CN1292390C - Digital electronic label detector and its detection method - Google Patents
Digital electronic label detector and its detection method Download PDFInfo
- Publication number
- CN1292390C CN1292390C CN 200410051877 CN200410051877A CN1292390C CN 1292390 C CN1292390 C CN 1292390C CN 200410051877 CN200410051877 CN 200410051877 CN 200410051877 A CN200410051877 A CN 200410051877A CN 1292390 C CN1292390 C CN 1292390C
- Authority
- CN
- China
- Prior art keywords
- signal
- digital
- label
- frame
- digital signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Radar Systems Or Details Thereof (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The present invention relates to a digital electronic label detection device which is arranged at a receiving end of an EAS system. The present invention is characterized in that the digital electronic label detection device is mainly formed by jointly connecting a digital signal processor, a filter, an A/D converter, a switch array and a drive circuit. The present invention also relates to a method for detecting digital electronic labels by the device. The digital signal processing technology is adopted to analyze and identify detected signals for replacing the traditional analog label detection circuit. The present invention increases the detection distance of the EAS system, and reduces the rate of false alarm of the EAS system.
Description
Technical field
The present invention relates to a kind of detection of electrons method, particularly a kind of electronic article thief-proof (ElectronicArticle Surveillance, EAS) detection method of the digital electric subtab of system of being used for.
Technical background
Along with the rise of large scale commercial product marketing centers such as superstore, the sales mode of open-shelf becomes the prevailing model of merchandise sales gradually.Compare with traditional sales counter sales mode, self service can allow client freely select the commodity of liking, and need not both provided the shopping environment of a free and loose through waiter for client, simultaneously also reduce required staff, reduced the cost of operation.But then, self service has also increased the stolen possibility of commodity greatly.
Thief-proof (the Electronic Article Surveillance of electronic article, EAS) system is a kind of thief-proof electronic detection system in market that is widely used in, it is installed on the exit in market usually, by the detection to electronic tag on the arrearage commodity, can prevent the loss of commodity effectively.But in traditional EAS system, the detection of electronic tag adopts mimic channel to finish.Because the limitation of analogy method, the label testing circuit of traditional E AS system is difficult to accurately detected signal be analyzed and discerned, it is narrower not only to detect distance, and be easy to be subjected to the influence of external interference and produce false-alarm newspaper, for example knock under the situations such as antenna, hand touch antenna in outside electromagnetic interference, metal object, the EAS system of traditional analog all might produce alarm, causes market and client's dispute easily.
Summary of the invention
The objective of the invention is to shortcomings such as, rate of false alarm height little at traditional analog EAS system sensing range, a kind of thief-proof (Electronic Article Surveillance of electronic article that is used for is provided, EAS) detection method of the digital electric subtab of system, adopt Digital Signal Processing to come detected signal is analyzed and discerned, to substitute traditional simulation label testing circuit, increase the detection distance of EAS system, reduce the rate of false alarm of EAS system.
For the clear the inventive method of describing, introduce the device that the inventive method adopts here earlier.
The digital electronic tag detection device that the present invention adopts and other part annexations of EAS system as shown in Figure 1, wherein dotted portion is apparatus of the present invention.This device is installed between receiving antenna and the warning circuit, and its input end is connected with the signal output part of receiving antenna, and its output terminal is connected with the input end of warning circuit.The function of this device is that the signal that antenna is exported is detected, if detect label signal, then sends alerting signal to warning circuit.
Digital electronic tag detection device structure of the present invention is shown in Fig. 2 dotted portion, mainly connected and composed jointly by digital signal processor, wave filter, A/D converter, switch arrays, driving circuit, its annexation is: the output terminal of wave filter is connected with the input end signal of A/D converter; The output terminal of A/D converter is connected with the digital signal processor signal; Switch arrays are connected with the digital signal processor signal; Digital signal processor is connected with the input end signal of driving circuit;
The output terminal of driving circuit is by the external warning circuit of signal wire; The input end of wave filter is by the external receiving antenna of signal wire.
A/D converter is an A/D converter.
Digital signal processor is the core of total system, its major function is for analyzing the antenna output signal after process filtering, sampling, the quantification, judge whether it is label signal, if detect label signal then send alerting signal, in addition, digital signal processor also is provided with the frequency of operation of system, soft/parameters such as hard label selection according to the difference of switch setting; The function of wave filter is to detect irrelevant frequency component and anti-aliasing with label in the filtering antenna output signal; The function of A/D converter is a digital signal for the analog signal conversion with input; The function of switch arrays is that different switches is provided with the different system operational parameters setting of representative; The function of driving circuit provides driving for the alerting signal for digital signal processor output.
