Biopotential Signal Source Separation Using Source Impedances
First Claim
1. A method of signal separation, comprising:
- receiving, at a first input impedance, a first composite signal from an electrode arrangement suitable for coupling to a heart;
receiving, at a second input impedance, a second composite signal from the electrode arrangement;
selecting a target source impedance; and
separating a cardiac source signal from another physiological source signal using the first and second composite signals and the selected target source impedance, the cardiac source signal having a first source impedance associated therewith and the another physiological source signal having a second source impedance associated therewith different from the first source impedance;
wherein the first input impedance is smaller than the first and second source impedances and the second input impedance is smaller than the first and second source impedances.
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Abstract
Cardiac methods and devices that separate signals using at least two composite signals acquired at least at two input impedances. A target source impedance may be selected, and a cardiac signal may be separated from composite signals using the selected target source impedance. Medical systems include a cardiac device having a housing that provides amplification circuitry configured to have a first amplifier input impedance and a second amplifier input impedance, such as using two separate circuits or switching between two input impedances. One or more electrode assemblies are coupled to the amplification circuitry. A signal processor is provided in the housing configured to separate a source signal using a first composite signal detected at the first input impedance and a second composite signal detected at the second input impedance. The phase response of the first input amplifier circuit is about equal to that of the second input amplifier circuit.
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Citations
20 Claims
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1. A method of signal separation, comprising:
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receiving, at a first input impedance, a first composite signal from an electrode arrangement suitable for coupling to a heart; receiving, at a second input impedance, a second composite signal from the electrode arrangement; selecting a target source impedance; and separating a cardiac source signal from another physiological source signal using the first and second composite signals and the selected target source impedance, the cardiac source signal having a first source impedance associated therewith and the another physiological source signal having a second source impedance associated therewith different from the first source impedance; wherein the first input impedance is smaller than the first and second source impedances and the second input impedance is smaller than the first and second source impedances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of signal separation, comprising:
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receiving, at a first input impedance, a first composite signal from an electrode arrangement suitable for coupling to a heart; receiving, at a second input impedance, a second composite signal from the electrode arrangement; selecting a target source impedance; and separating a cardiac source signal from another physiological source signal using the first and second composite signals and the selected target source impedance and using an attenuation factor, the cardiac source signal having a first source impedance associated therewith and the another physiological source signal having a second source impedance associated therewith different from the first source impedance; wherein the first input impedance is smaller than the first and second source impedances and the second input impedance is smaller than the first and second source impedances. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification