Circuit and method for compensating for an electrode motion artifact
First Claim
1. A method of compensating for an electrode motion artifact, the method comprising:
- measuring an electrocardiogram signal including an electrode motion artifact signal;
forming a first impedance between a subject and a first electrode attached to the subject and forming a second impedance between the subject and a second electrode attached to the subject;
measuring a difference between the first impedance and the second impedance using a carrier signal; and
adjusting the electrocardiogram signal using a signal of the measured difference between the first impedance and the second impedance.
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Abstract
A circuit and method for compensating for an electrode motion artifact in which the electrode motion artifact is generated because impedance between a subject and a measuring electrode changes during measurement of the subject'"'"'s biosignal, and the electrode motion artifact can be differentially measured and an electrocardiogram signal can be compensated by introducing a predetermined voltage or an electric current to the subject. A circuit and method for compensating electrode motion artifact, which can differentially measure the difference information between impedance components by introducing a predetermined voltage or electric current to a subject, in association with the electrode motion artifact. In this instance, the impedance component is a component of electrode motion artifact and the electrode motion artifact is generated when measuring a biosignal.
28 Citations
10 Claims
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1. A method of compensating for an electrode motion artifact, the method comprising:
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measuring an electrocardiogram signal including an electrode motion artifact signal;
forming a first impedance between a subject and a first electrode attached to the subject and forming a second impedance between the subject and a second electrode attached to the subject;
measuring a difference between the first impedance and the second impedance using a carrier signal; and
adjusting the electrocardiogram signal using a signal of the measured difference between the first impedance and the second impedance. - View Dependent Claims (2, 3, 4)
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5. A circuit for compensating for an electrode motion artifact, comprising:
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a carrier signal source oscillating a carrier signal;
a first electrode and a second electrode measuring a voltage or an electric current of the subject to which the carrier signal is introduced;
a third electrode introducing the oscillated carrier signal into a subject;
a differential amplifier differentially detecting or amplifying signals from the first electrode and the second electrode and outputting an output signal, the output signal including an electrocardiogram signal and an electrode motion artifact measured from the subject; and
an electrocardiogram extraction unit removing the electrode motion artifact signal from the output signal and selectively extracting only the electrocardiogram signal. - View Dependent Claims (6, 7)
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8. A circuit for compensating electrode motion artifact, comprising:
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a carrier signal source oscillating a carrier signal;
a first electrode and a second electrode measuring a voltage or an electric current of a subject to which the carrier signal is introduced;
a third electrode introducing the oscillated carrier signal to the subject;
a differential amplifier differentially detecting or amplifying signals from the first electrode and the second electrode and outputting an output signal, the output signal including an electrocardiogram signal and an electrode motion artifact measured from the subject;
a filter passing the output signal and selectively detecting the electrocardiogram signal belonging to a particular frequency band; and
a feedback controller returning an output signal excluding the detected electrocardiogram signal to the differential amplifier.
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9. A circuit for compensating electrode motion artifact, comprising:
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a first electrode and a second electrode measuring a voltage or an electric current of a subject;
a third electrode grounding the subject;
a differential amplifier differentially detecting or amplifying signals from the first electrode and the second electrode and outputting an output signal, the output signal including an electrocardiogram signal and an electrode motion artifact measured from the subject; and
an electrocardiogram extraction unit removing the electrode motion artifact signal from the output signal and selectively extracting only the electrocardiogram signal, the electrocardiogram extraction unit comprising;
a demodulator demodulating the modulated electrode motion artifact by the carrier signal; and
a filter filtering a particular frequency band of the output signal to detect the demodulated electrode motion artifact and electrocardiogram signal,wherein a carrier signal oscillated from a predetermined carrier signal source is introduced to the differential amplifier.
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10. A computer-readable recording medium encoded with processing instructions for causing a processor to execute a method of compensating for an electrode motion artifact, the method comprising:
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measuring an electrocardiogram signal including an electrode motion artifact signal;
forming a first impedance between a subject and a first electrode attached to the subject and forming a second impedance between the subject and a second electrode attached to the subject;
measuring a difference between the first impedance and the second impedance using a carrier signal; and
adjusting the electrocardiogram signal using a signal of the measured difference between the first impedance and the second impedance.
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Specification