As shown in Figure 3, the device provided by the invention method that is used to detect the digital electric subtab may further comprise the steps:
(1) use wave filter that antenna output signal is carried out filtering, filtering and label detect irrelevant frequency component and anti-aliasing, and filtered signal is converted to digital signal supplied with digital signal processor with A/D converter;
(2) in the digital signal processor, the input signal after filtering, sampling and quantification is carried out the branch frame handle, the setting of frame length should guarantee that a frame can comprise several modulation signal cycles;
(3) input signal of present frame is carried out periodicity detects and the cycle is estimated, inequality if input signal does not have the modulation period that periodicity or cycle and switch arrays sets, then adjudicating present frame is non-label signal, and forwards step (5) to;
(4) feature of extraction input signal, the tag types that sets according to switch arrays loads corresponding tag template, and compares with the feature of input signal, if marked difference is arranged, then adjudicating present frame is non-label signal, otherwise the judgement present frame is a label signal;
(5) court verdict of counting frame according to present frame and front carries out cascading judgement, is label signal as the court verdict of most frames, and then output alarm signal is to driving circuit;
(6) upgrade the past frame parameter of being deposited, forward step (1) to and proceed.
Wherein, input signal cycle detection and cycle are estimated to adopt correlation method, average amplitude difference method or both combinations in the step (3).
Input signal feature described in the step (4) can adopt adaptive filter coefficient, second moment, high-order statistic or their combination.
The present invention compared with prior art have a following advantage:
1, adopts Digital Signal Processing to come detected signal is analyzed and discerned, can increase the detection distance of EAS system effectively, and reduce the rate of false alarm of system significantly.
2, can running parameters such as modulating frequency, tag types be regulated by revising the setting of program parameter in the digital signal processor, have favorable compatibility.
3, the upgrading of system can realize by the label trace routine of changing more excellent performance, need not to redesign circuit, and is easy to operate, also saved the cost of system upgrade simultaneously.
Description of drawings
Fig. 1 is the annexation figure of digital electronic tag detection device provided by the invention and other ingredients of EAS system;
Fig. 2 is a digital electronic tag detection device circuit block diagram of the present invention;
Fig. 3 is used for the process flow diagram that label detects for digital electronic tag detection device of the present invention;
Fig. 4 is the circuit theory diagrams of embodiment;
Fig. 5 is the main program flow chart of embodiment.
Five, embodiment
A kind of concrete embodiment of the present invention is as follows:
(1) circuit theory diagrams of hardware: embodiment as shown in Figure 4, wherein IC1 is a DSP chip, IC2 is the A/D conversion chip.Digital signal processing chip is the key component that label detects, and multiple choices is arranged, as 16 bit DSP chip TMS320C5409 of TI company, the ADSP2181 of AD company etc.; The A/D chip can adopt 320AC36; Wave filter can adopt Butterwoth filter to realize; Driving circuit can adopt discharge circuit to realize; Switch arrays can adopt the microswitch array to realize.
(2) software: software of the present invention mainly is meant the label trace routine of moving in the digital signal processor, and the program flow diagram of embodiment as shown in Figure 5.
After start powers on, at first carry out initial work, comprise the input block (buffer size is the length of frame data) of setting parameters such as modulating frequency in the trace routine, tag types, signalization according to being provided with of switch etc.After finishing above-mentioned work, enter the master routine circulation.
In the master routine circulation, constantly detect buffer zone full scale will.After detecting buffer zone full scale will, frame input data are received in expression, enter the label testing process.
In the label testing process, at first current frame data is carried out that periodicity detects and the cycle is estimated, the present embodiment employing be correlation method, average amplitude difference method or method that both combine also can realize same function in addition.When the periodicity of signal and cycle were not satisfied requiring of label signal, the judgement present frame was non-label signal, and enters the cascading judgement stage.When the periodicity of signal and cycle are satisfied requiring of label signal, extract the feature of signal, and compare with set tag template, obtain the court verdict of this frame.The feature of signal adopts adaptive filter coefficient in the present embodiment, and second moment, high-order statistic or their combination also can realize same function in addition.The court verdict of counting frame according to present frame and front carries out cascading judgement, is label signal as most frame court verdicts, and then output alarm signal is to driving circuit.
After finishing the label testing process, upgrade the data of preserving in the past, and get back to the master routine round-robin and begin, wait for the input of new data.
(3) install: after making circuit board, write and depositing software program in; the present invention can adopt mode as shown in Figure 1 to insert the EAS system; its installation site can adopt with traditional analog EAS system in the similar mode of label testing circuit; promptly be installed on the antenna base, and install metal shell protection additional.The output terminal of antenna and the input end of warning circuit are connected to input end of the present invention and output terminal.
