KR20150057388A - Method and device to measure bio-signal with reduced common mode noise - Google Patents

Abstract

Disclosed are a bio-signal measuring device and method. The bio-signal measuring device according to one embodiment of the present invention removes a common mode noise from the sensed bio-signal by directly feeding back a common mode signal to a signal line through capacitive coupling. The signal line transmits the bio-signal sensed by an electrode part. A common mode signal applying unit directly applies the common mode signal to the signal line.

Description

METHOD AND DEVICE TO MEASURE BIO-SIGNAL WITH REDUCED COMMON MODE NOISE [0002]

A technique for measuring a living body signal is provided.

The body is a kind of conductor, and a very small amount of current is generated in the body. A biomedical signal indicative of the characteristics of the inside of the body can be measured by sensing a minute amount of current using an electrode attached to the body or detecting a change amount of current with respect to an external stimulus.

Generally, these principles can be used to determine the effects of ECG, electrocardiogram, electromyogram, EEG, Galvanic Skin Resistance, EOG, , Blood pressure and body motion, etc., and a bioelectrode is used to detect the change of the bio-signal.

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

According to one embodiment, a bio-signal measuring apparatus includes a signal line for transmitting a bio-signal sensed by an electrode unit, and a common mode signal extracted from a bio-signal , And a common mode signal applying unit for directly applying the signal to a signal line can be provided.

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

According to yet another embodiment, the signal line includes a first signal line and a second signal line, and the common mode signal applying unit is disposed adjacent to the first signal line along the first signal line to form a capacitive coupling with the first signal line And a second coupling portion disposed adjacent to the second signal line along the second signal line so as to form a capacitive coupling with the second signal line may be provided.

According to still another embodiment of the present invention, the common mode signal applying unit may include a coupling unit that forms a capacitive coupling with a signal line through a coil-like shape of a signal line.

According to still another embodiment, the common mode signal applying unit may further include an amplification unit that amplifies the common mode signal with a predetermined gain.

According to another embodiment, the electrode unit may be provided with a bio-signal measuring device including a capacitive coupling electrode (CCE).

According to an embodiment of the present invention, there is provided a bio-signal measuring system comprising: an electrode unit for detecting a bio-signal; a differential amplifier unit for extracting a common mode signal from the bio-signal; and a signal line for connecting the electrode unit and the differential amplifier unit, And a common-mode signal applying unit to which the common-mode signal applying unit is applied.

According to another embodiment, the differential amplification unit is provided with a biological signal measurement system including a signal processing unit for amplifying a differential mode signal of biological signals and processing the biological signal based on the amplified differential mode signal .

According to an embodiment of the present invention, there is provided a method of measuring a biological signal, comprising the steps of sensing a biological signal by an electrode unit, and directly applying a common mode signal extracted from a biological signal to a signal line for transmitting a biological signal from the electrode unit to the differential amplification unit A method of measuring a living body signal can be provided.

According to another embodiment of the present invention, a bio-signal measurement method including extracting a differential mode signal from a bio-signal to which a common mode signal is applied may be provided.

FIG. 1 is a view showing a bio-signal measurement using an electrode.
FIG. 2 is a diagram showing a configuration of a capacitive coupled active electrode (CCE).
3 is a view showing a detailed configuration of a bio-signal measurement system using a capacitively coupled active electrode.
4 is a view showing a grounding method of a bio-signal measurement system using a capacitively coupled active electrode.
5 is a diagram illustrating a system of a bio-signal measurement system according to an embodiment.
FIG. 6 is a diagram illustrating a detailed configuration of a bio-signal measurement system according to an embodiment.
7 is a diagram showing the grounding method.
8 is a view illustrating a coupling grounding method according to an embodiment.
FIG. 9 is a diagram showing a general configuration of a bio-signal measurement system according to an 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 the result of measurement of a living body signal by a signal processing system without a ground.
FIGS. 15A and 15B are diagrams showing the result of measurement of a living body signal by a signal processing system in which a human body has a bonding ground. FIG.
16A and 16B are diagrams illustrating a result of measurement of a living body signal by the signal processing system according to an embodiment.
17 is a flowchart illustrating a bio-signal measurement method according to an embodiment.

FIG. 1 is a view showing a bio-signal measurement using an electrode.

