CN116392144B - Brain signal acquisition system, method and medium - Google Patents
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Abstract
The application provides a brain signal acquisition system, a brain signal acquisition method and a brain signal acquisition medium, and relates to the technical field of brain-computer interfaces. This brain signal acquisition system includes: a plurality of electroencephalogram acquisition apparatuses; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at the position of the target scalp to acquire electroencephalogram signals corresponding to the position of the target scalp; the Laplace electrode is used for detecting a first electroencephalogram signal on the surface of the scalp; the amplifier module is used for amplifying the first electroencephalogram signal to obtain a second electroencephalogram signal; the analog-to-digital conversion module is used for converting the second brain electrical signal into a digital signal to obtain a target brain electrical signal; the wireless communication module is used for transmitting the target brain electrical signal to the data processing device in a wireless transmission mode so that the data processing device analyzes the target brain electrical signal; the power module is used for supplying power to the electroencephalogram acquisition equipment. The system can improve the efficiency of brain signal acquisition.
Description
Technical Field
The application relates to the technical field of brain-computer interfaces, in particular to a brain signal acquisition system, a brain signal acquisition method and a brain signal acquisition medium.
Background
The brain signal EEG (electroencephalogram) can reflect the electrophysiological activity of the brain nerve cells and can interpret the instructions and intent of the "inside" of the brain. EEG has the advantages of high time resolution, non-invasiveness, low price and the like, and is widely focused in brain disease diagnosis, brain-computer interface, depression diagnosis and nerve feedback application.
Brain signal acquisition systems, also known as EEG acquisition systems, typically include brain electrical acquisition electrodes, amplifiers, and brain electrical caps. The brain electrical acquisition electrode is the core of the brain signal acquisition system, and directly influences the quality of brain electrical signal monitoring. The electroencephalogram acquisition electrode of the existing brain signal acquisition system is mainly realized based on a common disc electroencephalogram electrode, is influenced by the brain volume conductor effect, has low spatial resolution, influences the signal-to-noise ratio and classification accuracy of brain signal acquisition, is mainly applied to scientific research and medical scenes, is not suitable for being used in outdoor and low-coordination scenes, has limitation, severely restricts the wide application and further development of the brain signal acquisition system, and is one of important problems facing the development of the existing EEG acquisition system.
The brain signal acquisition system in the related art has the advantages that the convenience of brain signal acquisition is poor, the brain signal acquisition is easily influenced by the brain volume conductor effect, the spatial resolution is low, the signal to noise ratio and the classification accuracy of the brain signal acquisition are influenced, and therefore the efficiency of the brain signal acquisition is low. How to provide a brain signal acquisition system, improve brain signal acquisition's efficiency, have important practical meaning.
Disclosure of Invention
The embodiment of the application provides a brain signal acquisition system, a brain signal acquisition method and a brain signal acquisition medium, which can improve the brain signal acquisition efficiency.
In a first aspect, an embodiment of the present application provides a brain signal acquisition system, including:
a plurality of electroencephalogram acquisition apparatuses; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at a target scalp position so as to acquire electroencephalogram signals corresponding to the target scalp position;
the Laplace electrode is used for detecting a first electroencephalogram signal on the surface of the scalp;
the amplifier module is used for amplifying the first electroencephalogram signal to obtain a second electroencephalogram signal;
the analog-to-digital conversion module is used for converting the second electroencephalogram signal into a digital signal to obtain the target electroencephalogram signal;
the wireless communication module is used for sending the target brain electrical signal to a data processing device in a wireless transmission mode so that the data processing device can analyze the target brain electrical signal;
the power module is used for supplying power to the electroencephalogram acquisition equipment.
The brain signal acquisition system provided by the embodiment of the application comprises a plurality of brain electrical acquisition devices, wherein each brain electrical acquisition device comprises a Laplacian electrode, and any brain electrical acquisition device is placed at a target scalp position to acquire brain electrical signals corresponding to the target scalp position. According to the brain signal acquisition system, any one of a plurality of brain signal acquisition devices is placed at the position of a target scalp, so that brain signals corresponding to the position of the target scalp are acquired.
In one possible implementation, the electroencephalogram acquisition apparatus further includes a controller; the controller is respectively connected with the analog-to-digital conversion module and the wireless communication module; the controller is used for controlling the wireless communication module to send the target electroencephalogram signal in a wireless transmission mode when receiving the target electroencephalogram signal sent by the analog-to-digital conversion module.
