CN101393595A - Electronic label detecting method for EAS - Google Patents
Electronic label detecting method for EAS Download PDFInfo
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- CN101393595A CN101393595A CNA2007100773090A CN200710077309A CN101393595A CN 101393595 A CN101393595 A CN 101393595A CN A2007100773090 A CNA2007100773090 A CN A2007100773090A CN 200710077309 A CN200710077309 A CN 200710077309A CN 101393595 A CN101393595 A CN 101393595A
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Abstract
The invention discloses a method for detecting electronic tags for an EAS. The method comprises the following steps: setting the electronic tags on commodities and installing detecting antennae of the EAS in a monitoring area which is formed at a passageway, wherein when a commodity with an undeactivated electronic tag passes through the monitoring area at the passageway, the EAS can detect the electronic tag through the detecting antenna and generate an alarm signal, the number of the detection antenna is at least one, and all the antennae work by turns to scan the respective monitoring area. The scanning process of each detecting antenna comprises the following steps: sending out an electromagnetic wave once; receiving the electromagnetic wave twice; calculating out the characteristic values of the two signals and comparing the characteristic values; judging whether the received signal has only one extreme value by a satisfying strip, wherein if the received signal has only one extreme value, the received signal is accounted as a suspected given signal; and performing a plurality of times of detections and judgments on the passageway repeatedly to confirm whether the received signal is the given signal. The method can effectively reduce the misinformation, improve the detection rate and reduce underreports of a system.
Description
Technical field
Type of the present invention relates to EAS (Electronic Article Surveillance), specifically is the electronic label detecting method that is used for 58KHz EAS, and the EAS (Electronic Article Surveillance) that uses this detection method.
Background technology
Traditional article detect protection system, and some antennas are installed in the going out of market (going into) mouthful.Predetermined electromagnetic wave of part antenna emission or radiowave, a part of antenna receives these energy, thereby is going out (going into) interruption-forming monitor area.When outstanding article are removed, to sense electric wave and, make electric field instantaneous variation occur attached to the label resonant tank on the article in tuning-points resonance, this variation is detected by system, and output alarm.And, when label when article are removed, or when adopting special-purpose maker deactivation device that it is lost activity, article can pass through from monitor area, and detection trigger system alarm not.
In these devices or system,, all can produce certain problem if take place to report by mistake or fail to report.Wrong report is meant that article are not moved by improper, and system or device have also sent warning.Improper move is meant that label or article protection device are damaged, and perhaps activated label or article protection device are attached to the monitor area by detection system on the article.The improper department fault to client of Chan Shenging will cause certain loss to the market thereupon, and the security personnel is also with at a loss as to what to do.The generation of wrong report is subjected to the influence of many different factors, the topmost influence that is exactly undesired signal to system, and there is careless omission in the judgement that system detects signal.Be meant that label or article protection device are damaged or during with the monitor area of article by detection system, device or system but do not give the alarm and fail to report, it is self-evident failing to report the loss that the market is brought.The generation of failing to report mainly is that the detection of antenna exists certain blind area.
Legacy system can't or be difficult to know the concrete duty of system and the details parameter of reporting to the police, thereby has also reduced the operability of system.
Summary of the invention
Technical matters to be solved by this invention provides the electronic label detecting method of a kind of EAS of being used for (Electronic Article Surveillance), uses this method can effectively reduce the generation of wrong report, can also improve verification and measurement ratio, the generation that the minimizing system is failed to report.