Hereinafter, the bio-signals will be referred to as ECG, electrocardiogram, EMG, electroencephalogram (EEG), galvanic skin resistance (GSR), electroogeography (EOG), body temperature, And body movements, and the like.

Such a biological signal can be measured by two paths by the electrode 110 shown in Fig. For example, a living body signal can be measured using a direct contact electrode or an indirect contact electrode. The direct contact electrode can measure the vital signal using a resistance path 111. [ The indirect contact electrode can measure the vital signal using a capacitance path 112. [

First, the biological signal can 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 sandpaper, foreign substances are removed with alcohol, and then bio- Can be detected.

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

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

와 같은 용량성 결합이 형성될 수 있다.2, the capacitive coupling active electrode includes an electrode surface 211 made of a metal plate, a pre-amplifier 213 provided behind the electrode surface 211, and an electrode surface 211 and an electrode surface 211 And a metal shield 212 surrounding the backside of the substrate 211. Here, when there is a garment 291 between the electrode surface 211 and the human body 290,

May 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.Stage amplifier 213 is connected to the input terminal of the first stage amplifier 213 and the ground terminal of the first stage amplifier 213 in order to pass a bias current to the amplifier element (e.g., a transistor or an operational amplifier) Resistance between (

) Can be connected. In the indirect contact bio-signal measurement, a high resistance (for example,

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

Lt; / RTI >

FIG. 3 is a view showing a detailed configuration of a bio-signal measurement system using the capacitively coupled active electrode 310.

Here, the bio-signal measurement system may include a capacitively coupled 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 a first stage amplifier 313 as shown in FIG. The electrode surface 311, shield 312 and first stage amplifier 313 may be similar to the electrode surface 211, shield 212 and first stage amplifier 213 of FIG.

The filter and amplifier 320 may filter and amplify the bio-signal sensed by the capacitively coupled active electrode 310 and transmit the filtered bio-signal to the signal processing unit 330.

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

The ground plane 340 may ground the shield 312 of the capacitively coupled active electrode 310 described above. The capacitive coupling active electrode 310 can detect a living body signal by using an amplification 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, since the outer 60 Hz noise is easily included in the detected bio-signal due to the garment 391, the noise can be blocked through the shielding 312. To this end, a ground plane 340 having a large area as shown in Fig. 3 may be required. For example, when the living body signal measuring apparatus is in the form of a chair, the area in which the human body 390 contacts the chair can be used as the ground plane 340.

4 is a view showing a grounding method of a bio-signal measurement system using a capacitively coupled active electrode.

When measuring a bio-signal (for example, an electrocardiogram), a right-leg driven circuit can 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. Here, the coupling ground 420 may be represented as RLD ground (Right-leg driven ground). Specifically, the common mode noise can 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 sensed biosignal may include a first biosignal and a second biosignal. The first bio-signal may comprise a first signal S1 and a common mode signal CM, and the second bio-signal may comprise a second signal S2 and a common mode signal CM. The first electrode 411 may sense the first biological signal, and the second electrode 412 may sense the second biological signal. In this case, the first electrode 411 and the second electrode 412 may be capacitively coupled active electrodes.

Here, the common mode signal CM is a common mode component commonly included in the first and second bio-signals detected by the first electrode 411 and the second electrode 412, for example, 60 Hz power source noise . The common mode signal CM can be extracted from each of the first and second bio-signals including the common mode signal CM through the circuit as shown in FIG. 4 by the differential amplifier 430. This common mode signal CM can be amplified by the amplification unit 421 and fed back to the human body over the garment 491 via the coupling ground 420.

Here, if the gain of the amplifying 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 grounding plane shown in FIG. 3 60Hz power noise can be reduced. In this case, the binding ground 420 may be indirectly brought into contact with the skin of the human body 490.

As described above, the capacitively coupled active electrode can measure the living body signal even on the clothes 491 without being directly attached to the skin. At this time, not only the capacitively coupled active electrode but also the coupling ground 420 for removing the common mode noise can be applied to the skin of the human body 490 through the capacitive coupling. For example, in order to maximize the effect of removing the noise from the coupling ground 420, the area of the coupling ground 420 may be enlarged to maximize the area of indirect contact with the human body 490.

