CN203555744U - Brain electric polygraph provided with multi-functional display screen - Google Patents

Abstract

The utility model relates to a brain electric polygraph provided with a multi-functional display screen. The brain electric polygraph comprises a housing used for installation and fixation, a brain electrode, a brain electric signal acquisition and switching circuit and a computer. The brain electrode which is disposed on scalps of a tested person is connected with the brain electric signal acquisition and switching circuit via a shielded wire and then is connected with the computer. A projector and an earphone are connected with the computer. The brain electric signal acquisition and switching circuit is formed in such a way that a pre-amplifier, a trap filter, a high pass amplifying filter, a low pass amplifying filter and an A / D converter are sequentially connected. An input end of the brain electric signal acquisition and switching circuit is connected with the brain electrode. An output end of the A / D converter is connected with a single-chip microcomputer via a USB bus. The display screen is arranged on the housing and is connected with the computer. The brain electric polygraph provided with the multi-functional display screen is simple in structure, high in credibility, small in size of a finished product and low in production cost and is handy and is easy to carry and is broadly suitable for various industries.

Description

There is the brain electricity psychological tester of Multi-Function Display

[technical field]

This utility model relates to psychological tester field, particularly a kind of brain electricity psychological tester that has Multi-Function Display, can show multinomial real time data.

[background technology]

Psychological tester claims again a lie detector (Polygraph), is a kind of instrument that records multinomial physiological reaction, can be used for assisting investigation in crime survey, is subject to inquisitorial psychologic status, thereby judges whether it relates to punishment case to obtain.Its principle is based upon people can there are a series of variations that can not automatic control on physiology when lying, comprise the physiological situation that some are difficult to observe with the naked eye, such as breathing rate and blood volume are abnormal, pulse quickening, hypertension, blood output increases and composition variations, subcutaneous sweat gland secretion increase, platycoria, stomach contraction and/or muscular tone etc.

Modern a lie detector is comprised of sensor, main frame and microcomputer conventionally.Wherein, sensor is connected with people's body surface, for gathering the change information of Human Physiology parameter; Main frame is electronic unit, and the analogue signal that sensor is gathered converts digital signal to through processing; Microcomputer is stored the digital signal of input, analyze, show, obtains conclude of lie detector.

Scientific research is found, P300 ripple (ERP current potential) is a main endogenous component relevant to psychological factor, also claim meaning ripple and understand ripple, P300 existing oneself to be recognized be research people's cognitive activities and the useful indicators that judges people's cognitive competence, the all reflections to some extent on P300 of stimulus object and subjects's stake and subjects's emotion, and these variations of P300 are that subjects is uncontrollable.P300 has become the main component of carrying out psychological test with brain wave, and this is the once breakthrough of contemporary psychological test research.

But applicant finds, after need to being connected with computer mostly, could use existing brain electricity psychological tester, by computer screen, show the curve of various parameters and physiology passage, portability or mobility that this has reduced tester, also caused not convenient while using.

[summary of the invention]

[technical problem that will solve]

The purpose of this utility model is to address the deficiencies of the prior art, and provides one to have display screen, can show in real time multinomial measured data, uses more convenient brain electricity psychological tester.

[technical scheme]

To achieve these goals, this utility model is for a kind of brain electricity psychological tester with Multi-Function Display, comprise for fixing housing, brain electrode, the collection of brain electricity and change-over circuit and computer are installed, brain electrode on the described experimenter's of being placed on scalp is connected with change-over circuit with eeg signal acquisition by shielding line, be connected to computer, described projector is connected with computer with earphone, and described brain electricity number gathers with change-over circuit and is linked in sequence and formed by preamplifier, wave trap, high pass amplifilter, low pass amplifilter and A/D converter; EEG signals Bian collection is connected described brain electrode with the input of change-over circuit, and the outfan of A/D converter is connected with single-chip microcomputer by usb bus, and wherein, described housing is provided with display screen, and described display screen is connected with computer.

