阅读说明：本技术 一种脑电信号采集系统及其控制方法 (Electroencephalogram signal acquisition system and control method thereof ) 是由 贺庆 张云 刘博� 于 2019-08-19 设计创作，主要内容包括：本发明实施例提供的一种脑电信号采集系统及其控制方法,该脑电信号采集系统,包括：脑电极连接端口,用于与脑电极连接,接收脑电极获取的脑电信号；模拟信号处理通道,其接收端与所述脑电极连接端口连接,用于将所述脑电极连接端口接收到的脑电信号进行预处理,得到脑电输出信号；控制器,其输入端与所述模拟信号处理通道的输出端连接,用于接收所述模拟信号处理通道输出的脑电输出信号；5G通信模块,与所述控制器连接,用于与外界设备通信连接；所述控制器通过所述5G通信模块将所述模拟信号处理通道输出的脑电输出信号传输到外界设备,制成能够在实际生活中进行应用的脑电信号采集系统,便于使用者携带,能够适应更多的应用场合。(The embodiment of the invention provides an electroencephalogram signal acquisition system and a control method thereof, wherein the electroencephalogram signal acquisition system comprises: the brain electrode connecting port is used for being connected with a brain electrode and receiving an electroencephalogram signal acquired by the brain electrode; the receiving end of the analog signal processing channel is connected with the brain electrode connecting port and is used for preprocessing the electroencephalogram signals received by the brain electrode connecting port to obtain electroencephalogram output signals; the input end of the controller is connected with the output end of the analog signal processing channel and is used for receiving the electroencephalogram output signal output by the analog signal processing channel; the 5G communication module is connected with the controller and is used for being in communication connection with external equipment; the controller transmits the EEG output signal output by the analog signal processing channel to external equipment through the 5G communication module to form an EEG signal acquisition system which can be applied in actual life, is convenient for a user to carry and can adapt to more application occasions.)

1. An electroencephalogram signal acquisition system, characterized by comprising:

the brain electrode connecting port is used for being connected with a brain electrode and receiving an electroencephalogram signal acquired by the brain electrode;

the receiving end of the analog signal processing channel is connected with the brain electrode connecting port and is used for preprocessing the electroencephalogram signals received by the brain electrode connecting port to obtain electroencephalogram output signals;

the input end of the controller is connected with the output end of the analog signal processing channel and is used for receiving the electroencephalogram output signal output by the analog signal processing channel;

the 5G communication module is connected with the controller and is used for being in communication connection with external equipment;

and the controller transmits the electroencephalogram output signal output by the analog signal processing channel to external equipment through the 5G communication module.

2. The electroencephalogram signal acquisition system of claim 1,

the analog signal processing channel comprises: a signal amplitude control module;

the input end of the signal amplitude control module is connected with the brain electrode connecting port;

the control end of the signal amplitude control module is connected with the controller;

and the signal amplitude control module is used for carrying out amplitude adjustment on the received electroencephalogram signal to obtain an electroencephalogram amplitude adjustment signal.

3. The electroencephalogram signal acquisition system of claim 2,

the analog signal processing channel further comprises: the filter is connected with the output end of the signal amplitude control module;

and the filter is used for filtering interference signals in the electroencephalogram amplitude adjusting signals.

4. The electroencephalogram signal acquisition system of claim 2,

the signal amplitude control module comprises: the first-stage amplifying circuit, the second-stage amplifying circuit and the third-stage amplifying circuit are connected in series;

the first-stage amplifier is an isolation amplifier and is used for electrically isolating front and rear-stage signals so as to prevent the current of a rear-stage circuit of the system from flowing back into a brain electrode and influencing measurement or user safety;

the second-stage amplifier is a low-noise fixed gain amplifier and is used for pre-amplifying the electroencephalogram signals;

the third stage amplifier is a controllable gain amplifier; the gain controlled end of the controllable gain amplifier is connected with the controller so as to controllably amplify the electroencephalogram signals.

5. The electroencephalogram signal acquisition system of claim 4,

the controllable gain amplifier is a voltage-controlled amplifier; the gain controlled end of the voltage-controlled amplifier is connected with the controller through a digital-to-analog converter (DAC) so as to controllably amplify the electroencephalogram signals;

or, the controllable gain amplifier is PGA; and the control end of the PGA is connected with the controller.

6. The electroencephalogram signal acquisition system of claim 3,

the analog signal processing channel further comprises: a signal sampling module;

the signal sampling module is an analog-digital converter (ADC); and the control end of the analog-digital converter ADC is connected with the controller and used for converting the electroencephalogram amplitude adjusting signal into a digital signal under the control of the controller, and the digital signal is used as an electroencephalogram output signal so as to be output to the controller for processing.

