CN202444497U - Shielding system for preventing examination room wireless cheating - Google Patents
Shielding system for preventing examination room wireless cheating Download PDFInfo
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- CN202444497U CN202444497U CN2012200452170U CN201220045217U CN202444497U CN 202444497 U CN202444497 U CN 202444497U CN 2012200452170 U CN2012200452170 U CN 2012200452170U CN 201220045217 U CN201220045217 U CN 201220045217U CN 202444497 U CN202444497 U CN 202444497U
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Abstract
A shielding system for preventing examination room wireless cheating is characterized by comprising a mobile phone downlink channel and wireless local area network (WLAN) shielding unit (1), a 50-820MHz full frequency band shielding unit (2), a wireless audio signal blocking unit (3), a microcomputer control system unit (4), a human-computer interaction interface unit (5), an equipment communication interface unit (6) and an antenna array unit (7), wherein the microcomputer control system unit (4) is connected with the input ends of the mobile phone downlink channel and WLAN shielding unit (1), the 50-820MHz full frequency band shielding unit (2) and the wireless audio signal blocking unit (3), the output ends of the mobile phone downlink channel and WLAN shielding unit (1), the 50-820MHz full frequency band shielding unit (2) and the wireless audio signal blocking unit (3) are connected with the input end of the antenna array unit (7), and the antenna array unit (7) sends out a corresponding interference signal. The shielding system integrates multiple signal shielding technologies into a whole, the system volume is reduced, the system installation complexity is lowered, and the system working efficiency is improved.
Description
Technical field
The utility model relates to a kind of shielding harness that can in full range band a-n radio range a-n, take precautions against the examination hall cheating; Especially a kind of characteristics to the wireless cheating of current high-tech; The shielding harness of the multiband that carries out, multimode blocking-up radio cheating signal, specifically a kind of strick precaution examination hall radio cheating shielding harness.
Background technology
At present, along with development of wireless communication devices, the behavior that utilizes wireless signal in the examination hall, to practise fraud at present is also increasing, and the mode of wireless signal cheating at present is classified as following several kinds of modes:
1. through the mobile phone signal cheating
(1) utilize the SMS passage to send the cheating mode of answer to cribber's the mobile phone: the action that this mode is practised fraud is bigger, and is therefore disguised relatively poor.
(2) utilize the cheating mode of mobile phone+audio frequency transponder+concealed earphone: the examinee carries mobile phone, audio frequency transponder and concealed earphone; Obtain outside the venue to dial examinee's mobile phone after the answer; Mobile phone is set to quiet and auto-pickup; And through earphone interface speech is received on the audio frequency transponder, the audio frequency transponder through on examinee's neck or between waist or the coil on the clothes speech is converted into the magnetic field with sound variation, though so the magnetic bodies in the action of a magnetic field scope all can to produce this vibration of the vibration the same with sound very faint; But, utilize the high sensitivity of people's ear can not hear the sound of generation because concealed earphone is positioned on duct, ear-drum or the oral cavity.It is disguised that this mode has improved cheating.
Because the mobile phone signal frequency range confirms that modulation system is also confirmed, is easy to disturbed and shield, present this cheating mode has been shielded by effective in formal examination above the provincial level, but in daily examination, still happens occasionally.
2. through the cheating of particular frequency bands radio signal
(1) utilize the communication of pin hole shooting+microwave wireless to carry out image transmission cheating mode: through the communication of pin hole shooting+microwave wireless from the examination hall to unofficial biography paper image to steal paper; It uses the frequency range of microwave to be generally 1.2GHz or 2.4GHz frequency; The cribber that the acceptance point distance is carried transmitter generally also can be accompanied by outside the venue and command the cribber who carries camera to carry out moving of paper through speech ciphering equipments such as intercoms in 300 meters.
(2) utilize intercom+transceiver machine+concealed earphone cheating mode: this mode with utilize mobile phone+audio frequency transponder+concealed earphone cheating mode similar; Only be to use the receiving system of intercom or other similar intercoms to replace mobile phone, avoid the interference of mobile phone shielding device.
