KR102102421B1 - EEG measuring earphone detecting sleepiness while driving and the system using it - Google Patents

Abstract

The present invention relates to an earphone having an EEG measuring means and a system using the same, the reference electrode having a constant surface area, and is installed spaced apart from the reference electrode, and a measurement electrode for detecting and measuring the EEG, separated from the measurement electrode and the reference electrode It consists of a ground electrode attached to the skin surface, a reference electrode, a pressure electrode and a pressure housing for pressing the ground electrode to the skin, and a wired or wireless communication module for transmitting the EEG signal measured by the measurement electrode, the measurement electrode And the reference electrode and the ground electrode are made of an elastic resin material, so that even when attached to a skin having an extremely non-uniform surface such as bending and hair under a small pressure, it is possible to obtain a large amount of EEG signal information, and even if repeatedly used Since there is no need to replace it frequently, it is inconvenient to install various systems that measure and use EEG. The use without feeling pain or wear earphones and to provide a simple and using the same system. Through this, in the long-distance driving situation in which drowsy driving monitoring is desperately needed, drowsy driving detection, which could not be practically realized due to uncomfortable fit or pain in wear, can be properly realized due to overcoming technical obstacles, resulting in a large accident due to drowsy driving. It is intended to provide an EEG measuring earphone and a system using the same.

Description

EEG measuring earphone detecting sleepiness while driving and the system using it

The present invention relates to an earphone for measuring EEG and a drowsy driving detection system using the same, and more particularly, to an earphone having a high-resolution EEG measuring means capable of detecting drowsiness during driving and a system using the same.

Recently, among the causes of automobile accidents, the accident with the highest death rate has been investigated as drowsy driving due to driver fatigue. In particular, among the proportion of traffic accidents occurring on highways, drowsy driving accidents account for a high proportion of 30% or more, so the development of smart vehicle safety technology is urgently needed to prevent drowsy driving.

BACKGROUND With the development of automotive electronics technology and increasing demands for intelligent automobile technology, vehicle safety system technologies such as driving stability improvement technology, accident prevention and avoidance technology, and autonomous driving technology have been developed.

Particularly, as a technique for preventing drowsy driving, research on recognizing the driver's drowsiness through a frequency of sudden steering wheel manipulation or image analysis or EEG measurement has been actively conducted.

The drowsiness driving prevention system of the image analysis method is a system for detecting whether the person is drowsiness by detecting muscle movements of each part of the face, including the eyelids, as shown in the photo of FIG. .

However, the image analysis method system may cause an accident by controlling the vehicle due to false drowsiness recognition because the uncertainty of image recognition is large due to a difference in the shape of the driver's eyes and a complicated lighting environment in the vehicle.

On the other hand, in the case of the EEG measurement method of inserting into the ear canal inside the face or ear as shown in FIG. 2, the electrode used is a wet electrode in the form of a patch with an adhesive applied to minimize impedance between the skin and the electrode, or physically It is an expensive dry electrode that is gold-plated on a support to which force can be applied. In the case of a wet electrode, there is a problem that can be used only once due to the problem of drying and abrasion, and the dry electrode has electricity to obtain high resolution EEG information. Since the skin has to be pressed under excessive pressure to reduce resistance, pain is caused to be worn while driving for a long time, and thus there is a problem that it is difficult to continuously wear in a driving process of a certain time or more.

Therefore, even if it is attached to the skin having an extremely non-uniform surface such as bending and hair with a small pressure, it is possible to obtain a large-sized EEG signal information, and even if it is repeatedly used, it is equipped with an electrode that does not need to be replaced frequently. Development of a drowsy driving detection device capable of preventing a large accident is urgently required.

Publication Patent Publication No. 10-2012-0031506 (Publication date: 2012.04.03.)

Accordingly, the present invention is to improve the problems of the prior art, it is possible to obtain large-sized EEG signal information even when attached to a skin having an extremely non-uniform surface such as curvature and hair under a small pressure, and frequently used repeatedly. It is intended to provide an EEG measuring earphone and a drowsiness driving detection system that are equipped with an electrode that does not need to be replaced to prevent a large accident due to a drowsy driving.

