CN201051742Y - Examination room and conference room detection prevention shielding scheduling combiner - Google Patents
Examination room and conference room detection prevention shielding scheduling combiner Download PDFInfo
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- CN201051742Y CN201051742Y CNU2007201438659U CN200720143865U CN201051742Y CN 201051742 Y CN201051742 Y CN 201051742Y CN U2007201438659 U CNU2007201438659 U CN U2007201438659U CN 200720143865 U CN200720143865 U CN 200720143865U CN 201051742 Y CN201051742 Y CN 201051742Y
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Abstract
The utility model relates to a detecting, screening, and wireless dispatching device which is used for monitoring examination rooms and meeting places, and preventing relevant people utilizing audio visual devices to cheat or fraud, in particular to an anti-detecting screening dispatching unit machine used in examination rooms and meeting places. The utility model comprises two separate portions of a wireless hidden earphone detector (the followings are called A machine for short) and a wireless communication signal screening machine (the followings are called B machine for short). The A machine works adopting hand-held or moving style, and the B machine sends wireless disturbance signal wave adopting a fixed position and works. The utility model can directly detect the position of a cheating earphone, and overcomes the shortcoming of wrong report, simultaneously, because of the excellent wireless signal-screen function, the utility model can prevent and restrict cribbers in examination rooms and people who breach the confidence on multi-layer, and has active screening cooperative working effect, and can well communicate with dispatchers under the circumstances that dispatching working staffs by shouting directly is not convenient.
Description
Technical field
The utility model is a kind ofly to be used to monitor that examination hall, meeting-place prevent detection, shielding and wireless dispatching device that the related personnel utilizes the audio-visual apparatus cheating or practices fraud, particularly a kind of examination hall, meeting-place technical precaution detector shield scheduling unit mahine.
Background technology
Along with development of science and technology, some advanced audio-visual apparatuss are abused the cheating or the malpractices in examination hall or meeting-place, have destroyed the sacred and solemn of examination hall or meeting-place.For example have some students to realize the voice cheating by plug into all kinds of communication apparatus or recording pen etc. of wireless concealed earphone now, take an examination, be grown up in national English Test (Band 4 and 6) examination, the postgraduate qualifying examination etc. of this type of phenomenon are of common occurrence.Traditional examination hall, meeting-place technical precaution equipment can't the detection wireless concealed earphones, can't locate it, and the situation of wrong report is often arranged, and caused and used spreading unchecked of wireless concealed earphone cheating in the examination hall.And the wireless concealed earphone detector that has occurred in the market, but because of its principle is simple, function singleness, power consumption is bigger, is unfavorable for environmental protection, so can not get promoting; Because it is single that this series products can be surveyed the kind of earphone, also caused the appearance of multiple anti-detection wireless concealed earphone.In addition, under the special like this environment in examination hall and meeting-place, be very out of season by the mode dispatcher who propagandas directed to communicate, and in the market not cheaply the wireless dispatching product be used for this field.
Summary of the invention
The purpose of this utility model is in order to overcome prior art the defective of wrong report also often to be arranged to wireless concealed earphone location, and existing product can't be realized wireless telecommunications cheating instrument is effectively shielded in the detection wireless concealed earphone, and in a kind of can being widely used in all kinds of examinations and the momentous conference that inconvenience is invented under directly by the situation of carrying out personal scheduling of propagandaing directed to communicate, have generally anti-cheating, anti-divulging a secret surveyed and examination hall, the meeting-place technical precaution detector shield scheduling unit mahine of wireless communication tool function of shielding.