Claims (3)
1, a kind of detection method of digital electric subtab is characterized in that may further comprise the steps:
(1) use wave filter that antenna output signal is carried out filtering, filtering and label detect irrelevant frequency component and anti-aliasing, and filtered signal is converted to digital signal supplied with digital signal processor with A/D converter;
(2) in the digital signal processor, the input signal after filtering, sampling and quantification is carried out the branch frame handle, the setting of frame length should guarantee that a frame can comprise several modulation signal cycles;
(3) input signal of present frame is carried out periodicity detects and the cycle is estimated, inequality if input signal does not have the modulation period that periodicity or cycle and switch arrays sets, then adjudicating present frame is non-label signal, and forwards step (5) to;
(4) feature of extraction input signal, the tag types that sets according to switch arrays loads corresponding tag template, and compares with the feature of input signal, if marked difference is arranged, then adjudicating present frame is non-label signal, otherwise the judgement present frame is a label signal;
(5) court verdict of counting frame according to present frame and front carries out cascading judgement, is label signal as the court verdict of most frames, and then output alarm signal is to driving circuit;
(6) upgrade the past frame parameter of being deposited, forward step (1) to and proceed;
Realize that the digital electronic tag detection device that described method adopts is is mainly connected and composed jointly by digital signal processor, wave filter, A/D converter, switch arrays, driving circuit, its annexation is: the output terminal of wave filter is connected with the input end signal of A/D converter; The output terminal of A/D converter is connected with the digital signal processor signal; Switch arrays are connected with the digital signal processor signal; Digital signal processor is connected with the input end signal of driving circuit;
The output terminal of driving circuit is by the external warning circuit of signal wire; The input end of wave filter is by the external receiving antenna of signal wire.
2, method according to claim 1 is characterized in that input signal cycle detection and cycle estimation employing correlation method, average amplitude difference method or both combinations in the step (3).
3, method according to claim 1 and 2 is characterized in that the input signal feature described in the step (4) adopts adaptive filter coefficient, second moment, high-order statistic or their combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051877 CN1292390C (en) | 2004-10-20 | 2004-10-20 | Digital electronic label detector and its detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051877 CN1292390C (en) | 2004-10-20 | 2004-10-20 | Digital electronic label detector and its detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1601546A CN1601546A (en) | 2005-03-30 |
| CN1292390C true CN1292390C (en) | 2006-12-27 |
Family
ID=34666020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410051877 Expired - Fee Related CN1292390C (en) | 2004-10-20 | 2004-10-20 | Digital electronic label detector and its detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1292390C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7733290B2 (en) * | 2005-12-19 | 2010-06-08 | Sensormatic Electronics, LLC | Merchandise surveillance system antenna and method |
| CN100476855C (en) * | 2006-03-22 | 2009-04-08 | 中国科学院自动化研究所 | Testing method for object exterior pasting electronic label and packaging materials selection |
| CN108734911A (en) * | 2017-04-17 | 2018-11-02 | 深圳中安安防科技有限公司 | Hidden electronic article surveillance detection device and its detection method |
| CN109859716B (en) * | 2019-04-09 | 2021-02-05 | 上海中航光电子有限公司 | Liquid crystal display panel, display device and driving method |
-
2004
- 2004-10-20 CN CN 200410051877 patent/CN1292390C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1601546A (en) | 2005-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102016607B (en) | Method and apparatus for analyzing waveform signals of a power system | |
| CN107095669B (en) | A kind of processing method and system of epileptic's EEG signals | |
| CN110728258B (en) | Step detection method and system based on front-back frame connected domain matching | |
| CN110225444A (en) | A kind of fault detection method and its detection system of microphone array system | |
| CN1292390C (en) | Digital electronic label detector and its detection method | |
| CN113205037A (en) | Event detection method and device, electronic equipment and readable storage medium | |
| CN102891761A (en) | Method and device for predicting equipment performance | |
| WO2024067837A1 (en) | Method and apparatus for determining device stability, computer device and storage medium | |
| CN113687164A (en) | Non-invasive load event two-stage self-adaptive detection method | |
| CN101672823B (en) | System and method for the online detection of magnetic materials | |
| CN117540235B (en) | Real-time monitoring method for temporary electricity utilization abnormal data | |
| CN111912513A (en) | Identification method of excavator construction event along optical cable based on phi-OTDR | |
| CN113849374B (en) | CPU occupancy rate prediction method, system, electronic device and storage medium | |
| CN2760675Y (en) | Digital electronic label detecting device | |
| CN112215210A (en) | AI and HMM-based elevator electric vehicle recognition and early warning method | |
| CN116304761A (en) | Working condition type analysis method and device, electronic equipment and storage medium | |
| CN102881099B (en) | Anti-theft alarming method and device applied to ATM | |
| CN114557707B (en) | Sleep electroencephalogram signal amplitude analysis method based on gradual change and other state distribution | |
| CN101206784A (en) | Digital intelligent wireless radio frequency anti-theft detector and detecting method | |
| JP4106253B2 (en) | Partial discharge detector | |
| CN112258458B (en) | Detection method and system for super high-rise concrete pump pipe based on thermal imaging identification | |
| CN113642421A (en) | Event detection method, system, equipment and storage medium for periodic multi-state electric appliance | |
| CN113792477A (en) | Power utilization abnormity identification method, system and device and fire early warning system | |
| CN101382593B (en) | Method for detecting weak low frequency signal form unknown strong frequency conversion signal | |
| CN110033468A (en) | A kind of object removes detection method, device and terminal device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20061227 Termination date: 20091120 |