The EEG measuring earphone according to the present invention for achieving this purpose is a reference electrode attached to the surface of the human skin, attached to the skin spaced apart from the reference electrode, a measuring electrode for detecting and measuring EEG, a measuring electrode and a reference electrode It consists of a ground electrode that is separated and attached to the skin surface, a reference electrode, a pressure electrode and a pressure housing that presses the ground electrode against the skin, and a wired or wireless communication module that transmits the EEG signal measured at the measurement electrode, and the measurement The electrode is made of a flexible conductive material.

Here, the measuring electrode is preferably formed by adding a curing agent and a conductive metal powder to liquid silicone.

In this case, the metal powder is preferably formed of a dendrite structure.

And the pressure housing is preferably formed in the form of an in-ear earphone, and is provided on each side of the ear, and the measurement electrode and the reference electrode are formed in the same shape as the silicon tip of the in-ear earphone and are respectively coupled to the pressure housing to measure. The electrode and the reference electrode are inserted into different ears.

At this time, the reference electrode and the ground electrode preferably form part of one silicon tip, respectively, and an insulating band is formed between the reference electrode and the ground electrode, and the reference housing and the reference electrode connection surface that are in close contact with the inner surface of the reference electrode in the pressing housing. The ground electrode connection surface, which is in close contact with the inner surface of the ground electrode, is separated from each other in a circular band shape and protrudes.

Alternatively, the pressurized housing is preferably made of a hanger hanging on the auricle, and a pressurized housing in the form of an in-ear earphone connected to the hanger with a cable, and the measuring electrode is installed on the contacting head of both sides of the hanger to contact the skin. In contact, the ground electrode and the reference electrode are coupled to the pressure housing, and the ground electrode and the reference electrode each form a part of one silicon tip shape, an insulating band is formed between the reference electrode and the ground electrode, and the pressure housing is a reference The reference electrode connection surface in close contact with the inner surface of the electrode and the ground electrode connection surface in close contact with the inner surface of the ground electrode are separated from each other in a circular band shape to protrude.

On the other hand, the drowsy driving detection system according to the present invention is a drowsy driving monitoring system using an EEG measuring earphone made of any one of claims 1 to 9, and analyzes EEG signals received from the headset and the communication unit It is composed of a terminal that identifies whether or not it is drowsy, and the terminal is driven by an Android or iPhone operating system, and is characterized by displaying the current EEG state on a screen identifiably with an EEG signal analysis app.

In this case, the communication module provided in the headset has a built-in amplification module that receives and amplifies a voice signal from a terminal via Bluetooth, and the in-ear housing or the in-ear housing when the pressurizing housing itself is formed in the form of in-ear earphones. When the ear-shaped pressurized housing is provided, a vibrating plate for reproducing the amplified voice signal at an audible frequency is built in the pressurized housing, and when it is determined that the brainwaves received by the terminal are in a drowsy driving state, the terminal The amplification module that transmits the voice warning signal and receives the voice warning signal amplifies the voice warning signal to reproduce the voice warning through the diaphragm.

The EEG measuring earphone according to the present invention and the sensing system using the same can be obtained by using a conductive flexible electrode, so that even when attached to a skin having an extremely non-uniform surface such as bends and hair with a small pressure, it is possible to acquire EEG signal information of a large size, Since it does not need to be replaced frequently even after repeated use, in long-distance driving situations where drowsy driving monitoring is desperately needed, drowsy driving detection that could not be practically realized due to uncomfortable fit or pain in wear can only be properly achieved due to overcoming technical obstacles. Since there is, there is an effect that can prevent a large accident due to drowsy driving.

