Electrical signal measuring device and electrical signal measuring system

Abstract

Provided are an electric signal measurement device and an electric signal measurement system for accurately measuring electric signals of a plurality of modes.　This technology provides an electric signal measurement device and an electric signal measurement system. The electric signal measurement device is provided with at least: a plurality of electrodes for applying electric signals to a living body and / or detecting the electric signals from the living body; a plurality of electric signal measurement units for measuring the electric signals detected by the electrodes; a reference potential; and a filter unit. Each of the plurality of electric signal measurement units is connected to the reference potential. The filter unit is connected between at least one of the electrodes and at least one of the electric signal measurement units.

Description

[Technical field]

[0001] The present technology relates to an electrical signal measuring device and an electrical signal measuring system. [Background technology]

[0002] Conventionally, technologies for estimating the emotions of living organisms have been used. It is also known that measuring multiple types of electrical signals is effective for estimating the emotions of living organisms. For example, it is known that the emotions of living organisms can be estimated by measuring electroencephalogram (EEG) signals and electrodermal activity (EDA) signals. Therefore, there is a demand for a device that can measure multiple types of electrical signals.

[0003] For example, Patent Document 1 discloses an emotion recognition system including: "a biosignal acquisition device that is worn on a user's body to acquire at least one or more biosignals and wirelessly transmit the acquired biosignals; and an emotion recognition device that monitors the biosignals sent from the biosignal acquisition device for a short period of time to recognize the emotional state of the user."

[0004] For example, Patent Document 2 discloses a reference potential stabilization device for bioelectrical signal measurement, characterized in that it comprises a reference potential stabilization circuit that matches the reference potential of the human body with the reference potential of a differential amplifier based on the midpoint potential between the potentials of two electrodes that measure the potential of the human body and the reference potential of the differential amplifier, which uses the potentials of the electrodes as input signals, and a short-circuit that shorts the midpoint potential to the reference potential of the differential amplifier.

[0005] For example, Patent Document 3 discloses a "dermal electrodermal activity measuring device configured to reduce the influence of a polarization voltage generated between a measurement electrode and a measurement object, the device comprising: a DC power source for supplying a DC signal to the measurement object via the measurement electrode; a first electrode and a second electrode constituting the measurement electrode for detecting the electrodermal activity of the measurement object by the DC signal from the DC power source; and a polarity switching unit consisting of a plurality of switches connected to the DC power source, the first electrode, and the second electrode, and by switching the plurality of switches in the polarity switching unit, a first signal path in which a signal flows from the DC power source to the first electrode and the second electrode in that order, and a second signal path in which a signal flows from the DC power source to the second electrode and the first electrode in that order are configured, and a switching operation is performed to switch between the first signal path and the second signal path at a predetermined period." [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2004-000474 A [Patent Document 2] JP 2003-339656 A [Patent Document 3] JP 2014-023711 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, when multiple electrical signal measuring units share a single reference potential (GND) in order to measure multiple types of electrical signals using a single device, there is a problem that electrical interference occurs via the living body.

[0008] Therefore, a main object of the present technology is to provide an electrical signal measuring device and an electrical signal measuring system that measure electrical signals of multiple formats with high accuracy. [Means for solving the problem]

[0009] In other words, the present technology provides an electrical signal measuring device comprising at least a plurality of electrodes that apply electrical signals to a living organism and / or detect the electrical signals from the living organism, a plurality of electrical signal measuring units that measure the electrical signals detected by the electrodes, a reference potential, and a filter unit, each of the plurality of electrical signal measuring units being connected to the reference potential, and the filter unit being connected between at least one of the electrodes and at least one of the electrical signal measuring units. The filter section may be connected between at least one of the electrodes and at least two or more of the electrical signal measurement sections. The filter section may reduce a predetermined frequency band contained in the electrical signal. The filter section may reduce a DC component of the electrical signal. The filter section may include a resistor and / or a capacitor. The electrodes may include sensing electrodes, reference electrodes, or application electrodes. The filter section may be connected between at least one of the application electrodes and at least one of the electrical signal measurement sections. The filter section may be connected between at least one of the application electrodes and at least two or more of the electrical signal measurement sections. The filter section may be connected between at least one of the reference electrode or the detection electrode and at least one of the electrical signal measurement sections. The present technology also provides an electrical signal measurement system comprising at least an electrode for applying an electrical signal to a living body and / or detecting the electrical signal from the living body, a plurality of electrical signal measuring units for measuring the electrical signals detected by the electrodes, a reference potential, and a filter unit, each of the plurality of electrical signal measuring units being connected to the reference potential, and the filter unit being connected between at least one of the electrodes and at least one of the electrical signal measuring units. [Brief description of the drawings]