For solving the problems of the technologies described above, the present invention is used for the electronic label detecting method of EAS, be included in electronic tag is set on the commodity, the detection antenna of EAS is installed in formation monitored area, place, gateway, when having the commodity that do not deactivate electronic tag surveyed area and pass through from the gateway, EAS can be by detecting antenna detection to this electronic tag and produce alerting signal, it is characterized in that: the quantity of described detection antenna is at least one, all antennas take turns to operate under the MCU of EAS control, and monitored area is separately scanned; Each scanning process that detects antenna may further comprise the steps:
The first step: MCU controls this antenna and the signal transmission channel is connected, and outwards launches the 58KHz electromagnetic wave, and be t1 launch time;
Second step: behind the time-delay t2, MCU controls this antenna and the signal receiving cable is connected, and the signal that receives is imported the eigenvalue 0 that MCU calculates this signal after receiving cable is handled, and time of reception is t1;
The 3rd step: after postponing t3, MCU controls this antenna and connects with receiving cable once more, and the signal that receives is imported the eigenvalue 1 that MCU calculates this signal after receiving cable is handled, and time of reception is t1;
The 4th step: described MCU judges according to the eigenwert of twice signal that calculates whether formula 1 is set up,
λ 0〉λ 1+ Δ N....................................................... ... .. formula 1
λ 0 is the curvilinear characteristic value of the signal of the reception first time in the formula 1, and λ 1 is the curvilinear characteristic value of the signal of the reception second time, and Δ N is the initial value that system sets according to environmental interference, if formula 1 is set up, then carried out for the 5th step, otherwise, count tag is resetted, enter the scanning of next antenna;
The 5th step: MCU judges whether the signal that receives has only an extreme value, if then count tag is added 1, and carry out the first step; Otherwise, count tag is resetted, enter the scanning of next antenna;
The 6th step: judge whether described count tag equals preassigned value, if output alarm signal then, and show this antenna position; Otherwise, count tag is resetted, enter the scanning of next antenna.
Above-mentioned eigenvalue 0 and λ 1 are the index characteristic value, because label signal is a deamplification, curve satisfies index characteristic, system to signal sampling (100-200 sampled point) after, just can obtain the index characteristic value of curve according to sampled point.Eigenvalue 0 and λ 1 also can adopt the mean value of signal.
Whether the signal that MCU can adopt following method to judge and receive has only an extreme value: the value of adjacent signaling point relatively successively, if the value of a point respectively greater than the value of its left and right sides adjacent signaling point, this signaling point is exactly an extreme point; Judge the slope variation of signal curve again,, illustrate that then extreme point has only one on other aspect except that extreme point if the symbol of rate of curve (plus or minus) does not change.
A kind of EAS (Electronic Article Surveillance) that uses above-mentioned detection method, comprise detection system and the electronic tag that is arranged on the commodity, wherein, the described detection system signal transmission channel, signal receiving cable, warning device, display device and the keyboard that comprise MCU and link to each other with MCU; Also comprise the plurality of detection antenna, they are arranged at the place, gateway, every detection antenna is connected with the signal transmission channel by an emission switch, every detection antenna also is connected with the signal receiving cable by a receiving key, all emission switch all are connected with MCU with receiving key, MCU is by the control to emission switch and receiving key, making all detect antenna takes turns to operate, monitored area is separately scanned, detected the commodity that whether have band not deactivate electronic tag and pass through from the monitored area.
Further, above-mentioned each detection antenna includes housing, be arranged side by side two tours antennas in the housing from top to bottom, two tours antennas connect by switch two emission power amplifier output terminals opposite with phase place in the signal transmission channel respectively, two tours antennas are worked simultaneously to the monitored area launching electromagnetic wave, produce more uniform energy distribution zone, reduce and detect the blind area, thereby reach the generation that the minimizing system is failed to report, improve the purpose of verification and measurement ratio.
The present invention adopts multiple mode decision signal and removes and disturb, can effectively reduce the generation of wrong report, and when a certain antenna monitors doubtful previously arranged signal, after this antenna is finished the single pass process, do not enter the scanning of next antenna, but this antenna multiple scanning repeatedly (for example can be set at three times), whether be previously arranged signal to confirm doubtful previously arranged signal, thereby can further hang down the generation of wrong report.Previously arranged signal is meant the signal of energy triggering system output alarm, and doubtful previously arranged signal is the signal similar to previously arranged signal.
Owing to be arranged side by side two independently tours antennas in every detection antenna, and two opposite with phase place in the signal transmission channel respectively emission power amplifier output terminals connect, when scanning, can produce more uniform energy distribution zone, detect blind area, the generation that the minimizing system is failed to report thereby can reduce.
Description of drawings
Fig. 1 is the theory diagram of present embodiment EAS;
Fig. 2 is the structural representation of its every antenna;
Fig. 3 is the structural representation of its main control box;
Fig. 4 is the process flow diagram of Control Software;
Fig. 5 is the working timing figure of antenna, four antenna operate as normal sequential.
Embodiment
Be that example describes with four detection antennas in the present embodiment, can a detection antenna, two detection antennas or a plurality of detection antenna be set according to the size and the quantity of gateway in the practical application.Every detection antenna forms a monitored area, and when every detection antenna was started working, first launching electromagnetic wave received then, and the signal of reception enters MCU through the signal receiving cable and handles, thereby every detection antenna becomes a channel.