1 is a photograph showing a drowsy driving detection system for image analysis, which is a prior art,
2a to 2c are views showing a conventional EEG measuring system,
3 to 5 are perspective views of a first embodiment of an EEG measuring earphone according to the present invention,
6 is a perspective view of a second embodiment of the EEG measuring earphone according to the present invention,
7 and 8 are photographs of a first embodiment of an EEG measuring earphone according to the present invention,
9 is a conceptual diagram of a drowsiness driving monitoring system according to the present invention,
10 is a view showing a state according to the shape of the EEG wavelength,
11 is a graph showing the types of EEG wavelengths,
12 is an equation and graph showing the brain wave analysis algorithm,
13 and 14 are pictures showing the Android app screen in the drowsy driving detection system according to the present invention,

The specific structure or functional descriptions presented in the embodiments of the present invention are exemplified for the purpose of describing the embodiments according to the concept of the present invention, and the embodiments according to the concept of the present invention may be implemented in various forms. In addition, it should not be construed as being limited to the embodiments described herein, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

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

The headset according to the present invention is connected to a measurement electrode inserted into the ear canal, a cable connected to the measurement electrode, and receives a brainwave signal received from the measurement electrode to amplify the signal and amplify the brainwave signal amplified from the differential amplification module. A low-pass filter and a notch filter that removes noise other than the bio-signal received, an AD converter that converts the EEG signal received from the low-pass filter and the notch filter into a digital signal, and a digital signal converted into the AD converter, wired or wirelessly It consists of a communication module to transmit.

Here, when the measurement electrode is made of an elastic material and inserted into the ear canal, the surface of the measurement electrode is in close contact with the inner surface of the ear canal.

And the measurement electrodes are isoprene rubber, silicone rubber, urethane rubber, butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, ethylene propylene rubber, butyl rubber, chlorosulfonated polyethylene rubber, acrylic rubber, polysulfide rubber, It is formed by adding a conductive powder containing at least one of silver, copper, gold, platinum, carbon, carbon nanotubes, graphene, and aluminum to an elastic material containing at least one of fluorine rubber and epichlorohydrin rubber. It may be made of a conductive elastic material.

Alternatively, the measuring electrode may be formed by adding a curing agent and a conductive metal powder to liquid silicone.

In this case, each of the particles constituting the conductive metal powder is preferably formed inside of a dendrite structure.

The measurement electrode formed in this way is called a conductive flexible electrode, and the conductive flexible electrode has the following differences compared to a conventional wet electrode and a metal electrode.

1. Unlike the conventional wet electrode, there is no gel-like adhesive component and there is no metallic touch like the conventional metal electrode, so it does not give the user unpleasant feeling due to wearing.

2. Even if the shape of the ear canal varies from person to person, it is a flexible elastic material, so all types of ear canal can be closely adhered to the inner surface and have a good fit.

3. It can be stably adhered to the ear to minimize the occurrence of motor noise due to physical activity and to minimize the impedance between the skin and the electrode due to increased adhesion.

In addition, a reference electrode and a ground electrode may be installed on the measurement electrode as described below. Here, the direct measurement of EEG is the measurement electrode, the standard electrode is also referred to as the reference electrode, and when measuring the electromotive force or electrode potential of a chemical cell, the unipolar potential used is constant and becomes the reference. It refers to an electrode.

These electrodes should be in close contact with different parts of the skin. However, the EEG measurement for drowsy driving detection is not as drowsy if the judgment is wrong, but it is recognized as drowsy driving, so the driver can receive a warning signal, so there is a possibility of causing an accident. In order to obtain a value, the resistance between the skin and the electrode should be minimized.

In the conventional wet electrode, since the electrolyte is present between the skin and the electrode, conduction through the electrolyte is smooth, and the resistance between the skin and the electrode is very low. Therefore, the wet electrode is advantageous in terms of the magnitude of the signal through the low resistance.

However, since the wet electrode is attached to the skin in the form of a gel-type adhesive pad, it is inconvenient to wear, and since the gel-type pad dries easily, the sensitivity of measurement decreases with time. Can only be kept for a short time. Therefore, it can be used for short-term medical examination purposes, but it cannot be used for long-term driving due to the reduced wearing comfort and sensitivity.