7. The electroencephalogram signal acquisition system of claim 1,

the controller is connected with a memory;

the memory includes: a buffer, a data storage medium;

the buffer is a non-permanent memory storage, is arranged between the signal sampling module and the controller and is used for buffering the digital signal output by the signal sampling module for the controller to use;

the data storage medium is a permanent memory storage and is used for storing the digital signals output by the signal sampling module.

8. The electroencephalogram signal acquisition system of claim 1,

the controller includes: ARM chip, or FPGA chip, or DSP chip.

9. The brain electrical signal acquisition system according to any one of claims 1 to 8,

the 5G communication module is in communication connection with external equipment with a 5G transceiver module;

the outside plant includes: the network cloud equipment is connected into the 5G network and/or the electroencephalogram signal processing computer is connected into the 5G network;

the network cloud equipment is used for instantly storing the electroencephalogram output signals;

and the electroencephalogram signal processing computer is used for carrying out instant processing on the electroencephalogram output signal.

10. An electroencephalogram signal acquisition system control method applied to the electroencephalogram signal acquisition system according to any one of claims 1 to 9, characterized by comprising:

receiving an electroencephalogram output signal output by the analog signal processing channel;

and transmitting the electroencephalogram output signal output by the analog signal processing channel to external equipment.

Technical Field

The embodiment of the invention relates to the technical field of electroencephalogram detection, in particular to an electroencephalogram signal acquisition system and a control method thereof.

Background

The brain-computer interface is one of the current research hotspots. It is widely used in scientific research, military, medical treatment, life assistance and other aspects. In 2016, there will be a wide space for development in the future for "brain science and brain-like research". Among the many related technologies of brain-computer interfaces, electroencephalogram signal acquisition is a key and fundamental item. The electrical signal sensed by the brain electrode is captured and collected, converted into a digital format and transmitted to the subsequent stage for data processing, so that the quality of the brain electrical signal collection determines the performance of the brain-computer interface. Most of the existing electroencephalogram signal acquisition systems adopt wired signal transmission and can only be applied to certain medical and experimental places.

Therefore, how to provide an electroencephalogram signal acquisition system which can adapt to more application occasions is a technical problem to be solved urgently by technical personnel in the field.

Disclosure of Invention

Therefore, the embodiment of the invention provides an electroencephalogram signal acquisition system and a control method thereof, which can be suitable for more application occasions.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

in one aspect, an embodiment of the present invention provides an electroencephalogram signal acquisition system, including:

the brain electrode connecting port is used for being connected with a brain electrode and receiving an electroencephalogram signal acquired by the brain electrode;

the receiving end of the analog signal processing channel is connected with the brain electrode connecting port and is used for preprocessing the electroencephalogram signals received by the brain electrode connecting port to obtain electroencephalogram output signals;

the input end of the controller is connected with the output end of the analog signal processing channel and is used for receiving the electroencephalogram output signal output by the analog signal processing channel;

the 5G communication module is connected with the controller and is used for being in communication connection with external equipment;

and the controller transmits the electroencephalogram output signal output by the analog signal processing channel to external equipment through the 5G communication module.

Preferably, the analog signal processing channel includes: a signal amplitude control module;

the input end of the signal amplitude control module is connected with the brain electrode connecting port;

the control end of the signal amplitude control module is connected with the controller;

and the signal amplitude control module is used for carrying out amplitude adjustment on the received electroencephalogram signal to obtain an electroencephalogram amplitude adjustment signal.

Preferably, the analog signal processing channel further includes: the filter is connected with the output end of the signal amplitude control module;

and the filter is used for filtering interference signals in the electroencephalogram amplitude adjusting signals.

Preferably, the signal amplitude control module includes: the first-stage amplifying circuit, the second-stage amplifying circuit and the third-stage amplifying circuit are connected in series;

the first-stage amplifier is an isolation amplifier and is used for electrically isolating front and rear-stage signals so as to prevent the current of a rear-stage circuit of the system from flowing back into a brain electrode and influencing measurement or user safety;

the second-stage amplifier is a low-noise fixed gain amplifier and is used for pre-amplifying the electroencephalogram signals;

the third stage amplifier is a controllable gain amplifier; the gain controlled end of the controllable gain amplifier is connected with the controller so as to controllably amplify the electroencephalogram signals.

Preferably, the controllable gain amplifier is a voltage controlled amplifier; the gain controlled end of the voltage-controlled amplifier is connected with the controller through a digital-to-analog converter (DAC) so as to controllably amplify the electroencephalogram signals;

or, the controllable gain amplifier is PGA; and the control end of the PGA is connected with the controller.

