The present invention relates to the brain wave acquisition devices that bio signal technical field more particularly to a kind of focus recognize.
Summary of the invention
In view of above-mentioned analysis, the embodiment of the present invention is intended to provide a kind of brain wave acquisition device of focus identification, toIt is cumbersome to solve existing testing procedure, time-consuming tediously long, high-precision device is at high cost, dresses cumbersome, and identification accuracy is low and real-timeThe problem of difference, the device can go out the focus of brain, convenient test, accuracy by the EEG signals real-time identification measuredHeight, and cost is relatively low.
The embodiment of the invention provides a kind of brain wave acquisition devices of focus identification, which includes signal transduction mouldBlock, impedance detection module, input buffer module, high-precision amplification module, analog-to-digital conversion module, signal processing module, common mode suppressionMolding block and wireless data transfer module；The signal transduction module, for acquiring and exporting original EEG signals respectively extremelyThe input buffer module and the impedance detection module；The impedance detection module, for turning the original EEG signalsTurn to impedance voltage signal；The input buffer module, for obtaining complete EEG signals；The high-precision amplification module,For amplifying the EEG signals of the input buffer module output, while the common mode is sent by amplified EEG signals and is pressed downMolding block；The analog-to-digital conversion module, for amplified EEG signals to be converted to digital signal；The common mode inhibition mouldBlock, for being reversely input to the signal transduction module after carrying out common mode interference elimination to amplified EEG signals；The letterNumber processing module extracts specially for parsing real-time impedance from the impedance voltage signal, while from the digital signalNote degree evidence is transmitted to the wireless data transfer module.
Another embodiment based on above-mentioned apparatus, the real-time impedance value that the signal processing module judgement parses are less thanWhen 50K Ω, analyzes the digital signal being currently received and extract focus data.
Optionally, the wireless data transfer module is externally sent after receiving the focus data.
Optionally, the signal transduction module is using the dry electrode of silver-colored silver chloride material；The high-precision amplification module usesHigh-precision meter amplification chip AD8221；The common mode inhibition module uses operational amplifier ad8639.
Optionally, the input buffer module includes operational amplifier U1 and operational amplifier U7；Wherein, the operation is putThe core chips that big device U1 is used is AD8638ARJZ, and the core chips that the operational amplifier U7 is used is AD8638ARJZ.
Optionally, the analog-to-digital conversion module includes conversion chip U5 and crystal oscillator U6；Wherein, the conversion chip U5 is usedCore chips be Ads1298, the chip that the crystal oscillator U6 is used is 2.048MHz crystal oscillator.
Optionally, the port of the signal transduction module includes input terminal, common mode input, output end and impedance outputEnd；Wherein, input terminal acquires original EEG signals, and common mode input terminal is connect with the output end of the common mode inhibition module, exportsIt holds and is connect with the input terminal of the input buffer module, impedance output is connect with the input terminal of the impedance detection module.
Optionally, the port of the high-precision amplification module includes input, output end and common-mode output；Wherein, defeatedEnter end to connect with the output end of the input buffer module, output end is connect with the input terminal of the analog-to-digital conversion module, common modeOutput end is connect with the input terminal of the common mode inhibition module.
Optionally, the output end of the common mode inhibition module is connect with the input terminal of the signal transduction module.
Optionally, the port of the signal processing module includes input terminal, impedance input and communication terminal；Wherein, it inputsEnd is connect with the output end of the analog-to-digital conversion module, and impedance input is connect with the output end of the impedance detection module, is led toNews end is connect with the communication terminal of the wireless data transfer module.