The purpose of this utility model realizes as follows: examination hall described in the utility model, meeting-place technical precaution detector shield scheduling unit mahine comprise two separate parts of wireless concealed earphone detector (hereinafter to be referred as the A machine) and wireless communication signal shielding device (hereinafter to be referred as the B machine); The A machine adopts the mode of handing to move to carry out work, and the B machine adopts the mode of fixed position emitting radio wave to carry out work.Detector and shielding device are remedying on two functions, because detector can only work to concealed earphone, and the shielding device just can work to wireless communication tool such as mobile phones, and both cooperate, and are flawless.To be designed to the form of A, B machine thus, attractive in appearance like this, and be a kind of trend.In addition, the purpose of examination hall technological prevention is not for the cribber being restrained by law, never get up again, but avoids the cribber to practise fraud to greatest extent, builds fair examination scope.And detector is because initiative is too strong, specific aim is very strong during detection, really catch too many cribber during examination to student or all bad to school, so also need a kind of more passive relatively equipment, mainly be the instrument of shielding foreign exchanges, as mobile phone, like this, the student can't link up with the external world, and concealed earphone just can not be used to a certain extent.But, mobile phone shielding device can't shield some private frequency modulation equipments of making, and recording pen, the so independent cheating instrument of MP3, MP4, and these instruments just can work after still plugging into concealed earphone, so this concealed earphone detector also still plays effect in a way.In a sense, the actual purpose that detector and shielding device are worked together is not to have the people of cheating purpose to check out one by one, but allows them can not do fraud.The people who so for example adds the concealed earphone cheating by mobile phone, just muddled for the moment mostly, they just can not do fraud, equally can protect them can not be detected out yet.And the sort of must the cheating, and the cheating purpose is very clear and definite, and the more abominable cribber of cheating plot just grabs out and transfers relevant departments and handles with detector.
Described A machine is made up of electromagnetic induction signal collector, signal acquisition circuit, signal processing and analysis module, gain-adjusted control module, power analysis and control module, light-emitting diode display, LED output control module, audio optimization and output circuit, standard audio output interface, kernel control chip, control panel, external charger, lithium battery; The electromagnetic induction signal collector sense the cheating concealed earphone to the variation that electromagnetic wave produced on every side after, produce induced electromotive force in the coil of collector and produce the induced current that changes with electromagnetic wave, carry out signals collecting through signal acquisition circuit, by signal processing and analysis module this induced current is analyzed, this module restores the speech sound waves of being caught, the big young pathbreaker of its signal strength signal intensity and acoustic pressure obtains and analyzes by the LED output control module and exports on the LED display, after the processing of sound wave gain-adjusted control module, export with the volume that the user wishes; Audio signal through the output of gain-adjusted control module is passed through the audio optimization output circuit, reject the interference of environmental noise and other electric equipments, obtain higher signal to noise ratio and comparatively pure acoustic signals, export plug into common insert earphone, sound pick-up outfit, loud speaker by the audio output interface of standard at last; Power analysis and control module are analyzed the current electric quantity surplus, and demonstration can be provided, and send warning when electric weight is low.
Described B machine is made of power supply, soft-start circuit, booster circuit, low-frequency oscillatory network, frequency sweep data generator, high-frequency oscillating circuits and a transmitter module.It during the work of B machine operation principle at wireless telecommunications system, in the certain frequency scope, the B machine can in from the low side frequency to high-end scan round, this scanning can form mess code and disturb in the mobile phone received signal, mobile phone can not detect the normal data of sending from the base station, mobile phone can not be set up with the base station connect.Mobile phone shows as phenomenons such as search network, no signal, no service system, mobile phone can't be used, thereby reach shield effectiveness.The realizing method of function is: power supply is the each several part circuit supply after the soft-start circuit time-delay, the low-frequency square-wave of low-frequency oscillatory network output connects the input of frequency sweep data generator, the sawtooth waveforms that the frequency sweep data generator produces is through the frequency of oscillation modulated terminal of output access at high-frequency oscillating circuits, and the high-frequency signal after the modulation scans about frequency of heart therein and moves.The frequency of oscillation modulated terminal that booster circuit connects high-frequency oscillating circuits is its power supply, and module is penetrated in the output sending and receiving of high-frequency oscillating circuits 20, sends by antenna after its power amplification.The B machine can receive the wireless signal of communication apparatus such as particular place mobile phone and disturb, and realizes shielding, can realize signal shielding fully in design section of the existing mobile phone of China.