Preferably, the analog signal processing channel further includes: a signal sampling module;

the signal sampling module is an analog-digital converter (ADC); and the control end of the analog-digital converter ADC is connected with the controller and used for converting the electroencephalogram amplitude adjusting signal into a digital signal under the control of the controller, and the digital signal is used as an electroencephalogram output signal so as to be output to the controller for processing.

Preferably, the controller is connected with a memory;

the memory includes: a buffer, a data storage medium;

the buffer is a non-permanent memory storage, is arranged between the signal sampling module and the controller and is used for buffering the digital signal output by the signal sampling module for the controller to use;

the data storage medium is a permanent memory storage and is used for storing the digital signals output by the signal sampling module.

Preferably, the controller includes: ARM chip, or FPGA chip, or DSP chip.

Preferably, the 5G communication module is in communication connection with an external device with a 5G transceiver module;

the outside plant includes: the network cloud equipment is connected into the 5G network and/or the electroencephalogram signal processing computer is connected into the 5G network;

the network cloud equipment is used for instantly storing the electroencephalogram output signals;

and the electroencephalogram signal processing computer is used for carrying out instant processing on the electroencephalogram output signal.

On the other hand, an embodiment of the present invention provides a method for controlling an electroencephalogram signal acquisition system, which is applied to any one of the above electroencephalogram signal acquisition systems, and includes:

receiving an electroencephalogram output signal output by the analog signal processing channel;

and transmitting the electroencephalogram output signal output by the analog signal processing channel to external equipment.

The embodiment of the invention provides an electroencephalogram signal acquisition system, which comprises: the brain electrode connecting port is used for being connected with a brain electrode and receiving an electroencephalogram signal acquired by the brain electrode; the receiving end of the analog signal processing channel is connected with the brain electrode connecting port and is used for preprocessing the electroencephalogram signals received by the brain electrode connecting port to obtain electroencephalogram output signals; the input end of the controller is connected with the output end of the analog signal processing channel and is used for receiving the electroencephalogram output signal output by the analog signal processing channel; the 5G communication module is connected with the controller and is used for being in communication connection with external equipment; and the controller transmits the electroencephalogram output signal output by the analog signal processing channel to external equipment through the 5G communication module. The inventor of the application finds that some electroencephalogram signals can be accurately measured only by measuring the electroencephalogram signals in actual life, and the acquisition accuracy of the electroencephalogram signals is limited by the existing electroencephalogram signal acquisition equipment in the prior art. The inventor of the application can carry out the acquisition of EEG signal in people's actual life in order to make EEG signal's measuration more accurate, therefore utilizes 5G communication module, makes the EEG signal collection system that can carry out the application in actual life, and convenient to use person carries, can adapt to more application occasions.

The electroencephalogram signal acquisition system and the control method thereof provided by the embodiment of the invention have the same beneficial effects, and are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a schematic structural diagram of a component of an electroencephalogram signal acquisition system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a signal amplitude control module of an electroencephalogram signal acquisition system according to an embodiment of the present invention;

FIG. 3 is a schematic control diagram of a three-stage amplifying circuit of an electroencephalogram signal acquisition system according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating interaction between an electroencephalogram signal acquisition system and an external device according to an embodiment of the present invention;

fig. 5 is a flowchart of a method for controlling an electroencephalogram signal acquisition system according to an embodiment of the present invention.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic structural diagram of an electroencephalogram signal acquisition system according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a signal amplitude control module of an electroencephalogram signal acquisition system according to an embodiment of the present invention; FIG. 3 is a schematic control diagram of a three-stage amplifying circuit of an electroencephalogram signal acquisition system according to an embodiment of the present invention; fig. 4 is a schematic diagram illustrating interaction between an electroencephalogram signal acquisition system and an external device according to a specific embodiment of the present invention.

The embodiment of the invention provides an electroencephalogram signal acquisition system, which comprises: the brain electrode connecting port 110 is used for connecting with a brain electrode and receiving brain electrical signals acquired by the brain electrode; the receiving end of the analog signal processing channel 120 is connected to the brain electrode connecting port 110, and is configured to pre-process the electroencephalogram signal received by the brain electrode connecting port 110 to obtain an electroencephalogram output signal; a controller 130, the input end of which is connected with the output end of the analog signal processing channel 120, and is used for receiving the electroencephalogram output signal output by the analog signal processing channel 120; the 5G communication module 140 is connected to the controller 130, and is configured to be in communication connection with an external device; the controller 130 transmits the electroencephalogram output signal output by the analog signal processing channel 120 to an external device through the 5G communication module 140.