(3) utilize particular frequency bands to count transmission transmitter+number and pass the mode that reception is practised fraud: be characterized in disguised strong; Receiving terminal often disguised oneself as pen, wrist-watch, ruler, rubber, spectacle case, belt fastener or the like; And answer information is stored with written form; Liquid crystal display is equivalent to beep-pager on the function, can transmit bigger literal amount at short notice.The transmission speed of data transmission equipment is very fast, generally can reach 2400～9600bps, is equivalent to more than 50～200 Chinese character of per second transmission, and in fact owing to added verification and error correcting code, real transmission speed is about 20～80 Chinese characters.It is more that number passes the cheating functions of the equipments, comprises filtering duplicate message and error message, and moment destroys data function and uses the remote control pen to come page turning and switch screen etc.
The cheating of particular frequency bands radio signal is to use maximum radio cheating modes at present, accounts for more than 3/4 of present cheating equipment.Sometimes can use powerful vehicle radio station to improve the distance of cheating outside the venue, the frequency of receiver can realize frequency hopping through computer, and therefore disguised and anti-shielding interference performance is strong.
Summary of the invention
The purpose of the utility model is to existing shielding harness function singleness; Can't realize problem that the particular frequency bands radio signal is shielded, design and a kind ofly can realize the shielding of all available communication frequency ranges and realize the strick precaution examination hall radio cheating shielding harness of the blocking-up of wireless audio signal the examination hall.
The technical scheme of the utility model is:
Radio cheating shielding harness in a kind of strick precaution examination hall is characterized in that it comprises:
One mobile phone down going channel and WLAN screen unit 1, this mobile phone down going channel and WLAN screen unit 1 are used to realize the signal fixed frequency shielding blocking-up to mobile phone down going channel and WLAN WLAN;
One 50～820MHz full frequency band screen unit 2, this 50～820MHz full frequency band frequency sweep unit 2 is realized the wireless signal in 50～820MHz scope is disturbed through disturbing with interior swept-frequency signal at 1 μ s;
One wireless audio signal blocking unit 3, this wireless audio signal blocking unit 3 are used to realize the shielding blocking-up to the 20Hz-20kHz wireless audio signal;
One Control System of Microcomputer unit 4, this Control System of Microcomputer unit 4 be used for system the control of self check, working method, the frequency sweep mode is controlled and with two-way connection of data-signal link of Man Machine Interface unit 5 and device talk interface unit 6; Its control signal output ends is connected with mobile phone down going channel and WLAN screen unit 1,50～820MHz full frequency band screen unit 2 and wireless audio signal blocking unit 3 corresponding input end;
One man-machine interactive operation interface unit 5, this man-machine interactive operation interface unit 5 be used to realize receiving operating personnel key command, realize the system mode Presentation Function through LED or LCD;
One device talk interface unit 6, this device talk interface unit 6 are used to realize debugging, the program download of system equipment and receive upper remote operation instruction;
One antenna array unit 7, this antenna array unit 7 is used to realize the emission and the covering of multiband wireless signal; Its input links to each other with mobile phone down going channel and WLAN screen unit 1,50～820MHz full frequency band screen unit 2 and wireless audio signal blocking unit 3 corresponding outputs respectively, and its power detection signal feedback end links to each other with Control System of Microcomputer unit 4 corresponding input end.
Described mobile phone down going channel and WLAN screen unit system 1 mainly are made up of multi-channel signals generator 101, signal modulator 102, traffic filter 103 and radiofrequency signal power amplifier 104; The signal input end of multi-channel signals generator 101 links to each other with the control signal output ends of microcomputer control unit 4; Multi-channel signals generator 101 work produce the descending and WLAN frequency band signals of mobile phone; Signal produces radiofrequency signal through signal modulator 102, traffic filter 103 and signal RF unit 104 successively; Radiofrequency signal inserts antenna array unit 7 corresponding input end of customization and launches, and realizes the fixed frequency range blocking-up of mobile phone down going channel and WLAN signal and effective covering of shielded signal.