[0010] [Figure 1] 1 is a block diagram showing a configuration of an electrical signal measuring device according to an embodiment of the present technology. [Diagram 2] 1 is a circuit diagram showing a circuit configuration of an electrical signal measuring device according to an embodiment of the present technology. [Diagram 3] 1 is a circuit diagram showing a circuit configuration of an electrical signal measuring device according to an embodiment of the present technology. [Figure 4] 1 is a block diagram showing a configuration of an electrical signal measuring device according to an embodiment of the present technology. [Diagram 5] 1 is a circuit diagram showing a circuit configuration of an electrical signal measuring device according to an embodiment of the present technology. [Figure 6] 1 is a circuit diagram showing a circuit configuration of an electrical signal measuring device according to an embodiment of the present technology. [Figure 7] 1 is a block diagram showing a configuration of an electrical signal measuring system according to an embodiment of the present technology. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] A preferred embodiment for implementing the present technology will be described below. The embodiment described below shows an example of a typical embodiment of the present technology, and the scope of the present technology will not be narrowly interpreted by this. Unless otherwise specified, in the drawings, "upper" means the upper direction or upper side in the drawing, "lower" means the lower direction or lower side in the drawing, "left" means the left direction or left side in the drawing, and "right" means the right direction or right side in the drawing. In addition, in the drawings, the same or equivalent elements or members are given the same reference numerals, and duplicated explanations are omitted.

[0012] In the following description of the embodiments, expressions accompanied by "approximately", such as "approximately parallel" and "approximately perpendicular", may be used. For example, "approximately parallel" does not only mean completely parallel, but also means substantially parallel, that is, including a difference of, for example, about several percent. The same applies to other expressions accompanied by "approximately". Also, each figure is a schematic diagram and is not necessarily a precise illustration.

[0013] The present technology will be described in the following order. 1. First embodiment of the present technology (example 1 of electrical signal measuring device) (1) Overview of the Present Invention (2) Example 1 (3) Example 2 2. Second embodiment of the present technology (example 2 of electrical signal measuring device) (1) Overview of the Present Invention (2) Example 3 (3) Example 4 3. Third embodiment of the present technology (electrical signal measurement system)

[0014] [1. First embodiment of the present technology (example 1 of electrical signal measuring device)] [(1) Overview of this embodiment] An electrical signal measuring device according to an embodiment of the present technology will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of the electrical signal measuring device according to the present embodiment.

[0015] As shown in FIG. 1, the electrical signal measuring device 1000 of this embodiment at least includes a plurality of electrodes consisting of a first electrode 101, a second electrode 102, a third electrode 103, a fourth electrode 104 and a fifth electrode 105, a plurality of electrical signal measuring sections consisting of a first electrical signal measuring section 300 and a second electrical signal measuring section 400, a reference potential GND, and a filter section 201.

[0016] Each of the multiple electrodes 101-105 is disposed at a position in contact with the skin surface of the living body S or at a position close to the skin surface of the living body S. Each of the multiple electrodes 101-105 can apply an electric signal to the living body S and / or detect the electric signal from the living body S. The number of the multiple electrodes is not limited to five.

[0017] Each of the electrical signal measuring units 300, 400 is electrically connected to each of the electrodes 101 to 105. Each of the electrical signal measuring units 300, 400 transmits an electrical signal to, for example, the third electrode 103 and the fourth electrode 104. As a result, the third electrode 103 and the fourth electrode 104 apply the electrical signal to the living body S.

[0018] It has been known that common mode noise occurs due to the presence of an external electromagnetic field in measuring biological information, which causes a problem that biological information cannot be measured with high accuracy.

[0019] In order to reduce this common mode noise, the components corresponding to the common mode noise are inverted and amplified and fed back to the living body, thereby reducing the common mode noise. For this reason, the third electrode 103 and the fourth electrode 104 apply an electric signal to the living body S.

[0020] The first electrode 101, the second electrode 102, and the fifth electrode 105 detect an electrical signal from the living body S. Each of the multiple electrical signal measuring units 300, 400 measures the detected electrical signal. Examples of electrical signals measured by each of the multiple electrical signal measuring units 300, 400 include an electroencephalogram (EEG) signal, an electrocardiogram (ECG) signal, a magnetocardiogram (MCG) signal, a magnetoencephalogram (MEG) signal, a surface electromyogram (EMG) signal, an electrooculogram (EOG) signal, and an electrodermal activity (EDA) signal. Note that the number of multiple electrical signal measuring units is not limited to two.

