CN201409118Y - Wireless invisible earpiece shielding device - Google Patents
Wireless invisible earpiece shielding device Download PDFInfo
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- CN201409118Y CN201409118Y CN2009201552846U CN200920155284U CN201409118Y CN 201409118 Y CN201409118 Y CN 201409118Y CN 2009201552846 U CN2009201552846 U CN 2009201552846U CN 200920155284 U CN200920155284 U CN 200920155284U CN 201409118 Y CN201409118 Y CN 201409118Y
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- pulse oscillator
- electronic switch
- power amplifier
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Abstract
The utility model provides a wireless invisible earpiece shielding device. A swept-frequency signal source output terminal and a clock signal source output terminal are connected with the two input terminals of a Nor gate circuit respectively, the output terminal of the Nor gate circuit is connected with the input terminal of a decadic pulse distributor, the output terminals of the decadic pulsedistributor are connected with electronic switch interfaces respectively, one-side terminals of the electronic switch interfaces are connected in parallel and then grounded and the other-side terminals thereof are connected with one-side terminals of timing resistors, the other-side terminals of the timing resistors are connected in parallel and then connected with the incoming terminal of the timing resistor of a pulse oscillator, the complementary output of the pulse oscillator is connected with the input of a power amplifier tube, and the output of the power amplifier tube is connected witha load coil. In the wireless invisible earpiece shielding device, the random complementary combination of audio pulse signals generated by the pulse oscillator are amplified by the push-pull power amplifier and then outputted to the load coil, the magnetic field of random combination of analog audio signals generated by the load coil covers the examination room, thereby achieving the purpose of disturbing and blocking the cheating signal reception of the wireless invisible earpiece in the audio transmission channel.
Description
One, technical field:
The utility model relates to wireless concealed earphone shielding device, belongs to the Communication Jamming field.
Two, background technology:
Current, utilize wireless concealed earphone to receive cheating information the examination hall examinee, taked two kinds of communication modes of link.The one, utilize radio communication equipment, inside and outside the examination hall, set up the radio communication mode, finish the link of radio-frequency (RF) radio transmission channel; The 2nd, the audio frequency output of the examinee being carried micro-receiver is connected to audio frequency magnetic field transponder, set up audio frequency magnetic field coupled communication mode with the wireless concealed earphone that is arranged in examinee's duct, finish the link of distance element audio transmission channel, two kinds of communication modes constitute relay communications, with cheating information by being sent to the wireless concealed earphone that is arranged in examinee's duct outside the examination hall.
Utilize wireless concealed earphone to receive the information that cheats at one's exam in the examination hall strick precaution, mainly taked following technological means: 1, by professional radio-frequency spectrum monitoring personnel, around examination point, carry out aerial spectrum monitoring, search for, discern, analyze suspicious frequency signal, take to discharge co-channel interference, blocking-up, shielding cheating information at confirming the cheating frequency signal; Or take direction finding to follow the trail of emission source, investigate and prosecute emission cheating information party.2, the radio shielding device is installed in the examination hall, at radio transmission channel shielding cheating signal.3, invigilate, patrol and examine the staff by the examination hall, utilize metal detector, wireless concealed earphone detector inspection examinee to carry and use wireless concealed earphone.
The prior art means exist deficiency to be: 1, need be in a plurality of radio communication service frequency ranges, and identification the unknown frequency signal of practising fraud at random follows the tracks of simultaneously at short notice that the cheating frequency signal has certain technical difficulty and difficulty more than two, is difficult to take into account a plurality of examination points; The cribber causes monitoring to be in the passive tracking stage all the time bringing in constant renewal in wireless device type, conversion frequency, taking anti-detecting measure such as voice encryption; 2, existing shielding device is difficult to cover whole radio communication service frequency ranges, and the cribber has the noiseless operating frequency opportunity of selection; 3, the cribber can take the anti-means of detecting in a plurality of strick precaution links, such as, the examinee can be by sensitive switch or mercoid switch control audio magnetic field transponder emission with stop, giving and examine the affair personnel and use concealed earphone detector inspection and 3dpa magnetic field transponder emission source to bring difficulty.
