CN104586388A - Fatigue driving detection system based on electroencephalogram recognition - Google Patents
Fatigue driving detection system based on electroencephalogram recognition Download PDFInfo
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- CN104586388A CN104586388A CN201510038325.3A CN201510038325A CN104586388A CN 104586388 A CN104586388 A CN 104586388A CN 201510038325 A CN201510038325 A CN 201510038325A CN 104586388 A CN104586388 A CN 104586388A
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- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
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Abstract
The invention provides a fatigue driving detection system based on electroencephalogram recognition. The fatigue driving detection system comprises an electroencephalogram acquisition unit, a fatigue EEG (electroencephalogram) signal unit, a driving simulation unit, a control center unit, a real-time EEG signal acquisition unit, an alarm unit and a real-time driving unit, wherein the electroencephalogram acquisition unit is arranged between the fatigue EEG signal unit and the driving simulation unit to perform a function of collecting the fatigue EEG signal unit from a driving simulation state; the control center unit is arranged on the upper part of the real-time EEG signal acquisition unit to perform a function of comparing and analyzing an EEG signal; the alarm unit is arranged on the right side of the real-time driving unit to perform a function of transferring a fatigue driving alarm signal. The fatigue driving detection system can be free from the influence of external environment and the personal behavior of a driver, has an accurate detection degree, does not depend on the subjective assessment of the driver and achieves a better detection effect.
Description
Technical field
The invention belongs to a kind of fatigue driving detecting system field, particularly relate to a kind of fatigue driving detecting system based on electroencephalogram identification.
Background technology
Along with improving constantly of Chinese Urbanization and motorization level, safety has become the increasingly serious problem in road traffic aspect.In traffic and transportation system, fatigue driving is the main cause of severe traffic accidents, shows the causation analysis of a large amount of vehicle accident, and in driving fatigue, the perception of driver is tired, judge that decision-making fatigue starts the main cause of a vehicle accident.Fatigue driving is the major hidden danger of ride safety of automobile, and the research of its detection system is significant for the improvement of traffic safety status.Contain abundant information due to EEG signals and directly reflect the cerebral activity situation of driver, the more and more convenient and price of brain wave acquisition device constantly declines, and driving fatigue is acknowledged as the most accurately, the most objective analytical method therefore to utilize EEG signals to judge.The fatigue driving detecting system generally adopted at present also exists that to detect degree of fatigue not accurate enough, and the feature of detection affects greatly by external environment and individual behavior, dependence driver's subjective assessment and the problem that causes metrical error large.
Therefore, invent a kind of fatigue driving detecting system based on electroencephalogram identification and seem very necessary.
Summary of the invention
In order to solve the problems of the technologies described above, the object of present case is to provide a kind of fatigue driving detecting system based on electroencephalogram identification, be intended to solve detection degree of fatigue not accurate enough, the feature detected affects greatly by external environment and individual behavior, rely on driver's subjective assessment and the problem that causes metrical error large
A kind of fatigue driving detecting system based on electroencephalogram identification of the present invention, brain wave acquisition unit should be comprised based on the fatigue driving detecting system of electroencephalogram identification, tired EEG signal unit, drive simulating unit, control centre's unit, Real-time Collection EEG signal unit, alarm unit and drive unit in real time;
Brain wave acquisition unit, is connected with tired EEG signal unit and drive simulating unit, for from the tired EEG signal unit of drive simulating state acquisition;
Control centre's unit, with tired EEG signal unit, Real-time Collection EEG signal unit, alarm unit connects, for comparative analysis EEG signal;
Alarm unit, and in real time drives unit and is connected, for transmitting fatigue driving alarm signal;
Real-time Collection EEG signal unit, and in real time drives unit and is connected, for carrying real-time EEG signal.
Further, brain wave acquisition unit comprises the marconigram helmet, EEG signal sensor and signal processor.
Further, signal processor, comprising: multiple frequency converter, and it carries out frequency inverted to export switching signal to input signal; And efferent, the described switching signal that its synthesis exports from multiple frequency converter also exports composite signal, multiple frequency converter is formed in monolithic semiconductor chip, and multiple frequency converter carries out frequency inverted to convert the switching signal being in different frequency bands to.
Further, each in frequency converter carries out frequency inverted to the signal being in predetermined frequency band as input signal, and exports the switching signal being in more high frequency band than predetermined frequency band;
Also be formed for the synthesis of switching signal in semiconductor chip and export the combining unit of composite signal; Combining unit is the junction point carrying out connecting between each output connecting line of multiple frequency converter;
Each in frequency converter has the amplifier for amplifying switching signal, and at least outlet side place of amplifier in input side and outlet side has inductive load;
In semiconductor chip, be also formed with the multiple P/S transducers for parallel data being converted to serial data, and the serial data as baseband signal exported from one of described P/S transducer for a pair of frequency converter carries out frequency inverted;
Composite signal wirelessly transmits;
Composite signal is transmitted by Medium Wave Guide;
Frequency converter carries out frequency inverted, baseband signal to be converted to the described switching signal that residing frequency band is equal to or higher than 30GHz.
Further, the signal processing method of signal processor comprises: carry out frequency inverted to convert the switching signal being in different frequency bands to by multiple frequency converter, and multiple frequency converter is used for carrying out frequency inverted to export switching signal to input signal; Switching signal is exported after the frequency converter by signal processor carries out frequency inverted to described input signal; And the switching signal that synthesis exports from multiple frequency converter is to export composite signal; Wherein, be provided for carrying out frequency inverted to export described multiple frequency converter of switching signal and to export the efferent of composite signal for the synthesis of the switching signal exported from multiple frequency converter to input signal, and multiple frequency converter is formed in monolithic semiconductor chip;
Signal processing method, it comprises: carry out frequency inverted to convert the switching signal being in different frequency bands to by multiple frequency converter, and multiple frequency converter is used for carrying out frequency inverted to export input signal to the switching signal obtained by carrying out frequency inverted to input signal;
At least be dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter; And by frequency converter, frequency inverted is carried out to export described input signal to switching signal, wherein, signal processor be at least dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter, and multiple frequency converter is formed in monolithic semiconductor chip.