[0021] The first electrical signal measuring section 300 has a first power supply 301. The second electrical signal measuring section 400 has a second power supply 401. The first power supply 301 and the second power supply 401 are connected to one reference potential GND. This allows one electrical signal measuring device 1000 to measure electrical signals of multiple formats. The electrical signals of multiple formats are measured with reference to this reference potential GND.

[0022] The filter unit 201 is connected between at least one of the electrodes and at least one of the electrical signal measuring units. In this embodiment, the filter unit 201 is connected between the third electrode 103 and the first electrical signal measuring unit 300. The filter unit 201 can reduce an electrical signal of a predetermined frequency band included in the electrical signal transmitted by the first electrical signal measuring unit 300.

[0023] The flow of processing performed by the electrical signal measuring device 1000 will be specifically described.

[0024] The first electrical signal measuring unit 300 transmits an electrical signal to the third electrode 103. The third electrode 103 applies an electrical signal (voltage) to the skin surface of the living body S. This causes the electrical signal to flow through the living body S into the first electrode 101 and the second electrode 102. The first electrode 101 and the second electrode 102 detect the electrical signal. The first electrical signal measuring unit 300 can obtain biological information by measuring the detected electrical signal.

[0025] The same is true for the second electrical signal measuring unit 400. The second electrical signal measuring unit 400 transmits an electrical signal to the fourth electrode 104. The fourth electrode 104 applies the electrical signal to the skin surface of the living body S. The fifth electrode 105 detects the electrical signal from the living body S. The second electrical signal measuring unit 400 can obtain biological information by measuring the detected electrical signal.

[0026] At this time, if the filter unit 201 is not provided, for example, the electrical signal applied to the living body S by the third electrode 103 may flow into the fifth electrode 105. This may cause the second electrical signal measuring unit 400 to be unable to obtain accurate biological information. In particular, in the measurement of electrodermal activity (EDA) signals, which require high accuracy, there is a problem that an error in the measurement result or range saturation occurs.

[0027] However, this problem can be solved by providing the filter unit 201. The filter unit 201 can reduce electrical signals of a predetermined frequency band included in the electrical signal transmitted by the first electrical signal measuring unit 300. This prevents, for example, the electrical signal applied to the living body S by the third electrode 103 from flowing into the fifth electrode 105. Therefore, the second electrical signal measuring unit 400 can measure the electrical signal with high accuracy.

[0028] The filter section 201 may include, for example, resistors, capacitors, coils, ferrite beads, diodes, etc. The resistors include variable resistors.

[0029] Moreover, the filter portion 201 may be made of any material that has passive characteristics, or may be made of a material having a resistance component, such as a pressure-sensitive resistive sheet.

[0030] In the present embodiment, an electrical signal from a living body is measured, but the measurement target is not limited to a living body. For example, a solid, liquid, or gas having any circuit characteristics may be measured.

[0031] (2) Example 1 The electrical signal measuring device will be specifically described below with reference to an example embodiment. Fig. 2 is a circuit diagram showing the circuit configuration of the electrical signal measuring device according to this embodiment.

[0032] As shown in FIG. 2, the electrical signal measuring device 1001 according to this embodiment at least includes a plurality of electrodes consisting of electrode 106, electrode 107, electrode 108, electrode 109 and electrode 110, a plurality of electrical signal measuring units consisting of electrical signal measuring unit 310 and electrical signal measuring unit 410, a reference potential GND, and a filter unit 204.

[0033] The electrodes 106 and 110 are, for example, detection electrodes that detect an electrical signal from the living body S. The electrode 107 is a reference electrode that serves as a reference for the potential of the electrical signal. The electrodes 108 and 109 are application electrodes that apply an electrical signal to the living body S. Note that the application electrodes are not limited to those based on a voltage source, and may also include those based on a current source.

[0034] The electrical signal measuring section 310 includes an instrumentation amplifier 311, an operational amplifier 312, and a power supply 313. The electrical signal measuring section 310 measures, for example, an electroencephalogram (EEG) signal.