By brain electro-detection, carrying out psychological test is state of the art, and it detects principle and means a large amount of open source literature itemized record, brain electrode (sensor) used be also this area conventional, the product that can buy acquisition on market.

According to a kind of preferred implementation of above-mentioned brain electricity psychological tester, described display screen is OLED display screen, TFT-LCD display screen or PLED display screen.

OLED display screen is a kind of organic electric exciting light-emitting diode (OrganicLight-Emitting Diode), possess self-luminous,, thin thickness high without backlight, contrast, visual angle is wide, response speed is fast, power consumption is little, can be used for flexibility panel, serviceability temperature scope is wide, structure and the feature such as processing procedure is simpler, is widely used in the products such as mobile phone, media player and small-sized entry level TV the most remarkable.

TFT-LCD display screen is TFT LCD (Thin Film Transistor LCD), is a kind of active matrix type liquid crystal display (AM-LCD).The combination properties such as its brightness, contrast, power consumption, life-span, volume and weight are obviously better than CRT monitor part, have the features such as function admirable, large-scale production characteristic is good, automaticity is high, product is cheap.

PLED(polymer light-emitting diode) display screen is a kind of polymer LED display screen, having the advantages such as self-luminous, high brightness, wide viewing angle, low power consuming, thickness ultrathin, is at a low price a kind of and multiduty portable displayer technology.

Preferably, described computer comprises data communication module, ERP extraction and analytical system, expert judging system and stimulates generation systems; Wherein, input termination data communication module, data communication module extracts with ERP and analytical system is electrically connected, ERP extraction and analytical system respectively with expert judging system with irritate generation systems and be connected, expert judging system is connected with display, stimulates generation systems to have outfan.

According to the optional embodiment of one, computer of the present utility model can be by single-chip microcomputer and Implementation of Embedded System.

Preferably, described outfan is USB port, bluetooth port, infrared data port or universal serial bus.

In this utility model, on described display screen, have stimulus information, comprise Show Picture, the stimulus such as video, word, also for showing the current physiological status of testee.

Preferably, described brain electricity psychological tester also comprises the earphone of playing stimulus information

According to one of the present utility model preferred embodiment, described impedance matching circuit can be voltage follower circuit; Described filtering and amplifying circuit can be in-phase proportion amplifier.These circuit are technology well known to those skilled in the art, also can directly buy from the market acquisition.

In this utility model scope, term " computer " comprises general purpose computer and is arranged on the necessary software in described computer, the function that it can be realized comprises the output signal receiving from psychological tester, these output signals are presented in display device with curve or diagrammatic form, for staff, evaluate tested person's mental status.Described computer and related software are prior art, and those skilled in the art can not pay creative work and realize.In this utility model, repeat no more.

As the optional embodiment of one, this utility model brain electricity psychological tester adopts the methods such as wavelet transformation and independent component analysis, and the testing time shortens, and signal extraction is effective, simple to operate.

This utility model brain electricity psychological tester can be used for public security organs, procuratorial organs and people's court office case investigation, also can be applicable to the application and research of the aspects such as neurological, neuropsychology, cognitive psychology, engineering psychology, criminal psychology.

During operation, user only need switch on power, and to measured, is with upper brain electric transducer, and each passage physiological parameter curve of measured just reflects by Multi-Function Display.Main survey person can judge measured's mental status by these signals.

[beneficial effect]

Brain electricity psychological tester of the present utility model is owing to having Multi-Function Display, can Show Picture, the stimulus such as video, word, also show and measured's current physiological status therefore can not connect other equipment (as host computer), can independent operation, there is certain movement and portability.

This utility model is simple in structure, little, the light portable of finished-product volume, and manufacturing cost is lower, is extensively suitable for multiple industry.

[Figure of description]

Fig. 1 is modular structure schematic diagram of the present utility model;

Fig. 2 is operating process schematic diagram of the present utility model.

[specific embodiment]

By this utility model specific embodiment given below, can further be expressly understood this utility model, but these embodiment not the restrictions to protection domain.