Further, signal processor, it comprises: multiple frequency converter, it carries out frequency inverted to export input signal to the switching signal obtained by carrying out frequency inverted to input signal, wherein, multiple frequency converter is formed in monolithic semiconductor chip, multiple frequency converter carries out frequency inverted to the switching signal being in different frequency bands, and to be at least dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter,
Signal processor, it comprises: multiple first frequency transducer, and it carries out frequency inverted to export switching signal to input signal, and multiple second frequency transducer, frequency inverted is carried out to export input signal to switching signal, multiple first frequency transducer and multiple second frequency transducer are formed in monolithic semiconductor chip, multiple first frequency transducer carries out frequency inverted to convert the switching signal being in different frequency bands to, the switching signal exported from multiple first frequency transducer is synthesized, and export composite signal, multiple second frequency transducer carries out frequency inverted to the switching signal being in different frequency bands, and to each in multiple frequency converter at least distribute from second half conductor chip composite signal at least for being carried out the switching signal in the frequency band of frequency inverted by frequency converter.
Further, each in frequency converter is carried out frequency inverted to the switching signal as the signal being in more high frequency band than predetermined frequency band and is exported the signal being in predetermined frequency band;
In semiconductor chip, be also formed with dispenser, dispenser at least distributes the switching signal for being undertaken by frequency converter in the frequency band of frequency inverted to each in described multiple frequency converter;
Dispenser is the junction point carrying out connecting between each input connecting line of multiple frequency converter;
Each in frequency converter has the amplifier for amplifying the signal inputing to frequency converter, and amplifier has inductive load at least input side place of input side and outlet side;
The multiple S/P transducers for serial data being converted to parallel data are also formed in semiconductor chip, and a pair of frequency converter is carried out frequency inverted to convert the serial data as baseband signal to for the switching signal of being undertaken by frequency converter in the frequency band of frequency inverted, and the serial data after frequency inverted is provided to one of S/P transducer;
Composite signal wirelessly transmits; Composite signal is transmitted by Medium Wave Guide;
Frequency converter carries out frequency inverted, converts baseband signal to the switching signal residing frequency band being equal to or higher than 30GHz.
Further, alarm unit comprises wireless signal receiver and voice announcer;
Wireless signal receiver, comprise USB plug and be connected to the reception of wireless signals end bottom USB plug, USB plug and reception of wireless signals end wide, wider than Universal USB plug, also be longer than than Universal USB plug, one side of USB plug has rectangle draw-in groove, the base of this draw-in groove to USB plug another side between be provided with data line contact face, the data line contact face in this data line contact face and Universal USB plug is wide;
USB interface comprises drain pan, lid, USB socket and automatic pop-up device, and USB socket and automatic pop-up device are housed in wherein by drain pan and lid cooperation, drain pan comprises base plate, two the first side walls be arranged in parallel and the second sidewall and perpendicular to first, second sidewall and the 3rd sidewall be parallel to each other and the 4th sidewall, second sidewall has a rectangular aperture that can hold USB wireless signal receiver and pass near one end of the 3rd sidewall, base plate is provided with perpendicular to the first side wall and abuts the first guide rail and second guide rail of this first side wall, the top of this first guide rail and the second guide rail flushes and keeps a segment distance between the second sidewall, the arc-shaped guide rail of abutting second sidewall is extended on the top of the first guide rail, this arc-shaped guide rail is protruding toward the direction away from the 3rd sidewall, USB socket is blanket socket, be fixed on the base plate between the second guide rail and the 3rd sidewall, its insert port is just to rectangular aperture, and this insert port is greater than the thickness of the reception of wireless signals end of USB wireless signal receiver to the distance of rectangular aperture, and the bottom of USB socket flushes with the top of the second guide rail,
Automatic pop-up device comprises slide block, elastic component and spring, the lower surface of slide block is provided with and first on base plate, the chute that second guide rail matches, slide block be placed in this first, on second guide rail, bottom is towards the first side wall, top is towards the second sidewall, and this first, move back and forth between second sidewall, a depression bar is extended on the top of this slide block between arc-shaped guide rail and USB socket, the top of depression bar be provided with the draw-in groove on USB wireless signal receiver with the use of locating piece, the upper surface that this slide block is positioned between the first guide rail and the 4th sidewall is provided with accepting groove, this accepting groove comprise slip into conduit and eject conduit, one end of spring abuts the first side wall of drain pan, the other end extends in the accepting groove of slide block, abut the bottom of this accepting groove, the slider top that the two ends of elastic component abut the second sidewall on base plate respectively and are positioned at above accepting groove, provide elastic force for slide block moves back and forth between first and second sidewall,
During initial position, the top of slide block flushes with the top of the second guide rail on base plate, and spring is connected to the bottom of slide block accepting groove;
After USB wireless signal receiver inserts, the socket of this USB wireless signal receiver props up the top of slide block, and locating piece embeds in the draw-in groove of USB wireless signal receiver, makes the bottom of USB wireless signal receiver keep flushing with the second sidewall on base plate;
The top of slide block is provided with state's fixed column, this fixed leg is positioned at the top of accepting groove, base plate between arc-shaped guide rail and the 3rd sidewall is also provided with fixed leg, the two ends of elastic component are set in the fixed leg of base plate and the fixed leg periphery of slide block respectively, provide elastic force for slide block moves back and forth between first and second sidewall;
Accepting groove comprises the first conduit be connected successively, second conduit, 3rd conduit, 4th conduit and the 5th conduit, first conduit starts from the bottom of slide block, and extend in the top orientation to slide block, 4th conduit be arranged in parallel with the first conduit and top flushes, 4th conduit is shorter than the first conduit, the two ends of the 5th conduit are connected with the 4th channel floor with the first channel floor respectively, 5th conduit and the first conduit are connected to form an acute angle, the second conduit and the 3rd conduit that connect in V-shape is connected with between the middle part of the first conduit top and the 4th conduit, the recess of V word points to the 5th conduit, this first conduit and the second conduit are formed and eject conduit, 3rd conduit, 4th conduit and the 5th conduit are formed and slip into conduit, after USB wireless signal receiver inserts, spring is equipped in the recess that the second conduit and the 3rd conduit are V-shape junction,
The junction of the 5th conduit and the first conduit is provided with guiding steel disc, and the direction of this guiding steel disc is identical with the direction of the 5th conduit.
