KR102194232B1 - Method and device to measure bio-signal with reduced common mode noise - Google Patents

Abstract

An apparatus and method for measuring a vital signal are disclosed. The apparatus for measuring a bio-signal according to an embodiment may remove common-mode noise from the detected bio-signal by directly feeding back a common-mode signal to a signal line through capacitive coupling.

Description

Bio-signal measurement device and method to reduce common mode noise {METHOD AND DEVICE TO MEASURE BIO-SIGNAL WITH REDUCED COMMON MODE NOISE}

Techniques for measuring vital signs are provided.

The body is a kind of conductor, and a large amount of current is generated in the body. A small amount of current may be sensed using an electrode attached to the body, or a change amount of current due to an external stimulus may be sensed to measure a biosignal representing a characteristic inside the body.

In general, using these principles, ECG (electrocardiogram), electromyogram (EMG, electromyogram), electroencephalogram (EEG), skin resistance (GSR), eye movement (EOG, Electrooculography), body temperature, pulse rate. , Blood pressure and body movements can be measured, and a biometric electrode is used to detect changes in such biometric signals.

The biometric electrode is attached to the user's skin and at the same time affects the quality and user convenience of the biosignal measured as a medium that connects to the measurement system. In order to measure a bio-signal while always being attached to the user's body in daily life, it is necessary to solve technical problems such as measurement accuracy, communication, power, etc., and convenience of use is required.

According to an embodiment, in the biosignal measuring apparatus, a signal line for transmitting a bio-signal detected by the electrode unit and a common mode signal extracted from the biosignal are used. , A common mode signal applying unit directly applied to a signal line, and a bio-signal measuring apparatus may be provided.

According to another embodiment, the common mode signal applying unit may provide a biosignal measuring apparatus including a coupling unit that forms a capacitive coupling with a signal line and applies a common mode signal to the signal line through capacitive coupling. have.

According to another embodiment, the common mode signal applying unit may provide a biosignal measuring apparatus including a coupling unit disposed adjacent to the signal line along the signal line by a predetermined length to form a capacitive coupling with the signal line.

According to another embodiment, the signal line includes a first signal line and a second signal line, and the common mode signal applying unit is adjacent to the first signal line along the first signal line in order to form a capacitive coupling with the first signal line. A biosignal measuring apparatus including a first coupling part disposed and a second coupling part disposed adjacent to the second signal line along the second signal line to form a capacitive coupling with the second signal line may be provided.

According to another embodiment of the present invention, the common mode signal applying unit may be provided with a biosignal measuring apparatus including a coupling unit that forms a capacitive coupling with the signal line by wrapping the signal line in a coil shape.

According to another embodiment, the common mode signal applying unit may provide a biosignal measuring apparatus further comprising an amplifying unit for amplifying the common mode signal with a predetermined gain.

According to another embodiment, the electrode unit may be provided with a biosignal measuring apparatus including a capacitive coupling electrode (CCE).

According to an embodiment, in the biosignal measurement system, an electrode unit for detecting a biosignal, a differential amplifying unit for extracting a common mode signal from the biosignal, and a signal line connecting the electrode unit and the differential amplifying unit are used to directly transmit a common mode signal. A biosignal measurement system including a common mode signal applying unit to be applied may be provided.

According to another embodiment, the differential amplification unit amplifies a differential mode signal among bio signals, and a biosignal measurement system including a signal processor for processing a biosignal based on the amplified differential mode signal. I can.

According to an embodiment, in the biosignal measurement method, the electrode unit detects the biosignal, and a signal line for transmitting the biosignal from the electrode unit to the differential amplification unit, comprising the step of directly applying a common mode signal extracted from the biosignal. A method of measuring a biological signal may be provided.

According to another embodiment, a biosignal measuring method including extracting a differential mode signal from a biosignal to which a common mode signal is applied may be provided.