Good effect of the present utility model is as follows: the utility model can accurately detect the orientation of cheating earphone, has overcome the defective of wrong report; Simultaneously, on a plurality of aspects, examination hall cribber and meeting-place blabber are taken precautions against and restrict, have active probe and initiatively shield the effect of collaborative work because good wireless signal function of shielding is arranged; And directly undertaken under the situation of personal scheduling by propagandaing directed to communicate in inconvenience, also can be well and the scheduler communicate information.
Description of drawings
Fig. 1 is an A machine circuit block diagram
Fig. 2 is a B machine circuit block diagram
Fig. 3 is an A machine circuit schematic diagram
Fig. 4 is magnetic metal detection circuit figure
Fig. 5 is a B machine circuit schematic diagram
Among the figure, 1 electromagnetic induction signal collector, 2 signal acquisition circuits
3 signal processing and analysis module 4 gain-adjusted control modules
5 power analysis and control module 6 wireless dispatching receiving processing modules
9 audio optimization and output circuit 10 standard audio output interfaces
11 kernel control chips, 12 control panels
13 external charger 14 lithium batteries
15 power supplys, 16 soft-start circuits
17 booster circuits, 18 low-frequency oscillatory networks
19 frequency sweep data generators, 20 high-frequency oscillating circuitss
21 transmitter modules
Embodiment
Described examination hall, meeting-place technical precaution detector shield scheduling unit mahine comprise two separate parts of wireless concealed earphone detector (hereinafter to be referred as the A machine) and wireless communication signal shielding device (hereinafter to be referred as the B machine); The A machine adopts the mode of handing to move to carry out work, and the B machine adopts the mode of fixed position emitting radio wave to carry out work.
As shown in Figure 1, described A machine is made up of electromagnetic induction signal collector 1, signal acquisition circuit 2, signal processing and analysis module 3, gain-adjusted control module 4, power analysis and control module 5, light-emitting diode display 7, LED output control module 8, audio optimization and output circuit 9, standard audio output interface 10, kernel control chip 11, control panel 12, external charger 13, lithium battery 14; Electromagnetic induction signal collector 1 sense the cheating concealed earphone to the variation that electromagnetic wave produced on every side after, produce induced electromotive force in the coil of collector 1 and produce the induced current that changes with electromagnetic wave, carry out signals collecting through signal acquisition circuit 2, analyze by signal processing and 3 pairs of these induced currents of analysis module, this module 3 restores the speech sound waves of being caught, the big young pathbreaker of its signal strength signal intensity and acoustic pressure obtains and analyzes by LED output control module 8 and exports on the LED display 7, after 4 processing of sound wave gain-adjusted control module, export with the volume that the user wishes; Audio signal through 4 outputs of gain-adjusted control module is passed through audio optimization output circuit 9, reject the interference of environmental noise and other electric equipments, obtain higher signal to noise ratio and comparatively pure acoustic signals, export plug into common insert earphone, sound pick-up outfit, loud speaker by the audio output interface 10 of standard at last; Power analysis and control module 5 are analyzed the current electric quantity surplus, send warning when electric weight is low.