Described 50～820MHz full frequency band screen unit 2 mainly is made up of radiofrequency signal power amplifier 201, shielded signal filter 202, swept-frequency signal filter 203, shielded signal modulator 204, frequency hopper 205, mask signal generator 206 and 207 of frequency hopping local oscillators; The signal controlling end of mask signal generator 206 links to each other with the control signal output ends of microcomputer control unit 4; Shieldings interference signal in mask signal generator 206 generation examination halls directly forms the high-frequency modulation signal of special frequency through shielded signal modulator 204, and this signal one tunnel is through the radio shielding interference signal of shielded signal filter 202 and radiofrequency signal power amplifier 201 generation special frequency and insert antenna array unit 7; Another road gets into frequency hopper 205; In frequency hopper 205; The frequency hopping command signal that the modulation signal that this shielded signal modulator 204 produces and computer management control unit 4 produce and synthesize by the local oscillation signal of frequency hopping local oscillator 207 generations and to form the specific waveforms swept-frequency signal; This specific waveforms swept-frequency signal is sent into after 203 filtering of swept-frequency signal filter and is formed frequency sweep shielded radio frequency signal in the radiofrequency signal power amplifier 201; This frequency sweep shielded radio frequency signal is launched through antenna array unit 7, realizes the effective covering on shielding of 50～820MHz full frequency band and the space; Power detecting unit to just antennal interface on the antenna array unit 7 produces the power detection signal, and this detection signal feeds back to microcomputer control unit 4 in order to judge the operating state of 50～820MHz full frequency band screen unit 2.
Described wireless audio signal blocking unit 3 mainly is made up of audio demodulator 301 and audio signal amplifier 302; The input of audio demodulator 301 links to each other with clutter noise signal and cheating warning signal output that microcomputer control unit 4 produces; Audio demodulator 301 forms powerful tone currents signal with amplifying in clutter noise signal and the cheating warning signal modulation back input audio signal amplifier 302; This tone currents signal is sent into and is produced audio frequency magnetic field in the voice coil in the antenna array unit 7; In earphone, form to disturb, make the concealed earphone cribber activity of can't normally practising fraud of adopting; The power detecting unit of antenna array unit 7 respective antenna interfaces produces the power detection signal, and feeds back to microcomputer control unit 4 in order to judge the operating state of wireless audio signal blocking unit 3.
Described audio signal amplifier 302 also is connected with intelligence coupling induction coil 303; Intelligence coupling induction coil 303 is sent to the tone currents of sensing the negative feedback unit of audio signal amplifier 302 as current feedback signal; Make the electric current in the audio frequency field coil produce the self adaptation regulatory function of constant flux gesture realization for the Classroom System of different sizes, audio frequency magnetic field keeps best output state at any time.
Described antenna array unit 7 mainly is made up of mobile phone down going channel and WLAN aerial array 701,50～820MHz full frequency band aerial array 702, voice coil 703 and power detecting unit 704; Mobile phone and WLAN frequency range radiofrequency signal are sent by mobile phone down going channel and WLAN aerial array group 701; 50～820MHz frequency range radiofrequency signal is sent by 50～820MHz full frequency band aerial array 702; The tone currents signal is sent by voice coil 703; The power output of power detecting unit 704 detection of handset down going channels and WLAN aerial array 701,50～820MHz full frequency band aerial array 702 and voice coil 703, and whether detection signal is transferred to microcomputer control unit 4 normal in order to the operating state of judging system.
The beneficial effect of the utility model:
1. utility model can effectively be taken precautions against the radio cheating of multiple mode, comprising: special frequency or cheating in mobile communication cheating, the cheating of WLAN frequency range, the 50MHz--820MHz band limits.
2. 50～820MHz full frequency band frequency sweep unit 2 of the micro-processor controlled frequency hopping frequency sweep of the utility model; Can produce multiple frequency sweep waveforms such as sine wave, triangular wave, sawtooth waveforms, staircase waveform, square wave, random frequency hopping; Can form jamming signal types such as noise FM interference, the interference of function frequency sweep, function frequency sweep+noise jamming, effectively take precautions against the frequency modulation cheating of radio signal.