[0035] A capacitor 202 is connected between the instrumentation amplifier 311 and the electrode 106. A capacitor 203 is connected between the instrumentation amplifier 311 and the electrode 107. The capacitors 202 and 203 can reduce electrical signals of a predetermined frequency band contained in the electrical signal.

[0036] The electrical signal measuring unit 410 includes an operational amplifier 411, an operational amplifier 412, an operational amplifier 413, a power supply 414, and a power supply 415. The electrical signal measuring unit 410 measures, for example, an electrodermal activity (EDA) signal.

[0037] The electrical signal measuring unit 310 is connected to an AD converter 501. The electrical signal measuring unit 410 is connected to an AD converter 502. The AD converter 501 converts an analog electrical signal measured by the electrical signal measuring unit 310 into a digital signal. The AD converter 502 converts an analog electrical signal measured by the electrical signal measuring unit 410 into a digital signal.

[0038] The power supply 313, the power supply 414, and the power supply 415 are connected to the reference potential GND. This allows, for example, electroencephalogram (EEG) signals and electrodermal activity (EDA) signals to be measured by a single electrical signal measuring device 1001. The electroencephalogram (EEG) signals and electrodermal activity (EDA) signals are measured with reference to this reference potential GND.

[0039] The filter unit 204 is connected between at least one of the application electrodes and at least one of the electrical signal measurement units. In this embodiment, the filter unit 204 is connected between the application electrode 108 and the electrical signal measurement unit 310.

[0040] The filter section 204 may be, for example, a capacitor. The capacitor 204 can reduce an electrical signal in a predetermined frequency band contained in the electrical signal transmitted by the electrical signal measuring section 310.

[0041] The electrical signal measuring unit 310 measures the potential that is the midpoint between the electrical signal detected by the detection electrode 106 and the electrical signal detected by the reference electrode 107. The electrical signal measuring unit 410 measures the potential of the electrical signal detected by the detection electrode 110.

[0042] The electrical signal applied to the living body S by the application electrode 108 is an electrical signal in which a DC (direct current) component generated in a circuit is superimposed on an AC (alternating current) component in the opposite phase of the common mode noise.

[0043] This DC component of the electrical signal adversely affects the measurement of the DC type electrodermal activity (EDA) signal by the electrical signal measuring unit 410. When detecting an electrical signal from the living body S, the detection electrode 110 may also detect the DC component of the electrical signal applied to the living body S by the application electrode 108. Therefore, this electrical signal becomes noise, and there is a risk that the electrical signal measuring unit 410 may not be able to accurately measure the electrodermal activity (EDA) signal.

[0044] Therefore, the capacitor 204, which is a filter unit, can reduce electrical signals of a predetermined frequency band contained in the electrical signal transmitted by the electrical signal measuring unit 310. Furthermore, the capacitor 204, which is a filter unit, can remove electrical signals of DC components (0 Hz components) contained in the electrical signal transmitted by the electrical signal measuring unit 310. This allows the detection electrode 110 to detect only electrical signals from the living body S. Therefore, the electrical signal measuring unit 410 can measure electrodermal activity (EDA) signals with high accuracy.

[0045] (3) Example 2 Another embodiment of the electrical signal measuring device will be described below. Fig. 3 is a circuit diagram showing the circuit configuration of the electrical signal measuring device according to this embodiment. Differences from Fig. 2 will be mainly described.

[0046] As shown in Figure 3, the electrical signal measuring device 1002 of this embodiment at least includes a plurality of electrodes consisting of electrode 111, electrode 112, electrode 113, electrode 114 and electrode 115, a plurality of electrical signal measuring units consisting of electrical signal measuring unit 320 and electrical signal measuring unit 330, a reference potential GND, and a plurality of filter units consisting of filter unit 207 and filter unit 210.

[0047] The electrodes 111 and 114 are, for example, detection electrodes that detect an electrical signal from the living body S. The electrodes 112 and 115 are reference electrodes that serve as a reference for the potential of the electrical signal. The electrodes 113 and 116 are application electrodes that apply an electrical signal to the living body S.

[0048] The electrical signal measurement unit 320 and the electrical signal measurement unit 330 have the same configuration in order to measure electrical signals of the same format. That is, the electrical signal measurement unit 320 has an instrumentation amplifier 321, an operational amplifier 322, and a power supply 323. The electrical signal measurement unit 330 has an instrumentation amplifier 331, an operational amplifier 332, and a power supply 333. Each of the electrical signal measurement unit 320 and the electrical signal measurement unit 330 can measure, for example, electroencephalogram (EEG) signals. When measuring electroencephalogram (EEG) signals, electrical signals of multiple channels are generally measured.