Described A machine, can also be designed to take the initiative and survey and the passive detection dual mode carries out the detection of the wireless concealed earphone of advanced electronic class, the function of its active probe, comprise the multiband radiating circuit, audio-frequency electric magnetic wave emission element, audio-frequency electric magnetic wave receiving circuit, frequency selection circuit, multiband radiating circuit wherein, export the audio drive signals under the multiple frequency range, by audio-frequency electric magnetic wave emission element, be subjected to the driving of the audio drive signals that frequency fixing emitting circuit sends, the transmitting audio frequency electromagnetic wave, at last by audio-frequency electric magnetic wave receiving circuit, reception by active class concealed earphone under above-mentioned audio-frequency electric magnetic wave drives, produced to the extraradial sound wave of ear, and convert thereof into the signal of telecommunication, pass through frequency selection circuit at last, its input links to each other with the output of sound wave receiving-member, and its activation frequency and frequency fixing emitting circuit simultaneously or alternately the audio-electromagnetically wave frequency of emission are identical.The way of passive detection is controlled by single-chip microcomputer for only to adopt demodulator circuit to carry out the signal scanning of full frequency band.
Described A machine also includes wireless dispatch system receiving processing module 6, electromagnetic induction signal collector 1 and signal acquisition circuit 2 are with the scheduling signals that receives, be transferred to wireless dispatch system receiving processing module 6 handle and and output to gain-adjusted control module 4, regulate by the volume of 4 pairs of receptions of gain-adjusted control module.Described scheduling signals, be to connect up by a engineering to realize to the examination hall, be copper conductor with two cores along the examination hall or the outside in meeting-place around two to three circles, when the dispatcher sends the voice scheduling instruction, the sound wave of voice can become the signal of telecommunication by power amplification device to be transmitted in 2 core leads, sound wave can produce suddenly big or suddenly small electric current in lead, and the electric current that changes like this will produce the electromagnetic field that thereupon changes, the intra-zone that two core leads are enclosed all can form the electromagnetic field that changes with sound wave, the electromagnetic field of this variation will directly act on the A machine, make the invigilator personnel obtain schedule information.In the place of being inconvenient to connect up, we can also provide a kind of way of the FM of being similar to broadcast radio reception principle, and the wireless dispatching function also can emission of radio audio frequency frequency modulation and the realization of reception operation principle.
Described power analysis and control module 5, signal processing and analysis module 3, wireless dispatch system receiving processing module 6, LED output control module 8 and gain-adjusted control module 4 can be by kernel control chip 11 unified controls; Single-chip microcomputers such as the model of kernel control chip 11 can be 8051,8086, EM78P153S.
As shown in Figure 3, be a solution that described utility model A machine adopts, adopted the EM78P153S processor here, be because it is the single-chip microcomputer of 8 of a high speeds with low-power consumption and 15 option bit, satisfied basic design requirement.Here use 1,2,3 of EM78P153S, the LED display lamp that EM78P153S is drawn in the left side among 4 stitch and the figure links to each other, form LED display 7 by this and a LED lamp,, realize the function of LED output control module 8 by EM78P153S control by the flashing light control program of having finished; 5,6,7 stitch and R24, R25 links to each other, and by R25 ground connection, low-voltage state is judged in 5,6 front lines, realizes the function of power analysis and control module 5; 8,9,10 stitch such as grade are realized the function of gain-adjusted control module 4; Signal processing and analysis module 3, in this scheme, the function of wireless dispatch system receiving processing module 6 do not realize by EM78P153S, but directly utilized the detection wireless concealed earphone signal acquisition circuit 2, realized simple wireless dispatch system receiving function.TDA2822M aly is optimized the IC of processing to sound among the figure, the function of voice optimization and output circuit 9, have highly sensitive, low in energy consumption, voltage range wide (1.8V-15V), advantages such as peripheral cell is few, noiseless.
As shown in Figure 4, be provided with the magnetic metal detection circuit in the described A machine, the magnetic metal detection circuit is a power amplification circuit, the metallicity material is to electromagnetic influence on every side, amplified by the magnetic metal detection circuit, the signal that is exaggerated is transferred to standard audio output interface 10 by electromagnetic induction signal collector 1 makes it send warning.
Determine the emission of wireless signal because of the operation principle self of wireless concealed earphone, its electromagnetic wire is level almost when remote, so when long-range detection, when electromagnetic wire directly passes the magnetic core of electromagnetic induction signal collector 1, inductive effects is best, so equipment has tangible direction directive property, and direction indication is and is detected equipment place direction, the use of equipment has tangible directivity, needs horizontal positioned to survey.