Further, described real-time driving unit comprises brain electro-detection instrument and wireless data transmitter;
Brain electro-detection instrument, comprise pre-amplification circuit, Anti-aliasing Filter Circuits, a/d converter and analysis computer, the amplifier in pre-amplification circuit is in low gain state, and amplification controls at 5 ~ 10 times; Described pre-amplification circuit, Anti-aliasing Filter Circuits and a/d converter have several respectively, wherein each pre-amplification circuit, an Anti-aliasing Filter Circuits are connected formation one sampling and analog to digital conversion circuit respectively successively with an a/d converter, some samplings and analog to digital conversion circuit are connected in parallel, form some circuit-switched data stream, then collect circuit by a high-speed data and accumulate a high-speed data and flow through data transmission circuit and deliver to analysis computer and carry out treatment and analysis;
Described high-speed data collects that circuit comprises master clock, sequential logical circuit, collects bus, latch/serial shift register and several buffered gates; The data of sampling are delivered to a buffered gate by each bar sampling and analog to digital conversion circuit respectively; Described sequential logical circuit, based on described master clock, according to the requirement of frame structure, gate-control signal is sent by the gate-control signal line that the different moment never goes the same way, and controls corresponding buffered gate and opens, the sampled data on this road delivered to and collect in bus; After sampled data on Mei Tiao road is sent to and collects bus, described sequential logical circuit is all sent latch signal to described latch/serial shift register and is loaded in described latch/serial shift register by data, and the data of loading are exported formation high-speed data-flow in a serial fashion by described latch/serial shift register under the control of serial clock;
Sampling and analog to digital conversion circuit have 70, form 70 data flow path;
Data transmission circuit adopts the mode connect into analysis computer of Fiber isolation and USB interface;
Pre-amplification circuit adopts the instrument amplifier AD620 of high cmrr and high input impedance;
Anti-aliasing Filter Circuits is step low-pass active filter circuit;
A/d converter adopts Σ-⊿ type a/d converter ADS1251.
Further, control centre's unit is specifically provided with the processor of S3C2440A model; Voice broadcast implement body is provided with the speech chip that model is WT588D-20SS; Brain electro-detection instrument specifically adopts sample frequency to be the Emotiv electroencephalogramdata data collector of 128HZ.
Beneficial effect of the present invention is: the present invention can not be subject to the impact of external environment and driver personal behavior, and detection level is accurate, does not rely on the subjective assessment of driver, reaches good Detection results.USB wireless signal receiver of the present invention and USB interface with the use of, it is simple to operate, push in USB interface by whole for USB wireless signal receiver, prevent the bottom of USB wireless signal receiver to scratch other things, or cause loose contact because other things hook.First Simulation scale-up and filtering is carried out respectively with existing multichannel EEG signals, then the timesharing through analog switch switches, form a road analogue signal and carry out AD conversion, again conversion after data by various communication media be sent in computer carry out process difference, Shi Duige road of the present invention EEG signals is carried out low multiple amplification and is then carried out sampling and mould-number conversion by the Σ-⊿ type a/d converter of low-cost and high-precision respectively, form multiplex data stream, become a road high-speed data-flow to deliver to computer by the tandem of a high-speed data junction circuit and carry out treatment and analysis, adopt EEG checking device of the present invention to meet and two-forty (the every passage of 10KHz) is carried out to multichannel EEG signals simultaneously, the requirement that high accuracy (24bit) is sampled, thus make this device have good stability, capacity of resisting disturbance is strong, the features such as frequency band range is wide, the analysis field of event related potential can be applied to, the present invention is directed to each road analogue signal and really accomplished 24 conversion accuracies, thus greatly can reduce the gain of preamplifier, simplify circuit design, substantially increase input dynamic range, the present invention is directed to each road analogue signal and really accomplished the sample rate of 10KHz, thus substantially increase the bandwidth of gathered EEG signals, for the middle-and-high-ranking cognitive potential of EEG signals (event related potential) analysis provides technical support, owing to having carried out the data conversion of high accuracy and high sampling rate to analogue signal, the significantly interfering signal be blended in useful signal can be removed by the method for software processing in data after conversion, thus improve jamproof effect, reduce jamproof cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the fatigue driving detecting system based on electroencephalogram identification that the embodiment of the present invention provides;
In figure: 1-brain wave acquisition unit, the 11-marconigram helmet, 12-EEG signal transducer, the tired EEG signal unit of 13-signal processor 2-, 3-drive simulating unit, 4-control centre unit, 5-Real-time Collection EEG signal unit, 6-alarm unit, 61-wireless signal receiver, 62-voice announcer, 7-drives unit in real time, 71-brain electro-detection instrument, 72-wireless data transmitter;
Fig. 2 is the perspective view of the USB wireless signal receiver that the embodiment of the present invention provides;
Fig. 3 is the perspective view of the USB interface that the embodiment of the present invention provides;
Fig. 4 is the drain pan plan structure schematic diagram of the USB interface shown in Fig. 3 that the embodiment of the present invention provides;
Fig. 5 is the slide block perspective view of the USB interface shown in Fig. 3 that the embodiment of the present invention provides;
Fig. 6 is the brain electro-detection instrument structural representation that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further:
Embodiment:
As shown in Figure 1
The invention provides a kind of fatigue driving detecting system based on electroencephalogram identification, comprise brain wave acquisition unit 1, tired EEG signal unit 2, drive simulating unit 3, control centre's unit 4, Real-time Collection EEG signal unit 5, alarm unit 6 and in real time driving unit 7, described brain wave acquisition unit 1 is arranged between tired EEG signal unit 2 and drive simulating unit 3, plays the effect from the tired EEG signal unit of drive simulating state acquisition; Described control centre's unit 4 is arranged on the top of Real-time Collection EEG signal unit 2, plays the effect of comparative analysis EEG signal; Described alarm unit 6 is arranged on the right side of driving unit 7 in real time, plays the effect of transmitting fatigue driving alarm signal;
Further, signal processor, comprising: multiple frequency converter, and it carries out frequency inverted to export switching signal to input signal; And efferent, the described switching signal that its synthesis exports from multiple frequency converter also exports composite signal, multiple frequency converter is formed in monolithic semiconductor chip, and multiple frequency converter carries out frequency inverted to convert the switching signal being in different frequency bands to.