Unlike the wet electrode, the dry electrode can be used repeatedly, but the conventional dry electrode has a lot of wrinkles and other curvatures when it comes into contact with the skin, is non-uniform due to sweat glands, and has a large resistance due to the nature of the skin, which is forced to generate space due to hair or body hair. As a result, it is difficult to obtain a large signal.

In order to alleviate this problem even a little, the prior art opens the bone inside the ear canal so as to be tightly attached to the ear canal as shown in FIG. The method of minimizing the resistance between the skin and the electrode is adopted by pressing.

However, unlike regular in-ear earphones, the shape of the hearing aid that fills the inside of the ear is very difficult to wear for a long time due to a strong foreign body feeling, and it is likely to cause other accidents because it is almost blocked from ambient sounds.

Therefore, the EEG measuring earphone according to the present invention can be in close contact with the measurement electrode used and the reference electrode and the ground electrode without any great pressure on the skin, and fills the space on the skin surface even when there are obstacles such as bending, hair, and body hair. In addition, it is proposed to be made of a conductive flexible electrode made of an elastic material so that it can contact the skin and minimize resistance between the skin like a wet electrode and obtain a large and high-resolution measurement signal.

The flexible electrode proposed in the present invention (1) first has a structure capable of minimizing the resistance between the skin and the surface of the internal microstructure, and (2) secondly, it fills the curvature of the skin surface even in the surface fine shape. It has a flexible elastic material that can be in close contact with the skin under a small pressure.

(1) In terms of microstructure , the flexible ciliated electrode proposed in the present invention is prepared by adding a curing agent and a conductive metal powder to a liquid resin, and in particular, in the present invention, the structure of nanostructures of the metal powder is a flake structure or a spherical structure. A dendrite structure is applied.

Since the spherical structure is a collection of spherical particles, due to the nature of the spherical form, the contact area between the spherical particles is too small, so many of the fine current flow paths are easily broken, and thus the electrical conductivity is inevitably low.

The flake structure has the shape of a thin and broad debris, and since the gap is more filled than the spherical structure, the contact area per unit volume is larger than that of the spherical structure, and the electric current is better because it has more current paths.

However, since the dendrite structure applied in the present invention is formed like a tree branch spreading from the center of the leaf toward the rim, a contact path is formed for each branched branch, so that a lot of contact points are formed, and current can flow. The path is also explosively increased, so the conductivity is very good.

The difference in conductivity is illustrated in FIG. 3 graphically according to the content of the metal particles of the spherical structure and the dendritic structure. That is, in FIG. 3, each of the flexible ciliated electrodes manufactured by adding a metal particle powder having a spherical structure to a liquid resin and the flexible ciliated electrodes produced by adding metal particle powder having a dendrite structure to a liquid resin The degree of reduction in electrical resistance according to the amount of metal powder added is shown. As can be seen in Figure 3, the metal powder having a dendrite (dendrite) structure has an extremely low resistance reduction effect.

(2) On the other hand, in terms of flexible elastic material , the flexible electrode in the present invention is produced by mixing fine metal particles with a rubber material.

The flexible ciliated electrode produced in this way is in contact with the skin in a form that fills all the spaces even if a bend due to wrinkles or a bend due to sweat glands or a space caused by hair or body hair is formed, so that the electrode is compared to a flat electrode without cilia formed. The difference between the skin and the skin is markedly different.

Therefore, when the EEG is measured using the flexible electrode according to the present invention, a significantly larger signal is obtained compared to the conventional electrode, so that much more accurate determination of drowsiness is possible.

On the other hand, it is possible to determine the state of drowsy driving by measuring the EEG by analyzing the results of the behavior of the EEG through algorithm analysis.