At this time, when the living body signal (for example, electrocardiogram) is measured, the right leg driving circuit amplifies the common mode noise to, for example, 100 times or more and feeds back to the human body 490 through the coupling ground 420 have. In this case, the common mode noise (for example, 60 Hz power supply noise) can be effectively reduced even if the area of the coupling ground 420 is relatively small. However, since the bonding ground 420 must be indirectly brought into contact with the skin of the human body 490, there is a limitation in minimizing the size of the bio-signal measuring device. Techniques for further miniaturizing the size of the bio-signal 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 system of a bio-signal measurement system according to an embodiment.

The biological signal measurement system according to one embodiment may include a first electrode 511, a second electrode 512, a common mode signal applying unit 520, an amplification unit 521, and a differential amplification unit 530 . The first electrode 511, the second electrode 512, the amplification unit 521 and the differential amplification unit 530 are connected to the first electrode 411, the second electrode 412, the amplification unit 421 And the differential amplifying unit 430, respectively.

According to one embodiment, as shown in FIG. 5, the common mode signal CM amplified through the common mode signal applying unit 520 can be directly applied to a signal line. More 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.

In FIG. 5, the common mode signal CM is applied to the human body 590 through the capacitive coupling. In FIG. 5, the common mode signal CM is applied to the signal line through the capacitive coupling, The common mode signal CM can be fed back as an input of the common mode signal CM. 5, the position where the common mode signal CM is applied is not applied to the human body 590 but is applied to the signal line so that the human body 590 and the human body 590 over the clothing 591 It is possible to reduce the area of the living body signal measuring device which is in indirect contact.

5, only the first electrode 511 and the second electrode 512 are indirectly in contact with the human body 590, and a coupling ground that indirectly contacts the human body 590 as shown in Fig. 4 is not required, The size of the electrode portion including the electrode 511 and the second electrode 512 can be minimized.

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

According to one embodiment, the bio-signal measurement system 600 may include a bio-signal measurement apparatus 650, a differential amplification unit 630, and a signal processing unit 660. However, the present invention is not limited to this, and the biological signal measurement apparatus 650 may further include at least one of the differential amplification unit 630 and the signal processing unit 660. Here, the bio-signal measuring apparatus 650 may include an electrode unit 610, a signal line 640, and a common mode signal applying unit 620. At this time, the number of the signal lines 640 may correspond to the number of electrodes included in the electrode unit 610, and when the number of the electrodes and the signal line 640 is 2n (for example, n is an integer of 1 or more) The number of the unit 630 may be n.

The electrode unit 610 can sense a biological signal. Biological signals include, for example, ECG, electrocardiogram, EMG, electroencephalogram (EEG), galvanic skin resistance (GSR), electroogeography (EOG) , Blood pressure and body movements, and the like.

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 a sensed biological signal. According to one embodiment, a first electrode and a second electrode may be included. At this time, the electrode unit 610 may include a capacitively coupled active electrode.

The common mode signal applying unit 620 can directly apply the common mode signal extracted from the biological signal to the signal line 640. The common mode signal applying unit 620 may include a coupling unit (not shown) for forming a capacitive coupling with the signal line 640 and applying a common mode signal to the signal line 640 through the capacitive coupling formed, . ≪ / RTI > According to one embodiment, the common mode signal applying unit 620 may include an amplifying unit (not shown) for amplifying the common mode signal with a predetermined gain.

The common mode signal applying unit 620 includes 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, . ≪ / RTI > 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 one embodiment, when the signal line 640 includes the first signal line and the second signal line, the common mode signal applying unit 620 applies the first signal line and the second signal line to form a capacitive coupling with the first signal line, (Not shown) disposed adjacent to the first signal line and a second coupler (not shown) disposed adjacent to the second signal line along the second signal line to form a capacitive coupling with the second signal line, . Here, the first signal line and the second signal line may be disposed apart from each other by a predetermined distance as shown in FIG. 10, or may be disposed adjacent to each other as shown in FIG.

The number of the signal lines 640 and the coupling units (not shown) are not limited. When the number of the signal lines 640 is 2n, 2n coupling units (not shown) forming a capacitive coupling with the signal lines 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 through the shape of wrapping the signal line 640. For example, the common mode signal applying unit 620 may cover at least one signal line 640, and may cover all other signal lines 640, for example. 12 and 13 will be described in detail.

The differential amplification unit 630 can extract the common mode signal from the detected bio-signal. The extracted common mode signal may be fed back to the living body signal through the common mode signal applying unit 620. Also, the differential amplification unit 630 can extract and amplify the differential mode signal from the bio-signal to which the common mode signal is applied.