The brain electrode connection port 110 is responsible for feeding the measurement electrode, reference electrode or ground electrode signals worn by the user into the analog receiving channel of the brain electrical signal acquisition system. Optionally, the brain electrode connection port 110 may specifically include a dry electrode and/or a wet electrode, a brain electrode feed line, and an electrical interface (e.g., a BNC interface).

Further, since the electroencephalogram signal collected by the electroencephalogram electrode connection port 110 is weak, in order to perform subsequent processing, the electroencephalogram signal may be increased, and specifically, in the analog signal processing channel 120, the following may be set: a signal amplitude control module 121; the input end of the signal amplitude control module is connected with the brain electrode connecting port 110; the control end of the signal amplitude control module is connected with the controller 130; and the signal amplitude control module is used for carrying out amplitude adjustment on the received electroencephalogram signal to obtain an electroencephalogram amplitude adjustment signal. In order to filter the interference signal, in the analog signal processing channel 120, there may be further provided: a filter 122 connected to an output of the signal amplitude control module; and the filter is used for filtering interference signals in the electroencephalogram amplitude adjusting signals.

Specifically, the signal amplitude control module 121 may include: a first-stage amplification circuit 1211, a second-stage amplification circuit 1212, and a third-stage amplification circuit 1213 connected in series; the first stage amplifier 1211 is an isolation amplifier, and is used for electrically isolating signals of the front stage and the rear stage so as to prevent current of a rear stage circuit of the system from flowing back to a brain electrode and causing influence on measurement or user safety; the second-stage amplifier 1212 is a low-noise fixed-gain amplifier, and is used for pre-amplifying the electroencephalogram signal; the third stage amplifier 1213 is a controllable gain amplifier; the gain controlled end of the controllable gain amplifier is connected with the controller 130 to controllably amplify the electroencephalogram signal. The controllable gain amplifier is a voltage-controlled amplifier; the gain controlled end of the voltage controlled amplifier is connected with the controller 130 through a digital-to-analog converter DAC1214 to controllably amplify the electroencephalogram signal.

Of course, other embodiments may be adopted, for example, the controllable gain amplifier may be set as a PGA, a control terminal of the PGA is connected to the controller, and a Programmable Gain Amplifier (PGA). The amplifier is a highly versatile amplifier, and the amplification factor of the amplifier can be controlled by a program as required. By adopting the amplifier, the full-scale signal of the A/D converter can be homogenized by adjusting the amplification factor through a program, thereby greatly improving the measurement precision. The range-controllable conversion is to perform controllable adjustment of multiple of the processed signal by using a programmable gain amplifier according to the requirement so as to meet the requirements of subsequent circuits and systems. Specifically, a combined PGA or an integrated PGA may be employed; the combined PGA typically consists of an operational amplifier, instrumentation amplifier or isolated discharger, plus some other additional circuitry. The working principle is that the numerical value of the feedback resistor which is switched on by the multi-way change-over switch is adjusted through a program, so that the amplification factor of the amplifier is adjusted. Various types of integrated PGA circuits, such as MCP6S21, MCP6S22, MCP6S26, MCP6S28 series manufactured by Microchip corporation, and AD8321 manufactured by Analog Devices, inc.

In another embodiment, the controllable gain amplifier may be implemented by a voltage controlled gain amplifier (VGA), a digital-to-analog converter (DAC), and a reference voltage source. The voltage-controlled amplifier can flexibly change the amplification gain according to the voltage of the control signal. The digital-to-analog converter DAC is electrically connected to the third stage amplifier 1213, the reference voltage source and the controller 130, and is used for generating an appropriate output voltage under the control of the controller 130 to control the voltage-controlled amplifier to change the amplification gain. The reference voltage source raises the reference voltage for the DAC.

It is worth mentioning that, in order to facilitate the transmission of the electroencephalogram signal, the electroencephalogram signal can be converted from an analog signal to a digital signal, and specifically, in the analog signal processing channel 120, the following may be set: a signal sampling module; the signal sampling module is an analog-digital converter (ADC); the control end of the analog-to-digital converter ADC is connected to the controller 130, and is configured to convert the electroencephalogram amplitude adjustment signal into a digital signal under the control of the controller 130, and the digital signal is used as an electroencephalogram output signal to be output to the controller 130 for processing. Specifically, in specific implementation, the signal acquisition module specifically includes: a high-precision Analog-to-digital converter (ADC) and a buffer; the high-precision analog-digital converter is used for converting the amplified signal output by the third-stage amplifier 1213 into a digital signal; the buffer is used for buffering the digital signal and inputting the digital signal to the controller 130. Of course, the analog-to-digital converter ADC specifically needs to perform high-precision AD conversion on the analog signal under the control of the controller 130.

