CN117796815A - Earphone system for monitoring electroencephalogram in auditory canal - Google Patents

Abstract

The invention provides an earphone system for monitoring electroencephalogram in an auditory canal, which comprises the following components: the left electroencephalogram collecting earplug and the right electroencephalogram collecting earplug are connected with the electroencephalogram collecting PCB module through conductive copper wires respectively, the grounding electrode is arranged on the conductive copper wires connected with the left electroencephalogram collecting earplug and the electroencephalogram collecting PCB module, the left electroencephalogram collecting earplug and the right electroencephalogram collecting earplug are identical in structure and comprise an earplug body, conductive copper coils are arranged on the earplug body and connected with the electroencephalogram collecting PCB module through the conductive copper wires, elastic foam is sleeved at the front end of the earplug body, conductive rubber and conductive silver coils are arranged on the elastic foam, and the conductive silver coils are connected with the conductive rubber through the conductive silver wires. The invention can collect the brain electrical signal when the user performs daily activities, simultaneously keeps comfort and portability, has convenient collection of brain electrical data, and can ensure the accuracy and usability of brain electrical data.

Description

A headphone system that can be used for electroencephalogram monitoring in the ear canal

Technical field

The invention relates to the technical field of EEG collection and detection, and in particular to an earphone system that can be used for EEG monitoring in the ear canal.

Background technique

In recent years, with the deepening of research on brain activity, EEG monitoring technology has been widely used in fields such as neurological disease diagnosis, health monitoring, sleep research, etc. However, most of the current EEG monitoring systems are head-mounted designs. Although they can provide accurate EEG signals in laboratory environments, their invasive design and complex use process limit their application in daily life or long-term monitoring.

In the existing technology, there are also reports on related technologies of EEG collection earphones. For example, the Chinese patent with publication number CN210871574U discloses an earphone-type EEG signal acquisition device, which includes two earphone bodies, a right module, a left module and The neckband is connected to the left and right modules. The headphone body, the right module and the left module are connected through signal lines; each headphone body includes a headphone shell and an ear support. The ear support is provided with a first electrode for collecting the reference potential. The inside of the headphone shell A second electrode and an earpiece are provided for collecting EEG signals; the right module includes a power supply system, a battery compartment and a charging port; the left module includes a chip board and a first brainwave chip and a second brainwave chip arranged on the chip board. , power supply voltage stabilizing chip, Bluetooth chip and antenna, the first brain wave chip processes the right EEG signal, and the second brain wave chip processes the left EEG signal; the neck hanger is made of shape memory functional material. The device is easy and comfortable to wear, realizes wireless collection and transmission of EEG signal data, and is of great significance to the research and application of brain science. However, the above-mentioned earphone-type EEG signal collection device has a complex structure, makes data collection inconvenient, and cannot ensure the accuracy and availability of EEG data.

Summary of the invention

In view of the shortcomings of the existing technology, the present invention proposes an earphone system that can be used for EEG monitoring in the ear canal, which can collect EEG signals when the user performs daily activities, while maintaining comfort and portability, and EEG data collection is convenient. , and can ensure the accuracy and availability of EEG data.

In order to realize the above technical solution, the present invention provides an earphone system that can be used for EEG monitoring in the ear canal, including: a left EEG collection earplug, a right EEG collection earplug, a ground electrode and an EEG collection PCB module. The EEG collection earplugs and the right EEG collection earplug are respectively connected to the EEG collection PCB module through conductive copper wires. The ground electrode is installed on the inside of the ear support used to support the EEG collection earplugs and is connected to the EEG collection PCB module through conductive copper wires. connection, the left EEG collection earplug and the right EEG collection earplug have the same structure, both including an earplug body, a conductive copper coil is installed on the earplug body, and the conductive copper coil is connected to the EEG collection PCB module through a conductive copper wire connection, the front end of the earplug body is sleeved with elastic foam, and the elastic foam is equipped with a circular conductive rubber. A conductive silver coil is installed at the contact point between the elastic foam and the conductive copper coil. The conductive silver coil is installed with the The conductive copper coil on the earplug body is in contact. The conductive silver coil is connected to the circular conductive rubber installed on the elastic foam through the conductive silver wire. The connection between the conductive silver wire and the circular conductive rubber is through a circular conductive adhesive. connect. In actual work, the left EEG collection earplug or the right EEG collection earplug is inserted behind the human ear. The round conductive rubber is used as a receiving electrode to collect EEG signals and transmits the EEG signals to conductive copper through conductive silver wires and conductive silver coils. The coil is then transmitted to the EEG collection PCB module through conductive copper wires.

