CN113568503A - Communication system based on steady-state visual evoked potential - Google Patents
Communication system based on steady-state visual evoked potential Download PDFInfo
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- 210000004556 brain Anatomy 0.000 claims abstract description 14
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- 210000000869 occipital lobe Anatomy 0.000 claims description 10
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
- G06F3/015—Input arrangements based on nervous system activity detection, e.g. brain waves [EEG] detection, electromyograms [EMG] detection, electrodermal response detection
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Abstract
The invention provides a communication system based on steady-state visual evoked potential, which generates visual stimulation to a user through a light source box, acquires a visual evoked potential signal generated after the human brain is subjected to the visual stimulation through an electroencephalogram acquisition module, processes the visual evoked potential signal to obtain a corresponding electroencephalogram signal frequency component, finds a light source sub-box watched by the user through an information interaction module based on the electroencephalogram signal frequency component to obtain corresponding communication information, and displays the communication information to accompanying personnel through the light source box. The communication system provides a plurality of light source sub-boxes which can be customized, and a user can customize the light source sub-boxes into a plurality of commonly used living intentions according to own requirements, so that the user can express the commonly used living intentions to accompanying personnel quickly, efficiently and accurately only by using electroencephalogram signals through the communication system, and therefore corresponding help can be achieved more quickly, and the living quality of the user is improved.
Description
Technical Field
The invention belongs to the field of computers and life sciences, and particularly relates to a communication system based on steady-state visual evoked potentials.
Background
For the people who are paralyzed and can not produce sound due to accidental injury or diseases, the intention of the people cannot be shown to accompanying personnel in daily life, so that the life quality is greatly reduced, and serious burden is brought to the society and families.
The brain-computer interface technology can decode the current brain state by analyzing the electrical activity signals of the brain so as to control external equipment, and the mode can provide a mode for communicating with the outside for people with body paralysis and no speaking but with healthy brain.
At present, a plurality of inventions based on brain-computer interfaces are used for improving the quality of life of the people, such as an intelligent wheelchair system based on SSVEP (patent number CN201310163499.3) which uses the brain-computer interface technology to help paralyzed people to control wheelchairs; the patent "a double-spelling Chinese input system based on steady state visual evoked potential" (patent number CN201710033253.2) applies brain-computer interface technology to input characters. The current method is not enough for the communication between the paralyzed population and the accompanying person. What is important is that paralyzed people need to express their common life intentions rapidly and efficiently under specific conditions, such as specific needs of "drinking water", body state "uncomfortable", expression of emotion "happy", even expression of "do not disturb" when they need a privacy space, and the like, and the intentions are inefficient by typing and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a communication system based on steady-state visual evoked potential, which adopts the following technical scheme:
the invention provides a communication system based on steady-state visual evoked potential, which can realize quick communication between a user and an attendant based on an electroencephalogram signal, and is characterized by comprising the following steps: the brain electrical acquisition module is used for acquiring and processing a steady-state visual evoked potential signal generated after the human brain receives visual stimulation; the information interaction module is used for generating visual stimulation, displaying communication information and carrying out face recognition and is in communication connection with the electroencephalogram acquisition module, wherein the electroencephalogram acquisition module comprises an electrode head and a signal processing circuit, the information interaction module comprises a light source box, a camera and a control circuit, the control circuit controls the light source box to generate the visual stimulation to a user, and the electrode head acquires a steady-state visual evoked potential signal of the user; the signal processing circuit processes the steady-state visual evoked potential signals to obtain corresponding electroencephalogram signal frequency components, and the control circuit controls the light source box to display communication information based on the electroencephalogram signal frequency components to be confirmed by accompanying personnel.
The communication system based on the steady-state visual evoked potential provided by the invention can also have the technical characteristics that the electrode head-mounted device comprises: the two frontal lobe electrodes are positioned in front and used for collecting frontal lobe electroencephalogram signals; two occipital lobe electrodes positioned at the rear part and used for collecting occipital lobe electroencephalogram signals; and the steady-state visual evoked potential signals comprise frontal lobe electroencephalogram signals and occipital lobe electroencephalogram signals.