Further, each in frequency converter carries out frequency inverted to the signal being in predetermined frequency band as input signal, and exports the switching signal being in more high frequency band than predetermined frequency band;
Also be formed for the synthesis of switching signal in semiconductor chip and export the combining unit of composite signal; Combining unit is the junction point carrying out connecting between each output connecting line of multiple frequency converter;
Each in frequency converter has the amplifier for amplifying switching signal, and at least outlet side place of amplifier in input side and outlet side has inductive load;
In semiconductor chip, be also formed with the multiple P/S transducers for parallel data being converted to serial data, and the serial data as baseband signal exported from one of described P/S transducer for a pair of frequency converter carries out frequency inverted;
Composite signal wirelessly transmits;
Composite signal is transmitted by Medium Wave Guide;
Frequency converter carries out frequency inverted, baseband signal to be converted to the described switching signal that residing frequency band is equal to or higher than 30GHz.
Further, the signal processing method of signal processor comprises: carry out frequency inverted to convert the switching signal being in different frequency bands to by multiple frequency converter, and multiple frequency converter is used for carrying out frequency inverted to export switching signal to input signal; Switching signal is exported after the frequency converter by signal processor carries out frequency inverted to described input signal; And the switching signal that synthesis exports from multiple frequency converter is to export composite signal; Wherein, be provided for carrying out frequency inverted to export described multiple frequency converter of switching signal and to export the efferent of composite signal for the synthesis of the switching signal exported from multiple frequency converter to input signal, and multiple frequency converter is formed in monolithic semiconductor chip;
Signal processing method, it comprises: carry out frequency inverted to convert the switching signal being in different frequency bands to by multiple frequency converter, and multiple frequency converter is used for carrying out frequency inverted to export input signal to the switching signal obtained by carrying out frequency inverted to input signal;
At least be dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter; And by frequency converter, frequency inverted is carried out to export described input signal to switching signal, wherein, signal processor be at least dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter, and multiple frequency converter is formed in monolithic semiconductor chip.
Further, signal processor, it comprises: multiple frequency converter, it carries out frequency inverted to export input signal to the switching signal obtained by carrying out frequency inverted to input signal, wherein, multiple frequency converter is formed in monolithic semiconductor chip, multiple frequency converter carries out frequency inverted to the switching signal being in different frequency bands, and to be at least dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter,
Signal processor, it comprises: multiple first frequency transducer, and it carries out frequency inverted to export switching signal to input signal, and multiple second frequency transducer, frequency inverted is carried out to export input signal to switching signal, multiple first frequency transducer and multiple second frequency transducer are formed in monolithic semiconductor chip, multiple first frequency transducer carries out frequency inverted to convert the switching signal being in different frequency bands to, the switching signal exported from multiple first frequency transducer is synthesized, and export composite signal, multiple second frequency transducer carries out frequency inverted to the switching signal being in different frequency bands, and to each in multiple frequency converter at least distribute from second half conductor chip composite signal at least for being carried out the switching signal in the frequency band of frequency inverted by frequency converter.
Further, each in frequency converter is carried out frequency inverted to the switching signal as the signal being in more high frequency band than predetermined frequency band and is exported the signal being in predetermined frequency band;
In semiconductor chip, be also formed with dispenser, dispenser at least distributes the switching signal for being undertaken by frequency converter in the frequency band of frequency inverted to each in described multiple frequency converter;
Dispenser is the junction point carrying out connecting between each input connecting line of multiple frequency converter;
Each in frequency converter has the amplifier for amplifying the signal inputing to frequency converter, and amplifier has inductive load at least input side place of input side and outlet side;
The multiple S/P transducers for serial data being converted to parallel data are also formed in semiconductor chip, and a pair of frequency converter is carried out frequency inverted to convert the serial data as baseband signal to for the switching signal of being undertaken by frequency converter in the frequency band of frequency inverted, and the serial data after frequency inverted is provided to one of S/P transducer;
Composite signal wirelessly transmits; Composite signal is transmitted by Medium Wave Guide;
Frequency converter carries out frequency inverted, converts baseband signal to the switching signal residing frequency band being equal to or higher than 30GHz.
Described brain wave acquisition unit 1 comprises the marconigram helmet 11, EEG signal sensor 12 and signal processor 13, and the described marconigram helmet 11 is arranged on the left side of EEG signal sensor 12; Described signal processor 13 is arranged on the right side of EEG signal sensor 12.
Described alarm unit 6 comprises wireless signal receiver 61 and voice announcer 62, and described wireless signal receiver is arranged on the left side of voice announcer, is conducive to reminding in time driver to take care driving.