Preferably, the left EEG collection earplug or the right EEG collection earplug is inserted into the back of the human ear, and the round conductive rubber is used as a receiving electrode to collect the EEG signal, and transmits the EEG signal to the conductive copper coil through the conductive silver wire and the conductive silver coil. , and then transmitted to the EEG collection PCB module through conductive copper wires.

Preferably, the conductive copper coil is a 2 mm wide copper ring, the outer side of the copper ring is connected to the conductive silver coil, and the inner side of the copper ring is welded to the conductive copper wire. The 2 mm wide conductive copper coil can form a perfect contact connection with the conductive silver coil on the inner wall of the earplug.

Preferably, the grounding electrode is made of conductive rubber, embedded in the inner side of the ear support, and connected to the conductive copper wire through a conductive adhesive. In actual use, when the ear support is worn, the grounding electrode will fit the skin of the human brain, have good long-term conformal contact with the skin, and can accurately receive and transmit the EEG signals generated by both sides of the brain, thereby improving the accuracy and stability of monitoring.

Preferably, the EEG collection PCB module includes a Bluetooth transmission PCB circuit board and a plastic shell. The Bluetooth transmission PCB circuit board is installed in the plastic shell. The inside of the plastic shell is wrapped by a copper mesh. The copper mesh wrapping can shield the outside. Signal interference, protect the internal signal reception, storage, and Bluetooth transmission PCB circuit board.

Preferably, a Bluetooth storage and transmission circuit is installed in the EEG acquisition PCB module, and the Bluetooth storage and transmission circuit includes a voltage follower I, a voltage follower II, an instrument amplifier, a second-order high-pass filter, a second-order low-pass filter, a boost circuit amplifier, resistors R _basi1 , R _basi2 , _RG , R ₁ , R 2 , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , R ₁₀ , capacitors C ₁ , C ₂ , C ₃ , C ₄ , wherein the positive electrode of the input end of the voltage follower I is connected to the conductive copper wire in the _left EEG acquisition earplug, the negative electrode and output end of the input end of the voltage follower I are both connected to the positive electrode of the input end of the instrument amplifier, one end of the resistor R _basi1 is connected to the conductive copper wire of the left EEG acquisition earplug, and the resistor R The other end of _basi1 is grounded, the positive electrode of the input end of the voltage follower II is connected to the conductive copper wire in the right EEG collection earplug, the negative electrode of the input end and the output end of the voltage follower II are both connected to the negative electrode of the input end of the instrumentation amplifier, one end of the resistor R _basi2 is connected to the conductive copper wire of the right EEG collection earplug, the other end of the resistor R _basi2 is grounded, one end of the resistor _RG is connected to the positive electrode of the instrumentation amplifier, the other end of the resistor _RG is connected to the negative electrode of the instrumentation amplifier, the output end of the instrumentation amplifier is connected to the capacitor _C1 , the other end of the capacitor _C1 is connected to the capacitor _C2 , the other end of the capacitor _C2 is connected to the positive electrode of the input end of the second-order high-pass filter, one end of the resistor _R1 is connected to the line between the capacitor _C2 and the positive electrode of the input end of the second-order high-pass filter, the other end of the resistor _R1 is grounded, the negative electrode of the input end of the second-order high-pass filter is connected to the resistor _R2 , the other end of the resistor _R2 is connected to the line connecting the capacitor _C1 and the capacitor _C2 , the output end of the second-order high-pass filter is connected to the resistor _R3 , the resistor R The other end of the resistor _R3 is connected to the resistor _R4 , the other end of the resistor _R4 is connected to the positive electrode of the second-order low-pass filter input end, one end of the capacitor _C4 is connected to the line connecting the resistor _R4 and the second-order low-pass filter, the other end of the capacitor _C4 is grounded, the negative electrode of the second-order low-pass filter input end is connected to one end of the capacitor _C3 , the other end of the capacitor _C3 is connected to the line connecting the resistor _R3 and the resistor _R4 , the output end of the second-order low-pass filter is connected to the resistor _R5 , the other end of the resistor _R5 is connected to the positive electrode of the boost circuit amplifier input end, one end of the resistor _R6 is connected to the connection line between the resistor _R5 and the boost circuit amplifier, the other end of the resistor _R6 is respectively connected to the resistor _R7 and the resistor _R8 , the other end of the resistor _R7 is connected to the input voltage VDC, the other end of the resistor _R8 is grounded, one end of the resistor _R9 is connected to the negative electrode of the boost circuit amplifier input end, one end of the resistor _R9 is connected to the output end of the boost circuit amplifier, and the resistor R One end of resistor _R10 is connected to the negative electrode of the input end of the boost circuit amplifier, and the other end of resistor _R10 is grounded. In actual operation, the EEG signals collected by the left EEG acquisition earplug and the right EEG acquisition earplug are converted into digital signals through voltage follower I and voltage follower II respectively, and then amplified by the instrument amplifier, and noise reduction is performed through a second-order high-pass filter and a second-order low-pass filter, and finally an accurate EEG digital signal is obtained through the boost circuit amplifier, and finally transmitted to the terminal smart device through the Bluetooth module, and processed by the terminal smart device to obtain the activity marker information or brain state of the brain, such as the brain's excitation state, tension, fatigue and emotions.