1 is a diagram showing a measurement of a living body signal using an electrode.
2 is a diagram showing the configuration of a capacitive coupled active electrode (CCE).
3 is a diagram showing a detailed configuration of a system for measuring a living body signal using a capacitively coupled active electrode.
4 is a diagram showing a grounding method of a biosignal measurement system using a capacitively coupled active electrode.
5 is a diagram illustrating a method of a bio-signal measuring system according to an exemplary embodiment.
6 is a diagram illustrating a detailed configuration of a system for measuring a biometric signal according to an exemplary embodiment.
7 is a diagram showing a grounding method.
8 is a diagram illustrating a combined grounding method according to an embodiment.
9 is a diagram illustrating a schematic configuration of a system for measuring a biometric signal according to an exemplary embodiment.
10 to 13 are diagrams illustrating examples of a common mode signal applying unit according to an embodiment.
14A and 14B are diagrams showing a result of measuring a biosignal by a signal processing system without a ground.
15A and 15B are diagrams illustrating a result of measuring a biological signal by a signal processing system having a bonded ground attached to a human body.
16A and 16B are diagrams illustrating a result of measuring a biosignal by a signal processing system according to an exemplary embodiment.
17 is a flowchart illustrating a method of measuring a biosignal according to an embodiment.

1 is a diagram showing a measurement of a living body signal using an electrode.

Hereinafter, the biological signals are electrocardiogram (ECG), electromyogram (EMG), electroencephalogram (EEG), galvanic skin resistance (GSR), eye movement (EOG, Electrooculography), body temperature, pulse, blood pressure. And body movements.

Such a biosignal may be measured in two paths by the electrode 110 shown in FIG. 1. For example, a biosignal may be measured using a direct contact electrode or an indirect contact electrode. The direct contact electrode may measure a biosignal using a resistance path 111. The indirect contact electrode may measure a biosignal using a capacitive path 112.

First, the biosignal may be measured through the resistance path 111 according to the RC model between the skin 190 and the electrode 110. In this case, in order to reduce the resistance R between the electrode 110 and the skin 190, for example, the skin 190 is rubbed with sand paper, foreign substances are removed with alcohol, and then the biometric signal through an electrolyte having good conductivity, etc. Can be detected.

In addition, the biosignal may be measured through a capacitance path 112 according to a capacitive coupling formed between the skin 190 and the electrode 110 of the human body. In this case, since the capacitive path is used, even if an insulator exists between the skin 190 and the electrode 110, a biosignal can be measured. The electrode 110 used in the capacitive path may include, for example, a capacitive coupled active electrode (CCE). The capacitive coupling active electrode will be described in detail in FIG. 2 below.

2 is a diagram showing the configuration of a capacitive coupled active electrode (CCE).

와 같은 용량성 결합이 형성될 수 있다.As shown in FIG. 2, the capacitive coupling active electrode includes an electrode surface 211 made of a metal plate, a pre-amplifier 213 installed behind the electrode surface 211, and the electrode surface 211 and the electrode surface ( It may include a metal shield (shield) 212 surrounding the back side of 211). Here, when there is a clothing 291 between the electrode surface 211 and the human body 290, as shown in FIG.

Capacitive bonds such as can be formed.

)을 연결할 수 있다. 간접 접촉 생체 신호 측정에서는 증폭기 입력 임피던스를 크게 하기 위해 높은 저항(예를 들면

이상의 저항)을 사용할 수 있다. 여기서, 전극면(211)과 접지간에는 표유정전용량(stray capacitance)

가 존재할 수 있다.According to an embodiment, in order to stabilize the amplifier element by passing a bias current to an amplifier element (for example, a transistor or an operational amplifier) of the first amplifier 213, the input terminal and the ground of the first amplifier 213 Between resistance(

) Can be connected. In indirect contact bio-signal measurements, high resistance (e.g.,

Above resistance) can be used. Here, stray capacitance between the electrode surface 211 and the ground

May exist.

3 is a diagram showing a detailed configuration of a system for measuring a physiological signal using a capacitively coupled active electrode 310.

Here, the bio-signal measurement system may include a capacitive coupling active electrode 310, a filter and an amplifier 320, a signal processing unit 330, and a ground plane 340. For example, the ground plane can be represented by GND.

The capacitive coupling active electrode 310 may include an electrode surface 311, a shield 312, and an ultra-short amplifier 313 as shown in FIG. 3. The electrode surface 311, the shield 312, and the ultra-short amplifier 313 may be similar to the electrode surface 211, the shield 212, and the ultra-short amplifier 213 of FIG. 2 described above.

The filter and amplifier 320 may filter and amplify the bio-signal detected by the capacitive coupling active electrode 310 and transmit it to the signal processing unit 330.