The brain signal acquisition system provided by the embodiment, the brain electricity acquisition device further comprises a controller; the controller is respectively connected with the analog-to-digital conversion module and the wireless communication module; the controller is used for controlling the wireless communication module to transmit the target brain electrical signal in a wireless transmission mode when receiving the target brain electrical signal transmitted by the analog-to-digital conversion module, so that any brain electrical acquisition equipment of the brain signal acquisition system is placed at a target scalp position, can acquire the brain electrical signal corresponding to the target scalp position, can independently control the transmission of the acquired target brain electrical signal in the wireless transmission mode, further improves the portability of the brain signal acquisition system, and improves the brain signal acquisition efficiency.
In one possible implementation, the laplace electrode comprises 3 first electrode units separated by insulating material; the first electrode unit comprises a first electroencephalogram electrode, a first reference electrode and a right leg driving electrode; the first reference electrode is arranged inside the first electroencephalogram electrode.
The brain signal acquisition system provided by the embodiment, wherein the laplace electrode comprises 3 first electrode units separated by insulating materials; the first electrode unit comprises a first electroencephalogram electrode, a first reference electrode and a right leg driving electrode; the first reference electrode is arranged inside the first electroencephalogram electrode. The brain signal acquisition system adopts the Laplace electrode composed of three electrodes of brain electricity, reference and right leg, so that brain signal acquisition points in the brain signal acquisition process are more concentrated, portability of the brain signal acquisition system is further improved, and the brain signal acquisition efficiency is improved.
In one possible implementation, the electroencephalogram acquisition apparatus further includes a first right leg drive circuit; the amplifier module is respectively connected with the first reference electrode, the first electroencephalogram electrode, the right leg driving circuit and the analog-to-digital conversion module, and the right leg driving circuit is connected with the right leg driving electrode.
The brain signal acquisition system provided by the embodiment, the brain electricity acquisition device further comprises a first right leg driving circuit; the amplifier module is respectively connected with the first reference electrode, the first electroencephalogram electrode, the right leg driving circuit and the analog-to-digital conversion module, and the right leg driving circuit is connected with the right leg driving electrode. The brain signal acquisition system is provided with a first right leg driving circuit, wherein the amplifier module is respectively connected with the first reference electrode, the first brain electrode, the right leg driving circuit and the analog-to-digital conversion module, and the right leg driving circuit is connected with the right leg driving electrode, so that the circuit level of the brain signal acquisition equipment and the human body level are the same level, the portability of the brain signal acquisition system can be improved, the stability and the accuracy of acquired brain signal can be improved, and the brain signal acquisition efficiency is further improved.
In one possible implementation, the first right leg driving circuit includes a high pass filter; and the cut-off frequency of the high-pass filter is smaller than the preset target common-mode signal frequency.
The brain signal acquisition system provided by this embodiment, the first right leg driving circuit includes a high pass filter; and the cut-off frequency of the high-pass filter is smaller than the preset target common-mode signal frequency. The brain signal acquisition system realizes more efficient amplification of the selected common-mode alternating signal, improves the dynamic range of the operational amplifier, meets the requirement of high dynamic range under a low power domain, improves the portability of the brain signal acquisition system, improves the stability and the accuracy of the acquired brain signal, and can further improve the efficiency of brain signal acquisition.
In one possible implementation, the laplace electrode comprises 2 second electrode units separated by an insulating material; the second electrode unit comprises a second electroencephalogram electrode and a second reference electrode; the second reference electrode is arranged inside the second electroencephalogram electrode.
The brain signal acquisition system provided by the embodiment, the laplace electrode comprises 2 second electrode units separated by insulating materials; the second electrode unit comprises a second electroencephalogram electrode and a second reference electrode; the second reference electrode is arranged inside the second electroencephalogram electrode. The Laplacian electrode of the brain signal acquisition system is a modularized double-ring Laplacian electrode, so that the size of the electrode can be preferentially reduced, the flexibility in application is improved, the portability of the brain signal acquisition system is further improved, and the brain signal acquisition efficiency is improved.