Three, summary of the invention:
The purpose of this utility model is to provide a kind of can produce stochastic simulation combining audio signals Distribution of Magnetic Field in audio transmission channel, reach interference, block transmission of cheating signal and the wireless concealed earphone shielding device that receives.
Technical solution: the output of swept signal source and clock signal source is connected two inputs of OR-NOT circuit respectively, the OR-NOT circuit output is connected with decadic pulsing distributor input, the decadic pulsing dispenser output end is connected with the electronic switch interface respectively, ground connection after the electronic switch one end parallel connection, the other end is connected with timing resistor one end respectively, be connected with pulse oscillator timing resistor incoming end after the parallel connection of the timing resistor other end, pulse oscillator output is connected with the power amplifier tube input, and power amplifier tube output is connected with loading coil.
The electronic switch interface is 10 transistorized base stages.
Timing resistor is pulse oscillator frequency of oscillation network resistor for a change.
But loading coil is forward to be connected into the closed-loop path by the multi-core power lead through plug-in connector.
The beneficial effects of the utility model: owing to be in audio transmission channel, take the audio disturbances measure, the radio jamming concealed earphone receives cheating signal, no wireless radiofrequency wave interference and radio-frequency electromagnetic environmental pollution; This utility model is arranged on the examination hall, can makes to be arranged on that wireless concealed earphone sends the combining audio interference sound all the time in examinee's duct, play initiatively deterrence, take precautions against of the application of wireless concealed earphone in the examination hall cheating.
Four, description of drawings
Fig. 1 is the utility model schematic block circuit diagram;
Fig. 2 is the utility model circuit theory diagrams.
Five, embodiment
The utility model connects two inputs of OR-NOT circuit respectively with the output of swept signal source and clock signal source, the OR-NOT circuit output is connected with decadic pulsing distributor input, the decadic pulsing dispenser output end is connected with the electronic switch interface respectively, ground connection after the electronic switch one end parallel connection, the other end is connected with timing resistor one end respectively, be connected with pulse oscillator timing resistor incoming end after the parallel connection of the timing resistor other end, pulse oscillator output is connected with the power amplifier tube input, and power amplifier tube output is connected with loading coil.
Swept signal source: output 1-2.5KHz is scan round signal from high to low more from low to high;
Signal source of clock: output 8Hz clock signal;
OR-NOT circuit: swept signal source and signal source of clock are synthesized the random binary serial pulse signal;
Pulsqe distributor: the random binary serial pulse signal is converted to the output of decimal system circulation time sequential pulse signal.The electronic switch interface circuit: with 10 UN1214 type band biasing resistor transistor bases as the electronic switch controling end mouth, respectively with the corresponding connection of 10 decimal system circulations of pulsqe distributor output, ground connection after the emitter parallel connection, collector electrode respectively with the corresponding connection of an end of 10 timing resistors, be connected with pulse oscillator timing resistor input after the other end parallel connection of 10 timing resistors.The electronic switch interface circuit, according to decimal system circulation output timing pulse duration loop control timing resistor turn-on time over the ground, control pwm pulse oscillator produces corresponding frequency of oscillation, and control pwm pulse oscillator is according to the combining audio pulse signal output at random of pulsqe distributor decimal system circulation timing sequence generating.
Determine the method for timing resistor resistance: determine ten frequencies in voice band 300Hz-4.3KHz scope earlier; Computing formula T=(0.67R cycle of oscillation that provides according to pwm pulse oscillator chip SG3525 application manual again
T+ 1.3R
D) C
T, obtain the corresponding resistance of ten timing resistors, make the pwm pulse oscillator produce combining audio pulse signal at random in speech transmissions frequency band 300Hz-4.3KHz scope.The corresponding frequency of oscillation of each timing resistor changes timing resistor and puts in order and can change the pwm pulse oscillator and export the spectrum structure of combining audio pulse signal at random, to reach the optimum efficiency that disturbs wireless concealed earphone to receive the cheating speech transmissions.