[0049] A capacitor 205 is connected between the instrumentation amplifier 321 and the electrode 111. A capacitor 206 is connected between the instrumentation amplifier 321 and the electrode 112.

[0050] A capacitor 208 is connected between the instrumentation amplifier 331 and the electrode 114. A capacitor 209 is connected between the instrumentation amplifier 331 and the electrode 115.

[0051] The electrical signal measuring section 320 is connected to the AD converter 503. The electrical signal measuring section 330 is connected to the AD converter 504.

[0052] The electrical signal measuring unit 320 measures the midpoint potential between the electrical signal detected by the electrode 111, which is the detection electrode, and the electrical signal detected by the electrode 112, which is the reference electrode. The electrical signal measuring unit 330 measures the midpoint potential between the electrical signal detected by the electrode 114, which is the detection electrode, and the electrical signal detected by the electrode 115, which is the reference electrode.

[0053] Each of the filter unit 207 and the filter unit 208 is connected between at least one of the application electrodes and at least one of the electrical signal measurement units. In this embodiment, the filter unit 207 is connected between the application electrode 113 and the electrical signal measurement unit 320. The filter unit 210 is connected between the application electrode 116 and the electrical signal measurement unit 330.

[0054] Each of the filter unit 207 and the filter unit 208 may be, for example, a resistor. By configuring the electrical signal measuring device 1002 in this way, the resistance ratio of the resistor 207 and the resistor 210 can be designed so as to enhance the effect of removing common mode noise. Each of the resistor 207 and the resistor 210 may be a variable resistor whose resistance value changes.

[0055] Furthermore, the electrical signal measuring device 1002 has such a configuration, and thus the Tepnan theorem can be applied. Therefore, by adjusting the resistance ratio of the resistor 207 and the resistor 210, it becomes easy to adjust the amount of the electrical signal applied by the application electrode 113 and the application electrode 116.

[0056] [2. Second embodiment of the present technology (example 2 of electrical signal measuring device)] [(1) Overview of this embodiment] An electrical signal measuring device according to an embodiment of the present technology will be described with reference to Fig. 4. Fig. 4 is a block diagram showing the configuration of the electrical signal measuring device according to the present embodiment. Differences from the first embodiment will be mainly described.

[0057] As shown in FIG. 4, the electrical signal measuring device 2000 of this embodiment at least includes a plurality of electrodes consisting of a first electrode 117, a second electrode 118, a third electrode 119, and a fourth electrode 120, a plurality of electrical signal measuring sections consisting of a first electrical signal measuring section 600 and a second electrical signal measuring section 700, a reference potential GND, and a filter section 211.

[0058] When one electrical signal measuring device measures electrical signals of multiple types, there is a problem that spatial constraints arise for the arrangement of multiple electrodes. For example, to measure electroencephalogram (EEG) signals, at least three electrodes (a detection electrode, a reference electrode, and an application electrode) are required. Also, to measure electrodermal activity (EDA) signals, at least two electrodes (a detection electrode and an application electrode) are required. Therefore, when one electrical signal measuring device measures electroencephalogram (EEG) signals and electrodermal activity (EDA) signals, at least five electrodes are required.

[0059] There is a demand for miniaturization of electrical signal measuring devices so that they can be used in daily life. However, there is a problem in that the more electrodes an electrical signal measuring device has, the smaller the area in which the electrodes can be arranged, making it difficult to miniaturize the electrical signal measuring device.

[0060] In addition, when multiple electrodes are placed on the skin surface of a living body to measure multiple types of electrical signals, there may be an optimal electrode placement position for each measurement type. For example, there may be an optimal electrode placement position on the skin surface of a living body for measuring electroencephalogram (EEG) signals, and an optimal electrode placement position on the skin surface of a living body for measuring electrodermal activity (EDA) signals.

[0061] However, there may be cases where the optimal position for measuring electroencephalogram (EEG) signals is the same as the optimal position for measuring electrodermal activity (EDA) signals. In this case, the electrodes for detecting one of the electrical signals will be placed in a suboptimal position. Since the skin surface of a living body is unique, it is rare for there to be more than one optimal position.

[0062] One possible solution to this problem is to have multiple electrical signal measuring units share one electrode and use a switch circuit to switch between the electrical signals they detect. However, because the electrical signals they detect are analog signals, there is a problem that electrical noise is generated when the switch circuit switches between them.