3. the wireless audio signal blocking unit 3 of the utility model; Adopted intelligent coupling induction coil 303 tone currents of sensing to be sent to the negative feedback unit of audio signal amplifier as current feedback signal; Make the electric current in the audio frequency field coil produce the self adaptation regulatory function of constant flux gesture realization for the Classroom System of different sizes; At any time audio frequency magnetic field keeps best output state, has guaranteed the blocking-up of wireless audio signal technically.
4. the utility model becomes one through multiple signal shielding technology, has reduced the volume of system, has reduced the complexity that system installs, and has improved the operating efficiency of system.
5. the utlity model has good self-checking function, improved the reliability of system, reduced the repair and maintenance difficulty of system.
6. the debugging of the device talk interface unit 6 feasible system equipment of the utility model, program are downloaded the cost degradation that can realize that system upgrade is regenerated; Have and receive upper remote operation instruction; Realize the remote operation control of novel strick precaution examination hall radio cheating shielding harness, this provides possibility for the checkout equipment interlock with radio cheating detection signal.
Description of drawings
Fig. 1 is the system configuration sketch map of the utility model.
Fig. 2 is the mobile phone down going channel and the WLAN screen unit system block diagram of the utility model.
Fig. 3 is the system block diagram of 50～820MHz full frequency band screen unit of the utility model.
Fig. 4 is the system block diagram of the wireless audio signal blocking unit of the utility model.
Fig. 5 is the system block diagram of the antenna array unit of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further described.
Shown in Fig. 1-5.
A kind of strick precaution examination hall radio cheating shielding harness; It mainly is made up of mobile phone down going channel and WLAN screen unit 1,50～820MHz full frequency band screen unit 2, wireless audio signal blocking unit 3, Control System of Microcomputer unit 4, man-machine interactive operation interface unit 5, device talk interface unit 6,7 of antenna array units, like Fig. 1.The blocking-up scope of the wireless audio signal that it can be realized is as shown in table 1.
The function that each component units of the utility model is realized is:
1. mobile phone down going channel and WLAN screen unit 1 are realized the signal fixed frequency shielding blocking-up to mobile phone down going channel and WLAN WLAN;
2.50～820MHz full frequency band frequency sweep unit 2 is realized the wireless signal in 50～820MHz scope is disturbed through disturbing with interior swept-frequency signal at 1 μ s;
3. the wireless audio signal blocking unit 3, realize wireless audio signal shielding blocking-up;
4. the Control System of Microcomputer unit 4, realize that self check, working method control, the frequency sweep mode of system controlled, Man Machine Interface unit controls, the control of device talk interface unit;
5. the man-machine interactive operation interface unit 5, realize to receive operating personnel's key command, through LED or LCD actual state Presentation Function.
6. the device talk interface unit 6, realize debugging, the program download of system equipment and receive upper remote operation instruction.
7. antenna array unit 7, realize the emission and the covering of multiband wireless signal.
Details are as follows for each component units:
1. the block diagram of mobile phone down going channel and WLAN screen unit system 1 is as shown in Figure 2.It mainly is made up of multi-channel signals generator 101, signal modulator 102, traffic filter 103,104 of radiofrequency signal power amplifiers.Concrete working method is; Multi-channel signals generator 101 work produce the descending and WLAN frequency band signals of mobile phone; Signal produces radiofrequency signal through signal modulator 102, traffic filter 103 and signal RF unit 104 successively; And radiofrequency signal inserted the aerial array of customization and launch, realize the fixed frequency range blocking-up of mobile phone down going channel and WLAN signal and effective covering of shielded signal.Wherein, the power detecting unit 704 of antenna array unit 7 respective antenna interfaces (seeing shown in Figure 5) produces the power detection signal, and feeds back to microcomputer control unit in order to judge the operating state of this unit.
2.50～820MHz full frequency band frequency sweep unit 2 system block diagrams are as shown in Figure 3.