The communication system based on the steady-state visual evoked potential provided by the invention can also have the technical characteristics that the light source box comprises a plurality of light source sub-boxes, the plurality of light source sub-boxes comprise a starting light source sub-box, a stopping light source sub-box and at least one self-defined light source sub-box, the light source sub-boxes are provided with LED lamps and cover plates, and when the light source sub-boxes are in a stimulation working mode, the LED lamps flicker to generate visual stimulation; when the light source sub-box is in a communication working mode, the LED lamp is normally on and used for indicating communication information; when the light source sub-box is in the stop working mode, the LED lamp is turned off, and the cover plate is used for defining communication information.
The communication system based on the steady-state visual evoked potential provided by the invention can also have the technical characteristics that when the plurality of user-defined light source sub-boxes enter the stimulation working mode, the LED lamps of the plurality of user-defined light source sub-boxes flicker at different frequencies.
The communication system based on the steady-state visual evoked potential provided by the invention can also have the technical characteristics that the information interaction module carries out face recognition through the camera, and when the information interaction module recognizes a face and the eyes of a user are over against the camera, the information interaction module sets the starting light source sub-box into a stimulation working mode through the control circuit.
The communication system based on the steady-state visual evoked potential provided by the invention can also have the technical characteristics that: the starting button is used for setting all the self-defined light source sub-boxes and the light source stopping sub-boxes to be in a stimulation working mode; and the accompanying terminal is held by an accompanying person and used for receiving communication information, the accompanying terminal is in communication connection with the signal interaction module, the communication information at least comprises starting information, and when the accompanying person receives the starting information, the accompanying person presses a starting button.
The communication system based on the steady-state visual evoked potential can also have the technical characteristics that when the light source sub-box enters the stimulation working mode for 2 seconds, the electroencephalogram acquisition module acquires a steady-state visual evoked potential signal and obtains a corresponding electroencephalogram signal frequency component, the information interaction module carries out corresponding operation based on the electroencephalogram signal frequency component, and when the electroencephalogram signal frequency component corresponds to the starting light source sub-box, the information interaction module sends starting information to the accompanying terminal; when the EEG signal frequency component corresponds to the termination light source sub-box, the control circuit sets all the self-defined light source sub-boxes to be in a stop working mode; when the EEG signal frequency component corresponds to a user-defined light source sub-box, the control circuit sets the user-defined light source sub-box into a communication working mode and sets other light source sub-boxes into a stop working mode, and after 5 seconds, the control circuit sets all the user-defined light source sub-boxes into a stimulation working mode.
The communication system based on the steady-state visual evoked potential also has the technical characteristics that the electroencephalogram acquisition module is in communication connection with the information interaction module through Bluetooth.
Action and Effect of the invention
According to the communication system based on the steady-state visual evoked potential, the light source box generates visual stimulation to a user, the electroencephalogram acquisition module acquires a visual evoked potential signal generated after the human brain is subjected to the visual stimulation and processes the visual evoked potential signal to obtain a corresponding electroencephalogram signal frequency component, the information interaction module finds the light source sub-box watched by the user based on the electroencephalogram signal frequency component to obtain corresponding communication information, and the communication information is displayed to accompanying personnel through the light source box. The user only needs to watch one light source sub-box for 2 seconds, and corresponding communication information can be transmitted to accompanying personnel. And this communication system provides a plurality of light source subboxes that can be customized, and the user can be according to the demand of oneself, becomes a plurality of living intentions of using always with it by the custom, consequently, through this communication system, the user can only use electroencephalogram signal to express its living intentions of using always to accompanying and attending personnel fast high-efficiently and accurately to can reach corresponding help more fast, improve user's quality of life.
Drawings
FIG. 1 is a schematic diagram of a communication system based on steady-state visual evoked potentials according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electroencephalogram acquisition module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an information interaction module according to an embodiment of the invention;
FIG. 4 is a schematic diagram of an operation process of a communication system based on steady-state visual evoked potentials according to an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement objects and the effects of the present invention easy to understand, the communication system based on the steady-state visual evoked potential of the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
< example >
In this embodiment, the user of the communication system based on the steady-state visual evoked potential is a paralyzed patient, the accompanying terminal is a mobile phone of an attendant, and the paralyzed patient can communicate with the attendant quickly through the communication system, which is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic view of a communication system based on steady-state visual evoked potentials according to an embodiment of the present invention.