[0063] In one embodiment of the present technology, the third electrode 119 is shared by the first electrical signal measurement section 600 and the second electrical signal measurement section 700. The third electrode 119 is connected to the first electrical signal measurement section 600 and at the same time to the second electrical signal measurement section 700. Furthermore, a filter section 211 is connected between the third electrode 119 and the first electrical signal measurement section 600. That is, the filter section 211 is connected between at least one of the electrodes and at least two or more of the electrical signal measurement sections.

[0064] The filter unit 211 can reduce electrical signals of a predetermined frequency band included in the electrical signal transmitted by the first electrical signal measuring unit 600. This prevents, for example, the electrical signal applied to the living body S by the third electrode 119 from flowing into the fourth electrode 120. Therefore, the second electrical signal measuring unit 700 can measure the electrical signal with high accuracy.

[0065] In addition, the third electrode 119 is shared by the first electrical signal measuring section 600 and the second electrical signal measuring section 700, thereby reducing the number of electrodes. This contributes to the miniaturization of the electrical signal measuring device. Furthermore, each of the multiple electrodes can be placed at an optimal position on the skin surface of the living body.

[0066] (2) Example 3 Hereinafter, the electrical signal measuring device will be specifically described with reference to an example. Fig. 5 is a circuit diagram showing the circuit configuration of the electrical signal measuring device according to this embodiment. Differences from Fig. 2 will be mainly described.

[0067] The electrodes 121 and 124 are, for example, detection electrodes that detect an electrical signal from the living body S. The electrode 122 is a reference electrode that serves as a reference for the potential of the electrical signal. The electrode 123 is an application electrode that applies the electrical signal to the living body S.

[0068] The electrode 123 is shared by the electric signal measuring unit 610 and the electric signal measuring unit 710. The electrode 123 is connected to the electric signal measuring unit 610 and at the same time to the electric signal measuring unit 710. Furthermore, a filter unit 214 is connected between the electrode 119 and the electric signal measuring unit 610. In other words, the filter unit 214 is connected between at least one of the application electrodes and at least two or more of the electric signal measuring units.

[0069] The filter section 214 may be, for example, a capacitor. The capacitor 214 can reduce an electrical signal in a predetermined frequency band contained in the electrical signal transmitted by the electrical signal measuring section 610.

[0070] With the electrical signal measuring device 2001 having such a configuration, for example, the electrical signal applied to the living body S by the electrical signal measuring unit 710 via the electrode 123 is reduced from flowing into the electrode 121 or the electrode 122. Therefore, the electrical signal measuring unit 610 can measure the electrical signal with high accuracy.

[0071] Furthermore, the number of electrodes is reduced by sharing the electrode 123 between the electric signal measuring unit 610 and the electric signal measuring unit 710, which contributes to the miniaturization of the electric signal measuring device 2001. Furthermore, each of the multiple electrodes can be placed at an optimal position on the skin surface of the living body.

[0072] (3) Example 4 Another embodiment of the electrical signal measuring device will be described below. Fig. 6 is a circuit diagram showing the circuit configuration of the electrical signal measuring device according to this embodiment. Differences from Fig. 5 will be mainly described.

[0073] The electrode 125 is, for example, a detection electrode that detects an electrical signal from the living body S. The electrode 126 is both a reference electrode that serves as a reference for the potential of the electrical signal and a detection electrode. The electrode 127 is an application electrode that applies an electrical signal to the living body S.

[0074] The electrode 127 is shared by the electric signal measuring section 620 and the electric signal measuring section 720. The electrode 127 is connected to the electric signal measuring section 620 and at the same time, is connected to the electric signal measuring section 720. Furthermore, the filter section 217 is connected between the electrode 127 and the electric signal measuring section 620.

[0075] Furthermore, the electrode 126 is shared by the electrical signal measuring unit 620 and the electrical signal measuring unit 720. The electrode 126 is connected to the electrical signal measuring unit 620 and at the same time to the electrical signal measuring unit 720. Furthermore, the filter unit 218 is connected between the electrode 126 and the electrical signal measuring unit 720. In other words, the filter unit 218 is connected between at least one of the reference electrodes and at least two or more of the electrical signal measuring units.

[0076] The filter section 217 may be, for example, a capacitor. The filter section 217 can reduce an electrical signal in a predetermined frequency band contained in the electrical signal transmitted by the electrical signal measuring section 620.