50～820MHz full frequency band frequency sweep unit 2 mainly is made up of radiofrequency signal power amplifier 201, shielded signal filter 202, swept-frequency signal filter 203, shielded signal modulator 204, frequency hopper 205, mask signal generator 206,207 of frequency hopping local oscillators.Concrete working method is the high-frequency modulation signals of shielding interference signal in mask signal generator 206 generation examination halls through shielded signal modulator 204 direct formation special frequency, and this signal one tunnel generates the radio shielding interference signal of special frequency and inserts antenna array unit 7 through shielded signal filter 202 and radiofrequency signal power amplifier 201; Another road gets into the Frequency Hopping Signal generator; In frequency hopper, form the specific waveforms swept-frequency signal and form frequency sweep shielded radio frequency signal through swept-frequency signal filter 203 and radiofrequency signal power amplifier 201 through the local oscillation signal of high-frequency modulation signal and frequency hopping local oscillator 207 being synthesized by the frequency hopping command generator of computer management control unit control and frequency synthesizer; And it is inserted antenna array unit 7 and launch, realize the effective covering on shielding of 50～820MHz full frequency band and the space.Wherein, the power detecting unit 704 of antenna array unit 7 respective antenna interfaces (seeing shown in Figure 5) produces the power detection signal, and feeds back to microcomputer control unit in order to judge the operating state of this unit.
3. wireless audio signal blocking unit 3 system block diagrams are as shown in Figure 4.
Wireless audio signal blocking unit 3 mainly is made up of audio demodulator 301, audio signal amplifier 302, intelligence coupling induction coil 303.Concrete working method is that microcomputer control unit produces the clutter noise signal or the cheating warning signal forms powerful tone currents signal through audio demodulator 301 and audio signal amplifier 302; This signal is sent in the voice coil 703 (seeing shown in Figure 5) in the antenna array unit will form current circuit; According to the oersted effect, will around coil, produce audio frequency magnetic field, according to Ampere's law; The enhancing that will superpose at the center, classroom of these magnetic fields, outside the classroom then relatively a little less than.These magnetic fields equally can be to concealed earphone generation effect, disturbs thereby in earphone, form, and makes the concealed earphone cribber activity of can't normally practising fraud of adopting.In addition; Intelligence coupling induction coil 303 is sent to the tone currents of sensing the negative feedback unit of audio signal amplifier as current feedback signal; Make the electric current in the audio frequency field coil produce the self adaptation regulatory function of constant flux gesture realization for the Classroom System of different sizes, audio frequency magnetic field keeps best output state at any time.The power detecting unit 704 of antenna array unit 7 respective antenna interfaces (seeing shown in Figure 5) produces the power detection signal, and feeds back to microcomputer control unit in order to judge the operating state of this unit.
4. the Control System of Microcomputer unit 4, realize that self check, working method control, the frequency sweep mode of system controlled, Man Machine Interface unit controls, the control of device talk interface unit; Its system and the concrete function that realizes are seen shown in Fig. 1-4.
5. the man-machine interactive operation interface unit 5, realize to receive operating personnel's key command, through LED or LCD actual state Presentation Function.
6. the device talk interface unit 6, realize debugging, the program download of system equipment and receive upper remote operation instruction, realize the remote operation control of novel strick precaution examination hall radio cheating shielding harness.
7. antenna array unit 7 system block diagrams are as shown in Figure 5.
The utility model does not relate to all identical with the prior art prior art that maybe can adopt of part to be realized.
Claims (6)
1. take precautions against examination hall radio cheating shielding harness for one kind, it is characterized in that it comprises:
One mobile phone down going channel and WLAN screen unit (1), this mobile phone down going channel and WLAN screen unit (1) are used to realize the signal fixed frequency shielding blocking-up to mobile phone down going channel and WLAN WLAN;
One 50～820MHz full frequency band screen unit (2), this 50～820MHz full frequency band frequency sweep unit (2) is realized the wireless signal in 50～820MHz scope is disturbed through disturbing with interior swept-frequency signal at 1 μ s;
One wireless audio signal blocking unit (3), this wireless audio signal blocking unit (3) are used to realize the shielding blocking-up to the 20Hz-20kHz wireless audio signal;
One Control System of Microcomputer unit (4), this Control System of Microcomputer unit (4) be used for system the control of self check, working method, the frequency sweep mode is controlled and with two-way connection of data-signal link of Man Machine Interface unit (5) and device talk interface unit (6); Its control signal output ends is connected with mobile phone down going channel and WLAN screen unit (1), 50～820MHz full frequency band screen unit (2) and wireless audio signal blocking unit (3) corresponding input end;
One man-machine interactive operation interface unit (5), this man-machine interactive operation interface unit (5) be used to realize receiving operating personnel key command, realize the system mode Presentation Function through LED or LCD;
One device talk interface unit (6), this device talk interface unit (6) are used to realize debugging, the program download of system equipment and receive upper remote operation instruction;
One antenna array unit (7), this antenna array unit (7) is used to realize the emission and the covering of multiband wireless signal; Its input links to each other with mobile phone down going channel and WLAN screen unit (1), 50～820MHz full frequency band screen unit (2) and the corresponding output of wireless audio signal blocking unit (3) respectively, and its power detection signal feedback end links to each other with Control System of Microcomputer unit (4) corresponding input end.