The signal line 640 may be connected to the electrode unit 610 and the differential amplification unit 630 to transmit the biological signal sensed by the differential amplification unit 630 from the electrode unit 610. According to one embodiment, the signal line 640 may include a first signal line for transmitting the first living body signal and a second signal line for transmitting the second living body 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 can process the biological signal to extract the waveform of the biological signal. Here, the signal processing unit 660 can process the biological signal sensed based on the differential mode signal amplified by the differential amplification unit 630. For example, when the biological signal is an electrocardiogram, the signal processing unit 660 can extract each feature point of the QPRST wave of the electrocardiogram based on the differential mode signal.

7 is a diagram showing the grounding method.

As shown in FIG. 7, the signal line 740 may be shielded by a ground to block the noise of the signal line 740. Specifically, the shield can be connected to the ground plane 720. In this case, a ground plane 720 having a large area as described above may be required.

8 is a diagram illustrating a coupling ground 820 scheme according to an embodiment.

According to one embodiment, in order to block the noise of the signal line 840, the signal line 840 may be surrounded by the common mode signal applying unit as shown in FIG. Here, the common mode signal applying unit may include a coupling unit that forms a capacitive coupling with the signal line 840, and the coupling unit may be a coupling ground 820. For example, the common mode signal applying unit can directly apply the common mode signal amplified by the amplifying unit 821 to the signal line 840. [ As described above, by applying the common mode signal directly to the signal line 840, the external noise included in the detected bio-signal (for example, power source noise) can be removed.

However, the shape of the coupling portion is not limited to the shape that wraps the signal line 840, and may include various shapes that enable the common mode signal application portion and the signal line 840 to form a capacitive coupling. More specifically, it will be described in detail in Figs. 9 to 13 below.

FIG. 9 is a diagram showing a general configuration of a bio-signal measurement system according to an embodiment.

As described above, the common mode signal extracted by the differential amplifier 960 is amplified by a predetermined gain (for example, 100) by the amplifying unit 921, and is amplified through the common mode signal applying unit 920, Lt; / RTI > The common mode signal applying unit 920 may apply the common mode signal through a coupling unit that forms 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 capacitive coupling with the first signal line 941 and the second signal line 942 through various coupling units. 10 to 13 will be described in detail.

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

According to one embodiment, the common mode signal applying unit can remove noise through various types of coupling parts including the shapes shown in FIGS. 10 to 13. For example, FIGS. 10 to 13 show a coupling portion (for example, coupling ground) for feeding back a common mode signal to a signal line.

According to one embodiment, the common mode noise generated in the first bio-signal and the second bio-signal is amplified by a predetermined gain (for example, 100), and then applied to the signal line through capacitive coupling to remove noise Can be removed. For example, the common mode noise can be removed even if the signal line is not shielded so as to surround the signal line and no external exposure occurs.

According to an embodiment, the common mode signal applying unit may include a coupling portion 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 can be assumed that the signal line includes the first signal lines 1041, 1141, 1241, and 1341 and the second signal lines 1042, 1142, 1242, and 1342. However, the present invention is not limited to this, and the number of signal lines may be 2n.

For example, the common mode signal applying unit may apply a common signal to the first signal lines 1041 and 1141 along the first signal lines 1041 and 1141 to form a capacitive coupling with the first signal lines 1041 and 1141 as shown in Figs. 10 and 11, The second signal lines 1042 and 1142 are arranged along the second signal lines 1042 and 1142 in order to form capacitive coupling with the first coupling portions 1021 and 1121 disposed adjacent to the first signal lines 1041 and 1141 and the second signal lines 1042 and 1142, And second coupling portions 1022 and 1122 that are disposed adjacent to the signal lines 1042 and 1142, respectively.

The first signal lines 1041 and 1141 and the second signal lines 1042 and 1142 may be spaced apart from each other by a predetermined distance as shown in Figure 10. The first couplers 1021 and 1121 are connected to the first signal line 1041 , 1141, and the second coupling portions 1022, 1122 may form a capacitive coupling with the second signal lines 1042, 1142. 11, the first signal lines 1041 and 1141 and the second signal lines 1042 and 1142 may be adjacent to each other. Also in this case, the first coupling parts 1021 and 1121 are connected to the first signal line The second coupling portions 1022 and 1122 may form a capacitive coupling with the second signal lines 1042 and 1142, respectively.