As shown in Figure 2, described B machine is made of power supply 15, soft-start circuit 16, booster circuit 17, low-frequency oscillatory network 18, frequency sweep data generator 19, high-frequency oscillating circuits 20 and a transmitter module 21.It during the work of B machine operation principle at wireless telecommunications system, in the certain frequency scope, the B machine can in from the low side frequency to high-end scan round, this scanning can form mess code and disturb in the mobile phone received signal, mobile phone can not detect the normal data of sending from the base station, mobile phone can not be set up with the base station connect.Mobile phone shows as phenomenons such as search network, no signal, no service system, mobile phone can't be used, thereby reach shield effectiveness.The realizing method of function is: power supply 15 is the each several part circuit supply after soft-start circuit 16 time-delays, the low-frequency square-wave of low-frequency oscillatory network 18 outputs connects the input of frequency sweep data generator 19, the sawtooth waveforms that frequency sweep data generator 19 produces is through the frequency of oscillation modulated terminal of output access at high-frequency oscillating circuits 20, and the high-frequency signal after the modulation scans about frequency of heart therein and moves.The frequency of oscillation modulated terminal that booster circuit 17 connects high-frequency oscillating circuits 20 is its power supply, and module 21 is penetrated in the output sending and receiving of high-frequency oscillating circuits 20, sends by antenna after its power amplification.The B machine can receive the wireless signal of communication apparatus such as particular place mobile phone and disturb, and realizes shielding, can realize signal shielding fully in design section of the existing mobile phone of China.
Here, high-frequency oscillating circuits 20 and connected transmitter module 21 have some groups, and at the communication apparatus of different center frequency, the sawtooth waveforms that the frequency sweep data generator produces also inserts respectively through output respectively.The swept-frequency signal source circuit produces the sawtooth signal of certain frequency and amplitude, send to the modulation high-frequency oscillating circuits, high-frequency signal after the modulation scans about frequency of heart therein and moves, by transmitter module power amplification separately, after launching by antenna, to be received by near mobile phone, and form overlapped signal and make wireless telecommunications system such as mobile phone be in busy state and can not use.Booster circuit 17 in the B machine in addition, its output connects the frequency of oscillation modulated terminal of high-frequency oscillating circuits 20, makes back level oscillating circuit produce bigger offset frequency.And power supply 15 incoming ends of B machine are equipped with soft-start circuit 16, and purpose is that the protection late-class circuit is avoided causing puncture because of the impact of power supply 15.After the B machine energized, inner soft-start circuit 16 work, working power stablize r and is protected amplifying circuit to cause puncture because of the power supply impulse from above freezing being raised in several seconds.
At present the existing mobile phone frequency of China is divided into 800MHz, 900MHz and 1800MHz, 1900MHz two parts, transmitter module of every partial common.As shown in Figure 5, power supply adds by J1, and soft-start circuit 16 is made up of resistance R 1, relay K 1, diode D1, triode Q1, resistance R 2 and capacitor C 4.The shielding device to circuit supply, passes through resistance: R2 to capacitor C 4 charging by current-limiting resistance R1 simultaneously after energising, greatly in 4 seconds of design parameter regulation, and triode Q1 conducting, relay K 1 adhesive, supply voltage reaches stable output.
Booster circuit 17 is made up of resistance R 3, R8, R19, the integrated package D2 that boosts, inductance L 2, diode D3, triode Q2, capacitor C 7, c8, C10.Boost integrated package D2 2 pin for the input, 5 pin for output.When input+5V, can be raised to voltage+15v by the integrated package D2 that boosts, satisfy the demanding bias voltage of variable capacitance diode D4, D5, make back level vibration that bigger frequency deviation be arranged, triode Q2 plays and expands the stream effect, and resistance R 19, R8 provide Voltage Feedback to detect for 1 pin of the integrated D2 that boosts.Capacitor C 10, C8 are output filtering, stablize 15V output.