In one possible implementation, the electroencephalogram acquisition apparatus further includes a second right leg drive circuit; the amplifier module is respectively connected with the second reference electrode, the second electroencephalogram electrode, the second right leg driving circuit and the analog-to-digital conversion module, and the second right leg driving circuit is connected with the second reference electrode or the second electroencephalogram electrode.
The brain signal acquisition system provided by the embodiment, the brain electricity acquisition device further comprises a second right leg driving circuit; the amplifier module is respectively connected with the second reference electrode, the second electroencephalogram electrode, the second right leg driving circuit and the analog-to-digital conversion module, and the second right leg driving circuit is connected with the second reference electrode or the second electroencephalogram electrode. The brain signal acquisition system is connected with the double-ring Laplace electrode through the second right leg driving circuit, the second right leg driving circuit is connected with the second reference electrode or the second brain electrode, a direct current bias loop is provided for the amplifier, noise can be restrained, common mode interference is reduced, normal operation of the brain signal acquisition system is ensured, portability of the brain signal acquisition system can be improved, and meanwhile stability and accuracy of acquired brain signal can be improved.
In one possible implementation manner, the electroencephalogram acquisition apparatus further includes a third right leg driving circuit, a first resistor, and a second resistor; the amplifier module is respectively connected with the second reference electrode, the second electroencephalogram electrode, the third right leg driving circuit and the analog-to-digital conversion module, the first resistor and the second resistor are connected in series between the second reference electrode and the second electroencephalogram electrode, and the third right leg driving circuit is connected to a connection point of the first resistor and the second resistor.
According to the brain signal acquisition system provided by the embodiment, the third right leg driving circuit is connected with the double-loop Laplacian electrode, the first resistor and the second resistor are connected in series between the second reference electrode and the second brain electrode, and the third right leg driving circuit is connected to the connection point of the first resistor and the second resistor to provide a direct current bias loop for the amplifier, so that noise can be effectively restrained, common mode interference can be reduced, normal operation of the brain signal acquisition system is ensured, portability of the brain signal acquisition system is improved, and meanwhile stability and accuracy of acquired brain signals can be effectively improved.
In a second aspect, an embodiment of the present application provides a brain signal acquisition method, which is applied to a brain signal acquisition system, where the brain signal acquisition system includes a plurality of electroencephalogram acquisition devices; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at a target scalp position so as to acquire electroencephalogram signals corresponding to the target scalp position; the power supply module is used for supplying power to the electroencephalogram acquisition equipment;
the method comprises the following steps:
detecting a first electroencephalogram signal at a target scalp location; the target scalp position is the position of the scalp surface placed by the electroencephalogram acquisition equipment;
performing signal processing on the first electroencephalogram signal to obtain a second electroencephalogram signal;
converting the second electroencephalogram signal into a digital signal to obtain the target electroencephalogram signal;
and sending the target brain electrical signal to a data processing device in a wireless transmission mode so that the data processing device analyzes the target brain electrical signal.
According to the brain signal acquisition method provided by the embodiment, any one of a plurality of brain signal acquisition devices included in the brain signal acquisition system is placed at the target scalp position, so that brain signals corresponding to the target scalp position are acquired.
In one possible implementation manner, before the target electroencephalogram signal is sent to the data processing apparatus through a wireless transmission manner, the method further includes:
generating a signal sending instruction based on the target electroencephalogram signal; the signal sending instruction is used for indicating to send the target brain electrical signal in a wireless transmission mode.
The brain signal acquisition method provided by the embodiment provides a brain signal discrete acquisition mechanism, any brain electrical acquisition equipment of a brain signal acquisition system is placed at a target scalp position, can acquire brain electrical signals corresponding to the target scalp position, can realize independent control of transmitting the acquired target brain electrical signals in a wireless transmission mode, further improves portability of the brain signal acquisition system, can reduce interference of brain volume conductor effect on brain signal acquisition, improves spatial resolution of brain electrical signals, and improves brain signal acquisition efficiency.
In one possible implementation, the laplace electrode comprises a plurality of electrode units; the electrode unit comprises an electroencephalogram electrode and a reference electrode; the detecting a first electroencephalogram signal at a target scalp location includes:
determining a first electroencephalogram signal at the target scalp position through the electroencephalogram electrode included in the target laplace electrode and the reference electrode included in the target laplace electrode; the target laplace electrode is the laplace electrode at the target scalp location; the electroencephalogram electrode included in the target Laplace electrode and the reference electrode included in the target Laplace electrode are respectively connected to the amplifier module included in the target Laplace electrode to form a small loop to acquire the electroencephalogram signal of the target position.