The beneficial effects of the earphone system provided by the present invention that can be used for EEG monitoring in the ear canal are:

(1) The headphone system that can be used for EEG monitoring in the ear canal has signal electrodes at the earplugs, ground electrodes at the ear supports, and a signal collection circuit in the signal collection device. The electrode and circuit design can accurately collect bioelectrical signals in the ear, store and transmit them, which helps to obtain the wearer's EEG signals and brain status more accurately and in real time, and not only enhances the efficiency of EEG signal collection The accuracy and real-time performance also improve the collection efficiency, opening up new exploration possibilities for the scientific research and application of EEG signals.

(2) The earphone system for intra-aural EEG monitoring has a simple structure and is easy to use. It can non-invasively collect EEG signals while the user is performing daily activities. At the same time, the system ensures the accuracy and availability of EEG data by effectively filtering, amplifying, and digitalizing signal processing, greatly improving the efficiency of EEG signal collection in daily environments and providing new possibilities for the research and application of EEG signals.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic structural diagram of the EEG collection earplug in the present invention.

Figure 3 is a schematic circuit diagram of the EEG collection PCB module in the present invention.

In the picture: 1. Left EEG collection earplug; 2. Right EEG collection earplug; 3. Ground electrode; 4. EEG collection PCB module; 11. Elastic foam; 12. Round conductive rubber; 13. Round conductive Adhesive; 14. Conductive silver wire; 15. Conductive silver coil; 16. Conductive copper coil; 17. Conductive copper wire; 18. Earplug body.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary people in the art without creative efforts belong to the protection scope of the present invention.

Embodiment: An earphone system that can be used for electroencephalogram monitoring in the ear canal.

