Signal Demodulation
AssigneeNellcor Puritan Bennett LLC
InventorEthan Petersen
Life of this patent
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Abstract
A method for processing an analog composite signal in a system has the steps of receiving a composite signal with at least one first signal component and at least one interfering signal component; filtering the composite signal with a filter having a transfer function H(s); sampling the filtered composite signal in periodic intervals wherein each periodic interval has n samples; forming a matrix equation representing the composite signal wherein the matrix equation has a signal vector with the at least first one signal component and the at least one interfering signal component and a matrix comprising weighted coefficients; solving the matrix equation to determine the at least one signal component; outputting the at least one signal component.
Claims25
A method for processing an analog composite signal in a system, the method comprising the steps of:
- receiving a composite signal comprising at least one first signal component and at least one interfering signal component;
- filtering the composite signal with a filter having a transfer function H(s);
- sampling the filtered composite signal in periodic intervals wherein each periodic interval comprises n samples;
- forming a matrix equation representing the composite signal wherein the matrix equation comprises a signal vector comprising the at least first one signal component and the at least one interfering signal component and a matrix comprising weighted coefficients;
- solving the matrix equation to determine the at least one signal component;
- outputting the at least one signal component.
A system for processing an analog composite signal comprising at least one first signal component and at least one interfering signal component, the system comprising:
- a filter having a transfer function H(s) receiving the composite signal and outputting a filtered composite signal;
- an analog-to-digital converter receiving the filtered composite signal and sampling the filtered composite signal in periodic intervals wherein each periodic interval comprises n samples;
- a signal processor receiving the sampled filtered composite signal, wherein the signal processor forms a matrix equation representing the composite signal wherein the matrix equation comprises a signal vector comprising the at least first one signal component and the at least one interfering signal component and a matrix comprising weighted coefficients, wherein the signal processor is furthermore operable to solve the matrix equation to calculate the at least one signal component and to output the at least one signal component.
An oximeter system comprising:
- an oximeter sensor generating an output signal with a Red signal component and an Infrared (IR) signal component which are timely separated within a periodic interval wherein the Red signal component and the IR signal component each comprise a predetermined signal length having an on and off transient,
- a filter having a transfer function H(s) receiving a composite signal consisting of the oximeter sensor output signal and at least one interfering signal component, wherein the filter outputs a filtered composite signal;
- an analog-to-digital converter receiving the filtered composite signal and sampling the filtered composite signal in periodic intervals wherein each periodic interval comprises n samples;
- a signal processor receiving the sampled filtered composite signal, wherein the signal processor forms a matrix equation representing the composite signal wherein the matrix equation comprises a signal vector comprising the Red and IR signal components and the at least one interfering signal component and a matrix comprising weighted coefficients, wherein the signal processor is furthermore operable to solve the matrix equation to calculate the Red and IR signal components and to output the Red and IR signal components.
A method for processing an analog composite signal in an oximeter system, the method comprising the steps of:
- receiving a composite signal comprising at Red signal component and an infrared (IR) signal component from an oximeter sensor and at least one interfering signal component;
- filtering the composite signal with a filter having a transfer function H(s);
- sampling the filtered composite signal in periodic intervals wherein each periodic interval comprises n samples;
- forming a matrix equation representing the system wherein the matrix equation comprises a signal vector comprising the Red and IR signal component and the at least one interfering signal component and a matrix comprising weighted coefficients;
- solving the matrix equation to calculate the Red and IR signal components;
- outputting the Red and IR signal components.
Dependencies are inferred from the claim text.