According to the brain signal acquisition method provided by the embodiment, the first brain electrical signal at the target scalp position is determined through the brain electrical electrode included in the target Laplace electrode and the reference electrode included in the target Laplace electrode; the target laplace electrode is the laplace electrode at the target scalp location; the electroencephalogram electrode included in the target Laplace electrode and the reference electrode included in the target Laplace electrode are respectively connected to the amplifier module included in the target Laplace electrode to form a small loop to acquire the electroencephalogram signal of the target position. The brain signal acquisition method realizes small loop lead configuration based on the Laplace electrode, acquires the brain signal corresponding to the target scalp position by using the near-end reference electrode which is close to the brain electrode, has smaller loop of the brain signal compared with the method of indirectly acquiring the brain signal corresponding to the target scalp position by using the far-end reference electrode at the earlobe position, does not need the reference electrode arranged at the far end of the acting electrode, avoids being influenced by the activation of the reference electrode, can not only improve the portability of a brain signal acquisition system, but also improve the stability and the accuracy of the acquired brain signal, and further improve the efficiency of brain signal acquisition.
In a third aspect, embodiments of the present application provide a computer-readable storage medium having a computer program stored therein, which when executed by a processor, implements the method of any of the second aspects.
The technical effects caused by any implementation manner of the third aspect may be referred to the technical effects caused by the implementation manner of the second aspect, which are not described herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is one of the schematic diagrams of a brain signal acquisition system of the prior art for brain signal acquisition;
FIG. 2 is a second schematic diagram of a brain signal acquisition system according to the prior art;
FIG. 3 is a block diagram of a brain signal acquisition system according to an embodiment of the present application;
fig. 4 is a schematic diagram of a right leg driving circuit of a brain signal acquisition system according to an embodiment of the present application;
FIG. 5 is a second block diagram of a brain signal acquisition system according to an embodiment of the present application;
FIG. 6 is a third block diagram of a brain signal acquisition system according to an embodiment of the present application;
fig. 7 is a schematic flow chart of a brain signal acquisition method according to an embodiment of the present application;
fig. 8 is a schematic diagram of forming a small loop in a brain signal acquisition method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The brain signal EEG (electroencephalogram) can reflect the electrophysiological activity of the brain nerve cells and can interpret the instructions and intent of the "inside" of the brain. EEG has the advantages of high time resolution, non-invasiveness, low price and the like, and is widely focused in brain disease diagnosis, brain-computer interface, depression diagnosis and nerve feedback application.
Brain signal acquisition systems, also known as EEG acquisition systems, typically include brain electrical acquisition electrodes, amplifiers, and brain electrical caps. The brain electrical acquisition electrode is the core of the brain signal acquisition system, and directly influences the quality of brain electrical signal monitoring.
Fig. 1 shows a schematic diagram of a brain signal acquisition system according to the prior art. When brain signals are collected, a large loop is formed to influence the collection quality of EEG, one of the large loops is a large loop 1 formed between the brain signals and an amplifier, referring to fig. 1, the brain signals at the scalp position collected by an electroencephalogram collection electrode 100 are transmitted to the amplifier through a lead and then returned to a reference electrode at the earlobe position from the amplifier, the scalp, the lead and the amplifier form the large loop 1, when a human body moves, motion artifacts can be easily introduced, space electromagnetic interference is easily received, and the brain signal collection system with the large loop 1 has extremely weak anti-interference capability.
Fig. 2 shows a schematic diagram of a brain signal acquisition by another brain signal acquisition system of the prior art. When acquiring brain signals, a large loop is existed to influence the acquisition quality of EEG, and the other large loop is a large loop 2 formed by an electroencephalogram acquisition electrode at the scalp position and a reference electrode, see FIG. 2, wherein O is acquired through the brain signals at the scalp position acquired by the electroencephalogram acquisition electrode 200 2 And A is a 2 Brain electrical signals (A) 2 As a reference electrode), but since this large loop 2 includes T 6 、P 4 Even other brain area signals that interfere with O 2 Brain signals at locations result in low spatial resolution.