As shown in fig. 1, a communication system (hereinafter referred to as a communication system) 100 based on steady-state visual evoked potentials according to an embodiment of the present invention includes an electroencephalogram acquisition module 12 and an information interaction module 13, which are wirelessly connected via bluetooth.
FIG. 2 is a schematic diagram of an electroencephalogram acquisition module according to an embodiment of the present invention;
as shown in fig. 1 and 2, the brain electrical acquisition module 12 includes an electrode headset 21 and a signal processing circuit 22.
Electrode head wears 21 and is the ring shape that elastic material made, has two sections and to be the elasticity strap that the magic was pasted, in this embodiment, only gathers occipital lobe signal, and two occipital lobe electrodes 201a, 201b are made at the rear inboard of wearing, and 1 centimetre is kept away from with the magic subsides, and reference electrode 202 is connected in the right side middle part of electrode head wears 21. After the paralyzed patient wears the electrode head 21, the occipital lobe electrodes 201a and 201b are attached to the occipital lobe positions of the hindbrain of the patient, and the reference electrode 202 is connected to the right ear.
The electrode head 21 is used for acquiring steady state visual evoked potential signals generated after the paralyzed patient brain receives visual stimulation.
The signal processing circuit 22 is attached to the left middle portion of the electrode head 21 by means of a hook and loop fastener. The signal processing circuit 22 is configured to process the acquired steady-state visual evoked potential signal, and obtain an electroencephalogram signal frequency component corresponding to the stimulation frequency after signal processing.
Fig. 3 is a schematic diagram of an information interaction module according to an embodiment of the present invention.
As shown in fig. 3, the information interaction module 13 includes a light source box 31, a camera 32, and a control circuit 33.
The light source box 31 includes a box body 301, a cover plate 302 and a start button 303, the box body includes 18 light source sub-boxes, 16 of which are custom light source sub-boxes 311, and the sizes of the light source sub-boxes are the same, and the two light source sub-boxes in the middle are a start light source sub-box 312 and a stop light source sub-box 313, and the sizes of the two light source sub-boxes are 2 times of the custom light source sub-box 311. Each light source sub-box contains an LED lamp, which is controlled by a control circuit 33. The cover plate 302 is made of transparent acrylic material, the cover plate parts corresponding to the starting light source sub-box 312 and the terminating light source sub-box 313 have defined specific functions, and besides, the cover plate parts 321 corresponding to the other customized light source sub-boxes 311 can be written and erased by using a mark pen for defining information which may be used by paralyzed patients under different situations. In this embodiment, the customized light source sub-box 311a is defined as "needing drinking" and corresponding characters are written on the cover plate portion 321a corresponding to the customized light source sub-box 311a by a mark pen.
The light source box 31 includes three operation modes, a standby mode, a stimulation mode and a communication mode.
When the standby mode is entered, the LED lamps of the light source sub-box 312 are turned on to flash for generating visual stimulation and inducing electroencephalogram, and the LED lamps of the other light source sub-boxes are turned off.
When the stimulation mode is entered, the LED lamps of all the light source sub-boxes flash at different frequencies for generating visual stimulation and inducing electroencephalogram.
When the paralyzed patient enters the communication mode, the LED lamp of only one light source sub-box is always on for indicating the information selected by the paralyzed patient, and the LED lamps of other light source sub-boxes are turned off.
The camera 32 is located right above the light source box 31 and used for face recognition detection.
The control circuit 33 is used for controlling the light source box 31 to generate visual stimulation to the paralyzed patient and induce electroencephalogram, or to display communication information to accompanying personnel.
FIG. 4 is a schematic diagram of an operation process of a communication system based on steady-state visual evoked potentials according to an embodiment of the present invention.