Described real-time driving unit 7 comprises brain electro-detection instrument 71 and wireless data transmitter 72, and described brain electro-detection instrument 71 is arranged on the left side of wireless data transmitter 72, and the EEG signal of Real-time Collection driver, monitors in real time for control centre's unit 4.
Described control centre 4 is specifically provided with the processor of S3C2440A model, and its abundant functional unit is that the realization of systemic-function and later upgrading are expanded and provided guarantee.
Described voice announcer 62 is specifically provided with the speech chip that model is WT588D-20SS, and capacity of resisting disturbance is strong, is widely used in detection system.
The concrete 71 employing sample frequencys of described brain electro-detection instrument are the Emotiv electroencephalogramdata data collector of 128HZ, and structure is simple, and wear conveniently, applicable driver drives in real time.
As shown in Figure 2, its axonometric chart being USB wireless signal receiver 1 of the present invention, the reception of wireless signals end 11 that this USB wireless signal receiver 1 comprises USB plug 12 and is connected to bottom USB plug, described USB plug 12 is wide with reception of wireless signals end 11, wider than Universal USB plug, also be longer than than Universal USB plug, one side of USB plug 12 has rectangle draw-in groove 121, the base of this draw-in groove 121 to USB plug 12 another side between be provided with data line contact face 122, this data line contact face 122 is wide with the data line contact face in Universal USB plug.
As shown in Figure 3, it is the schematic perspective view of USB interface 2 one of the present invention preferred embodiment.This USB interface 2 comprises drain pan 21, lid 22, USB socket 23 and automatic pop-up device 24, and drain pan 21 and lid 22 coordinate and be housed in wherein by USB socket 23 and automatic pop-up device 24, and automatic pop-up device 24 comprises spring 241, elastic component 242 and slide block 243.
As shown in Figure 4, drain pan 21 comprises the first side wall 211 and the second sidewall 212 that base plate 210, two be arranged in parallel and perpendicular to first, second sidewall 211,212 and the 3rd sidewall 213 be parallel to each other and the 4th sidewall 214, second sidewall 212 have a rectangular aperture 218 that can hold USB wireless signal receiver 1 and pass near one end of the 3rd sidewall 213; Described base plate 210 is provided with perpendicular to the first side wall 211 and abuts the first guide rail 215 and the second guide rail 216 of this first side wall 211, the top of this first guide rail 215 and the second guide rail 216 flushes and keeps a segment distance between the second sidewall 212, the arc-shaped guide rail 217 of abutting second sidewall 212 is extended on the top of the first guide rail 215, and this arc-shaped guide rail 217 is protruding toward the direction away from the 3rd sidewall 213; Base plate 210 between second guide rail 216 and the 3rd sidewall 213 is fixed with USB socket 23, this USB socket 23 is blanket socket, its insert port is just to rectangular aperture 218, this insert port is greater than the thickness of the reception of wireless signals end 11 of USB wireless signal receiver 1 to the distance of rectangular aperture 218, and the top of USB socket 23 flushes with the top of the second guide rail 216.
As Fig. 5 coordinates shown in Fig. 3, the lower surface of slide block 243 is provided with the chute 243a matched with first, second guide rail 215,216 on base plate 210, slide block 243 is placed on this first, second guide rail 215,216, bottom is towards the first side wall 211, top towards the second sidewall 212, and can move back and forth between this first, second sidewall 211,212, a depression bar 243b is extended on the top of this slide block 243 between arc-shaped guide rail 217 and USB socket 23, the top of depression bar 243b be provided with the draw-in groove 121 on USB wireless signal receiver 1 with the use of locating piece 243c, the upper surface that this slide block 243 is positioned between the first guide rail 215 and the 4th sidewall 214 is provided with accepting groove, this accepting groove comprises the first conduit 243d be connected successively, second conduit 243e, 3rd conduit 243f, 4th conduit 243g and the 5th conduit 243h, first conduit 243d starts from the bottom of slide block 243, and extend in the top orientation to slide block 243, 4th conduit 243g be arranged in parallel with the first conduit 243d and top flushes, 4th conduit 243g is shorter than the first conduit 243d, the two ends of the 5th conduit 243h are connected respectively with bottom the first conduit 243d with bottom the 4th conduit 243g, 5th conduit 243h and the first conduit 243d crossing formation acute angle, the the second conduit 243e and the 3rd conduit 243f that connect in V-shape is connected with between the middle part of the first conduit 243d top and the 4th conduit 243g, the recess of V word points to the 5th conduit 243h, this the first conduit 243d and the second conduit 243e is formed and ejects conduit, 3rd conduit 243f, 4th conduit 243g and the 5th groove 243h road are formed and slip into conduit, the junction of the 5th conduit 243h and the first conduit 243d is provided with guiding steel disc 243i, and the direction of this guiding steel disc 243i is identical with the direction of the 5th conduit 243h, the top of slide block 243 is provided with state fixed column 243j, and this fixed leg 243j is positioned at the top of accepting groove.
As shown in Figure 3, one end of spring 241 abuts the first side wall 211 of drain pan 21, the other end abuts the bottom of the 5th conduit 243h on slide block 243, the two ends of elastic component 242 are set in the periphery of the fixed leg 219 of base plate and the fixed leg 243j of slide block respectively, provide elastic force for slide block 243 moves back and forth between first and second sidewall 211,221.
During initial position, the top of slide block 243 flushes with the top of the second guide rail 216 on base plate 210, and spring 241 is connected to the bottom of the 5th conduit 243h of slide block 243.