The electroencephalogram acquisition electrode of the existing brain signal acquisition system is mainly realized based on a common disc electroencephalogram electrode, is influenced by the brain volume conductor effect, has low spatial resolution, influences the signal-to-noise ratio and classification accuracy of brain signal acquisition, is mainly applied to scientific research and medical scenes, is not suitable for being used in outdoor and low-coordination scenes, has limitation, severely restricts the wide application and further development of the brain signal acquisition system, and is one of important problems facing the development of the existing EEG acquisition system.
The brain signal acquisition system in the related art has the advantages that the convenience of brain signal acquisition is poor, the brain signal acquisition is easily influenced by the brain volume conductor effect, the spatial resolution is low, the signal to noise ratio and the classification accuracy of the brain signal acquisition are influenced, and therefore the efficiency of the brain signal acquisition is low. How to provide a brain signal acquisition system, improve brain signal acquisition's efficiency, have important practical meaning.
Based on the above, the embodiment of the application provides a brain signal acquisition system, a brain signal acquisition method and a brain signal acquisition medium. Wherein, this brain signal acquisition system includes: a plurality of electroencephalogram acquisition apparatuses; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at the position of the target scalp to acquire electroencephalogram signals corresponding to the position of the target scalp;
the Laplace electrode is used for detecting a first electroencephalogram signal on the surface of the scalp;
the amplifier module is used for amplifying the first electroencephalogram signal to obtain a second electroencephalogram signal;
the analog-to-digital conversion module is used for converting the second brain electrical signal into a digital signal to obtain a target brain electrical signal;
the wireless communication module is used for transmitting the target brain electrical signal to the data processing device in a wireless transmission mode so that the data processing device analyzes the target brain electrical signal;
the power module is used for supplying power to the electroencephalogram acquisition equipment. The brain signal acquisition system comprises a plurality of brain signal acquisition devices, each brain signal acquisition device comprises a Laplace electrode, any brain signal acquisition device is placed at a target scalp position, and brain signals corresponding to the target scalp position can be acquired, so that the brain signal acquisition system can acquire brain signals corresponding to the target scalp position by placing any one of the plurality of brain signal acquisition devices at the target scalp position, and the brain signal acquisition system with the discrete brain signal acquisition module is provided, so that portability of the brain signal acquisition system can be improved, and brain signal acquisition efficiency is improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the present application will be described in detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 3 shows a block diagram of a brain signal acquisition system according to an embodiment of the present application, and as can be seen from the block diagram shown in fig. 3, the brain signal acquisition system 30 includes: a plurality of electroencephalogram acquisition apparatuses 300; the electroencephalogram acquisition device 300 comprises a Laplace electrode 301, an amplifier module 302, an analog-to-digital conversion module 303, a wireless communication module 304 and a power supply module 305; the electroencephalogram acquisition device 300 is used for being placed at a target scalp position to acquire electroencephalogram signals corresponding to the target scalp position;
the laplace electrode 301 is used for detecting a first electroencephalogram signal on the scalp surface;
the amplifier module 302 is configured to amplify the first electroencephalogram signal to obtain a second electroencephalogram signal;
the analog-to-digital conversion module 303 is configured to convert the second electroencephalogram signal into a digital signal, so as to obtain a target electroencephalogram signal;
the wireless communication module 304 is configured to send the target electroencephalogram signal to the data processing apparatus 20 through a wireless transmission manner, so that the data processing apparatus 20 analyzes the target electroencephalogram signal;
the power module 305 is used to power the electroencephalogram acquisition apparatus 300.
The brain signal acquisition system provided in this embodiment includes: a plurality of electroencephalogram acquisition apparatuses; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at the position of the target scalp to acquire electroencephalogram signals corresponding to the position of the target scalp; the Laplace electrode is used for detecting a first electroencephalogram signal on the surface of the scalp; the amplifier module is used for amplifying the first electroencephalogram signal to obtain a second electroencephalogram signal; the analog-to-digital conversion module is used for converting the second brain electrical signal into a digital signal to obtain a target brain electrical signal; the wireless communication module is used for transmitting the target brain electrical signal to the data processing device in a wireless transmission mode so that the data processing device analyzes the target brain electrical signal; the power module is used for supplying power to the electroencephalogram acquisition equipment. According to the brain signal acquisition system with the split brain signal acquisition module, any one of the plurality of brain signal acquisition devices is placed at the position of the target scalp, so that brain signals corresponding to the position of the target scalp are acquired.