Referring to Figures 1 and 2, a headphone system that can be used for EEG monitoring in the ear canal includes: a left EEG collection earplug 1, a right EEG collection earplug 2, a ground electrode 3 and an EEG collection PCB module 4. The left EEG collection earplug 1 and the right EEG collection earplug 2 are respectively connected to the EEG collection PCB module 4 through conductive copper wires 17. The ground electrode 3 is installed on the inside of the ear support used to support the EEG collection earplugs and passes through the conductive copper wire 17. The copper wire 17 is connected to the EEG collection PCB module 4. The left EEG collection earplug 1 and the right EEG collection earplug 2 are respectively provided with ear supports to facilitate the wearing of the left EEG collection earplug 1 and the right EEG collection earplug 2. The left EEG collection earplug 1 and the right EEG collection earplug 2 have the same structure, and both include an earplug body 18. A conductive copper coil 16 is installed on the earplug body 18. The conductive copper coil 16 is a 2mm wide copper ring. The outer side of the copper ring is connected to the conductive silver coil 15, and the inner side of the copper ring is welded to the conductive copper wire 17. The 2mm wide conductive copper coil can form a perfect contact connection with the conductive silver coil on the inner wall of the earplug. The conductive copper coil 16 is connected to the EEG collection PCB module 4 through a conductive copper wire 17. The front end of the earplug body 18 is sleeved with elastic foam 11, and a circular conductive rubber 12 is installed on the elastic foam 11. A conductive silver coil 15 is installed at the contact point between the elastic foam 11 and the conductive copper coil 16 . The conductive silver coil 15 is in contact with the conductive copper coil 16 installed on the earplug body 18 . The conductive silver coil 15 is connected to the conductive silver wire 14 through the conductive silver wire 14 . The circular conductive rubber 12 installed on the elastic foam 11 is connected, and the connection between the conductive silver wire 14 and the circular conductive rubber 12 is connected through a circular conductive adhesive 13 . In actual use, the left EEG collection earplug 1 or the right EEG collection earplug 2 is inserted into the human ear, and the circular conductive rubber 12 is used as a receiving electrode to collect EEG signals, and the EEG signals are collected through the conductive silver wire 14 and the conductive silver coil 15. The signal is transmitted to the conductive copper coil 16, and then transmitted to the EEG acquisition PCB module 4 through the conductive copper wire 17. The ground electrode 3 is made of conductive rubber, embedded inside the ear support, and connected to the conductive copper wire through conductive adhesive. In actual use, when the ear brace is worn, the ground electrode 3 will be in close contact with the skin of the human brain, having good long-term conformal contact ability with the skin, and can accurately receive and transmit the EEG signals generated by the brain on both sides. Improve monitoring accuracy and stability.

In this embodiment, the EEG collection PCB module 4 includes a Bluetooth transmission PCB circuit board and a plastic casing. The Bluetooth transmission PCB circuit board is installed in the plastic casing. The inside of the plastic casing is wrapped by a copper mesh, and the copper mesh wrapping can shield it. External signal interference protects the internal signal reception, storage, and Bluetooth transmission PCB circuit board.

The core components of this earphone system that can be used for EEG monitoring in the ear canal are a left EEG collection earplug 1 and a right EEG collection earplug 2 with EEG collection functions. The left EEG collection earplug 1 and the right EEG collection earplug 2. Contact with the user's ear canal skin to achieve the collection of bioelectrical signals, mainly EEG signals. The left EEG collection earplug 1 and the right EEG collection earplug 2 are connected to the EEG collection PCB module 4 through conductive copper wires 17, thereby transmitting the collected signals to the built-in PCB circuit board for storage and Bluetooth transmission, and finally the collected signals will be The bioelectrical signals are transmitted to smart devices with Bluetooth functions through Bluetooth transmission mode to facilitate subsequent processing and analysis.

Bioelectrical signals are electrical signals self-generated by neurons in the user's cerebral cortex. These signals can be analyzed by collecting neuron firing data in the cerebral cortex, and this analysis is very helpful for the research, diagnosis and prediction of neurological diseases. There are various methods of collecting bioelectric signals, such as wet electrode, semi-dry electrode, dry electrode, etc., but this embodiment will use conductive rubber as a dry electrode for measurement and collection.

When using this system, the circular conductive rubber 12 serves as a receiving electrode in contact with the user's ear canal skin, thereby collecting bioelectrical signals. The elastic foam 11 wrapped around it can provide sufficient support, increase the fit between the circular conductive rubber 12 as the receiving electrode and the user's skin, and improve the quality of signal collection and comfort of use.

It should be noted that the position of the receiving electrode includes but is not limited to the upper and lower parts of the ear canal. The present invention is not limited to this. In this embodiment, the electrode is placed in the upper part of the ear canal as an example. When worn, the receiving electrode contacts the skin in the ear canal and collects brain electrical signals.

In the present invention, the data transmission earphone head is made of elastic conductive copper wire, which has good elasticity and can ensure the stability of bioelectric signal transmission, greatly reduce the influence of small-amplitude movement on bioelectric signals, and ensure that the collected EEG signals have lower noise and better stability.

The wearing method of the present invention is currently limited to neck hanging, similar to the wearing method of Bluetooth sports headphones. The ear support must be hung on the ear first, the ground electrode 3 in Figure 1 is placed close to the left mastoid of the user, and then the earplug is inserted into the ear canal to fix it, and the EEG acquisition PCB module 4 is placed at the posterior cervical spine.