Above-mentioned technical proposal has the beneficial effect that: the embodiment of the present invention discloses a kind of brain wave acquisition dress of focus identificationIt sets, which includes signal transduction module, impedance detection module, input buffer module, high-precision amplification module, analog-to-digital conversion mouldBlock, signal processing module, common mode inhibition module and wireless data transfer module；The signal transduction module, for acquiring simultaneouslyOriginal EEG signals are exported respectively to the input buffer module and the impedance detection module；The impedance detection module is usedIn converting impedance voltage signal for the original EEG signals；The input buffer module, for obtaining complete brain telecommunicationsNumber；The high-precision amplification module, for amplifying the EEG signals of the input buffer module output, while by amplified brainElectric signal is sent to the common mode inhibition module；The analog-to-digital conversion module, for amplified EEG signals to be converted to numberWord signal；The common mode inhibition module, for being reversely input to institute after carrying out common mode interference elimination to amplified EEG signalsState signal transduction module；The signal processing module, for parsing real-time impedance from the impedance voltage signal, while from instituteIt states and extracts focus data in digital signal and be transmitted to the wireless data transfer module.Compared with prior art, the deviceThe step of realizing focus identification is simple, and current focus situation can be accurately picked out in the short time, can be distinguished in real timeKnow focus information, identification precision is high and low in cost；It wears simultaneously simply, supports to be band i.e. use.
It in the present invention, can also be combined with each other between above-mentioned each technical solution, to realize more preferred assembled schemes.ThisOther feature and advantage of invention will illustrate in the following description, also, certain advantages can become from specification it is aobvious andIt is clear to, or understand through the implementation of the invention.The objectives and other advantages of the invention can by specification, claims withAnd it is achieved and obtained in specifically noted content in attached drawing.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, andTogether with embodiments of the present invention for illustrating the principle of the present invention, it is not intended to limit the scope of the present invention.
For current brain focus obtain main way identification result obtained it is expensive, and topic testThe time-consuming tediously long inconvenient problem of mode, the invention proposes a kind of brain wave acquisition devices of focus identification.
A specific embodiment of the invention, as shown in Figure 1, a kind of brain wave acquisition device of focus identification is disclosed,The device include signal transduction module, impedance detection module, input buffer module, high-precision amplification module, analog-to-digital conversion module,Signal processing module, common mode inhibition module and wireless data transfer module；The signal transduction module, for acquiring and exportingOriginal EEG signals are respectively to the input buffer module and the impedance detection module；The impedance detection module, being used for willThe original EEG signals are converted into impedance voltage signal；The input buffer module, for obtaining complete EEG signals；InstituteHigh-precision amplification module is stated, for amplifying the EEG signals of the input buffer module output, while by amplified brain telecommunicationsNumber it is sent to the common mode inhibition module；The analog-to-digital conversion module, for amplified EEG signals to be converted to digital letterNumber；The common mode inhibition module, for being reversely input to the letter after carrying out common mode interference elimination to amplified EEG signalsNumber conduction module；The signal processing module, for parsing real-time impedance from the impedance voltage signal, while from the numberFocus data are extracted in word signal is transmitted to the wireless data transfer module.Compared with prior art, the present embodiment mentionsThe brain wave acquisition device of the focus identification of confession can go out the focus of brain, test by the EEG signals real-time identification measuredConvenient, accuracy height, and cost is relatively low.
Fig. 2 is the work flow diagram for the brain wave acquisition device that the focus of the embodiment of the present invention recognizes.
In conjunction with Fig. 2 it is found that the specific implementation process that the focus of the brain wave acquisition of the embodiment of the present invention recognizes, namely it is absorbed inSpend the workflow of the brain wave acquisition device of identification, the specific steps are as follows:
S201, EEG signals are complete by signal transduction module and are transmitted to the input terminal of impedance detection module and defeated simultaneouslyEnter in the input terminal of buffer module；
S202, EEG signals are completely obtained and are transmitted to high-precision amplification module by input buffer module carries out high-precisionAmplification, while the common-mode output of high-precision amplification module sends common mode inhibition module for common-mode signal and carries out common mode inhibition,And reversely it is input to signal transduction module；
S203, EEG signals carry out precise acquisition by analog-to-digital conversion module after amplifying by high-precision amplification module and sendIt is calculated to signal processing module, at the voltage signal that signal processing module simultaneously also sends impedance detection moduleReason, parses corticocerebral real-time impedance；
S204, signal processing module are gone out current special by collected brain electric information and the real-time impedance real-time identification parsedDegree evidence is infused, and is externally sent by wireless data transfer module.