Low-frequency oscillatory network 18 is made up of resistance R 16, R17, time-base circuit, capacitor C 22, C23, C24, C46.The low-frequency oscillation frequency is by resistance R 17, electric capacity 046 decision.Time-base circuit is selected NE555 for use, its 3 pin output low frequency square wave.Integrated package D8 and R18 are the square wave tooth wave conversion circuit of crouching, the 13 pin input square-wave signal of integrated package D8,8 pin and 10 pin output sawtooth signal, divide two-way to deliver to the variable capacitance diode D4 of subordinate, D5, variable capacitance diode D4, D5 bias voltage are also changed with sawtooth voltage, thereby make the frequency of oscillation of back level oscillating circuit produce change.
Because the mobile phone that China uses now mainly is CDMA800, GSM900, DCS1800, PCS1900, Personal Handyphone System, frequency is mainly at 800MHz, 900MHz, 1800MHz, 1900MHz, high-frequency signal is produced by voltage controlled oscillator, circuit is made up of three parts, 800MHz section, 900MHz section, 1800MHz section.The 800-f1z section is made up of resistance R 4, R5, R6, Rg, R20, R24, inductance L 3, L4, L5, triode Q3, capacitor C 9, C12, C13, C14, C37, C38, C40, C41, variable capacitance diode D4.The biasing of variable capacitance diode D4 by R4, R5, R20,1121 and sawtooth waveforms export and control, R6, R9 are the biasing resistor of oscillating tube Q3, L5, C38, C40, C37, C41, Q3, R24 are oscillation circuit, produce the output of 800MHz high-frequency signal.The circuit structure of 900-1Hz section as above repeats no more.1800 delete the z section is made up of resistance R 7, R12, R23, R26, R28, R29, R 32, inductance L 8, L10, L13, triode Q4, capacitor C 11, C17, C13, C47, C48, C49, C50, C52, C53, C54 and variable capacitance diode D5.The biasing of variable capacitance diode D5 is exported by R26, R28, R7, R29 and sawtooth waveforms and is controlled, and R32, R12 are the biasing resistor of oscillating tube Q3, and L10, C17, C49, C50, C54, Q4,1t23 are oscillation circuit, produces the output of 1800MHz high-frequency signal.This signal is amplified by the Q6 triode again, and R33 is the upper offset resistance of Q6, and signal is by capacitor C 39 coupling outputs, and the offset frequency scope of this high-frequency signal can comprise 1900MHz.
Modular structure is adopted in power amplification, and 800MHz signal and 900MHz signal share an amplification module Q5.Select PF01420 for use, signal is imported by 1 pin, and 3 pin are bias voltage, and 4 pin are power supply, and 5 pin directly are sent to antenna for output.1800MHz uses an amplification module C45 separately, can select PF041 10 for use, and its tranmitting frequency comprises 1800MHz and the shared frequency of 1900MHz mobile phone, the signal of amplification module CA5 is imported by 3 pin, and 1 pin is a bias voltage, and 4 pin are power supply, 6 pin directly are sent to antenna for output.
During use, the A machine places on one's body the staff in examination hall and meeting-place, the control panel 12 of user's operation A machine, long by starting shooting key after 3 seconds, give power devices by power analysis and control module 5, starting device, and by the program of kernel control chip 11 according to the inside establishment, cooperated with LED output control module 8 carries out System self-test, exports demonstration by light-emitting diode display 7, enter the life's work state then, promptly wireless concealed earphone is surveyed and the schedule information accepting state.The A machine has tangible direction directive property in design, and the direction of arrow shown in the equipment can accurately be indicated the orientation of periphery cheating earphone.