With reference to Fig. 1, this Electronic Article Surveillance comprises detection system and the electronic tag that is arranged on the commodity, wherein, detection system comprises MCU 101 and the signal transmission channel that links to each other with MCU 101, signal receiving cable, warning device 110, display device 111 and keyboard 112; Also comprise plurality of detection antenna 104, detect antenna 104 and be arranged at the place, gateway, every detection antenna 104 is connected with the signal transmission channel by an emission switch 105, every detection antenna 104 also is connected with the signal receiving cable by a receiving key 106, all emission switch 105 all are connected with MCU 101 with receiving key 106, MCU 101 is by the control to emission switch 105 and receiving key 106, making all detect antenna takes turns to operate, monitored area is separately scanned, detected the commodity that whether have band not deactivate electronic tag and pass through from the monitored area.
The signal transmission channel comprises 58KHz pulse shaping circuit 102 and is connected to the power amplification circuit 103 of these 58KHz pulse shaping circuit 102 output terminals; Described signal receiving cable comprises reception amplifying circuit 107,58KHz bandpass filtering amplifying circuit 108 and the low-pass filter circuit 109 that connects successively.
This system adopts the 58KHz pulse as detection signal, and emittance also adopts this frequency.Under the control of MCU 101,58KHz pulse shaping circuit 102 produces the pulse signal of 58KHz, after this signal amplifies by power amplification circuit 103, is divided into four road signals and enters four antennas respectively by the work schedule of system.When certain antenna emission switch 105 was opened, this antenna was launched this electromagnetic wave, formed the monitored area.System is not when detecting previously arranged signal or doubtful previously arranged signal, and No. four antennas 104 are in the state that takes turns to operate chronologically.When divided antenna receiving key 106 is opened, antenna is in accepting state, signal is by after receiving amplifying circuit 107 and 108 filtering of 58K bandpass filtering amplifying circuit amplification, the frequency that enters 109 pairs of signals of low-pass filter circuit is carried out gating, is sent back to MCU through the signal after a series of processing and differentiates.When a certain road detects doubtful previously arranged signal, under the control of MCU101, three of in the antenna emission switch 105 other are closed, antenna 104 stops launching electromagnetic wave, and that road antenna emission switch 105 that detects doubtful previously arranged signal keeps and opens duty, and this road antenna 104 works on, repeat its transmission and receiving three times, whether send signal back to MCU 101 and differentiate after above-mentioned similar processing, be previously arranged signal to confirm.When system validation is when detecting previously arranged signal, MCU 101 drives warning devices 110 and sends alerting signal, and demonstrates the passage of warning by display device 111, promptly detects the antenna channels of previously arranged signal emittance.Keyboard 112 is used for manually selecting the mode of operation of antenna, sets the predetermined value of noise etc. according to environmental interference.
With reference to Fig. 2, every detection antenna includes housing 200, be arranged side by side two tours antennas 201 and 202 in the housing 200 from top to bottom, two tours antennas 201 are connected by two opposite with phase place in the signal transmission channel respectively emission power amplifier output terminals of emission switch with 202, under the control of switch, two tours antennas 201 and 202 always are in same duty, i.e. emission simultaneously or receive electromagnetic wave.Last antenna 201 and following antenna 202 are worked simultaneously and are anti-phase, thereby behind the energy superposition, it is more even that the energy distribution of entire antenna becomes.This antenna structure has significantly reduced the blind area of detecting, and has increased the scope that detects.
Fig. 3 is the structure wiring layout of this Electronic Article Surveillance main control box.The work of main control box control system, the working method of antenna etc.With reference to Fig. 3, the main control box comprises: base plate 308, on position, some holes is arranged, be used to install other parts, and the heat radiation of control enclosure etc.; 301 pairs of control enclosurees of a loam cake seal, and the object in the control enclosure is protected; A radiating circuit plate 304 is installed on the base, and the work when control antenna is in the emittance state comprises the frequency of emittance and work schedule etc.; A wave filter 305 is used for the energy of gating certain frequency, shields the interference of the energy of other frequency; In a side of control enclosure, a button circuit board 306,307 is installed, plurality of keys is arranged above, the duty of control and selective system, other has a LCDs, the duty of display system, parameters such as alarm condition; Keytop has the PVC material that it is protected; Because is to be in closed state during the control enclosure operate as normal, except that there were some louvres the side, a fan 310 was also installed in the side, and control enclosure is dispelled the heat, avoid system's temperature influence and be in steady-working state.In the opposite flank of keyswitch, be power input plug 311, civilian alternating current enters control enclosure from plug, and system is powered.Be circuit board for receiving 302 below loam cake, the work when control antenna is in the received radiation energy state comprises the received radiation energy, and the energy that receives is selected processing such as amplification, and the input controller is differentiated; A shield blade 303 is arranged between radiating circuit plate 304 and circuit board for receiving 302, prevent that the radiating circuit plate from disturbing the direct radiation of circuit board for receiving.Between all parts, adopt the screw 309 of some to couple together.