The signal processing unit 330 may process the bio-signal to extract a waveform of the bio-signal. For example, when the biological signal is an electrocardiogram, the signal processing unit 330 may extract each feature point of the QPRST wave of the electrocardiogram.

The ground plane 340 may ground the shield 312 of the capacitive coupling active electrode 310 described above. The capacitive coupling active electrode 310 may detect a biosignal by using an amplifying element having a high input impedance as the first-stage amplifier 313 in order to maximize the capacitance of the contact surface. At this time, external 60Hz noise due to the clothing 391 is easily included in the detected biosignal, and thus the corresponding noise can be blocked through the shielding 312. To this end, as shown in FIG. 3, a ground plane 340 having a large area may be required. For example, when the biosignal measuring device is in the form of a chair, an area in which the human body 390 contacts the chair may be used as the ground plane 340.

4 is a diagram showing a grounding method of a biosignal measurement system using a capacitively coupled active electrode.

When measuring a living body signal (eg, an electrocardiogram), a right-leg driven circuit may feedback common mode noise to the human body 490. For example, the common mode noise may be fed back to the human body 490 through a coupling ground 420 that forms a capacitive coupling with the human body 490 as shown in FIG. 4. Here, the coupled ground 420 may be represented as a RLD ground (Right-leg driven ground). Specifically, the common mode noise may be fed back to the human body 490 as follows. Hereinafter, the common mode noise may be represented by a common mode signal CM or a common mode component.

For example, the detected biosignal may include a first biosignal and a second biosignal. The first biosignal may include a first signal S1 and a common mode signal CM, and the second biosignal may include a second signal S2 and a common mode signal CM. The first electrode 411 may sense a first bio signal, and the second electrode 412 may sense a second bio signal. In this case, the first electrode 411 and the second electrode 412 may be capacitive coupling active electrodes.

Here, the common mode signal CM is a common mode component commonly included in the first and second bio signals sensed by the first electrode 411 and the second electrode 412, for example, 60Hz power supply noise. Can include. In addition, the common mode signal CM may be extracted by the differential amplification unit 430 from each of the first and second bio signals including the common mode signal CM through a circuit as shown in FIG. 4. The common mode signal CM may be amplified by the amplifying unit 421 and fed back to the human body over the clothing 491 through the coupling ground 420.

Here, when the gain of the amplification unit is set to, for example, 100 times or more and the amplified common mode noise is fed back to the human body 490, the combined ground 420 having a smaller area than the ground plane shown in FIG. 60Hz power supply noise can be reduced. In this case, it may be necessary to indirectly contact the bonding ground 420 with the skin of the human body 490.

As described above, the capacitively coupled active electrode is not directly attached to the skin and can measure a biosignal even on the garment 491. In this case, not only the capacitive coupling active electrode but also the coupling ground 420 for removing common mode noise may be applied to the skin of the human body 490 through capacitive coupling. For example, in order to maximize the effect of the combined ground 420 removing noise, the area of the combined ground 420 may be increased to maximize an area of indirect contact with the human body 490.

At this time, when measuring a living body signal (e.g., electrocardiogram), the right leg drive circuit amplifies the common mode noise by, for example, 100 times or more, and feeds it back to the human body 490 through the coupling ground 420. have. In this case, even if the area of the coupling ground 420 is relatively small, common mode noise (eg, 60 Hz power supply noise) can be effectively reduced. However, since the bonding ground 420 must be indirectly contacted with the skin of the human body 490, there may be limitations in minimizing the size of the biosignal measuring device. A technique for reducing the size of the biosignal measuring device will be described in detail below.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings.

5 is a diagram illustrating a method of a bio-signal measuring system according to an exemplary embodiment.

The biosignal measurement system according to an embodiment may include a first electrode 511, a second electrode 512, a common mode signal applying unit 520, an amplifying unit 521, and a differential amplifying unit 530. . The first electrode 511, the second electrode 512, the amplifying part 521, and the differential amplifying part 530 are the first electrode 411, the second electrode 412, and the amplifying part 421 of FIG. 4 described above. ) And the differential amplification unit 430, respectively.

According to an embodiment, as shown in FIG. 5, the amplified common mode signal CM through the common mode signal applying unit 520 may be directly applied to a signal line. Specifically, the common mode signal applying unit 520 may form a capacitive coupling with the signal line to apply the common mode signal CM to the signal line.