Connected successively preamplifier, wave trap, high pass amplifilter, low pass amplifilter and A/D converter are installed in housing, wherein EEG signals Bian collection is connected described brain electrode with the input of change-over circuit, the outfan of A/D converter is connected with single-chip microcomputer by usb bus, wherein, described housing is provided with display screen, and described display screen is connected with computer.Brain electrode is placed on experimenter's scalp, by shielding line, is connected with change-over circuit with eeg signal acquisition, is connected to computer, and described projector is connected with computer with earphone.

Eeg signal acquisition and change-over circuit performance indications are as follows:

Short circuit input noise: be less than 0.7 μ V peak-to-peak value

Band system band: 0.5～40Hz

50Hz trap: decay is not less than 60dB (± 0.5Hz)

Input impedance: can realize and be greater than 10 ¹⁰Ω

Amplification: can realize more than 50000 times, adjustable

Common mode rejection ratio: be not less than 110dB

Bian sample frequency: every helical pitch is 256Hz

Electrode lead mode: unipolar lead, bipolar lead is optional

Each interchannel isolation: be not less than 100dB

Wherein the method for testing of interchannel isolation is: two input short circuits of (1) each passage preamplifier altogether, the peak-to-peak value that records each passage short circuit output noise is Ai(i=1, n) (2) retain the short circuit of i passage input altogether, other passage is by regulating input signal, it is exported in full width duty, and record its peak-to-peak value P, record the peak-to-peak value Ai ' of i passage output signal simultaneously

(3) substitution formula then:

Interchannel isolation=(20 × log (A ' _i-A _i/ P)) dB

(4) same method is tested other each passage;

In described brain electricity psychological tester, the extraction of ERP current potential (P300) adopts normal signal processing method---wavelet transformation and independent component analysis method.

Subjects is at be upset (picture, word, video etc.), and brain is inevitable movable, i.e. endogenous ERP potential change, and this current potential is relevant with people's the cognitive psychological course of processing, irrelevant with the physical parameter that event stimulates.It is that testee self is uncontrollable that this E.E.G changes.

Visible, the brain electricity psychological tester with Multi-Function Display of the present utility model is simple in structure, with a high credibility, finished-product volume is little, light portable, and manufacturing cost is lower, is extensively suitable for multiple industry.

Claims (6)

1. one kind has the brain electricity psychological tester of Multi-Function Display, comprise for fixing housing, brain electrode, the collection of brain electricity and change-over circuit and computer are installed, brain electrode on the described experimenter's of being placed on scalp is connected with change-over circuit with eeg signal acquisition by shielding line, be connected to computer, described projector is connected with computer with earphone, and described brain electricity number gathers with change-over circuit and is linked in sequence and formed by preamplifier, wave trap, high pass amplifilter, low pass amplifilter and A/D converter; EEG signals Bian collection is connected described brain electrode with the input of change-over circuit, and the outfan of A/D converter is connected with single-chip microcomputer by usb bus, it is characterized in that described housing is provided with display screen, and described display screen is connected with computer.

2. the brain electricity psychological tester with Multi-Function Display according to claim 1, is characterized in that described display screen is OLED display screen, TFT-LCD display screen or PLED display screen.

3. the brain electricity psychological tester with Multi-Function Display according to claim 1, is characterized in that described computer comprises data communication module, ERP extraction and analytical system, expert judging system and stimulates generation systems; Wherein, input termination data communication module, data communication module extracts with ERP and analytical system is electrically connected, ERP extraction and analytical system respectively with expert judging system with irritate generation systems and be connected, expert judging system is connected with display, stimulates generation systems to have outfan.

4. the brain electricity psychological tester with Multi-Function Display according to claim 1, is characterized in that described outfan is USB port, bluetooth port, infrared data port or universal serial bus.

5. the brain electricity psychological tester with Multi-Function Display according to claim 1, is characterized in that there is stimulus information on described display screen.

6. the brain electricity psychological tester with Multi-Function Display according to claim 1, is characterized in that described brain electricity psychological tester also comprises the earphone of playing stimulus information.

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