As another example, the common mode signal applying unit may include a coupling unit 1220 that forms a capacitive coupling with the signal line through a form of wrapping a signal line in a cylindrical shape as shown in FIG. In this case, the signal line may include a first signal line 1241 and a second signal line 1242, and the coupling portion 1220 may form a capacitive coupling with the first signal line 1241 and the second signal line 1242 . Here, the coupling portion 1220 may surround the entire signal line or cover 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 that forms a capacitive coupling with the signal line through a form of wrapping the signal line in a coil shape as shown in FIG. The signal line may include a first signal line 1341 and a second signal line 1342 and the coupling portion 1320 may include a first signal line 1341 and a second signal line 1342 through a coil- ) ≪ / RTI >

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

14A and 14B are diagrams showing a result of measurement of a living body signal by the signal processing system 1460 without a ground.

For example, a groundless signal processing system 1460 can measure the bio-signals of the human body 1490 over the garment 1491. As shown in FIG. 14B, the common mode noise is not removed, and it is difficult for the biological signal to be identified.

15A and 15B are diagrams showing a result of measurement of a living body signal by a signal processing system 1560 in which a human body 1590 has a bonding ground attached thereto.

For example, a signal processing system that indirectly attaches a coupling ground to the human body 1590 can measure the human body signal of the human body 1590 over the garment 1591. Unlike the above-described Fig. 14B, the common mode noise is removed, and the identification of the biological signal can be facilitated. Specifically, when the biological signal is, for example, an electrocardiogram, each characteristic point of the PQRST wave of the electrocardiogram can be easily identified.

16A and 16B are diagrams showing a result of measurement of a living body signal by the signal processing system 1660 according to an embodiment. Here, the signal processing system 1660 may include the differential amplification unit 630 and the signal processing unit 660 shown in FIG.

For example, a signal processing system 1660, according to one embodiment, can measure the vital sign of the human body 1690 over the garment 1691. 15A, the signal processing system 1660 according to one embodiment is capable of generating common mode noise through a common mode signal linkage forming a capacitive coupling with a signal line without coupling ground that is indirectly in contact with the human body 1690 Can be removed.

As shown in FIG. 16B, the signal processing system 1660 according to an embodiment can easily identify a biological signal without coupling grounding. For example, the SNR (Signal-to-Noise Ratio) is similar to FIG. 15B, and SNR can be sufficiently increased without bonding the coupling ground to the human body 1690.

17 is a flowchart illustrating a bio-signal measurement method according to an embodiment.

In step 1710, the electrode unit may sense the biological signal. The electrode portion may include a capacitively coupled active electrode. Here, the detected bio-signal may include a common mode noise (for example, 60 Hz power supply noise) in addition to a human body's inherent electrical signal.

In step 1720, the common mode signal may be applied to the common mode signal applying part. The common mode signal applying unit can directly apply the common mode signal to the signal line similarly to the above-described Figs. 9 to 13.

Here, the signal line connects the electrode unit and the differential amplification unit, and can transmit the sensed biosignal to the differential amplification unit. Further, the common mode signal can be extracted from the biological signal by the differential amplification unit.

Next, in step 1730, the differential amplification unit can extract the differential mode signal from the bio-signal to which the common mode signal is applied. The extracted differential mode signal can be used in the signal processing unit to process the biosignal as the common mode noise is removed in step 1720 described above.

The bio-signal measuring apparatus according to an embodiment can reduce the area of the coupling ground or remove the coupling ground when the living body signal needs to be measured through indirect contact with a small contact surface such as a wearable sensor. This makes it possible to increase the size of the electrode relatively, within a limited form factor of the bio-signal measuring device.

For example, in a form factor of a bio-signal measuring device, the size of the capacitively coupled active electrode can be secured by the space in which the ground plane is removed. Alternatively, the size of the bio-signal measuring device can be minimized by the space from which the ground plane is removed.