Pwm pulse oscillator: produce frequency of oscillation according to electronic switch interface sequence pulse duration, produce combining audio pulse signal output at random according to the electronic switch interface sequence; Get pwm pulse oscillator complementary output signal, drive the push-pull power amplifier circuit that constitutes by power tube and loading coil.
Power amplification circuit: constitute push-pull power amplifier circuit by power tube and loading coil. power amplification is carried out in paired pulses oscillator output complementation combining audio pulse signal electric current at random, and outputs to loading coil;
Loading coil:, change its surrounding space stochastic simulation combining audio signals Distribution of Magnetic Field into the pulse signal of the combining audio at random electric current of power amplification circuit complementary output.Loading coil structure: be forward to be connected into the closed-loop path by plug-in connector by the multi-core power lead, draw line respectively at connector plug or socket one lateral load coil two ends terminals and receive XP3 terminals 1 end and 3 ends, draw line at loading coil centre cap terminals and receive XP3 terminals 2 ends, XP3 is the plug of XP2 socket.
The utility model civil power alternating current 220V is introduced by supply socket XP1, to 2 ends, constitutes current supply circuit through mains switch SH, elementary 1 end of insurance F1, power transformer T.
T level of power transformer 3,4 end output AC 50V voltages, be connected respectively to the AC input of full-bridge rectifier D2, full-bridge rectifier D2 output negative pole connects mainboard ground, the anodal filter capacitor C1 positive pole that connects, be connected to loading coil L centre cap 2 ends through 2 ends of insurance F2, XP2,2 ends of XP3 again, divide two-way output by loading coil L again, 1 end of one tunnel 1 end through loading coil L, XP3,1 end of XP2 are to the Q14 collector electrode; Another road to the Q13 collector electrode, is supplied with Q14, Q13 push-pull power amplifier circuit direct-current working volts through 3 ends of 3 ends of 3 ends of loading coil L, XP3, XP2.
T level of power transformer 5,6 end output AC 18V voltages, be connected respectively to the AC input of mainboard full-bridge rectifier D1, full-bridge rectifier D1 output negative pole connects mainboard ground, output cathode connects filter capacitor C2 positive pole, pressurizer VR imports 1 end, pressurizer VR exports 3 ends and connects IC4 pin 15 and 13 ends, supplies with the IC4 direct-current working volts; IC4 pin 16 ends output 5.1V voltage stabilizing connects IC2 pin 16 ends, IC3 pin 16 ends; Be connected to IC1 pin 1 end through R2 current limliting, D4 voltage stabilizing, C4 filtering again; Be connected to Q1, Q2 collector electrode through R3 again; Supply with IC1, IC2, IC3 and OR-NOT circuit direct-current working volts.
Main circuit board IC1 swept signal source output pin 3 ends and IC2 signal source of clock output pin 1 end are connected the base stage of Q1, Q2 respectively; Q1, Q2 constitute OR-NOT circuit, and Q1, Q2 collector electrode output in parallel random binary serial pulse signal are connected to IC3 pulsqe distributor input pin 14 ends; Change the random binary serial pulse signal into decimal system circulation output by pulsqe distributor, the corresponding respectively base stage that connects electronic switch Q10, Q11, Q9, Q6, Q4, Q12, Q8, Q7, Q5, Q3 of pulsqe distributor output pin 3 (Y0), 2 (Y1), 4 (Y2), 7 (Y3), 10 (Y4), 1 (Y5), 5 (Y6), 6 (Y7), 9 (Y8), 11 (Y9); Ground connection after electronic switch Q10, Q11, Q9, Q6, Q4, Q12, Q8, Q7, Q5, the parallel connection of Q3 emitter, corresponding respectively timing resistor Rt1, Rt2, Rt3, Rt4, Rt5, Rt6, Rt7, Rt8, Rt9, Rt10 one end of connecting of electronic switch Q10, Q11, Q9, Q6, Q4, Q12, Q8, Q7, Q5, Q3 collector electrode; Connect IC4PWM pulse oscillator timing resistor after the parallel connection of the timing resistor Rt1-Rt10 other end and insert pin 6 ends; By the electronic switch interface circuit according to decimal system circulation output timing pulse duration, switching timing resistance R t1-Rt10 break-make over the ground at random, randomly changing IC4PWM pulse oscillator frequency of oscillation makes the pwm pulse oscillator produce combining audio pulse signal output at random according to decimal system circulation output timing.Change timing resistor and put in order, can change the spectrum structure of combining audio pulse signal at random.Pwm pulse oscillator 11 pin and 14 pin produce binary system complementary output drive signal, be connected respectively to power amplifier tube Q13, the Q14 control utmost point, Q13, Q14 grounded emitter, Q13, Q14 collector electrode are connected respectively to 1 end and 3 ends of loading coil L connector socket XP2; Power amplifier tube Q13, Q14 through insulation liner insulation and radiator by bolted.Q13, Q14 and loading coil L constitute push-pull amplifier circuit, the pulse signal of combining audio at random that the pwm pulse oscillator is produced carries out complementary power amplification, by loading coil L with complementation at random combining audio pulse signal current transitions be the stochastic simulation combining audio signals Distribution of Magnetic Field of certain space scope around it.Change W10K variable resistor resistance, can adjust pwm pulse oscillator output pulse width, control Q13, Q14 ON time, control power output size changes loading coil L Distribution of Magnetic Field intensity.