In some embodiments of the brain signal acquisition system 30, as shown in fig. 3, the brain electrical acquisition device 300 further includes a controller 306; the controller 306 is respectively connected with the analog-to-digital conversion module 303 and the wireless communication module 304; the controller 306 is configured to control the wireless communication module 304 to transmit the target electroencephalogram signal in a wireless transmission manner when receiving the target electroencephalogram signal transmitted by the analog-to-digital conversion module 303.
In some embodiments of the brain signal acquisition system 30, the brain signal acquisition system 30 includes a laplace electrode 301, as shown in fig. 3, comprising 3 first electrode units 3011 separated by insulating material; the first electrode unit includes a first electroencephalogram electrode 30111, a first reference electrode 30112, and a right leg driving electrode 30113; the first reference electrode 30112 is disposed inside the first electroencephalogram electrode 30111.
It is to be noted that the relative positions of the first brain electrode 30111, the first reference electrode 30112, and the right leg drive electrode 30113 shown in fig. 3 may be interchanged. Fig. 3 does not constitute a definition of the relative positions of the first electroencephalogram electrode, the first reference electrode, and the right leg drive electrode. In an embodiment of the present application, the positions of the first brain electrode 30111, the first reference electrode 30112, and the right leg drive electrode 30113 may be interchanged. For example, in some other embodiments, the first electroencephalogram electrode may be disposed inside the first reference electrode.
In addition, the technical scheme of the application also does not limit the shapes of the first electroencephalogram electrode, the first reference electrode and the right leg driving electrode. For example, in some embodiments, the first electroencephalographic electrode and the right leg drive electrode can be circular hollow electrodes and the first reference electrode can be a dot-plane electrode; in other embodiments, the first electroencephalographic electrode and the right leg drive electrode can be square hollow electrodes and the first reference electrode can be a square planar electrode.
In some embodiments of the brain signal acquisition system 30, referring to fig. 3, the brain electrical acquisition device 300 further comprises a first right leg drive circuit 307; the amplifier module 302 is connected to the first reference electrode 30112, the first electroencephalogram electrode 30111, the first right leg driving circuit 30113, and the analog-to-digital conversion module 303, respectively, and the first right leg driving circuit 307 is connected to the right leg driving electrode 30113.
In some embodiments of the brain signal acquisition system 30, as shown in fig. 4, the first right leg drive circuit 307 includes a high pass filter 400; the cut-off frequency of the high pass filter 400 is less than the preset target common mode signal frequency.
In practice, the high pass filter may be implemented by connecting a capacitor and a resistor in series.
Referring to fig. 4, the amplifier module 302 includes an operational amplifier A1 and an operational amplifier A2; the first right leg driving circuit 307 includes a high-pass filter 400 formed by a capacitor C1 and a resistor R1, where the cut-off frequency of the high-pass filter 400 is smaller than the target common-mode signal frequency, for example, to suppress 50Hz common-mode interference, and the cut-off frequency of the high-pass filter 400 should be lower than 50Hz to prevent the direct-current voltage at the a point, and only the common-mode alternating signal at the a point is reversely amplified, so as to increase the dynamic range of the operational amplifier A3.
In some embodiments of the brain signal acquisition system 30, referring to fig. 5, the laplace electrode 301 includes 2 second electrode units 3011' divided by an insulating material; the second electrode unit 3011' includes a second electroencephalogram electrode 30111' and a second reference electrode 30112'; the second reference electrode 30112 'is arranged inside the second electroencephalogram electrode 30111'.
In some embodiments of the brain signal acquisition system 30, referring to fig. 5, the brain electrical acquisition device 300 further comprises a second right leg drive circuit 307'; the amplifier module 302 is connected to the second reference electrode 30112', the second electroencephalogram electrode 30111', the second right leg driving circuit 307', and the analog-to-digital conversion module 303, respectively, and the second right leg driving circuit 307' is connected to the second reference electrode 30112 'or the second electroencephalogram electrode 30111'.