When analyzing frequencies that seem irregular at first glance with changes in time, such as brain waves, the frequency, magnitude, and phase of a specific value are determined according to a given signal. That is, since the frequency, magnitude, and phase of N waves are respectively determined according to the shape of the signal, analyzing the magnitude and phase of the frequency component of the signal in the frequency domain is the same as determining the shape of the signal in the time domain. This is because the frequency component of a signal is synonymous with human DNA in a signal, as if each person of a different appearance can be made by copying each person as long as they know exactly the DNA of the people. It can be analyzed accurately.

Therefore, in this signal semantic analysis, frequency component identification is derived by algorithm analysis. The process of deriving such an EEG algorithm is represented by equations and graphs in FIG. 14.

For reference, in the graph of FIG. 13, the α-wave mainly appears in a relaxed state such as tension relaxation, and in a stable and comfortable state, the amplitude increases, and generally appears continuously in the form of a regular wave. β-waves appear in all conscious activities, such as when you are awake or speaking, and are especially prevalent when you are anxious or nervous, or when you are dealing with complex calculations. And θ wave appears mainly in the process leading to emotional stability or sleep. Therefore, the process of transition from beta to theta is an important target.

In the present invention, the measurement electrode, the reference electrode, and the ground electrode are made of flexible ciliated electrodes to obtain a large signal with high resolution so that the process of transitioning from the waking state to the drowsiness state is initially captured, and the electrical resistance of the contact surface is minimized. Also, it can be worn without a pain or foreign body even when worn for a long time, so it is composed of a headset in the form of glasses or earphones that are usually worn on the head so that practical drowsy driving can be realized even during long distance driving.

In addition, as the distance between the reference electrode and the measurement electrode increases, the size of the measured signal increases. In the present invention, the measurement electrode and the reference electrode are easy to measure, but the maximum distance is maintained from each other so that accurate sleepiness can be measured by obtaining as much information as possible. It shows the effective placement that can be.

Hereinafter, the EEG measuring earphone according to the present invention will be described in the form of three embodiments. However, the following examples are exemplary, and the following three exemplary embodiments are not combined, or an exemplary embodiment very similar to the following three exemplary embodiments is not excluded from the present invention.

<First Example>

The first embodiment is formed in the form of an in-ear earphone, as shown in FIGS. 3 to 5, and the measuring electrode, the ground electrode, and the reference electrode directly contacting the inner surface of the ear canal are made of conductive flexible electrodes. Does not cause ear pain.

In the first embodiment, as a form worn on both ears, the measurement electrodes may be formed on each side so that they can be inserted into both ear canals, or a measurement electrode is installed on one side and the other side. A ground electrode and a reference electrode may be installed.

When both measurement electrodes are installed on both sides, they are formed identically on both sides in the form shown in FIG. 4, and measurement electrodes and reference electrodes are integrally formed on one side, and measurement electrodes and ground electrodes are integrally formed on the other side. It is formed of.

In addition, when the measurement electrode is formed on only one side and the reference electrode and the ground electrode are integrally formed on the other side, as shown in FIG. 5, the insulating band 123 includes the reference electrode 122 and the ground electrode 121. The conductive flexible electrode formed only on one side to insulate from each other and on which the measuring electrode 11 is formed is entirely composed of the measuring electrode 11. In this case, the reference electrode 122 and the measurement electrode 11 are installed in each of the separate units worn on both ears so that the distance between the reference electrode 122 and the measurement positive electrode 11 can be maximized to obtain the maximum signal possible. You can.

As shown in FIG. 3, the measurement electrode 11 is a member corresponding to a silicon tip that is inserted into the ear canal in the form of an in-ear earphone or a kernel-type earphone and is in direct contact with the skin of the inner ear canal. However, the general silicon tip acts only to gently settle inside the ear canal, but in the present invention, it acts as a measuring electrode 11 that receives a fine EEG signal at the level of nanoamperes.

In this case, the measurement electrode 11 is a conductive flexible ciliated electrode made of a flexible material that is elastic, like the silicon tip of a regular earphone, so it does not give any pain or foreign body sensation even when worn for a long time like a regular earphone.