The bio-signal measuring apparatus according to an embodiment can effectively detect a bio-signal using a capacitively coupled active electrode when a space permitting sensing in a human body is narrow.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

600: Biological signal measurement system
610:
620: Common mode signal applying unit
630:
640: Signal line
650: Biological signal measuring device
660:

Claims (19)

A bio-signal measuring apparatus comprising:
A signal line for transmitting a bio-signal sensed by the electrode unit; And
A common mode signal applying unit for directly applying a common mode signal extracted from the bio-signal to the signal line;
And a biosignal measuring device. The method according to claim 1,
Wherein the common mode signal applying unit comprises:
A capacitive coupler for coupling the common line signal to the signal line through the capacitive coupling,
And a biosignal measuring device. The method according to claim 1,
Wherein the common mode signal applying unit comprises:
A plurality of signal lines which are arranged adjacent to the signal lines along the signal lines by a predetermined length in order to form capacitive coupling with the signal lines,
And a biosignal measuring device. The method according to claim 1,
Wherein:
The first signal line and the second signal line
/ RTI >
Wherein the common mode signal applying unit comprises:
A first coupler disposed adjacent to the first signal line along the first signal line to form a capacitive coupling with the first signal line; And
A second signal line and a second signal line, the second signal line being disposed adjacent to the second signal line to form a capacitive coupling with the second signal line;
And a biosignal measuring device. The method according to claim 1,
Wherein the common mode signal applying unit comprises:
A coupling part forming a capacitive coupling with the signal line through a shape of wrapping the signal line in a cylindrical shape,
And a biosignal measuring device. The method according to claim 1,
Wherein the common mode signal applying unit comprises:
And a coupling portion which forms a capacitive coupling with the signal line through a shape of wrapping the signal line in a coil-
And a biosignal measuring device. The method according to claim 1,
Wherein the common mode signal applying unit comprises:
An amplifying unit for amplifying the common mode signal with a predetermined gain,
Further comprising: The method according to claim 1,
The electrode unit includes:
A capacitive coupling electrode (CCE)
And a biosignal measuring device. In a biological signal measurement system,
An electrode unit for sensing a biological signal;
A differential amplifier for extracting a common mode signal from the bio-signal; And
A common mode signal applying unit for directly applying the common mode signal to a signal line connecting the electrode unit and the differential amplifier unit,
And a bio-signal measurement system. 10. The method of claim 9,
Wherein the common mode signal applying unit comprises:
A capacitive coupler for coupling the common line signal to the signal line through the capacitive coupling,
And a bio-signal measurement system. 10. The method of claim 9,
Wherein the common mode signal applying unit comprises:
A plurality of signal lines which are arranged adjacent to the signal lines along the signal lines by a predetermined length in order to form capacitive coupling with the signal lines,
And a bio-signal measurement system. 10. The method of claim 9,
Wherein:
The first signal line and the second signal line
/ RTI >
Wherein the common mode signal applying unit comprises:
A first coupler disposed adjacent to the first signal line along the first signal line to form a capacitive coupling with the first signal line; And
A second signal line and a second signal line, the second signal line being disposed adjacent to the second signal line to form a capacitive coupling with the second signal line;
And a bio-signal measurement system. 10. The method of claim 9,
Wherein the common mode signal applying unit comprises:
A coupling part forming a capacitive coupling with the signal line through a shape of wrapping the signal line in a cylindrical shape,
And a bio-signal measurement system. 10. The method of claim 9,
Wherein the common mode signal applying unit comprises:
And a coupling portion which forms a capacitive coupling with the signal line through a shape of wrapping the signal line in a coil-
And a bio-signal measurement system. 10. The method of claim 9,
An amplifying unit for amplifying the common mode signal with a predetermined gain and providing the same as the signal line,
Further comprising a bio-signal measuring system. 10. The method of claim 9,
The electrode unit includes:
A capacitive coupling electrode (CCE)
Wherein the biological signal measurement system comprises: 10. The method of claim 9,
Wherein the differential amplifier comprises:
Amplifying a differential mode signal of the bio-signals,
A signal processor for processing the bio-signal based on the amplified differential mode signal,
And a bio-signal measurement system. A method for measuring a biological signal,
Sensing an electrode unit biosignal;
Directly applying a common mode signal extracted from the biological signal to a signal line for transmitting the biological signal from the electrode unit to the differential amplification unit
Wherein the bio-signal measuring method comprises the steps of: 19. The method of claim 18,
Extracting a differential mode signal from the bio-signal to which the common mode signal is applied
Wherein the bio-signal measuring method comprises the steps of:

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