Referring to Figure 3, a Bluetooth storage and transmission circuit is installed in the EEG acquisition PCB module. The Bluetooth storage and transmission circuit includes a voltage follower I, a voltage follower II, an instrument amplifier, a second-order high-pass filter, and a second-order low-pass filter. amplifier, voltage boosting circuit amplifier, resistors _Rbasi1 , _Rbasi2 , _RG , _R1 , _R2 , _R3 , _R4 , _R5 , _R6 , _R7 , _R8 , _R9 , _R10 , capacitor _C1 , C ₂ , C ₃ , C ₄ , among which, the positive pole of the input terminal of the voltage follower I is connected to the conductive copper wire in the left EEG collection earplug, and the negative pole and output terminal of the input terminal of the voltage follower I are connected to the positive pole of the instrument amplifier input terminal. , one end of the resistor _Rbasi1 is connected to the conductive copper wire of the left EEG collection earplug, the other end of the resistor _Rbasi1 is connected to ground, the positive electrode of the input terminal of the voltage follower II is connected to the conductive copper wire of the right EEG collection earplug, and the voltage follower The negative pole of the input terminal and the output terminal of II are connected to the negative pole of the input terminal of the instrumentation amplifier. One end of the resistor _Rbasi2 is connected to the conductive copper wire of the right EEG collection earplug. The other end of the resistor _Rbasi2 is connected to the ground. One end of the resistor _RG is connected to the instrumentation amplifier. The positive terminal of the resistor R _G is connected to the negative terminal of the instrumentation amplifier. The output terminal of the instrumentation amplifier is connected to the capacitor C _1. The other terminal of the capacitor C ₁ is connected to the capacitor C _2. The other terminal of the capacitor C ₂ is connected to the second-order The positive terminal of the high-pass filter input terminal, one end of the resistor R ₁ is connected to the line between the capacitor C ₂ and the positive terminal of the second-order high-pass filter input terminal, the other terminal of the resistor R ₁ is connected to ground, and the negative terminal of the second-order high-pass filter input terminal is connected to the resistor R ₂ connection, the other end of resistor R ₂ is connected to the line connecting capacitor C ₁ and capacitor C ₂ , the output end of the second-order high-pass filter is connected to resistor R ₃ , the other end of resistor R ₃ is connected to resistor R ₄ , resistor R The other end of ₄ is connected to the positive pole of the input terminal of the second-order low-pass filter. One end of the capacitor C ₄ is connected to the line connecting the resistor R ₄ and the second-order low-pass filter. The other end of the capacitor C ₄ is connected to the ground. The second-order low-pass filter The negative pole of the filter input terminal is connected to one end of the capacitor C ₃ , and the other end of the capacitor C ₃ is connected to the line connecting the resistor R ₃ and the resistor R _4. The output terminal of the second-order low-pass filter is connected to the resistor R ₅ , and the resistor R The other end of ₅ boosts the positive electrode of the input end of the voltage boosting circuit amplifier. One end of resistor R ₆ is connected to the connection line between resistor R ₅ and the boost circuit amplifier. The other end of resistor R ₆ is connected to resistor R ₇ and resistor R ₈ respectively. The resistor The other end of R ₇ is connected to the input voltage VDC, the other end of the resistor R ₈ is connected to ground, one end of the resistor R ₉ is connected to the negative electrode of the input end of the voltage boost circuit amplifier, one end of the resistor R ₉ is connected to the output end of the voltage boost circuit amplifier, the resistor One end of R ₁₀ is connected to the negative pole of the input terminal of the voltage boost circuit amplifier, and the other end of resistor R ₁₀ is connected to ground. In actual work, the EEG signals collected through the left EEG collection earplug and the right EEG collection earplug are converted into digital signals through the voltage follower I and voltage follower II respectively, and then the signal is amplified through the instrument amplifier and passed through the second-order The high-pass filter and the second-order low-pass filter are used for noise reduction processing, and finally the accurate EEG digital signal is obtained through the boost circuit amplifier, and finally transmitted to the terminal smart device through the Bluetooth module, and processed by the terminal smart device to obtain the brain activity Signature information or brain states, such as brain arousal, tension, fatigue, and mood.