And here, it corresponds to a housing in which a diaphragm that transforms an audio signal into sound waves in an audible frequency band is built-in, in which the measuring electrode 11 is brought into contact with the skin on the inner surface of the ear canal at the same time and at the measuring electrode 11 In order to transmit the measured signal to the terminal or the server, it functions to transmit to the wired or wireless communication module 36 provided as in FIG. 5.

However, as shown in Figure 4, the reference electrode 122 and the ground electrode 121 are inserted into the ear canal in the in-ear earphone to be provided in one member corresponding to a silicon tip that directly contacts the skin of the inner ear canal, The reference electrode 122 and the ground electrode 121 need to be electrically insulated to enable their respective operations.

Accordingly, the reference electrode 122 and the ground electrode 121 form one tip, but an insulating band 123 is formed between the reference electrode 122 and the ground electrode 121 to insulate the two.

In this case, the reference electrode 122 and the ground electrode 121 are inserted into the outer circumferential surface of the protrusion formed on one side of the pressing housing 134 so that the reference electrode 122 and the ground electrode 121 are energized separately from each other. The reference electrode connection surface 133 and the ground electrode connection surface 132 are protruded in a ring-shaped band shape separated from each other.

As described above, in Example 1, the conductive flexible ciliated electrode is formed in a general in-ear form, so there is no stress or pain even when worn for a long time, and yet, an internal contact pressure can be obtained which can obtain a large EEG signal with sufficient resolution, and a measurement electrode. The distance between (11) and the reference electrode (122) is large and a large signal can also be obtained.

<Second Example>

The second embodiment is a pressurized housing (34,334) consisting of a pressurized housing (334) in the form of an in-ear earphone that is connected to a hanger (34) and a hanger (34) hanging on the wheel as shown in FIG. Silicon electrodes in the form of in-ear earphones coupled to a pressurized housing in the housings 34 and 334, a reference electrode 31 and a reference electrode 31, and installed on a surface in contact with the skin on the temple side of the hanger 34 to be in close contact with the skin It consists of a measurement electrode 33 and a communication module 36 installed at the end of the antenna 35 extending from the pressure housing 334 of the pressure housings 34 and 334. However, the antenna 35 and the communication module 36 may be fixedly connected to the hanger 34 rather than the pressurized housing 334 unlike in FIG. 19.

Here, since the ground electrode 32 and the reference electrode 31 must be installed on one silicon tip in the form of one in-ear earphone, as in the first embodiment, the insulating band (as in the first embodiment) 233) is formed, and the reference electrode connection surface and the ground electrode connection surface (not shown) that are independently in close contact with the inner surfaces of the ground electrode 32 and the reference electrode 31 are formed in the pressure housing 334 to protrude in an independent circular band form. do.

On the other hand, the drowsiness driving detection system according to the present invention receives one of the three embodiments of the above-described EEG measurement earphones as shown in FIG. 9 and the EEG signal from the communication module installed in the headset, and is currently used as an EEG signal analysis app. It consists of a terminal that makes the brain wave state identifiable on a screen.

Here, the terminal is a device operated with an Android or IOS system, and a typical one is a smartphone or tablet. The terminal may show the frequency of the EEG over time and the brain state of the driver according to the state of the EEG as shown in FIG. 21 or FIG. 22.

The terminal is interlocked with Bluetooth from the communication module installed in the headset. At this time, the communication module has a built-in front-end amplifying circuit and a small Bluetooth unit (not shown) that detect and amplify the fine EEG signal, and detects and amplifies the EEG signal at the pico ampere level, and then amplifies the amplified analog signal through the AD converter. Converted into a signal, the converted digital signal is transmitted to the terminal by the built-in Bluetooth unit.

If the terminal analyzes the frequency of the measured EEG signal and distinguishes whether the EEG signal is alpha, beta, delta, or gamma, and within each type, the signal is subdivided by frequency to show the tendency of increasing the proportion of alpha waves. Algorithm calculation is performed to determine that it is entering a drowsiness state.