It should be noted that common mode inhibition module is to after common-mode signal progress common mode inhibition and reversed defeated in S202 stepEntering to signal transduction module realizes effective inhibition to common-mode signal, and in S203 step, signal processing module is to precise acquisitionTo EEG signals handled while voltage signal that also impedance detection module is sent handle, parse brain skinThe real-time impedance of layer realizes the real-time monitoring to contact impedance between electrode and cerebral cortex.
A specific embodiment of the invention, the real-time impedance value that the signal processing module judgement parses are less than 50KWhen Ω, analyzes the digital signal being currently received and extract focus data.That is, signal processing module passes throughThe impedance threshold of setting determines whether to analyze the digital signal that is currently received and extracts focus data, Ji KeshiWhen by detection contact impedance come guarantee focus measurement accuracy.
A specific embodiment of the invention, the wireless data transfer module receive after the focus data externallyIt sends.That is, the wireless data transfer module by PORT COM receive signal processing module extract it is described speciallyDegree evidence is infused, and is outwardly sent with radio format.In practical application, the wireless data transfer module is as standalone moduleIt is built in circuit board.
A specific embodiment of the invention, the signal transduction module is using the dry electrode of silver-colored silver chloride material；The heightPrecision amplification module uses high-precision meter amplification chip AD8221；The common mode inhibition module uses operational amplifierad8639.What needs to be explained here is that EEG signals can be transmitted to completely and simultaneously using the dry electrode of silver-colored silver chloride materialThe input terminal of impedance detection module and the input terminal of input buffer module.It can be right using high-precision meter amplification chip AD8221Complete EEG signals carry out high-precision amplification.Effective suppression to common-mode signal can be realized using operational amplifier ad8639System.
Fig. 3 is the structure chart of the input buffer module of the embodiment of the present invention.
A specific embodiment of the invention, the input buffer module includes operational amplifier U1 and operational amplifierU7；Wherein, the core chips that the operational amplifier U1 is used is AD8638ARJZ, the core that the operational amplifier U7 is usedChip is AD8638ARJZ.It should be noted that the input buffer module is total by using high-precision, high input impedance and heightMould inhibits the operational amplifier of ratio to improve input impedance and common-mode rejection ratio.
As shown in the structure chart for inputting buffer module, referring to Fig. 3, inputs buffer module and put by operational amplifier U1 and operationBig device U7 composition；Specific connection relationship is as follows on circuit board: the pin 1 of operational amplifier U1 respectively with one end of resistance R41, fortuneThe pin 4 for calculating amplifier U1 connects, and the other end of resistance R41 is connect with one end of output end, resistance R11 respectively, resistance R11'sOne end is connect with one end of input terminal, resistance R12 respectively, and the other end of resistance R12 is put with one end of capacitor C10, operation respectivelyThe pin 3 of big device U1 connects, and the pin 2 of operational amplifier U1 is connect with the cathode of 3.3V DC power supply, operational amplifier U1'sPin 5 is connect with the anode of 3.3V DC power supply；The pin 1 of operational amplifier U7 respectively with one end of resistance R2, operation amplifierThe pin 4 of device U7 connects, and the other end of resistance R2 is connect with one end of output end, resistance R3 respectively, the other end point of resistance R3Do not connect with one end of input terminal, resistance R20, the other end of resistance R20 respectively with one end of capacitor C19, operational amplifier U7Pin 3 connect, the pin 2 of operational amplifier U7 connect with the cathode of 3.3V DC power supply, the pin 5 of operational amplifier U7 andThe anode connection of 3.3V DC power supply.
Fig. 4 is the structure chart of the analog-to-digital conversion module of the embodiment of the present invention.
A specific embodiment of the invention, the analog-to-digital conversion module include conversion chip U5 and crystal oscillator U6；Wherein, instituteStating the core chips that conversion chip U5 is used is Ads1298, and the chip that the crystal oscillator U6 is used is 2.048MHz crystal oscillator.It needsIt is bright, the analog-to-digital conversion module using 24 high precision analogue conversion chip ADS1298 by amplified EEG signals intoRow high precision collecting, and be converted into digital signal and be sent to signal processing module progress focus identification calculating.