The analog-to-digital converted signal is output to the controller 130, and the controller 130 buffers the data into the memory 150. Then the signals are transmitted to a computer or a remote controller which is also connected with the 5G wireless transceiver module at a high speed according to a certain queue sequence through the 5G wireless transceiver module, the computer or the remote controller runs upper computer software and corresponding algorithms, electroencephalogram signals are analyzed, and electroencephalograms are drawn or corresponding control operations are executed. In one embodiment, the controller 130 can be implemented by an ARM chip, an FPGA chip, a DSP chip, or the like.

In fact, after the system is started, the upper computer may write default parameters into corresponding register locations in the controller 130 to initialize the brain electrical acquisition system. And then parameters of the amplitude control module and the analog-to-digital conversion module can be automatically or manually adjusted by a user according to the application requirement, and the acquired data is transmitted back to the upper computer.

On the basis of the foregoing specific embodiment, in this specific embodiment, in order to prevent the controller 130 or an external device from processing the electroencephalogram signal data in a timely manner and causing data loss, the controller 130 may be connected to a memory 150; the memory 150 includes: a buffer, a data storage medium; the buffer is a non-permanent memory, is arranged between the signal sampling module and the controller 130, and is used for buffering the digital signal output by the signal sampling module for the controller to use; the data storage medium is a permanent memory storage and is used for storing the digital signals output by the signal sampling module. That is to say, can carry out temporary storage and permanent storage to EEG signal data to when this EEG signal collection system was not the networking work, also can gather and save EEG signal data, the later stage of being convenient for is utilized.

When the controller 130 is specifically implemented, a chip such as an ARM chip, an FPGA chip, or a DSP chip may be specifically applied, and programmed. The 5G communication module 140 is in communication connection with an external device with a 5G transceiver module; the outside plant includes: the network cloud equipment is connected into the 5G network and/or the electroencephalogram signal processing computer is connected into the 5G network; the network cloud equipment is used for instantly storing the electroencephalogram output signals; and the electroencephalogram signal processing computer is used for carrying out instant processing on the electroencephalogram output signal. Certainly, after the external device is in communication connection with the electroencephalogram signal acquisition system, the authority of the external device may also be identified, and the external device may adjust the control parameter of the controller 130, for example, the controller 130 may adjust the amplitude increase multiple of the signal amplitude control module 121, may also adjust the sampling rate of the analog signal in the signal acquisition module, and of course, may also adjust other parameters that the controller 130 may control.

The inventor of the application finds that some electroencephalogram signals can be accurately measured only by measuring the electroencephalogram signals in actual life, and the acquisition accuracy of the electroencephalogram signals is limited by the existing electroencephalogram signal acquisition equipment in the prior art. The inventor of this application can carry out the acquirement of EEG signal in people's actual life in order to make the measuration of EEG signal more accurate, therefore utilizes 5G communication module 140, makes the EEG signal collection system that can carry out the application in actual life, and convenient to use person carries, can adapt to more application occasions.

The embodiment of the invention increases the portability of the electroencephalogram acquisition system. The electroencephalogram acquisition system adopting wireless signal transmission has the defect of low communication speed. Therefore, the embodiment of the invention provides an electroencephalogram signal acquisition system based on 5G wireless communication, and China officially issues a 5G operation license plate, which means that China officially enters the 5G era. In the future, 5G communication can be widely applied in China, and corresponding supporting software and hardware supporting facilities can be rapidly completed. The 5G communication has the characteristics of ultra-reliability, low time delay, wide bandwidth and high speed, and by means of the strong performance of the 5G communication, the electroencephalogram signal can be quickly communicated, more electroencephalogram data can be transmitted within the same time, and data simplification is not needed as in the past. Therefore, the embodiment of the invention can comprehensively improve the real-time property, accuracy and portability of electroencephalogram signal acquisition.

Referring to fig. 5, fig. 5 is a flowchart illustrating a method for controlling an electroencephalogram signal acquisition system according to an embodiment of the present invention.

The embodiment of the invention provides a control method of an electroencephalogram signal acquisition system, which is applied to the electroencephalogram signal acquisition system in any one of the above embodiments, and comprises the following steps:

step S51: receiving an electroencephalogram output signal output by the analog signal processing channel;

step S52: and transmitting the electroencephalogram output signal output by the analog signal processing channel to external equipment.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.