;
anda processor which receives the signal confidence indicator and which accesses the buffer to receive the input SpO2 values, wherein the processor is configured to determine output SpO2 values for the window of input SpO2 values by adjusting the output SpO2 values between smoothing characteristics and tracking characteristics, the tracking characteristics indicating a trend of the input SpO2 values, wherein the adjustment is based on the signal confidence indicator.
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Reexamination
Accused Products
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
19 Claims
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1. A signal processor which determines an output oxygen saturation (SpO2) value for a set of input SpO2 values, the signal processor comprising:
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a buffer which stores a window of input SpO2 values determined using a signal representative of one or more signals attenuated after emission into tissue at a measurement site; a signal confidence indicator; and a processor which receives the signal confidence indicator and which accesses the buffer to receive the input SpO2 values, wherein the processor is configured to determine output SpO2 values for the window of input SpO2 values by adjusting the output SpO2 values between smoothing characteristics and tracking characteristics, the tracking characteristics indicating a trend of the input SpO2 values, wherein the adjustment is based on the signal confidence indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of generating an output oxygen saturation (SpO2) value representative of a desired signal from a set of input (SpO2) values, the method comprising:
- accessing a set of input (SpO2) values of a signal, wherein the signal includes a desired signal indicative of an accurate SpO2 and may include other signal artifacts;
accessing a measure of signal confidence; and determining an output (SpO2) values adjusting the output SpO2 values between smoothing characteristics and tracking characteristics, the tracking characteristics indicating atrend of the input SpO2 values, wherein adjusting is based on the measure of signal confidence. - View Dependent Claims (15, 16, 17, 18, 19)
- accessing a set of input (SpO2) values of a signal, wherein the signal includes a desired signal indicative of an accurate SpO2 and may include other signal artifacts;
Specification