Here, unlike in FIG. 4 in which the common mode signal CM is directly applied to the human body 590 through capacitive coupling, in FIG. 5, the common mode signal CM is applied to the signal line through capacitive coupling, so that the differential amplifier 530 The common mode signal CM can be fed back through the input of. Accordingly, the biosignal measurement system shown in FIG. 5 does not set the position where the common mode signal CM is applied to the human body 590, but is applied to the signal line, unlike FIG. 4, so that the body 590 and the human body 590 over the clothing 591 It is possible to reduce the area of the bio-signal measuring device in indirect contact.

For example, in FIG. 5, only the first electrode 511 and the second electrode 512 indirectly contact the human body 590, and as in FIG. 4, a combined grounding indirect contact with the human body 590 is not required. The size of the electrode portion including the electrode 511 and the second electrode 512 may be further minimized.

6 is a diagram showing a detailed configuration of a bio-signal measuring system 600 according to an embodiment.

According to an embodiment, the biosignal measurement system 600 may include a biosignal measurement device 650, a differential amplification unit 630, and a signal processing unit 660. However, the present invention is not limited thereto, and the biosignal measuring apparatus 650 may further include at least one of a differential amplifying unit 630 and a signal processing unit 660. Here, the biosignal measuring apparatus 650 may include an electrode unit 610, a signal line 640, and a common mode signal applying unit 620. In this case, the number of signal lines 640 may correspond to the number of electrodes included in the electrode unit 610, and when the number of electrodes and signal lines 640 is 2n (for example, n is an integer greater than or equal to 1), differential amplification There may be n parts 630.

The electrode unit 610 may detect a biosignal. Vital signals include, for example, electrocardiogram (ECG), electromyogram (EMG), electroencephalogram (EEG), galvanic skin resistance (GSR), eye movement (EOG, Electrooculography), body temperature, pulse rate. , Blood pressure, and body movements.

Here, the electrode unit 610 may include at least one electrode. For example, an even number of electrodes may be included to extract a differential mode signal and a common mode signal of the sensed bio-signal. According to an embodiment, a first electrode and a second electrode may be included. In this case, the electrode unit 610 may include a capacitive coupling active electrode.

The common mode signal applying unit 620 may directly apply the common mode signal extracted from the biosignal to the signal line 640. According to an embodiment, the common mode signal applying unit 620 forms a capacitive coupling with the signal line 640 and applies a common mode signal to the signal line 640 through the formed capacitive coupling (not shown). It may include. According to an embodiment, the common mode signal applying unit 620 may include an amplifying unit (not shown) that amplifies the common mode signal with a predetermined gain.

Specifically, the common mode signal applying unit 620 is a coupling unit (not shown) disposed adjacent to the signal line 640 along the signal line 640 by a predetermined length to form a capacitive coupling with the signal line 640 It may include. For example, the predetermined length may be equal to or shorter than the length of the signal line 640 connecting the electrode unit 610 and the differential amplification unit 630.

According to an embodiment, when the signal line 640 includes a first signal line and a second signal line, the common mode signal applying unit 620 is configured to form a capacitive coupling with the first signal line. 1 In order to form a capacitive coupling with a first coupling portion (not shown) and a second signal line disposed adjacent to the signal line, a second coupling portion (not shown) disposed adjacent to the second signal line was provided along the second signal line. Can include. Here, the first signal line and the second signal line may be spaced apart from each other by a predetermined distance or more as shown in FIG. 10 below, or may be disposed adjacent to each other as shown in FIG. 11 below.

However, the number of the signal lines 640 and the coupler (not shown) is not limited, and when the signal line 640 is 2n, 2n couplers (not shown) forming a capacitive coupling with each signal line 640 May be disposed adjacent to each signal line 640.

According to another embodiment, the common mode signal applying unit 620 may form a capacitive coupling with the signal line 640 by surrounding the signal line 640. For example, the common mode signal applying unit 620 may wrap at least one or more signal lines 640, for example, all signal lines 640. Specifically, it will be described in detail in FIGS. 12 and 13 below.

The differential amplification unit 630 may extract a common mode signal from the detected biosignal. The extracted common mode signal may be fed back as a biosignal through the common mode signal applying unit 620. In addition, the differential amplification unit 630 may extract and amplify the differential mode signal from the biosignal to which the common mode signal is applied.