The present invention is by being provided with electronic tag on commodity, the detection antenna of EAS is installed in formation monitored area, place, gateway, when have the commodity that do not deactivate electronic tag from the monitored area of gateway by the time, EAS can be by detecting antenna detection to this electronic tag and produce alerting signal; Described all antennas are to take turns to operate under MCU control, and monitored area is separately scanned; With reference to Fig. 4, each scanning process that detects antenna may further comprise the steps:
The first step: opening timing, determine that the work schedule S408 of antenna, MCU control this antenna and the signal transmission channel is connected, outwards launch the 58KHz electromagnetic wave, be the t1 (S409 of 1ms＜t1＜10ms) launch time;
Second step: time-delay t2 is (behind the t1＜t2), MCU controls this antenna and the signal receiving cable is connected, the eigenvalue 0 that the signal input MCU after receiving cable is handled that receives is calculated this signal (adopts the index characteristic value here, because label signal is a deamplification, curve satisfies index characteristic, system to a signal sampling 100-200 sampled point after, just can obtain the index characteristic value of curve according to sampled point), time of reception is t1S410;
The 3rd step: postpone t3 (the back S411 of t2＜t3), MCU controls this antenna and connects with receiving cable once more, the eigenvalue 1 that the signal input MCU after receiving cable is handled that receives is calculated this signal (adopts the index characteristic value here, because label signal is a deamplification, curve satisfies index characteristic, system to a signal sampling 100-200 sampled point after, just can obtain the index characteristic value of curve according to sampled point), time of reception is t1S412;
The 4th step: described MCU judges according to the eigenvalue 0 and the λ 1 of twice signal that calculates whether formula 1 sets up S413,
λ 0〉λ 1+ Δ N....................................................... ... .. formula 1
λ 0 is the index characteristic value of the signal of the reception first time in the formula 1, and λ 1 is the index characteristic value of the signal of the reception second time, and Δ N is the initial value that system sets according to environmental interference, if formula 1 is set up, then carried out for the 5th step, otherwise, F1age resets with count tag, enters the scanning S418 of next antenna;
The 5th step: MCU judges whether the signal that receives has only an extreme value S414, if then count tag Flage is added 1S415, and carry out the first step; Otherwise Flage resets with count tag, enters the scanning S418 of next antenna;
The 6th step: judge whether described count tag equals preassigned value S416, if output alarm signal then, and the display label signal appears at the monitored area S417 of which antenna; Otherwise Flage resets with count tag, enters the scanning S418 of next antenna.
In the step 5, MCU adopts following method to judge whether the signal that receives has only an extreme value: face the value of signaling point successively mutually, if the value of a point respectively greater than the value of facing signaling point about it mutually, this signaling point is exactly an extreme point; Judge the slope variation of signal curve again,, illustrate that then extreme point has only one on other aspect except that extreme point if the symbol of rate of curve (plus or minus) does not change.
Initialization step when also comprising start among Fig. 4, i.e. master controller initialization IO mouth S402 is in each circuit module and treats duty.Initialization display screen S403 then is to show the duty of present system, the information of environmental interference etc.Under the control of controller, starting impulse produces circuit, produces 58KHz square-wave signal S404, and signal is sent into antenna, forms the monitor protection zone as detection signal in presumptive area.The simultaneity factor keyboard scan also is display process S405.After initialization was finished, system judged whether synchronous S406, if just do not adjust synchronously earlier synchronously, if synchronous, entered phase place and adjusted S407.
Comprise that also MCU produces synchronizing signal, adjust the work schedule of each antenna, antenna is taken turns to operate according to a stable sequential.