[0077] The filter unit 218 has, for example, a resistor and a capacitor, and can function as, for example, a low-pass filter. The resistor and the capacitor may be connected in series or in parallel. Alternatively, the resistor and the capacitor may be connected in a configuration such as a delta type or a star type. The filter unit 218 can reduce an electrical signal of a predetermined frequency band included in the electrical signal transmitted by the electrical signal measuring unit 620.

[0078] The filter unit 218 can reduce electrical signals of a predetermined frequency band contained in the electrical signals detected by the electrodes 126. This can prevent the electroencephalogram (EEG) signals detected by the electrodes 126 and related to the electrical signal measurement unit 620 from flowing into the electrical signal measurement unit 720.

[0079] With this configuration, the electrical signal measuring device 2002 can simultaneously measure electroencephalogram (EEG) signals and electrodermal activity (EDA) signals, while using the same number of electrodes as an electrical signal measuring device that measures only electroencephalogram (EEG) signals.

[0080] The electrical signal measuring section 620 and the electrical signal measuring section 720 may share the electrode 125. In this case, the filter section 218 is connected between at least one of the detection electrodes and at least two or more of the electrical signal measuring sections.

[0081] [3. Third embodiment of the present technology (electrical signal measurement system)] An electrical signal measuring device according to an embodiment of the present technology will be described with reference to Fig. 7. Fig. 7 is a block diagram showing the configuration of an electrical signal measuring system according to the present embodiment.

[0082] As shown in FIG. 7, the electrical signal measurement system 3000 according to this embodiment at least includes a plurality of electrodes consisting of a first electrode 128, a second electrode 129, a third electrode 130, a fourth electrode 131 and a fifth electrode 132, a plurality of electrical signal measurement sections consisting of a first electrical signal measurement section 800 and a second electrical signal measurement section 900, a reference potential GND and a filter section 219.

[0083] Each of the multiple electrodes 128-132 is disposed at a position in contact with the skin surface of the living body S or at a position close to the skin surface of the living body S. Each of the multiple electrodes 128-132 can apply an electric signal to the living body S and / or detect the electric signal from the living body S. The number of the multiple electrodes is not limited to five.

[0084] Each of the multiple electrical signal measuring units 800, 900 is electrically connected to each of the multiple electrodes 128 to 132. Each of the multiple electrical signal measuring units 800, 900 transmits an electrical signal to, for example, the third electrode 130 and the fourth electrode 131. As a result, the third electrode 130 and the fourth electrode 131 apply the electrical signal to the living body S.

[0085] The first electrode 128, the second electrode 129, and the fifth electrode 132 detect an electrical signal from the living body S. Each of the multiple electrical signal measuring units 800, 900 measures the detected electrical signal. Examples of electrical signals measured by each of the multiple electrical signal measuring units 800, 900 include an electroencephalogram (EEG) signal, an electrocardiogram (ECG) signal, a magnetocardiogram (MCG) signal, a magnetoencephalogram (MEG) signal, a surface electromyogram (EMG) signal, an electrooculogram (EOG) signal, and an electrodermal activity (EDA) signal. Note that the number of multiple electrical signal measuring units is not limited to two.

[0086] The first electrical signal measuring section 800 has a first power supply 801. The second electrical signal measuring section 900 has a second power supply 901. The first power supply 801 and the second power supply 901 are connected to one reference potential GND. This allows one electrical signal measuring system 3000 to measure electrical signals of multiple formats. The electrical signals of multiple formats are measured with reference to this reference potential GND.

[0087] The filter unit 219 is connected between at least one of the electrodes and at least one of the electrical signal measuring units. In this embodiment, the filter unit 219 is connected between the third electrode 130 and the first electrical signal measuring unit 800. The filter unit 219 can reduce electrical signals of a predetermined frequency band included in the electrical signal transmitted by the first electrical signal measuring unit 800.

[0088] This electrical signal measuring system 3000 can utilize the techniques described in the first and second embodiments, and therefore will not be described again.

[0089] In addition, the configurations described in the above embodiments can be selected or changed to other configurations as appropriate without departing from the spirit of the present technology.

[0090] The effects described in this specification are merely examples and are not limiting, and other effects may also be obtained.