2. strick precaution according to claim 1 examination hall radio cheating shielding harness; It is characterized in that described mobile phone down going channel and WLAN screen unit system (1) comprise multi-channel signals generator (101), signal modulator (102), traffic filter (103) and radiofrequency signal power amplifier (104); The signal input end of multi-channel signals generator (101) links to each other with the control signal output ends of microcomputer control unit (4); Multi-channel signals generator (101) work produces the descending and WLAN frequency band signals of mobile phone; Signal is successively through signal modulator (102), traffic filter (103) and signal RF unit (104) generation radiofrequency signal; Radiofrequency signal inserts antenna array unit (7) corresponding input end of customization and launches, and realizes the fixed frequency range blocking-up of mobile phone down going channel and WLAN signal and effective covering of shielded signal.
3. strick precaution according to claim 1 examination hall radio cheating shielding harness; It is characterized in that described 50～820MHz full frequency band screen unit (2) comprises radiofrequency signal power amplifier (201), shielded signal filter (202), swept-frequency signal filter (203), shielded signal modulator (204), frequency hopper (205), mask signal generator (206) and frequency hopping local oscillator (207); The signal controlling end of mask signal generator (206) links to each other with the control signal output ends of microcomputer control unit (4); Mask signal generator (206) produces examination hall shielding interference signal and directly forms the high-frequency modulation signal of special frequency through shielded signal modulator (204), and this signal one tunnel generates the radio shielding interference signal of special frequency and inserts antenna array unit (7) through shielded signal filter (202) and radiofrequency signal power amplifier (201); Another road gets into frequency hopper (205); In frequency hopper (205); The frequency hopping command signal that the modulation signal that this shielded signal modulator (204) produces and computer management control unit (4) produce and synthesize by the local oscillation signal of frequency hopping local oscillator (207) generation and to form swept-frequency signal; This swept-frequency signal is sent into after swept-frequency signal filter (203) filtering and is formed frequency sweep shielded radio frequency signal in the radiofrequency signal power amplifier (201); This frequency sweep shielded radio frequency signal is launched through antenna array unit (7), realizes the effective covering on shielding of 50～820MHz full frequency band and the space; The power detecting unit that antenna array unit (7) is gone up just antennal interface produces the power detection signal, and this detection signal feeds back to microcomputer control unit (4) in order to judge the operating state of 50～820MHz full frequency band screen unit (2).
4. strick precaution according to claim 1 examination hall radio cheating shielding harness; It is characterized in that described wireless audio signal blocking unit (3) comprises audio demodulator (301) and audio signal amplifier (302); The input of audio demodulator (301) links to each other with clutter noise signal and cheating warning signal output that microcomputer control unit (4) produces; Audio demodulator (301) forms powerful tone currents signal with amplifying in clutter noise signal and the cheating warning signal modulation back input audio signal amplifier (302); This tone currents signal is sent into and is produced audio frequency magnetic field in the voice coil in the antenna array unit (7); In earphone, form to disturb, make the concealed earphone cribber activity of can't normally practising fraud of adopting; The power detecting unit of antenna array unit (7) respective antenna interface produces the power detection signal, and feeds back to microcomputer control unit (4) in order to judge the operating state of wireless audio signal blocking unit (3).