The signal line 640 is connected to the electrode unit 610 and the differential amplification unit 630 described above, and may transmit a biosignal sensed from the electrode unit 610 to the differential amplification unit 630. According to an embodiment, the signal line 640 may include a first signal line for transmitting a first bio-signal and a second signal line for transmitting a second bio-signal. Here, the first bio-signal and the second bio-signal may include a common mode signal together with a first signal and a second signal, respectively.

The signal processing unit 660 may process the biosignal to extract a waveform of the biosignal. Here, the signal processing unit 660 may process the detected biosignal based on the differential mode signal amplified by the differential amplification unit 630. For example, when the biosignal is an electrocardiogram, the signal processing unit 660 may extract each feature point of the QPRST wave of the electrocardiogram based on the differential mode signal.

7 is a diagram showing a grounding method.

In order to block noise from the signal line 740, as shown in FIG. 7, the signal line 740 may be shielded with a ground. Specifically, the shielding may be connected to the ground plane 720. In this case, as described above, a ground plane 720 having a large area may be required.

8 is a diagram illustrating a combined grounding 820 method according to an embodiment.

According to an embodiment, in order to block noise of the signal line 840, the signal line 840 may be wrapped with a common mode signal applying unit as illustrated in FIG. 8. Here, the common mode signal applying unit may include a coupling portion forming a capacitive coupling with the signal line 840, and the coupling portion may be a coupling ground 820. For example, the common mode signal applying unit may directly apply the common mode signal amplified by the amplifying unit 821 to the signal line 840. As described above, by directly applying the common mode signal to the signal line 840, external noise (eg, power supply noise) included in the detected biosignal may be removed.

However, the shape of the coupling portion is not limited to a shape that completely surrounds the signal line 840, and may include various shapes in which the signal line 840 and the common mode signal applying portion can form a capacitive coupling. Specifically, it will be described in detail in FIGS. 9 to 13 below.

9 is a diagram illustrating a schematic configuration of a system for measuring a biometric signal according to an exemplary embodiment.

As described above, the common mode signal extracted from the differential amplification unit 960 is amplified by a predetermined gain (for example, 100) by the amplification unit 921, and the signal line is transmitted through the common mode signal applying unit 920. Can be applied as. The common mode signal applying unit 920 may apply a common mode signal through a coupling unit forming a capacitive coupling with the signal line. For example, the signal line may include a first signal line 941 and a second signal line 942.

Here, the common mode signal applying unit 920 may form a capacitive coupling with the first signal line 941 and the second signal line 942 through various types of coupling portions. Specifically, it will be described in detail in FIGS. 10 to 13 below.

10 to 13 are diagrams illustrating examples of a common mode signal applying unit according to an embodiment.

According to an embodiment, the common mode signal applying unit may remove noise through various types of coupling units including the shapes shown in FIGS. 10 to 13. For example, FIGS. 10 to 13 may show a coupling unit (eg, a coupling ground) that feeds back a common mode signal through a signal line.

According to an embodiment, the common mode noise generated from the detected first and second biological signals is amplified with a predetermined gain (for example, 100), and then applied to the signal line through capacitive coupling to reduce noise. Can be removed. For example, common mode noise can be removed even if the signal line is surrounded and shielded so that there is no external exposure.

According to an embodiment, the common mode signal applying unit may include a coupling unit disposed adjacent to the signal line along the signal line by a predetermined length to form a capacitive coupling with the signal line. Hereinafter, it may be assumed that the signal lines include first signal lines 1041, 1141, 1241, and 1341 and second signal lines 1042, 1142, 1242, and 1342. However, the present invention is not limited thereto, and the number of signal lines may be 2n.

For example, as shown in FIGS. 10 and 11, the common mode signal applying unit is provided with a first signal line along the first signal lines 1041 and 1141 in order to form a capacitive coupling with the first signal lines 1041 and 1141. In order to form a capacitive coupling with the first coupling portions 1021 and 1121 disposed adjacent to the (1041, 1141), and the second signal lines 1042, 1142, the second signal lines 1042 and 1142 It may include second coupling units 1022 and 1122 disposed adjacent to the signal lines 1042 and 1142.