As shown in fig. 1 and fig. 4, the communication system based on the steady-state visual evoked potential of the present embodiment operates according to the following process:
in step S1, after the communication system 100 starts operating, the camera 32 performs face recognition detection every 5 seconds, determines whether the face recognition detection is successful, recognizes the specified paralyzed patient and detects that the eyes of the specified paralyzed patient are directly facing the camera 32. When the judgment is negative, namely the identification detection fails, repeating the step 1;
step S2, when the recognition detection is successful, the control circuit 33 in the information interaction module 13 sets the light source box 31 to the standby mode, at this time, the LED lamp of the light source sub-box 312 is turned on to flash at a specific frequency;
step S3, when the light source box 31 enters the standby mode for 2 seconds, that is, after the LED lamp of the starting light source sub-box 312 flashes for 2 seconds, the electroencephalogram acquisition module 12 acquires the steady-state visual evoked potential signal of the paralyzed patient, and the signal processing circuit 22 processes the signal to obtain the corresponding electroencephalogram frequency component, the signal processing circuit 22 further identifies the electroencephalogram frequency component, determines whether the electroencephalogram frequency component is the frequency corresponding to the starting light source sub-box 312, and if the electroencephalogram frequency component is determined not to be the frequency corresponding to the starting light source sub-box 312, the step S1 is returned to;
step S4, when the frequency corresponding to the starting light source sub-box 312 is identified, the signal processing circuit 22 sends an instruction to the control circuit 33 through bluetooth, and sends the starting information to the mobile phone of the attendant, and the attendant manually presses the starting button 303 after receiving the starting information;
step S5, the control circuit 33 sets the light source box 31 to the stimulation mode, i.e. the LED lights of all light source sub-boxes flash at different frequencies;
step S6, when the light source box 31 enters the stimulation mode for 2 seconds, the electroencephalogram acquisition module 12 acquires the steady-state visual evoked potential signal of the paralyzed patient, the signal processing circuit 22 processes the signal to obtain the corresponding frequency component of the electroencephalogram signal, the signal processing circuit 22 further identifies the frequency component of the electroencephalogram signal to find the light source sub-box specified by the paralyzed patient, the control circuit 33 sets the light source box 31 to the communication mode, that is, the LED lamp of the light source sub-box specified by the paralyzed patient is normally on for 5 seconds, the LED lamps of the other light source sub-boxes are off, and the accompanying person obtains the information of the communication by observing the light source box.
For example, in this embodiment, in the stimulation mode, after the paralyzed patient gazes at the custom light source sub-box 311a for 2 seconds, the light source box 31 enters the communication mode, the LED lamp of the custom light source sub-box 311a is usually turned on for 5 seconds, and the accompanying person observes the lighting condition, and combines the text information on the corresponding cover plate portion 321a to obtain the communication information "needing to drink water" this time.
Step S7, determining whether the light source sub-box designated by the paralyzed patient is the light source termination sub-box, if not, returning to step S6 to start a new round of communication, and if yes, terminating the operation of the communication system 100.
Examples effects and effects
According to the communication system based on the steady-state visual evoked potential provided by the embodiment, the light source box generates visual stimulation to a user, the electroencephalogram acquisition module acquires a visual evoked potential signal generated after the human brain is subjected to the visual stimulation and processes the visual evoked potential signal to obtain a corresponding electroencephalogram signal frequency component, the information interaction module finds the light source sub-box watched by the user based on the electroencephalogram signal frequency component to obtain corresponding communication information, and the communication information is displayed to accompanying personnel through the light source box. The user only needs to watch one light source sub-box for 2 seconds, and corresponding communication information can be transmitted to accompanying personnel. And this communication system provides a plurality of light source subboxes that can be customized, and the user can be according to the demand of oneself, becomes a plurality of living intentions of using always with it by the custom, consequently, through this communication system, the user can only use electroencephalogram signal to express its living intentions of using always to accompanying and attending personnel fast high-efficiently and accurately to can reach corresponding help more fast, improve user's quality of life.
The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.
For example, in the above embodiment, the cover plate is made of a transparent acrylic material, and a mark pen is used for writing and erasing customized information on the cover plate.
In the above embodiment, the number of the custom light source sub-boxes is 16, in other aspects of the present invention, fewer or more custom light source sub-boxes may also be used, and the technical effects of the present invention can also be achieved.
In the above embodiment, the accompanying terminal is a mobile phone of an accompanying person, and in other aspects of the present invention, other terminal devices, such as a pager, may also be used to achieve the technical effects of the present invention.
In the above embodiment, the electroencephalogram acquisition module and the information interaction module are connected through bluetooth communication, and in other schemes of the present invention, other communication connection modes may also be used, and the technical effects of the present invention may also be achieved.