The B machine is put in the somewhere in examination hall or meeting-place, and more than 1.5 meters, requirement can effectively shield the communication apparatus in the certain distance in its visual coverage to the suggestion placement location apart from ground, is generally the visual range zone of 30 meters radiuses, about transmitting power 500mW.
In the production process, A machine described in the utility model and B machine can be designed to the pattern of composite aircraft (unit mahine), attractive in appearance to arrange in pairs or groups, B machine inside is provided with transforming circuit, and it can be charged for the A machine.
In the practical application, A machine described in the utility model and B machine can work independently, and are independent of each other.The client also can select independent A machine or B machine according to self economy and operating position.
Claims (6)
1. an examination hall, meeting-place technical precaution detector shield are dispatched unit mahine, it is characterized in that: described examination hall, meeting-place technical precaution detector shield scheduling unit mahine comprise that wireless concealed earphone detector is called for short the A machine and wireless communication signal shielding device is called for short the B machine; Described A machine is made up of electromagnetic induction signal collector (1), signal acquisition circuit (2), signal processing and analysis module (3), gain-adjusted control module (4), power analysis and control module (5), wireless dispatching receiving processing module (6), light-emitting diode display (7), LED output control module (8), audio optimization and output circuit (9), standard audio output interface (10), control panel (12), external charger (13), lithium battery (14); Electromagnetic induction signal collector (1) is connected with signal acquisition circuit (2), electromagnetic induction signal collector (1) sense the cheating concealed earphone to the variation that electromagnetic wave produced on every side after, produce induced electromotive force in the coil on the electromagnetic induction signal collector (1) and produce the induced current that changes with electromagnetic wave, signal acquisition circuit (2) carries out signals collecting to induced current; Signal acquisition circuit (2) divides two-way to be connected with wireless dispatching receiving processing module (6) with signal processing and analysis module (3) respectively, and this induced current of signal processing and analysis module (3) is analyzed, with the speech sound waves reduction of being caught; LED output control module (8) one ends are connected with signal processing and analysis module (3), the other end is connected with LED display (7), and the intensity of the speech sound waves signal of reduction and the size of acoustic pressure are obtained and analyzed by LED output control module (8) and export on the LED display (7); Gain-adjusted control module (4) is connected with control panel (12) with wireless dispatching receiving processing module (6), and the output volume of speech sound waves signal is controlled; Gain-adjusted control module (4) is connected with audio optimization output circuit (9), and audio optimization output circuit (9) is rejected the interference of environmental noise and other electric equipments; Audio optimization output circuit (9) is exported plug into common insert earphone, sound pick-up outfit, loud speaker by audio output interface (10); Power analysis and control module (5) are connected with external charger (13), lithium battery (14), and it analyzes the current electric quantity surplus; Described B machine is made of power supply (15), soft-start circuit (16), booster circuit (17), low-frequency oscillatory network (18), frequency sweep data generator (19), high-frequency oscillating circuits (20) and transmitter module (21); Power supply (15) is the each several part circuit supply after soft-start circuit (16) time-delay, the output of low-frequency oscillatory network (18) is connected with the input of frequency sweep data generator (19), the sawtooth waveforms that frequency sweep data generator (19) produces inserts the frequency of oscillation modulated terminal of high-frequency oscillating circuits (20) through output, the high-frequency signal after the modulation therein about frequency of heart scanning move; The frequency of oscillation modulated terminal that booster circuit (17) connects high-frequency oscillating circuits (20) is its power supply, and module (21) is penetrated in the output sending and receiving of high-frequency oscillating circuits (20), sends by antenna after its power amplification.
2. examination hall according to claim 1, meeting-place technical precaution detector shield scheduling unit mahine, it is characterized in that: the light-emitting diode display (7) in the described A machine can be LCDs or charactron.