When USB wireless signal receiver 1 inserts, the socket of this USB wireless signal receiver 1 props up the top of slide block 243, promote slide block 243 to move to the first side wall 211, elastic component 242 is stretched, spring 241 is from the bottom of the 5th conduit 243h, under the effect of guiding steel disc 243i, along the 5th, 4th, 3rd conduit 243h, 243g, 243f slides, and be equipped in the recess that the second conduit 243e and the 3rd conduit 243f is V-shape junction, locating piece 243c simultaneously on slide block 243 contacts with arc track 217, under the effect of cross force, depression bar 243b is out of shape to the right, locating piece 243c is driven to embed in the draw-in groove 121 of USB wireless signal receiver 1, the bottom of USB wireless signal receiver 1 is made to keep flushing with the second sidewall 212 on base plate 210.
When USB wireless signal receiver 1 is subject to thrust again, promote slide block 243 to the first side wall 211 movement further, elastic component 242 is stretched further, spring 241 overcomes blocking, now slide block 243 moves to the second sidewall 211 under the pulling force effect of elastic component 242, spring 241 slides to initial position along second, first conduit 243e, 243d, locating piece 243c simultaneously on slide block 243 exits the draw-in groove 121 of USB wireless signal receiver 1, and this USB wireless signal receiver 1 completes automatic spring action.
As shown in Figure 6, brain electro-detection instrument of the present invention, comprise pre-amplification circuit, Anti-aliasing Filter Circuits, a/d converter and analysis computer, described pre-amplification circuit, Anti-aliasing Filter Circuits and a/d converter have 70 respectively, wherein each pre-amplification circuit, an Anti-aliasing Filter Circuits is connected formation one sampling and analog to digital conversion circuit respectively successively with an a/d converter, article 70, sampling and analog to digital conversion circuit are connected in parallel, form 70 circuit-switched data streams, collect circuit by a high-speed data again to accumulate a high-speed data and flow through data transmission circuit and deliver to analysis computer and carry out treatment and analysis.Described data transmission circuit adopts the mode connect into analysis computer of Fiber isolation and USB interface.
Pre-amplification circuit: first EEG signals is incorporated into pre-amplification circuit by the electrode be attached on human body scalp, have a lot of interference and artefact along with EEG signals, these garbage signals are hundreds of even thousands of times larger than useful EEG signals often.This just requires that preamplifier can amplify EEG signals and have again the ability suppressing interfering signal.Therefore the instrument amplifier AD620 of high cmrr and high input impedance is adopted.In order to not allow interfering signal by amplifier saturation, amplifier is applied under being in low gain state, and amplification controls at 5-10 doubly.The dynamic range of input signal can be made like this to expand ± 300mV to.
Anti-aliasing Filter Circuits: in order to the condition making a/d converter circuit working below meet sampling theorem under 10KHz sample rate, the frequency range being input to a/d converter circuit signal must be limited.Present invention employs a step low-pass active filter circuit, by the frequency band limits of output signal to 0 ~ 2000Hz.
A/d converter: the present invention adopts high-precision a/d converter to meet the requirement of differentiating microvolt level signal, and every road adopts the Σ-⊿ type a/d converter ADS1251 of a slice low-cost and high-precision to carry out analog digital conversion.The interchannel that doing so avoids analogue signal switches the detrimental effects brought to Σ-⊿ type a/d converter.Therefore the present invention can make the sampling rate on each road to 10KHz.
High-speed data collects circuit: the present invention adopts a kind of high-speed data to collect circuit, the tidal data recovering that multipath conversion is good is become road data flow at a high speed, inserts synchronizing information, so that computer receives the differentiation of the laggard row of channels of data simultaneously.Be sent to a buffered gate respectively from the 24bit data of each shunt a/d converter sampling, 24bit data can be delivered to 24bit respectively and collect in bus by this buffered gate under the control of gate-control signal.Sequential logical circuit is according to the requirement of frame structure, first from gate-control signal 0 sending control signal, buffered gate is opened in the beginning of every frame, synchrodata is delivered to and collects bus, then sequential logical circuit is sent latch signal and data is loaded in latch/serial shift register, the data speedy carding process in a serial fashion that latch/serial shift register will load under the control of serial clock.After this, gate-control signal sent by the gate-control signal line that the different moment never goes the same way, the buffered gate controlling corresponding road is opened, the sampled data on this road being delivered to collects in bus, then sequential logical circuit is sent latch signal and data is loaded in latch/serial shift register, the data speedy carding process in a serial fashion that latch/serial shift register will load under the control of serial clock.Material is thus formed road data flow at a high speed.So that fiber-optic transfer is connected with computer with by USB interface is convenient.All control signals are all the master clocks based on a 24MHz.
Optical fiber interface: according to the requirement of country to medical apparatus and instruments mandatory standard, the isolation voltage between the electrode contacted with patient and network source must reach more than 4500 volts.The present invention adopts fiber-optic transfer data to make isolation voltage can much larger than the requirement of national standard between amplifier and computer.
Beneficial effect of the present invention is: the present invention can not be subject to the impact of external environment and driver personal behavior, and detection level is accurate, does not rely on the subjective assessment of driver, reaches good Detection results.
Utilize technical solutions according to the invention, or those skilled in the art being under the inspiration of technical solution of the present invention, designing similar technical scheme, and reach above-mentioned technique effect, is all fall into protection scope of the present invention.
Claims (10)
1. the fatigue driving detecting system based on electroencephalogram identification, it is characterized in that, brain wave acquisition unit should be comprised based on the fatigue driving detecting system of electroencephalogram identification, tired EEG signal unit, drive simulating unit, control centre's unit, Real-time Collection EEG signal unit, alarm unit and drive unit in real time;
Brain wave acquisition unit, is connected with tired EEG signal unit and drive simulating unit, for from the tired EEG signal unit of drive simulating state acquisition;
Control centre's unit, with tired EEG signal unit, Real-time Collection EEG signal unit, alarm unit connects, for comparative analysis EEG signal;
Alarm unit, and in real time drives unit and is connected, for transmitting fatigue driving alarm signal;
Real-time Collection EEG signal unit, and in real time drives unit and is connected, for carrying real-time EEG signal.