In the app running on the terminal, the EEG analysis algorithm is executed to record the trend of EEG changes over time, and based on this, the body condition and fatigue of the driver can be analyzed and used as an auxiliary data for judging whether or not drowsiness.

Accordingly, the EEG measuring earphone and the drowsy driving detection system according to the present invention use conductive flexible ciliated electrodes for the measuring electrode, the reference electrode, and the grounding electrode, and especially for the skin without causing pain or strain to the driver even when worn for a long time. It is possible to obtain a large signal with high resolution even when it is touched with pressure that does not give a sense of drowsiness, as well as significantly higher accuracy compared to the prior art. There is an effect that can be achieved properly.

The present invention described above is not limited by the above-described embodiments and the accompanying drawings, and various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. It will be obvious to those who have the knowledge of.

E: ear 11,21: measuring electrode
21: Temple 31,122: Reference electrode
33, 121: ground electrode 34: hanger
35: antenna 36,136: communication module
112: first connection hole 123,233: insulating band
124: second connection hole 131: measuring electrode connection surface
132: ground electrode connection surface 133: reference electrode connection surface
134,334: pressurized housing 135: cable

Claims (8)

delete delete delete delete delete delete A measurement electrode inserted into the ear canal; A differential amplification module connected to the measurement electrode with a cable and receiving the EEG signal received from the measurement electrode and amplifying the signal; A low-pass filter and a high-pass filter for receiving noise amplified from the differential amplification module and removing noise other than a biosignal; It consists of a communication module that transmits the EEG signal received from the low-pass filter and the high-pass filter by wire or wireless, and the measuring electrode is made of an elastic material and inserted into the ear canal, the surface of the measuring electrode is in close contact with the inner surface of the ear canal.
The measurement electrodes are isoprene rubber, silicone rubber, urethane rubber, butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, ethylene propylene rubber, butyl rubber, chlorosulfonated polyethylene rubber, acrylic rubber, polysulfide rubber, Made of a conductive elastic material formed by adding a conductive powder made of silver or platinum to an elastic material containing at least one of fluorine rubber and epichlorohydrin rubber,
The measuring electrode is formed by adding a curing agent and a conductive metal powder to liquid silicone,
Each of the particles constituting the metal powder is formed inside of a dendrite crystal structure,
The measurement electrode is formed in the form of a silicone tip that contacts the skin inside the ear canal in an in-ear earphone, and is provided one by one on both ears, and the measurement electrode is formed integrally with a reference electrode or a ground electrode, and the measurement electrode is a reference electrode or ground. It is electrically insulated due to an annular insulating band formed between the electrodes,
As a case in which the differential amplification module, a low-pass filter, and a notch filter are built in, at one end, a measuring electrode and a reference electrode or a protrusion inserted into the inside of the measuring electrode and the ground electrode are formed, and the measuring electrode and the reference electrode or the measuring electrode and ground A pressure housing is provided to close the surface of the electrode to the inner ear canal,
The projecting portion has a measuring electrode connection surface and a ground electrode connection surface protruding in a ring shape on an outer circumferential surface, or a measuring electrode connection surface and a reference electrode connection surface protruding in a ring shape on an outer circumferential surface, so that the measuring electrode is a ground electrode or A drowsy driving detection system using EEG measuring earphones that are completely insulated from the reference electrode and electrically.
The EEG measuring earphone;
It is composed of a terminal that identifies whether or not the state of sleepiness by analyzing the EEG signal received from the communication module,
The terminal is driven by an Android or iPhone operating system, a liquid crystal display is installed on the terminal, and an EEG signal analysis app for analyzing the EEG signal is installed on the terminal, so that the EEG state of the vehicle driver can be identified in real time,
A vibration plate for reproducing the voice signal at an audible frequency is built in the protrusion of the pressurized housing, and when it is determined that the EEG received by the terminal from the terminal is in a drowsy driving state, the terminal transmits a voice warning signal to the EEG measurement earphone. And, drowsiness driving detection system characterized in that to reproduce the voice alert through the diaphragm embedded in the EEG measurement earphones.
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