As shown in the structure chart of analog-to-digital conversion module, referring to fig. 4, analog-to-digital conversion module is by modulus conversion chip U5 and crystal oscillatorU6 composition；Specific connection relationship is as follows on circuit board: the pin A3 of modulus conversion chip U5 is respectively with modulus conversion chip U5'sOne end connection of pin B3, one end of resistance R8, capacitor C31, the pin C3 of modulus conversion chip U5 are another with resistance R8 respectivelyThe other end connection of one end, capacitor C31, the pin A4 of modulus conversion chip U5, the pin B4 of modulus conversion chip U5, modulus turnChange the pin C6 of chip U5, the pin B6 of modulus conversion chip U5, the pin A6 of modulus conversion chip U5, modulus conversion chip U5Pin A7 connect with the anode of 2.5V DC power supply, the pin D4 of modulus conversion chip U5, modulus conversion chip U5 drawPin A8, the mould of foot C5, the pin B5 of modulus conversion chip U5, the pin A5 of modulus conversion chip U5, modulus conversion chip U5Number conversion chip U5 pin D5 connect with the cathode of 2.5V DC power supply, the cathode of 2.5V DC power supply respectively with capacitorOne end of C52, one end of capacitor C54, one end of capacitor C59, one end of capacitor C60, one end of capacitor C82, capacitor C83 oneOne end connection at end, one end of capacitor C84, one end of capacitor C92, one end of capacitor C97, capacitor C51, capacitor C52's is anotherEnd, capacitor C54 the other end connect with the pin B7 of modulus conversion chip U5, the other end of capacitor C59, capacitor C60 it is anotherOne end is grounded, and the other end of capacitor C82, the other end of capacitor C83 are connect with the pin H3 of modulus conversion chip U5, capacitorThe other end of C84 is connect with the pin H6 of modulus conversion chip U5, the other end of capacitor C92 and the pin of modulus conversion chip U5G3 connection, the other end of capacitor C97 are connect with the pin H5 of modulus conversion chip U5, the other end and analog-to-digital conversion of capacitor C51The pin D3 connection of chip U5, pin G2, the modulus conversion chip of the pin E4 of modulus conversion chip U5, modulus conversion chip U5The pin H7 of U5, the pin D7 of modulus conversion chip U5, modulus conversion chip U5 pin B8 be grounded, modulus conversion chip U5Pin C8, modulus conversion chip U5 pin D8 with 3.3V DC power supply anode connect, modulus conversion chip U5's drawsFoot H1 is connect with the output end of high-precision amplification module, the pin H2 ground connection of modulus conversion chip U5, modulus conversion chip U5'sThe connection of 1 interface of control terminal of pin D6 and signal processing module, the pin E8 of modulus conversion chip U5 and signal processing moduleThe connection of 2 interface of control terminal, the pin F7 of modulus conversion chip U5 and 3 interface of control terminal of signal processing module connect, and modulus turns4 interface of control terminal of the pin F8 and signal processing module that change chip U5 connect, the pin G7 and signal of modulus conversion chip U55 interface of control terminal of processing module connects, and the pin H8 of modulus conversion chip U5 and 6 interface of control terminal of signal processing module connectIt connects, the pin G5 of modulus conversion chip U5 and 7 interface of control terminal of signal processing module connect, the pin of modulus conversion chip U5The connection of 8 interface of control terminal of E6 and signal processing module, the pin G6 of modulus conversion chip U5 are connect with one end of resistance R50,The other end of resistance R50 respectively with one end of resistance R51, the pin 1 of crystal oscillator U6, the pin 4 of crystal oscillator U6, capacitor C77 one end,The anode connection of 3.3V DC power supply, another section of R51 connect with 9 interface of control terminal of signal processing module, analog-to-digital conversion coreThe pin 3 of the pin G8 and crystal oscillator U6 of piece U5 are connect, and the pin 2 of crystal oscillator U6 connects with the other end of power ground, capacitor C77 respectivelyIt connects.
