METHOD AND APPARATUS FOR SUPPRESSING POWER FREQUENCY COMMON MODE INTERFERENCE
First Claim
1. An apparatus for suppressing power frequency common mode interference in a bioelectrical signal measuring system, comprising:
- a driving circuit configured to amplify and change the phase of a common mode interference signal to produce a first driving signal, wherein the common mode interference signal is extracted from a plurality of first electrodes attached to a patient;
phase compensating and processing circuitry electrically connected to the driving circuit for receiving the first driving signal, the phase compensating and processing circuitry configured to produce a second driving signal by phase-compensating the first driving signal based on a characteristic value of power frequency interference in a bioelectrical signal acquired through the plurality of first electrodes; and
a switch to receive the first driving signal and the second driving signal, the switch configured to selectively switch between providing the first driving signal and providing the second driving signal to a second electrode attached to the patient.
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Abstract
An apparatus for suppressing power frequency common mode interference in a bioelectrical signal measuring system includes a driving circuit configured to amplify and change the phase of a common mode interference signal to produce a first driving signal, wherein the common mode interference signal is extracted from a plurality of first electrodes attached to a patient; phase compensating and processing circuitry electrically connected to the driving circuit for receiving the first driving signal, the phase compensating and processing circuitry configured to produce a second driving signal by phase-compensating the first driving signal based on a characteristic value of power frequency interference in a bioelectrical signal acquired through the plurality of first electrodes; and a switch to receive the first driving signal and the second driving signal, the switch configured to selectively switch between providing the first driving signal and providing the second driving signal to a second electrode attached to the patient.
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Citations
12 Claims
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1. An apparatus for suppressing power frequency common mode interference in a bioelectrical signal measuring system, comprising:
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a driving circuit configured to amplify and change the phase of a common mode interference signal to produce a first driving signal, wherein the common mode interference signal is extracted from a plurality of first electrodes attached to a patient; phase compensating and processing circuitry electrically connected to the driving circuit for receiving the first driving signal, the phase compensating and processing circuitry configured to produce a second driving signal by phase-compensating the first driving signal based on a characteristic value of power frequency interference in a bioelectrical signal acquired through the plurality of first electrodes; and a switch to receive the first driving signal and the second driving signal, the switch configured to selectively switch between providing the first driving signal and providing the second driving signal to a second electrode attached to the patient. - View Dependent Claims (2, 3)
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4. A method for suppressing power frequency common mode interference in a bioelectrical signal measuring system, comprising:
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receiving a common mode interference signal extracted from a plurality of first electrodes attached to a patient; amplifying and changing the phase of the common mode interference signal to produce a first driving signal; producing a second driving signal by phase-compensating the first driving signal based on a characteristic value of power frequency interference in a bioelectrical signal acquired through the plurality of first electrodes; and selectively switching between providing the first driving signal and providing the second driving signal to a second electrode attached to the patient. - View Dependent Claims (5, 6, 7, 8, 9)
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10. An apparatus for suppressing power frequency common mode interference in a bioelectrical signal measuring system, comprising:
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driving means for amplifying and changing the phase of a common mode interference signal to produce a first driving signal, wherein the common mode interference signal is extracted from a plurality of first electrodes attached to a patient; phase compensating and processing means electrically connected to the driving means for receiving the first driving signal, the phase compensating and processing means for producing a second driving signal by phase-compensating the first driving signal based on a characteristic value of power frequency interference in a bioelectrical signal acquired through the plurality of first electrodes; and switching means for receiving the first driving signal and the second driving signal, the switch means for selectively switching between providing the first driving signal and providing the second driving signal to a second electrode attached to the patient. - View Dependent Claims (11, 12)
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Specification