As shown in Figure 3, the Bluetooth storage and transmission circuit may include filters, amplifiers, operational amplifiers, ADCs, etc., which are not limited in this example. The transmission module may include one or more of a pre-sized Type-C interface and a customized headphone interface. The bioelectrical signal can be converted into a digital signal through a signal collection circuit, and the bioelectrical signal can be denoised to obtain an EEG signal. Noise can be reduced by resampling, smoothing, high-pass filtering, low-pass filtering, notch filtering, and wavelet filtering of bioelectrical signals. Noise reduction methods may include the use of machine learning algorithms, such as CNN (Convolutional Neural Network, Convolutional Neural Network), SVM (Support Vector Machine, Support Vector Machine), etc. This embodiment does not limit this. Noise reduction can also include the removal of motion artifacts. In the specific implementation process, when the EEG signal is obtained, the EEG signal can be transmitted to the terminal intelligent device and processed by the terminal intelligent device to obtain the brain activity signature information or brain state, such as the brain's excitation state, tension degree, fatigue level, mood, etc.

In this embodiment, the signal collection circuit is connected to the bioelectric signal receiving electrode through conductive copper wires 17 . In a specific implementation process, the signal collection circuit can transmit data to the terminal smart device through a wireless connection or a wired connection. The wireless connection method is Bluetooth transmission mode, and the wired connection can be connected through wires, etc. This embodiment has no limitation on this. After the signal collection circuit is connected to the terminal smart device, the terminal smart device can be a mobile phone, a tablet, a computer, etc., and this embodiment does not limit this.

The earphone system that can be used for EEG monitoring in the ear canal has a simple structure and is easy to use. It can non-invasively collect EEG signals while the user is performing daily activities. At the same time, the system ensures the accuracy and availability of EEG data through effective filtering, amplification and digital signal processing, greatly improves the collection efficiency of EEG signals in daily environments, and provides information for the research and application of EEG signals. new possibilities.

The earphone system that can be used for EEG monitoring in the ear canal has signal electrodes at the earplugs of the earphones, ground electrodes at the ear supports, and a signal collection circuit in the signal collection device. The electrode and circuit design can accurately collect bioelectrical signals in the ear, store and transmit them, which helps to obtain the wearer's EEG signals and brain status more accurately and in real time, and not only enhances the efficiency of EEG signal collection The accuracy and real-time performance also improve the collection efficiency, opening up new possibilities for exploration in the field of scientific research and application of EEG signals.

The above are only the preferred embodiments of the present invention, but the present invention should not be limited to the embodiments and the contents disclosed in the drawings. Therefore, any equivalents or modifications made without departing from the spirit disclosed in the present invention are fall within the protection scope of the present invention.

Claims (6)