Four detection antenna order time-sharing works, be after system opens, first antenna started working, after first a period of time that quits work and delay time, second antenna started working, so in proper order, and after the 4th antenna quits work and delays time a period of time, start working again for first, constantly circulation is gone down.The work of every antenna all is divided into two states.The i.e. state of the state of an emitted energy and twice received energy.Specifically be antenna when starting working, transmission frequency is the energy signal of 58KHz, (stops behind 1ms＜t1＜10ms) through t1.After time-delay a period of time, received energy again.After time-delay a period of time, repeat received energy once.After twice received energy finished, an antenna was finished one action.The working timing figure of each antenna as shown in Figure 5, antenna adopts the frequency of the frequency (50Hz) of civilian alternating current as synchronizing signal 505.What this figure reflected is the work schedule of every antenna when not detecting previously arranged signal or doubtful previously arranged signal, and wherein each black fritter is represented the complete course of work of respective antenna, i.e. once emission and twice reception.Behind the system boot, 501 work of first antenna, synchronous with synchronizing signal 505 at this moment, the time that second antenna 502 started working is with respect to first antenna, 501 time-delay 13.3ms.The 3rd antenna 503 is with respect to second antenna 502 13.3ms that also delays time.The 4th time that antenna 504 is started working does not refer again to the 3rd antenna 503, but synchronous with synchronizing signal 505.After passing through the time-delay of 26.6ms again, the 3rd antenna 503 is synchronous with synchronizing signal 505 again.So circulation is gone down.
In addition during system start-up with automatic testing environment noise, in controller is differentiated, will consider this The noise.The 58KHz label signal detects and adopts a series of pulse signals.When transponder pulse produces, produce detection window at once, but system still keeps detection window and noise identification window respectively, when receiver was idle, all 1.6ms audit windows all were called the noise identification window.When pulse transmission phase of line constantly was selected, receiver phase place was for this reason set up detection window, and kept the two-way audit window to keep noise identification.First window of every class is a detection window, and second window is the noise identification window, so so that detect the arrival of previously arranged signal.In the case, the following two row windows that are close to are used for noise identification.Noise in the band that occurs in any noise detecting window must be lower than the controlling alarm thresholding, if surpassed this thresholding, processor will be reported to the police and be suppressed and the effectively identification that resets.
To the interference between system, adopt the keyboard setting, the work schedule of Adjustment System, make system works at dual mode: synchronous working mode, different system enter emission or received radiation energy state simultaneously, interfere with each other between system avoiding; The asynchronous working mode, promptly different system enters emission or moment of received radiation energy state staggers fully, so does not also have the problem that interferes with each other between system.
Claims (9)
1, a kind of electronic label detecting method that is used for EAS, be included in electronic tag is set on the commodity, the detection antenna of EAS is installed in formation monitored area, place, gateway, when having the commodity that do not deactivate electronic tag when the monitored area of gateway is passed through, EAS can is characterized in that by detecting antenna detection to this electronic tag and produce alerting signal:
The quantity of described detection antenna is at least one, and all antennas take turns to operate under the MCU of EAS control, and monitored area is separately scanned; Each scanning process that detects antenna may further comprise the steps:
The first step: MCU controls this antenna and the signal transmission channel is connected, and outwards launches the 58KHz electromagnetic wave, and be t1 launch time;
Second step: behind the time-delay t2, MCU controls this antenna and the signal receiving cable is connected, and the signal that receives is imported the eigenvalue 0 that MCU calculates this signal after receiving cable is handled, and time of reception is t1;
The 3rd step: after postponing t3, MCU controls this antenna and connects with receiving cable once more, and the signal that receives is imported the eigenvalue 1 that MCU calculates this signal after receiving cable is handled, and time of reception is t1;
The 4th step: described MCU judges according to the eigenwert of twice signal that calculates whether formula 1 is set up,
λ 0〉λ 1+ Δ N....................................................... ... .. formula 1
λ 0 is the curvilinear characteristic value of the signal of the reception first time in the formula 1, and λ 1 is the curvilinear characteristic value of the signal of the reception second time, and Δ N is the initial value that system sets according to environmental interference, if formula 1 is set up, then carried out for the 5th step, otherwise, count tag is resetted, enter the scanning of next antenna;
The 5th step: MCU judges whether the signal that receives has only an extreme value, if then count tag is added 1, and carry out the first step; Otherwise, count tag is resetted, enter the scanning of next antenna;
The 6th step: judge whether described count tag equals preassigned value, if output alarm signal then, and the display label signal appears at the monitored area of which antenna; Otherwise, count tag is resetted, enter the scanning of next antenna.