In some embodiments of the brain signal acquisition system 30, referring to fig. 6, the brain electrical acquisition device 300 further includes a third right leg drive circuit 307", a first resistor 3071", and a second resistor 3072"; the amplifier module 302 is connected to the second reference electrode 30112', the second electroencephalogram electrode 30111', the third right leg driving circuit 307 "and the analog-to-digital conversion module 303, a first resistor 3071" and a second resistor 3072 "are connected in series between the second reference electrode 30112 'and the second electroencephalogram electrode 30111', and the third right leg driving circuit 307" is connected to a connection point of the first resistor 3071 "and the second resistor 3072".
Based on the same inventive concept as the brain signal acquisition system provided in the above embodiment, the embodiment of the present application further provides a brain signal acquisition method applied to the brain signal acquisition system 30, where the brain signal acquisition system includes a plurality of brain electrical acquisition devices; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at the position of the target scalp to acquire electroencephalogram signals corresponding to the position of the target scalp; the power module is used for supplying power to the electroencephalogram acquisition equipment. Fig. 7 is a schematic flow chart of a brain signal acquisition method provided by the application. As shown in fig. 7, the brain signal acquisition method includes:
step S701, detecting a first electroencephalogram signal at a target scalp position; the target scalp position is the position of the scalp surface where the electroencephalogram acquisition equipment is placed.
Step S702, performing signal processing on the first electroencephalogram signal to obtain a second electroencephalogram signal.
Step S703, converting the second electroencephalogram signal into a digital signal, thereby obtaining a target electroencephalogram signal.
Step S704, the target brain electrical signal is sent to the data processing device in a wireless transmission mode, so that the data processing device analyzes the target brain electrical signal.
According to the brain signal acquisition method, any one of a plurality of brain signal acquisition devices included in the brain signal acquisition system is placed at the target scalp position, so that brain signals corresponding to the target scalp position are acquired.
In an optional embodiment, before the target electroencephalogram signal is sent to the data processing apparatus through the wireless transmission mode in step S704, the method further includes: generating a signal sending instruction based on the target brain electrical signal; the signal sending instruction is used for indicating to send the target brain electrical signal in a wireless transmission mode.
In an alternative embodiment, step S701, detecting a first electroencephalogram signal at the target scalp location, see fig. 8, specifically determining the first electroencephalogram signal at the target scalp location by the electroencephalogram electrode 8001 included in the target laplace electrode 301a and the reference electrode 8002 included in the target laplace electrode 301 a; the target laplace electrode 301a is the laplace electrode 301 at the target scalp position; an electroencephalogram electrode 8001 included in the target laplace electrode 301a, and a reference electrode 8002 included in the target laplace electrode 301a are respectively connected to an amplifier module 302 included in the target laplace electrode 301a to form a small loop 801 to acquire an electroencephalogram signal of a target position; the laplace electrode 301 in the brain signal acquisition system 30 includes a plurality of electrode units; the electrode unit includes an electroencephalogram electrode 8001 and a reference electrode 8002.
According to the brain signal acquisition method, a discrete design idea is adopted, the Laplace electrode is a modularized wireless brain electrode, and brain signals are acquired based on the Laplace electrode, as shown in fig. 8, the small loop area between the reference electrode and the brain electrode is far smaller than the large loop area shown in fig. 1 or fig. 2, the brain signal acquisition method is not interfered by a lateral brain area and other interference, and noise artifacts such as a space environment, human body movement or muscles are not easily picked up. The discrete electrode design concept of the brain signal acquisition method can ensure that brain signal acquisition is carried out only on the area where the Laplace electrode is located, is more flexible to use, is convenient for acquiring brain signals in the motion process, and breaks away from the constraint of the traditional wired electrode. Furthermore, the brain signal acquisition method has high spatial resolution, is sensitive to high-frequency brain electricity, is not constrained by a reference and a ground electrode, is convenient to wear, and is suitable for long-time brain electricity monitoring and electroencephalogram monitoring in the movement process.
The embodiment of the application also provides a computer storage medium, wherein the computer storage medium is stored with computer executable instructions for realizing the brain signal acquisition method of any embodiment of the application.
According to one aspect of the present application, there is provided a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the brain signal acquisition method in any one of the above embodiments. The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered.