1. An earphone system that can be used for EEG monitoring in the ear canal, characterized by comprising: a left EEG collection earplug, a right EEG collection earplug, a ground electrode and an EEG collection PCB module, the left EEG collection earplug, The right EEG collection earplug is connected to the EEG collection PCB module through a conductive copper wire. The ground electrode is installed on the inside of the ear support used to support the EEG collection earplug and is connected to the EEG collection PCB module through a conductive copper wire. The left EEG collection earplug is connected to the EEG collection PCB module through a conductive copper wire. The structure of the EEG collection earplug and the right EEG collection earplug are the same, and both include an earplug body. A conductive copper coil is installed on the earplug body. The conductive copper coil is connected to the EEG collection PCB module through a conductive copper wire. The earplug The front end of the body is sleeved with elastic foam, and a round conductive rubber is installed on the elastic foam. A conductive silver coil is installed at the contact point between the elastic foam and the conductive copper coil. The conductive silver coil is in contact with the earplug body. The conductive copper coil is in contact, and the conductive silver coil is connected to the circular conductive rubber installed on the elastic foam through a conductive silver wire. The connection between the conductive silver wire and the circular conductive rubber is connected through a circular conductive adhesive. 2. The earphone system that can be used for EEG monitoring in the ear canal as claimed in claim 1, characterized in that the left EEG collection earplug or the right EEG collection earplug is inserted into the back of the human ear, and the round conductive rubber is used as a receiving electrode to collect the earphone. The EEG signal is transmitted to the conductive copper coil through the conductive silver wire and the conductive silver coil, and then transmitted to the EEG acquisition PCB module by the conductive copper wire. 3. The earphone system that can be used for electroencephalogram monitoring in the ear canal as claimed in claim 1, wherein the conductive copper coil is a 2 mm wide copper ring, and the outer side of the copper ring is connected to the conductive silver coil. The inside is welded with conductive copper wire. 4. The earphone system that can be used for electroencephalogram monitoring in the ear canal as claimed in claim 1, wherein the ground electrode is made of conductive rubber, embedded inside the ear support, and connected to the ear through conductive adhesive. Conductive copper wire connection. 5. The earphone system that can be used for EEG monitoring in the ear canal as claimed in claim 1, wherein the EEG collection PCB module includes a Bluetooth transmission PCB circuit board and a plastic shell, and the Bluetooth transmission PCB circuit board is installed In the plastic shell, the inner side of the plastic shell is wrapped by a copper mesh. 6. The earphone system that can be used for EEG monitoring in the ear canal according to claim 1, characterized in that a Bluetooth storage and transmission circuit is installed in the EEG collection PCB module, and the Bluetooth storage and transmission circuit includes a voltage follower. Ⅰ. Voltage follower Ⅱ, instrumentation amplifier, second-order high-pass filter, second-order low-pass filter, boost circuit amplifier, resistors _Rbasi1 , _Rbasi2 , _RG , _R1 , _R2 , _R3 , _R4 , R ₅ , R ₆ , R ₇ , R ₈ , R ₉ , R ₁₀ , capacitor C ₁ , C ₂ , C ₃ , C ₄ , among which, the positive electrode of the input terminal of voltage follower I is connected with the conductive copper in the left EEG collection earplug. Line connection, the negative pole and output terminal of the input terminal of the voltage follower I are connected to the positive terminal of the instrument amplifier input terminal, one end of the resistor _Rbasi1 is connected to the conductive copper wire of the left EEG collection earplug, the other end of the resistor _Rbasi1 is connected to the ground, and the voltage follows The positive electrode of the input terminal of the voltage follower II is connected to the conductive copper wire in the right EEG collection earplug. The negative electrode and output terminal of the input terminal of the voltage follower II are connected to the negative electrode of the instrument amplifier input terminal. One end of the resistor _Rbasi2 is connected to the right EEG collection earplug. On the conductive copper wire, the other end of the resistor _Rbasi2 is connected to ground, one end of the resistor R _G is connected to the positive electrode of the instrumentation amplifier, the other end of the resistor R _G is connected to the negative electrode of the instrumentation amplifier, the output end of the instrumentation amplifier is connected to the capacitor C ₁ , and the capacitor The other end of C ₁ is connected to the capacitor C ₂ , the other end of the capacitor C ₂ is connected to the positive electrode of the input terminal of the second-order high-pass filter, and one end of the resistor R ₁ is connected to the line between the capacitor C ₂ and the positive electrode of the input terminal of the second-order high-pass filter. , the other end of resistor R ₁ is connected to ground, the negative pole of the input end of the second-order high-pass filter is connected to resistor R ₂ , the other end of resistor R ₂ is connected to the line connecting capacitor C ₁ and capacitor C ₂ , the output of the second-order high-pass filter One end of the resistor R ₃ is connected to the resistor R ₃ , the other end of the resistor R ₃ is connected to the resistor R 4 , the other end of the resistor R ₄ is connected to the positive pole of the second-order low-pass filter input, and one end of the capacitor C ₄ is connected between the resistor R ₄ and the second-order low-pass filter. On the line connected to the low-pass filter, the other end of the capacitor C ₄ is connected to ground. The negative electrode of the input end of the second-order low-pass filter is connected to one end of the capacitor C _3. The other end of the capacitor C ₃ is connected to the resistor R ₃ and the resistor R _4. On the line, the output end of the second-order low-pass filter is connected to the resistor R _5. The other end of the resistor R ₅ boosts the positive electrode of the input circuit amplifier. One end of the resistor R ₆ is connected to the connection between the resistor R ₅ and the boost circuit amplifier. On the line, the other end of resistor R ₆ is connected to resistor R ₇ and resistor R ₈ respectively. The other end of resistor R ₇ is connected to the input voltage VDC. The other end of resistor R ₈ is connected to ground. One end of resistor R ₉ is connected to the boost circuit amplifier. The negative electrode of the input end is connected, one end of the resistor R ₉ is connected to the output end of the voltage boost circuit amplifier, one end of the resistor R ₁₀ is connected to the negative electrode of the input end of the voltage boost circuit amplifier, and the other end of the resistor R ₁₀ is connected to ground.