2, the electronic label detecting method that is used for EAS according to claim 1, it is characterized in that: described each detection antenna includes housing, be arranged side by side two tours antennas in the housing from top to bottom, two tours antennas connect by switch two emission power amplifier output terminals opposite with phase place in the signal transmission channel respectively, under the control of switch, two tours antennas always are in same duty, i.e. emission simultaneously or reception electromagnetic wave.
3, the electronic label detecting method that is used for EAS according to claim 1, it is characterized in that: in step 5, MCU adopts following method to judge whether the signal that receives has only an extreme value: the value that compares adjacent signaling point successively, if greater than the value of its left and right sides adjacent signaling point, this signaling point is exactly an extreme point to the value of a point respectively; Judge the slope variation of signal curve again,, illustrate that then extreme point has only one on other aspect except that extreme point if the symbol of rate of curve (plus or minus) does not change.
4, the electronic label detecting method that is used for EAS according to claim 1 is characterized in that: described eigenvalue 0 and λ 1 are the index characteristic value.
5, the electronic label detecting method that is used for EAS according to claim 1 is characterized in that: comprise that also MCU produces synchronizing signal, adjust the work schedule of each antenna, antenna is taken turns to operate according to a stable sequential.
6, the electronic label detecting method that is used for EAS according to claim 1 is characterized in that:
Described signal transmission channel comprises that the 58KHz pulse signal forms circuit and is connected to the power amplification circuit that this 58KHz pulse signal forms circuit output end, and signal transmission channel output terminal detects antenna respectively by some emission switch and is connected with each;
Described signal receiving cable comprises reception amplifying circuit, 58KHz bandpass filtering amplifying circuit and the low-pass filter circuit that connects successively, the input end of signal receiving cable detects antenna respectively by some receiving keys and is connected its output termination MCU input end with each; All emission switch and receiving key are controlled by MCU.
7, a kind of Electronic Article Surveillance that adopts the described method of claim 1, comprise detection system and the electronic tag that is arranged on the commodity, it is characterized in that: signal transmission channel, signal receiving cable, warning device, display device and keyboard that described detection system comprises MCU and links to each other with MCU; Also comprise the plurality of detection antenna, they are arranged at the place, gateway, every detection antenna is connected with the signal transmission channel by an emission switch, every detection antenna also is connected with the signal receiving cable by a receiving key, all emission switch all are connected with MCU with receiving key, MCU is by the control to emission switch and receiving key, making all detect antenna takes turns to operate, monitored area is separately scanned, detected the commodity that whether have band not deactivate electronic tag and pass through from the monitored area.
8, Electronic Article Surveillance according to claim 7, it is characterized in that: every detection antenna includes housing, be arranged side by side two tours antennas in the housing from top to bottom, two tours antennas connect by two opposite with phase place in the signal transmission channel respectively emission power amplifier output terminals of emission switch, under the control of switch, two tours antennas always are in same duty, i.e. emission simultaneously or reception electromagnetic wave.
9, Electronic Article Surveillance according to claim 8 is characterized in that: described signal transmission channel comprises that the 58KHz pulse signal forms circuit and is connected to the power amplification circuit that this 58KHz pulse signal forms circuit output end; Described signal receiving cable comprises reception amplifying circuit, 58KHz bandpass filtering amplifying circuit and the low-pass filter circuit that connects successively.
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| CN2007100773090A CN101393595B (en) | 2007-09-19 | 2007-09-19 | Electronic label detecting method for EAS |
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| CN2862213Y (en) * | 2005-11-04 | 2007-01-24 | 深圳蓉华电子有限公司 | Dactivate,activate and detecting device for electromagnetic wave anti-theft label |
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| CN107077773A (en) * | 2014-08-12 | 2017-08-18 | 泰科消防及安全有限公司 | Realize the eas system for the method for determining safety label position |
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| WO2016107016A1 (en) * | 2014-12-31 | 2016-07-07 | 杭州思创汇联科技有限公司 | Sensor-based data recognition system capable of real-time response |
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| CN108010243A (en) * | 2017-12-19 | 2018-05-08 | 徐州龙安电子科技有限公司 | A kind of audio magnetic label and the market sound magnetic EAS system using the audio magnetic label |
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| CN101393595B (en) | 2010-04-21 |
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