The utility model is arranged on the examination hall, and loading coil L is around examination hall ground level or the certain area setting of side wall.With loading coil L connection plug XP3 with after loading coil L connector socket XP2 docks, exchanging input socket XP1 access civil power alternating current 220V voltage, turn on the power switch, LED light is lighted, this shielding device enters operating state, will produce stochastic simulation combining audio signals magnetic field at loading coil L surrounding space and cover the examination hall.
Claims (4)
1, wireless concealed earphone shielding device, it is characterized in that: the output of swept signal source and clock signal source is connected two inputs of OR-NOT circuit respectively, the OR-NOT circuit output is connected with decadic pulsing distributor input, the decadic pulsing dispenser output end is connected with the electronic switch interface respectively, ground connection after the electronic switch one end parallel connection, the other end is connected with timing resistor one end respectively, be connected with pulse oscillator timing resistor incoming end after the parallel connection of the timing resistor other end, pulse oscillator output is connected with the power amplifier tube input, and power amplifier tube output is connected with loading coil.
2, wireless concealed earphone shielding device according to claim 1, it is characterized in that: the electronic switch interface is transistorized base stage.
3, wireless concealed earphone shielding device according to claim 1, it is characterized in that: timing resistor is pulse oscillator frequency of oscillation network resistor for a change.
4, wireless concealed earphone shielding device according to claim 1, it is characterized in that: loading coil is forward to be connected into the closed-loop path by the multi-core power lead by plug-in connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201552846U CN201409118Y (en) | 2009-05-25 | 2009-05-25 | Wireless invisible earpiece shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201552846U CN201409118Y (en) | 2009-05-25 | 2009-05-25 | Wireless invisible earpiece shielding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201409118Y true CN201409118Y (en) | 2010-02-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201552846U Expired - Fee Related CN201409118Y (en) | 2009-05-25 | 2009-05-25 | Wireless invisible earpiece shielding device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102104437A (en) * | 2011-01-11 | 2011-06-22 | 北京理工大学 | Radio system for preventing cheating on exams |
| CN105101007A (en) * | 2014-05-21 | 2015-11-25 | 胡建人 | Method and apparatus for suppressing passive wireless earphones through pulsed magnet field |
-
2009
- 2009-05-25 CN CN2009201552846U patent/CN201409118Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101873145B (en) * | 2010-05-21 | 2013-03-27 | 杭州电子科技大学 | Method and device for interfering passive wireless headphone by audio electromagnetic field |
| CN102104437A (en) * | 2011-01-11 | 2011-06-22 | 北京理工大学 | Radio system for preventing cheating on exams |
| CN105101007A (en) * | 2014-05-21 | 2015-11-25 | 胡建人 | Method and apparatus for suppressing passive wireless earphones through pulsed magnet field |
| CN105101007B (en) * | 2014-05-21 | 2019-12-24 | 胡建人 | Method for suppressing passive wireless earphone by pulse magnetic field |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100217 Termination date: 20120525 |