Here, the first signal lines 1041 and 1141 and the second signal lines 1042 and 1142 may be spaced apart by a predetermined distance as shown in FIG. 10, and the first coupler 1021 and 1121 may be a first signal line 1041. , 1141), and the second coupling portions 1022 and 1122 may form a capacitive coupling with the second signal lines 1042 and 1142. In addition, as shown in FIG. 11, the first signal lines 1041 and 1141 and the second signal lines 1042 and 1142 may be adjacent to each other, and even in this case, the first coupler 1021 and 1121 may be a first signal line. (1041, 1141), the second coupling portions (1022, 1122) may form a capacitive coupling with the second signal lines (1042, 1142).

For another example, the common mode signal applying unit may include a coupling unit 1220 forming a capacitive coupling with the signal line by enclosing the signal line in a cylindrical shape as shown in FIG. 12. In this case, the signal line may include a first signal line 1241 and a second signal line 1242, and the coupling unit 1220 may form a capacitive coupling with the first signal line 1241 and the second signal line 1242. I can. Here, the coupling part 1220 may surround the entire signal line or a part of the signal line by a predetermined length.

As another example, the common mode signal applying unit may include a coupling unit 1320 forming a capacitive coupling with the signal line by wrapping the signal line in a coil shape as shown in FIG. 13. Here, the signal line may include a first signal line 1341 and a second signal line 1342, and the coupling unit 1320 is a first signal line 1341 and a second signal line 1342 through a coil type or a coil-like shape. ) And can form a capacitive bond.

However, the shape of the coupling portion is not limited to the shape of FIGS. 10 to 13 described above, and may include any shape capable of forming a capacitive coupling with a signal line.

14A and 14B are diagrams illustrating a result of measuring a biosignal by the signal processing system 1460 without ground.

For example, the groundless signal processing system 1460 may measure a biosignal of the human body 1490 over the garment 1491. As shown in FIG. 14B, since common mode noise is not removed, it may be difficult to identify a biosignal.

15A and 15B are diagrams illustrating a result of measuring a biological signal by a signal processing system 1560 having a bonded ground attached to the human body 1590.

For example, a signal processing system that indirectly attaches a bonding ground to the human body 1590 may measure a biosignal of the human body 1590 over the clothing 1591. Unlike FIG. 14B described above, since common mode noise is removed, it is possible to easily identify a biosignal. Specifically, when the biosignal is an electrocardiogram, for example, each feature point of the PQRST wave of the electrocardiogram can be easily identified.

16A and 16B are diagrams illustrating a result of measuring a biosignal by the signal processing system 1660 according to an exemplary embodiment. Here, the signal processing system 1660 may include a differential amplifying unit 630 and a signal processing unit 660 shown in FIG. 6.

For example, the signal processing system 1660 according to an embodiment may measure a biosignal of the human body 1690 over the clothing 1691. Unlike FIG. 15A described above, the signal processing system 1660 according to an exemplary embodiment reduces common mode noise through a common mode signal linking unit that forms a capacitive coupling with a signal line without a coupling ground contacting the human body 1690 indirectly. Can be removed.

As shown in FIG. 16B, in the signal processing system 1660 according to an exemplary embodiment, a biosignal can be easily identified without a bonding ground. For example, since the signal-to-noise ratio (SNR) is similar to that of FIG. 15B, it is possible to sufficiently increase the SNR without bonding the coupling ground to the human body 1690.

17 is a flowchart illustrating a method of measuring a biosignal according to an embodiment.

In step 1710, the electrode unit may detect the biosignal. The electrode portion may include a capacitive coupling active electrode. The biosignal detected here may include common mode noise (eg, 60Hz power supply noise) in addition to an electrical signal inherent to the human body.

In step 1720, the common mode signal applying unit may apply the common mode signal to the signal line. The common mode signal applying unit may directly apply the common mode signal to the signal line similar to the above-described FIGS. 9 to 13.

Here, the signal line connects between the electrode unit and the differential amplification unit, and may transmit the detected biosignal to the differential amplification unit. In addition, the common mode signal may be extracted from the biosignal by the differential amplifier.

Subsequently, in step 1730, the differential amplification unit may extract the differential mode signal from the biosignal to which the common mode signal is applied. The extracted differential mode signal is obtained by removing the common mode noise in step 1720 described above, and may be used by the signal processor to process the biosignal.