2., as claimed in claim 1 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, brain wave acquisition unit comprises the marconigram helmet, EEG signal sensor and signal processor.
3., as claimed in claim 2 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that signal processor comprises: multiple frequency converter, it carries out frequency inverted to export switching signal to input signal; And efferent, the described switching signal that its synthesis exports from multiple frequency converter also exports composite signal, multiple frequency converter is formed in monolithic semiconductor chip, and multiple frequency converter carries out frequency inverted to convert the switching signal being in different frequency bands to.
4. as claimed in claim 2 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, each in frequency converter carries out frequency inverted to the signal being in predetermined frequency band as input signal, and exports the switching signal being in more high frequency band than predetermined frequency band;
Also be formed for the synthesis of switching signal in semiconductor chip and export the combining unit of composite signal; Combining unit is the junction point carrying out connecting between each output connecting line of multiple frequency converter;
Each in frequency converter has the amplifier for amplifying switching signal, and at least outlet side place of amplifier in input side and outlet side has inductive load;
In semiconductor chip, be also formed with the multiple P/S transducers for parallel data being converted to serial data, and the serial data as baseband signal exported from one of described P/S transducer for a pair of frequency converter carries out frequency inverted;
Composite signal wirelessly transmits;
Composite signal is transmitted by Medium Wave Guide;
Frequency converter carries out frequency inverted, baseband signal to be converted to the described switching signal that residing frequency band is equal to or higher than 30GHz.
5. as claimed in claim 3 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, the signal processing method of signal processor comprises: carry out frequency inverted to convert the switching signal being in different frequency bands to by multiple frequency converter, and multiple frequency converter is used for carrying out frequency inverted to export switching signal to input signal; Switching signal is exported after the frequency converter by signal processor carries out frequency inverted to described input signal; And the switching signal that synthesis exports from multiple frequency converter is to export composite signal; Wherein, be provided for carrying out frequency inverted to export described multiple frequency converter of switching signal and to export the efferent of composite signal for the synthesis of the switching signal exported from multiple frequency converter to input signal, and multiple frequency converter is formed in monolithic semiconductor chip;
Signal processing method, it comprises: carry out frequency inverted to convert the switching signal being in different frequency bands to by multiple frequency converter, and multiple frequency converter is used for carrying out frequency inverted to export input signal to the switching signal obtained by carrying out frequency inverted to input signal;
At least be dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter; And by frequency converter, frequency inverted is carried out to export described input signal to switching signal, wherein, signal processor be at least dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter, and multiple frequency converter is formed in monolithic semiconductor chip.
6. as claimed in claim 3 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, signal processor, it comprises: multiple frequency converter, it carries out frequency inverted to export input signal to the switching signal obtained by carrying out frequency inverted to input signal, wherein, multiple frequency converter is formed in monolithic semiconductor chip, multiple frequency converter carries out frequency inverted to the switching signal being in different frequency bands, and to be at least dispensing by each in multiple frequency converter synthesize the composite signal that obtains of multiple switching signals that is in different frequency bands for being carried out the switching signal in the frequency band of frequency inverted by frequency converter,
Signal processor, it comprises: multiple first frequency transducer, and it carries out frequency inverted to export switching signal to input signal, and multiple second frequency transducer, frequency inverted is carried out to export input signal to switching signal, multiple first frequency transducer and multiple second frequency transducer are formed in monolithic semiconductor chip, multiple first frequency transducer carries out frequency inverted to convert the switching signal being in different frequency bands to, the switching signal exported from multiple first frequency transducer is synthesized, and export composite signal, multiple second frequency transducer carries out frequency inverted to the switching signal being in different frequency bands, and to each in multiple frequency converter at least distribute from second half conductor chip composite signal at least for being carried out the switching signal in the frequency band of frequency inverted by frequency converter.
7. as claimed in claim 6 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, each in frequency converter is carried out frequency inverted to the switching signal as the signal being in more high frequency band than predetermined frequency band and is exported the signal being in predetermined frequency band;
In semiconductor chip, be also formed with dispenser, dispenser at least distributes the switching signal for being undertaken by frequency converter in the frequency band of frequency inverted to each in described multiple frequency converter;
Dispenser is the junction point carrying out connecting between each input connecting line of multiple frequency converter;
Each in frequency converter has the amplifier for amplifying the signal inputing to frequency converter, and amplifier has inductive load at least input side place of input side and outlet side;
The multiple S/P transducers for serial data being converted to parallel data are also formed in semiconductor chip, and a pair of frequency converter is carried out frequency inverted to convert the serial data as baseband signal to for the switching signal of being undertaken by frequency converter in the frequency band of frequency inverted, and the serial data after frequency inverted is provided to one of S/P transducer;
Composite signal wirelessly transmits; Composite signal is transmitted by Medium Wave Guide;
Frequency converter carries out frequency inverted, converts baseband signal to the switching signal residing frequency band being equal to or higher than 30GHz.