[0091] The present technology can also be configured as follows. [1] A plurality of electrodes for applying an electrical signal to a living body and / or detecting the electrical signal from the living body; a plurality of electrical signal measuring units that measure the electrical signals detected by the electrodes; A reference potential; The filter unit includes at least Each of the plurality of electrical signal measuring units is connected to the reference potential, An electrical signal measuring device, wherein the filter section is connected between at least one of the electrodes and at least one of the electrical signal measuring sections. [2] The filter unit is connected between at least one of the electrodes and at least two or more of the electrical signal measurement units. The electrical signal measuring device described in [1]. [3] The filter unit reduces the electrical signal of a predetermined frequency band included in the electrical signal. An electrical signal measuring device according to [1] or [2]. [4] The filter unit reduces a DC component of the electrical signal. The electrical signal measuring device according to any one of [1] to [3]. [5] The filter unit includes a resistor and / or a capacitor. The electrical signal measuring device according to any one of [1] to [4]. [6] The electrodes include a sensing electrode, a reference electrode, or an application electrode. [5] An electrical signal measuring device according to the present invention. [7] The filter unit is connected between at least one of the application electrodes and at least one of the electrical signal measurement units. [6] An electrical signal measuring device according to the present invention. [8] The filter unit is connected between at least one of the application electrodes and at least two or more of the electrical signal measurement units. An electrical signal measuring device according to [6] or [7]. [9] The filter unit is connected between at least one of the reference electrode or the detection electrode and at least one of the electrical signal measurement units. The electrical signal measuring device according to any one of [6] to [8].

[10] An electrode for applying an electrical signal to a living body and / or detecting the electrical signal from the living body; a plurality of electrical signal measuring units that measure the electrical signals detected by the electrodes; A reference potential; The filter unit includes at least Each of the plurality of electrical signal measuring units is connected to the reference potential, An electrical signal measurement system, wherein the filter unit is connected between at least one of the electrodes and at least one of the electrical signal measurement units. [Explanation of symbols]

[0092] S: Living body 101~132: Electrode 300, 310, 320, 330, 410, 600, 610, 620, 700, 710, 720, 800, 900: Electrical signal measurement section GND: Reference potential 201, 204, 207, 210, 211, 214, 217, 218, 219: Filter section 1000, 1001, 1002, 2000, 2001, 2002: Electrical signal measuring device 3000: Electrical signal measurement system

Claims

1. A plurality of electrodes including an electrode for applying an electrical signal to a living body and an electrode for detecting the electrical signal from the living body; A plurality of electrical signal measuring units that measure electrical signals applied from an electrode that applies an electrical signal to the living body among the plurality of electrodes and detected by the detection electrode; A reference potential; The filter unit includes at least Each of the plurality of electrical signal measuring units is connected to the reference potential, An electrode that applies an electrical signal to the living body applies the electrical signal having a DC component superimposed thereon to the living body; An electrical signal measuring device, wherein the filter unit is connected between the electrode that applies an electrical signal on which the DC component is superimposed to the living body and at least one of the electrical signal measuring units, and reduces the electrical signal of the DC component contained in the electrical signal.

2. The filter unit is connected between at least one of the electrodes and at least two or more of the electrical signal measurement units. The electrical signal measuring device according to claim 1 .

3. The filter unit reduces the electrical signal of a predetermined frequency band included in the electrical signal. The electrical signal measuring device according to claim 1 .

4. The filter unit includes a resistor and / or a capacitor. The electrical signal measuring device according to claim 1 .

5. The electrodes include a sensing electrode, a reference electrode, or an application electrode. The electrical signal measuring device according to claim 1 .

6. The filter unit is connected between at least one of the application electrodes and at least one of the electrical signal measurement units. The electrical signal measuring device according to claim 5 .

7. The filter unit is connected between at least one of the application electrodes and at least two or more of the electrical signal measurement units. The electrical signal measuring device according to claim 5 .

8. The filter unit is connected between at least one of the reference electrode or the detection electrode and at least one of the electrical signal measurement units. The electrical signal measuring device according to claim 5 .

9. A plurality of electrodes including an electrode for applying an electrical signal to a living body and an electrode for detecting the electrical signal from the living body; A plurality of electrical signal measuring units that measure electrical signals applied from an electrode that applies an electrical signal to the living body among the plurality of electrodes and detected by the detection electrode; A reference potential; The filter unit includes at least Each of the plurality of electrical signal measuring units is connected to the reference potential, An electrode that applies an electrical signal to the living body applies the electrical signal having a DC component superimposed thereon to the living body; An electrical signal measurement system, wherein the filter unit is connected between the electrode that applies an electrical signal on which the DC component is superimposed to the living body and at least one of the electrical signal measurement units, and reduces the electrical signal of the DC component contained in the electrical signal.

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