A specific embodiment of the invention, as shown in connection with fig. 1, the port of the signal transduction module include input terminal,Common mode input, output end and impedance output；Wherein, input terminal acquires original EEG signals, common mode input terminal with it is described totalThe output end of mould suppression module connects, and output end is connect with the input terminal for inputting buffer module, impedance output with it is describedThe input terminal of impedance detection module connects.There are four ends for the tool of signal transduction module described in the brain wave acquisition device of the present embodimentMouthful, it is separately connected extraneous brain electricity, the output end of the common mode inhibition module, the input terminal of the input buffer module, the resistanceThe input terminal of anti-detection module.
A specific embodiment of the invention, as shown in connection with fig. 1, the port of the high-precision amplification module include inputEnd, output end and common-mode output；Wherein, input terminal with it is described input buffer module output end connect, output end with it is describedThe input terminal of analog-to-digital conversion module connects, and common-mode output is connect with the input terminal of the common mode inhibition module.The present embodimentThere are three ports for the tool of high-precision amplification module described in brain wave acquisition device, are separately connected the output of the input buffer moduleEnd, the input terminal of the analog-to-digital conversion module, the common mode inhibition module input terminal.
A specific embodiment of the invention, as shown in connection with fig. 1, the output end and the signal of the common mode inhibition moduleConduct the input terminal connection of module.In the present embodiment, it is dry that the common mode inhibition module carries out common mode to amplified EEG signalsIt is reversely input to the signal transduction module after disturbing elimination, realizes effective inhibition to common-mode signal.
A specific embodiment of the invention, as shown in connection with fig. 1, the port of the signal processing module include input terminal,Impedance input and communication terminal；Wherein, input terminal is connect with the output end of the analog-to-digital conversion module, impedance input with it is describedThe output end of impedance detection module connects, and communication terminal is connect with the communication terminal of the wireless data transfer module.The present embodimentThe tool of signal processing module described in brain wave acquisition device there are three port, be separately connected the analog-to-digital conversion module output end,The communication terminal of the output end of the impedance detection module, the wireless data transfer module.
In conclusion the brain wave acquisition device that a kind of focus of the embodiment of the present invention recognizes, which includes that signal passesGuide module, input buffer module, high-precision amplification module, analog-to-digital conversion module, signal processing module, is total to impedance detection moduleMould suppression module and wireless data transfer module；The signal transduction module, for acquiring and exporting original EEG signals pointNot to the input buffer module and the impedance detection module；The impedance detection module is used for the original brain telecommunicationsNumber it is converted into impedance voltage signal；The input buffer module, for obtaining complete EEG signals；The high-precision amplification mouldBlock for amplifying the EEG signals of the input buffer module output, while sending amplified EEG signals to described totalMould suppression module；The analog-to-digital conversion module, for amplified EEG signals to be converted to digital signal；The common mode inhibitionModule, for being reversely input to the signal transduction module after carrying out common mode interference elimination to amplified EEG signals；It is describedSignal processing module for parsing real-time impedance from the impedance voltage signal, while being extracted from the digital signalFocus data are transmitted to the wireless data transfer module.The brain wave acquisition device of the embodiment of the present invention is used for human body focusAccurate identification, compared with prior art, beneficial effects of the present invention specifically:
1, testing procedure is simple, and current focus situation can be accurately picked out in the short time；
2, identification precision is high and low in cost；
3, it wears simply, supports to be band i.e. use；
It 4, can real-time identification focus information.
That is, the brain wave acquisition device of focus identification provided in this embodiment can be real-time by the EEG signals measuredThe focus of brain is picked out, convenient test, accuracy are high, and cost is relatively low.
It will be understood by those skilled in the art that realizing all or part of the process of above-described embodiment method, meter can be passed throughCalculation machine program is completed to instruct relevant hardware, and the program can be stored in computer readable storage medium.Wherein, instituteStating computer readable storage medium is disk, CD, read-only memory or random access memory etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,It should be covered by the protection scope of the present invention.