The biosignal measuring apparatus according to an embodiment may reduce the area of the bonded ground or remove the bonded ground when it is necessary to measure the biosignal through indirect contact on a small contact surface such as a wearable sensor. Through this, it is possible to relatively increase the size of the electrode within a limited form factor of the biosignal measuring apparatus.

For example, in the form factor of the biosignal measuring apparatus, the size of the capacitive coupling active electrode can be secured as much as the space from which the ground plane is removed. Alternatively, the size of the biosignal measuring apparatus may be minimized as much as the space where the ground plane is removed.

The biosignal measuring apparatus according to an embodiment may effectively detect a biosignal using a capacitive coupling active electrode when a space in which sensing is allowed in a human body is narrow.

As described above, although the embodiments have been described by the limited embodiments and drawings, various modifications and variations are possible from the above description by those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and claims and equivalents fall within the scope of the claims to be described later.

600: vital signal measurement system
610: electrode part
620: common mode signal applying unit
630: differential amplifier
640: signal line
650: biological signal measuring device
660: signal processing unit

Claims (19)

In the biological signal measuring device,
A signal line for transmitting a bio-signal detected by the electrode unit; And
A common mode signal applying unit for directly applying a common mode signal extracted from the biological signal to the signal line;
Including,
The common mode signal applying unit,
Comprising a coupling portion forming a capacitive coupling with the signal line through a form surrounding the signal line in a coil shape,
Bio-signal measurement device. The method of claim 1,
The coupling part,
Applying the common mode signal to the signal line through the capacitive coupling,
Bio-signal measurement device. The method of claim 1,
The coupling part,
Arranged adjacent to the signal line along the signal line by a predetermined length to form a capacitive coupling with the signal line,
Bio-signal measurement device. The method of claim 1,
The signal line,
1st signal line and 2nd signal line
Including,
The coupling part,
The first signal line and the second signal line are disposed adjacent to each other while surrounding the first signal line and the second signal line in a coil shape to form a capacitive coupling with the first signal line and the second signal line,
Bio-signal measurement device. delete delete The method of claim 1,
The common mode signal applying unit,
An amplification unit that amplifies the common mode signal with a predetermined gain
Bio-signal measurement device further comprising a. The method of claim 1,
The electrode part,
Capacitive coupling electrode (CCE)
Bio-signal measuring device comprising a. In the biological signal measurement system,
An electrode unit for sensing a living body signal;
A differential amplifier for extracting a common mode signal from the biosignal; And
A signal line connecting the electrode unit and the differential amplification unit, and a common mode signal applying unit for directly applying the common mode signal
Including,
The common mode signal applying unit,
Comprising a coupling portion forming a capacitive coupling with the signal line through a form surrounding the signal line in a coil shape,
Vital signal measurement system. The method of claim 9,
The coupling part,
Applying the common mode signal to the signal line through the capacitive coupling,
Bio-signal measurement system. The method of claim 9,
The coupling part,
Arranged adjacent to the signal line along the signal line by a predetermined length to form a capacitive coupling with the signal line,
Bio-signal measurement system. The method of claim 9,
The signal line,
1st signal line and 2nd signal line
Including,
The coupling part,
The first signal line and the second signal line are disposed adjacent to each other while surrounding the first signal line and the second signal line in a coil shape to form a capacitive coupling with the first signal line and the second signal line,
Bio-signal measurement system. delete delete The method of claim 9,
An amplification unit that amplifies the common mode signal with a predetermined gain and provides it to the signal line
Bio-signal measurement system further comprising a. The method of claim 9,
The electrode part,
Capacitive coupling electrode (CCE)
Bio-signal measurement system comprising a. The method of claim 9,
The differential amplification unit,
Amplifying a differential mode signal among the bio signals,
Signal processing unit processing the bio-signal based on the amplified differential mode signal
Bio-signal measurement system comprising a. In the biosignal measurement method,
Sensing a bio-signal by an electrode unit;
Directly applying a common mode signal extracted from the biosignal to a signal line for transmitting the biosignal from the electrode unit to the differential amplification unit
Including,
The step of directly applying the extracted common mode signal,
Comprising the step of directly applying the extracted common mode signal by forming a capacitive coupling with the signal line through a form surrounding the signal line in a coil shape,
How to measure vital signs. The method of claim 18,
Extracting a differential mode signal from the biosignal to which the common mode signal is applied
Bio-signal measurement method comprising a.

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