5. strick precaution according to claim 4 examination hall radio cheating shielding harness; It is characterized in that described audio signal amplifier (302) also is connected with intelligence coupling induction coil (303), intelligence coupling induction coil (303) is sent to the tone currents of sensing the negative feedback unit of audio signal amplifier (302) as current feedback signal.
6. strick precaution according to claim 1 examination hall radio cheating shielding harness; It is characterized in that described antenna array unit (7) comprises mobile phone down going channel and WLAN aerial array (701), 50～820MHz full frequency band aerial array (702), voice coil (703) and power detecting unit (704); Mobile phone and WLAN frequency range radiofrequency signal are sent by mobile phone down going channel and WLAN aerial array group (701); 50～820MHz frequency range radiofrequency signal is sent by 50～820MHz full frequency band aerial array (702); The tone currents signal is sent by voice coil (703); The power output of power detecting unit (704) detection of handset down going channel and WLAN aerial array (701), 50～820MHz full frequency band aerial array (702) and voice coil (703), and whether detection signal is transferred to microcomputer control unit (4) normal in order to the operating state of judging system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200452170U CN202444497U (en) | 2012-02-13 | 2012-02-13 | Shielding system for preventing examination room wireless cheating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200452170U CN202444497U (en) | 2012-02-13 | 2012-02-13 | Shielding system for preventing examination room wireless cheating |
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| Publication Number | Publication Date |
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| CN202444497U true CN202444497U (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012200452170U Expired - Lifetime CN202444497U (en) | 2012-02-13 | 2012-02-13 | Shielding system for preventing examination room wireless cheating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117833A (en) * | 2012-12-05 | 2013-05-22 | 上海物联网有限公司 | Shielding device and shielding method of wireless local area network |
| CN103152121A (en) * | 2013-03-05 | 2013-06-12 | 京信通信系统（广州）有限公司 | Intelligent shielding signal generator and system for cell phone signals |
| CN105306162A (en) * | 2015-10-29 | 2016-02-03 | 天津光电安辰信息技术有限公司 | Mixing-based recording shielding device and realizing method thereof |
| CN106664142A (en) * | 2014-05-13 | 2017-05-10 | 美国思睿逻辑有限公司 | Systems and methods for reducing digital interference of external signals |
| CN107425927A (en) * | 2017-03-30 | 2017-12-01 | 天津市德力电子仪器有限公司 | Method for rapidly detecting shielding effect of wireless signal shielding device |
-
2012
- 2012-02-13 CN CN2012200452170U patent/CN202444497U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117833A (en) * | 2012-12-05 | 2013-05-22 | 上海物联网有限公司 | Shielding device and shielding method of wireless local area network |
| CN103117833B (en) * | 2012-12-05 | 2015-05-27 | 上海物联网有限公司 | Shielding device and shielding method of wireless local area network |
| CN103152121A (en) * | 2013-03-05 | 2013-06-12 | 京信通信系统（广州）有限公司 | Intelligent shielding signal generator and system for cell phone signals |
| CN103152121B (en) * | 2013-03-05 | 2015-08-12 | 京信通信系统（广州）有限公司 | Mobile phone signal intelligent shielding signal generator and system |
| CN106664142A (en) * | 2014-05-13 | 2017-05-10 | 美国思睿逻辑有限公司 | Systems and methods for reducing digital interference of external signals |
| CN106664142B (en) * | 2014-05-13 | 2020-04-10 | 美国思睿逻辑有限公司 | System and method for reducing digital interference of external signals |
| CN105306162A (en) * | 2015-10-29 | 2016-02-03 | 天津光电安辰信息技术有限公司 | Mixing-based recording shielding device and realizing method thereof |
| CN105306162B (en) * | 2015-10-29 | 2018-04-06 | 天津光电安辰信息技术股份有限公司 | The recording screening arrangement and its implementation of a kind of mixing |
| CN107425927A (en) * | 2017-03-30 | 2017-12-01 | 天津市德力电子仪器有限公司 | Method for rapidly detecting shielding effect of wireless signal shielding device |
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