Method and apparatus for suppressing power frequency common mode interference
First Claim
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1. An apparatus for suppressing power frequency common mode interference and used in a bioelectrical signal measuring system, comprising:
- a common mode interference signal extracting circuit;
a driving circuit connected to the extracting circuit, the driving circuit configured to generate a first driving signal; and
a delayer connected to the driving circuit, the delayer configured to perform a corresponding adjustable time delay on the first driving signal outputted by the driving circuit,wherein the driving circuit is further configured to change a phase of a common mode interference signal and amplify the common mode interference signal to generate, the first driving signal, wherein either the first driving signal or a second driving signal comprising a modified version of the first driving signal is selectively outputted to a living body on examination,wherein the apparatus further includes phase compensating and processing circuitry configured to;
receive both a bioelectrical signal from the living body on examination and the first driving signal outputted from the driving circuit,determine a phase compensation amount of the first driving signal outputted from the driving circuit according to a characteristic value of a power frequency interference in the bioelectrical signal so as to phase-compensate the first driving signal outputted from the driving circuit to generate the second driving signal, andselectively output, based on a user selection, either the first driving signal or the second driving signal to the living body on examination.
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Abstract
A method for suppressing power frequency common mode interference comprises the following steps of: receiving a bioelectrical signal from a living body on examination by phase compensating and processing circuitry; analyzing the characteristics of the bioelectrical signal and determining a phase compensation amount by the phase compensating and processing circuitry; performing a corresponding time delay processing on an amplified signal outputted by the driving circuit; and providing the delay signal to the living body on examination.
10 Citations
10 Claims
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1. An apparatus for suppressing power frequency common mode interference and used in a bioelectrical signal measuring system, comprising:
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a common mode interference signal extracting circuit; a driving circuit connected to the extracting circuit, the driving circuit configured to generate a first driving signal; and a delayer connected to the driving circuit, the delayer configured to perform a corresponding adjustable time delay on the first driving signal outputted by the driving circuit, wherein the driving circuit is further configured to change a phase of a common mode interference signal and amplify the common mode interference signal to generate, the first driving signal, wherein either the first driving signal or a second driving signal comprising a modified version of the first driving signal is selectively outputted to a living body on examination, wherein the apparatus further includes phase compensating and processing circuitry configured to; receive both a bioelectrical signal from the living body on examination and the first driving signal outputted from the driving circuit, determine a phase compensation amount of the first driving signal outputted from the driving circuit according to a characteristic value of a power frequency interference in the bioelectrical signal so as to phase-compensate the first driving signal outputted from the driving circuit to generate the second driving signal, and selectively output, based on a user selection, either the first driving signal or the second driving signal to the living body on examination. - View Dependent Claims (2, 3, 4, 5)
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6. A method for suppressing power frequency common mode interference, which is used for suppressing interference of power frequency common mode signal as a bioelectrical signal measuring system detects bioelectrical signals, wherein the measuring system comprises a common mode interference signal extracting circuit and a driving circuit connected to the extracting circuit configured to generate a first driving signal by both changing phases of a common mode interference signal and amplifying the common mode interference signal, wherein the method includes steps of:
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A. providing phase compensating and processing circuitry between the driving circuit and a living body on examination; B. receiving the first driving signal outputted from the driving circuit and a bioelectrical signal from the living body on examination by the phase compensating and processing circuitry; C. analyzing, by the phase compensating and processing circuitry, a characteristic of the bioelectrical signal and determining a phase compensation amount of the first driving signal outputted from the driving circuit, wherein the characteristic of the bioelectrical signal is represented by a characteristic value of a power frequency interference in the bioelectrical signal; D. performing, by the phase compensating and processing circuitry, a corresponding time delay processing on the first driving signal outputted by the driving circuit to generate a second driving signal, wherein the first driving signal outputted by the driving circuit is transmitted to a delayer for performing a corresponding time delay processing, which is controlled by a microprocessor and whose delay time is adjustable; and E. selectively transmitting, by the phase compensating and processing circuitry, based on a user selection, either the first driving signal or the second driving signal to the living body on examination. - View Dependent Claims (7, 8, 9, 10)
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Specification