Claims (8)
1. The utility model provides a communication system based on steady state visual evoked potential, can realize user and attendant's quick communication based on brain electrical signal, its characterized in that includes:
the brain electrical acquisition module is used for acquiring and processing a steady-state visual evoked potential signal generated after the human brain receives visual stimulation; and
an information interaction module used for generating the visual stimulation, displaying the communication information and carrying out the face recognition and connected with the brain electricity acquisition module in a communication way,
wherein, the electroencephalogram acquisition module comprises an electrode head and a signal processing circuit,
the information interaction module comprises a light source box, a camera and a control circuit,
the control circuit controls the light source box to generate the visual stimulus to the user,
the electrode head-mounted collects steady state visual evoked potential signals of the user;
the signal processing circuit processes the steady-state visual evoked potential signal to obtain a corresponding electroencephalogram signal frequency component,
the control circuit controls the light source box to display the communication information based on the EEG signal frequency components to be confirmed by the accompanying person.
2. The steady-state visual evoked potential-based communication system as in claim 1, wherein:
wherein the electrode headset comprises:
the two frontal lobe electrodes are positioned in front and used for collecting frontal lobe electroencephalogram signals;
two occipital lobe electrodes positioned at the rear part and used for collecting occipital lobe electroencephalogram signals; and
a reference electrode is provided on the substrate,
the steady state visual evoked potential signal comprises the frontal lobe electroencephalogram signal and the occipital lobe electroencephalogram signal.
3. The steady-state visual evoked potential-based communication system as in claim 1, wherein:
wherein the light source box comprises a plurality of light source sub-boxes, a cover plate and an activation button,
the plurality of light source sub-boxes comprise a starting light source sub-box, a stopping light source sub-box and at least one custom light source sub-box,
the light source sub-box has an LED lamp, the visual stimulus is generated by the LED lamp flashing,
when the light source box is in a standby mode, the LED lamps of the starting light source sub-box flicker, and the LED lamps of other light source sub-boxes are turned off;
when the light source boxes are in a stimulation mode, the LED lamps of all the light source sub-boxes flash;
when the light source box is in a communication mode, the LED lamp of the light source sub-box designated by the user is normally on for indicating the communication information, the LED lamps of other light source sub-boxes are turned off,
the cover plate is used for defining the communication information,
the starting button is used for starting the light source box to enable the light source box to enter the stimulation mode.
4. The steady-state visual evoked potential-based communication system as in claim 3, wherein:
wherein when the light source box is in a stimulation mode, the plurality of LED lights of the plurality of light source sub-boxes flash at different frequencies.
5. The steady-state visual evoked potential-based communication system of claim 4, wherein:
wherein the information interaction module carries out the face recognition through the camera,
when the information interaction module identifies a human face and eyes of the user are opposite to the camera, the control circuit sets the light source box to be in the standby mode.
6. The steady-state visual evoked potential-based communication system of claim 5, further comprising:
the accompanying terminal is held by the accompanying person and used for receiving the communication information, the accompanying terminal is in communication connection with the signal interaction module,
the communication information at least comprises starting information,
and when the accompanying person receives the starting information, the accompanying person presses the starting button.
7. The steady-state visual evoked potential-based communication system of claim 6, wherein:
wherein, after the light source box enters the stimulation mode for 2 seconds, the electroencephalogram acquisition module acquires the steady-state visual evoked potential signals and obtains the corresponding frequency components of the electroencephalogram signals, the information interaction module carries out corresponding operation based on the frequency components of the electroencephalogram signals,
when the EEG signal frequency components correspond to the starting light source sub-box, the information interaction module sends the starting information to the accompanying terminal;
when the EEG signal frequency component corresponds to the termination light source sub-box, the communication system based on the steady-state visual evoked potential terminates the operation;
when the EEG signal frequency component corresponds to one user-defined light source sub-box, the user-defined light source sub-box is the light source sub-box appointed by the user, the control circuit sets the light source box to be in the communication mode, and after 5 seconds, the control circuit sets the light source box to be in the stimulation mode.
8. The communication system according to claim 1, wherein the communication system further comprises:
the electroencephalogram acquisition module is in communication connection with the information interaction module through Bluetooth.
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