Claims (5)
1. A brain signal acquisition system, the system comprising:
a plurality of electroencephalogram acquisition apparatuses; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at a target scalp position so as to acquire electroencephalogram signals corresponding to the target scalp position;
the Laplace electrode is used for detecting a first electroencephalogram signal on the surface of the scalp; the amplifier module is used for amplifying the first electroencephalogram signal to obtain a second electroencephalogram signal;
the analog-to-digital conversion module is used for converting the second electroencephalogram signal into a digital signal to obtain an electroencephalogram signal at a target position;
the wireless communication module is used for sending the target position brain electrical signal to a data processing device in a wireless transmission mode so that the data processing device can analyze the target position brain electrical signal;
the power supply module is used for supplying power to the electroencephalogram acquisition equipment;
the laplace electrode comprises a plurality of electrode units; the electrode unit comprises an electroencephalogram electrode and a reference electrode; the electroencephalogram electrode included in the Laplace electrode and the reference electrode included in the Laplace electrode are respectively connected to the amplifier module to form a small loop to acquire the electroencephalogram signal of the target position;
the Laplace electrode comprises 3 first electrode units which are separated by insulating materials; the first electrode unit comprises a first electroencephalogram electrode, a first reference electrode and a right leg driving electrode; the first reference electrode is arranged inside the first electroencephalogram electrode;
the electroencephalogram acquisition equipment further comprises a first right leg driving circuit; the amplifier module is respectively connected with the first reference electrode, the first electroencephalogram electrode, the first right leg driving circuit and the analog-to-digital conversion module, and the first right leg driving circuit is connected with the right leg driving electrode;
the first right leg driving circuit comprises a high-pass filter; and the cut-off frequency of the high-pass filter is smaller than the preset target common-mode signal frequency.
2. The system of claim 1, wherein the electroencephalogram acquisition apparatus further comprises a controller; the controller is respectively connected with the analog-to-digital conversion module and the wireless communication module; the controller is used for controlling the wireless communication module to send the target position brain electrical signal in a wireless transmission mode when receiving the target position brain electrical signal sent by the analog-to-digital conversion module.
3. The brain signal acquisition method is applied to a brain signal acquisition system and is characterized in that the brain signal acquisition system comprises a plurality of brain electrical acquisition devices; the electroencephalogram acquisition equipment comprises a Laplace electrode, an amplifier module, an analog-to-digital conversion module, a wireless communication module and a power supply module; the electroencephalogram acquisition equipment is used for being placed at a target scalp position so as to acquire electroencephalogram signals corresponding to the target scalp position; the power supply module is used for supplying power to the electroencephalogram acquisition equipment;
the method comprises the following steps:
detecting a first electroencephalogram signal at a target scalp location; the target scalp position is the position of the scalp surface placed by the electroencephalogram acquisition equipment;
performing signal processing on the first electroencephalogram signal to obtain a second electroencephalogram signal;
converting the second electroencephalogram signal into a digital signal to obtain an electroencephalogram signal at a target position;
transmitting the target position electroencephalogram signal to a data processing device in a wireless transmission mode so that the data processing device analyzes the target position electroencephalogram signal;
the laplace electrode comprises a plurality of electrode units; the electrode unit comprises an electroencephalogram electrode and a reference electrode; the electroencephalogram electrode included in the Laplace electrode and the reference electrode included in the Laplace electrode are respectively connected to the amplifier module to form a small loop to acquire the electroencephalogram signal of the target position;
the Laplace electrode comprises 3 first electrode units which are separated by insulating materials; the first electrode unit comprises a first electroencephalogram electrode, a first reference electrode and a right leg driving electrode; the first reference electrode is arranged inside the first electroencephalogram electrode;
the electroencephalogram acquisition equipment further comprises a first right leg driving circuit; the amplifier module is respectively connected with the first reference electrode, the first electroencephalogram electrode, the first right leg driving circuit and the analog-to-digital conversion module, and the first right leg driving circuit is connected with the right leg driving electrode;
the first right leg driving circuit comprises a high-pass filter; and the cut-off frequency of the high-pass filter is smaller than the preset target common-mode signal frequency.
4. A method according to claim 3, wherein before said transmitting the target position brain electrical signal to the data processing device via wireless transmission, the method further comprises:
generating a signal sending instruction based on the target position electroencephalogram signal; the signal sending instruction is used for indicating to send the brain electrical signal of the target position in a wireless transmission mode.
5. A computer-readable storage medium having a computer program stored therein, characterized in that: the computer program, when executed by a processor, implements the method of any of claims 3-4.
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