8., as claimed in claim 1 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, alarm unit comprises wireless signal receiver and voice announcer;
Wireless signal receiver, comprise USB plug and be connected to the reception of wireless signals end bottom USB plug, USB plug and reception of wireless signals end wide, wider than Universal USB plug, also be longer than than Universal USB plug, one side of USB plug has rectangle draw-in groove, the base of this draw-in groove to USB plug another side between be provided with data line contact face, the data line contact face in this data line contact face and Universal USB plug is wide;
USB interface comprises drain pan, lid, USB socket and automatic pop-up device, and USB socket and automatic pop-up device are housed in wherein by drain pan and lid cooperation, drain pan comprises base plate, two the first side walls be arranged in parallel and the second sidewall and perpendicular to first, second sidewall and the 3rd sidewall be parallel to each other and the 4th sidewall, second sidewall has a rectangular aperture that can hold USB wireless signal receiver and pass near one end of the 3rd sidewall, base plate is provided with perpendicular to the first side wall and abuts the first guide rail and second guide rail of this first side wall, the top of this first guide rail and the second guide rail flushes and keeps a segment distance between the second sidewall, the arc-shaped guide rail of abutting second sidewall is extended on the top of the first guide rail, this arc-shaped guide rail is protruding toward the direction away from the 3rd sidewall, USB socket is blanket socket, be fixed on the base plate between the second guide rail and the 3rd sidewall, its insert port is just to rectangular aperture, and this insert port is greater than the thickness of the reception of wireless signals end of USB wireless signal receiver to the distance of rectangular aperture, and the bottom of USB socket flushes with the top of the second guide rail,
Automatic pop-up device comprises slide block, elastic component and spring, the lower surface of slide block is provided with and first on base plate, the chute that second guide rail matches, slide block be placed in this first, on second guide rail, bottom is towards the first side wall, top is towards the second sidewall, and this first, move back and forth between second sidewall, a depression bar is extended on the top of this slide block between arc-shaped guide rail and USB socket, the top of depression bar be provided with the draw-in groove on USB wireless signal receiver with the use of locating piece, the upper surface that this slide block is positioned between the first guide rail and the 4th sidewall is provided with accepting groove, this accepting groove comprise slip into conduit and eject conduit, one end of spring abuts the first side wall of drain pan, the other end extends in the accepting groove of slide block, abut the bottom of this accepting groove, the slider top that the two ends of elastic component abut the second sidewall on base plate respectively and are positioned at above accepting groove, provide elastic force for slide block moves back and forth between first and second sidewall,
During initial position, the top of slide block flushes with the top of the second guide rail on base plate, and spring is connected to the bottom of slide block accepting groove;
After USB wireless signal receiver inserts, the socket of this USB wireless signal receiver props up the top of slide block, and locating piece embeds in the draw-in groove of USB wireless signal receiver, makes the bottom of USB wireless signal receiver keep flushing with the second sidewall on base plate;
The top of slide block is provided with state's fixed column, this fixed leg is positioned at the top of accepting groove, base plate between arc-shaped guide rail and the 3rd sidewall is also provided with fixed leg, the two ends of elastic component are set in the fixed leg of base plate and the fixed leg periphery of slide block respectively, provide elastic force for slide block moves back and forth between first and second sidewall;
Accepting groove comprises the first conduit be connected successively, second conduit, 3rd conduit, 4th conduit and the 5th conduit, first conduit starts from the bottom of slide block, and extend in the top orientation to slide block, 4th conduit be arranged in parallel with the first conduit and top flushes, 4th conduit is shorter than the first conduit, the two ends of the 5th conduit are connected with the 4th channel floor with the first channel floor respectively, 5th conduit and the first conduit are connected to form an acute angle, the second conduit and the 3rd conduit that connect in V-shape is connected with between the middle part of the first conduit top and the 4th conduit, the recess of V word points to the 5th conduit, this first conduit and the second conduit are formed and eject conduit, 3rd conduit, 4th conduit and the 5th conduit are formed and slip into conduit, after USB wireless signal receiver inserts, spring is equipped in the recess that the second conduit and the 3rd conduit are V-shape junction,
The junction of the 5th conduit and the first conduit is provided with guiding steel disc, and the direction of this guiding steel disc is identical with the direction of the 5th conduit.
9., as claimed in claim 1 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, described real-time driving unit comprises brain electro-detection instrument and wireless data transmitter;
Brain electro-detection instrument, comprise pre-amplification circuit, Anti-aliasing Filter Circuits, a/d converter and analysis computer, the amplifier in pre-amplification circuit is in low gain state, and amplification controls at 5 ~ 10 times; Described pre-amplification circuit, Anti-aliasing Filter Circuits and a/d converter have several respectively, wherein each pre-amplification circuit, an Anti-aliasing Filter Circuits are connected formation one sampling and analog to digital conversion circuit respectively successively with an a/d converter, some samplings and analog to digital conversion circuit are connected in parallel, form some circuit-switched data stream, then collect circuit by a high-speed data and accumulate a high-speed data and flow through data transmission circuit and deliver to analysis computer and carry out treatment and analysis;
Described high-speed data collects that circuit comprises master clock, sequential logical circuit, collects bus, latch/serial shift register and several buffered gates; The data of sampling are delivered to a buffered gate by each bar sampling and analog to digital conversion circuit respectively; Described sequential logical circuit, based on described master clock, according to the requirement of frame structure, gate-control signal is sent by the gate-control signal line that the different moment never goes the same way, and controls corresponding buffered gate and opens, the sampled data on this road delivered to and collect in bus; After sampled data on Mei Tiao road is sent to and collects bus, described sequential logical circuit is all sent latch signal to described latch/serial shift register and is loaded in described latch/serial shift register by data, and the data of loading are exported formation high-speed data-flow in a serial fashion by described latch/serial shift register under the control of serial clock;
Sampling and analog to digital conversion circuit have 70, form 70 data flow path;
Data transmission circuit adopts the mode connect into analysis computer of Fiber isolation and USB interface;
Pre-amplification circuit adopts the instrument amplifier AD620 of high cmrr and high input impedance;
Anti-aliasing Filter Circuits is step low-pass active filter circuit;
A/d converter adopts Σ-⊿ type a/d converter ADS1251.
10., as claimed in claim 1 based on the fatigue driving detecting system of electroencephalogram identification, it is characterized in that, control centre's unit is specifically provided with the processor of S3C2440A model; Voice broadcast implement body is provided with the speech chip that model is WT588D-20SS; Brain electro-detection instrument specifically adopts sample frequency to be the Emotiv electroencephalogramdata data collector of 128HZ.
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