3. examination hall according to claim 1, meeting-place technical precaution detector shield scheduling unit mahine, it is characterized in that: power analysis in the described A machine and control module (5), signal processing and analysis module (3), wireless dispatch system receiving processing module (6), LED output control module (8) and gain-adjusted control module (4), by the unified control of kernel control chip; The model of kernel control chip can be 8051,8086, the EM78P153S single-chip microcomputer.
4. examination hall according to claim 1, meeting-place technical precaution detector shield scheduling unit mahine, it is characterized in that: be provided with the magnetic metal detection circuit in the described A machine, the magnetic metal detection circuit is a power amplification circuit.
5. examination hall according to claim 1, meeting-place technical precaution detector shield scheduling unit mahine, it is characterized in that: high-frequency oscillating circuits (20) and connected transmitter module (21) in the described B machine have some groups, respectively at the communication apparatus of different center frequency, the sawtooth waveforms that frequency sweep data generator (19) produces inserts high-frequency oscillating circuits (20) respectively through output, high-frequency signal after the modulation scans about frequency of heart therein and moves, by transmitter module (21) power amplification separately, after launching by antenna, to be received by near mobile phone, and form overlapped signal and make wireless telecommunications system such as mobile phone be in busy state and can not use.
6. examination hall according to claim 1, meeting-place technical precaution detector shield scheduling unit mahine, it is characterized in that: the booster circuit (17) in the described B machine, the frequency of oscillation modulated terminal of its output termination high-frequency oscillating circuits (20) makes back level oscillating circuit produce bigger offset frequency.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007201438659U CN201051742Y (en) | 2007-04-17 | 2007-04-17 | Examination room and conference room detection prevention shielding scheduling combiner |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007201438659U CN201051742Y (en) | 2007-04-17 | 2007-04-17 | Examination room and conference room detection prevention shielding scheduling combiner |
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| CN201051742Y true CN201051742Y (en) | 2008-04-23 |
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| CNU2007201438659U Expired - Lifetime CN201051742Y (en) | 2007-04-17 | 2007-04-17 | Examination room and conference room detection prevention shielding scheduling combiner |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527574A (en) * | 2009-03-27 | 2009-09-09 | 王方松 | Shielding system for seamless grading management |
| CN101873145A (en) * | 2010-05-21 | 2010-10-27 | 杭州电子科技大学 | Method and device for interfering passive wireless headphone by audio electromagnetic field |
| CN103472500A (en) * | 2013-10-02 | 2013-12-25 | 黑龙江大学 | Multifunctional examination room anti-cheat detecting device and anti-cheat detecting method. |
| CN105162941A (en) * | 2015-07-23 | 2015-12-16 | 胡智刚 | Anti-eavesdropping anti-monitoring device |
| CN106658285A (en) * | 2016-10-21 | 2017-05-10 | 天津市英讯科技有限公司 | Miniature frequency-mixing and recording isolator |
| CN109091755A (en) * | 2018-09-21 | 2018-12-28 | 上海华聆人工耳医疗科技有限公司 | A kind of artificial cochlea's special-purpose radio-frequency signal supervisory instrument and method |
| CN111585689A (en) * | 2019-02-15 | 2020-08-25 | 塔塔顾问服务有限公司 | System and method for interrupting unauthorized communication in a low frequency radio communication device |
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2007
- 2007-04-17 CN CNU2007201438659U patent/CN201051742Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527574A (en) * | 2009-03-27 | 2009-09-09 | 王方松 | Shielding system for seamless grading management |
| CN101527574B (en) * | 2009-03-27 | 2013-08-28 | 王方松 | Shielding system for seamless grading management |
| CN101873145A (en) * | 2010-05-21 | 2010-10-27 | 杭州电子科技大学 | Method and device for interfering passive wireless headphone by audio electromagnetic field |
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| CN109091755A (en) * | 2018-09-21 | 2018-12-28 | 上海华聆人工耳医疗科技有限公司 | A kind of artificial cochlea's special-purpose radio-frequency signal supervisory instrument and method |
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