Phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection device

Abstract

The application relates to a phase synchronization debugging method applied to an acoustic-magnetic electronic article surveillance detection device, which can not only improve the identification efficiency of an interference source, but also has fast antenna synchronization phase parameter adjustment speed. A digital signal processor in the acoustic-magnetic electronic article surveillance detection device obtains a periodically-appearing antenna signal collection starting point by processing a square wave signal of a commercial power frequency; the digital signal processor draws a graph according to the data collected by the acoustic-magnetic antenna and compares and identifies the drawn graph with a standard graph; then the digital signal processor moves a synchronization phase value according to calculated phase data of an interference antenna, so that the acoustic-magnetic antenna and the interference acoustic-magnetic antenna realize synchronous emission. Advantages: firstly, the total time for one-time phase synchronization debugging is not more than 3 minutes, and all the home acoustic-magnetic antennas in the same interference area can be batch-adjusted through one-time phase synchronization debugging.

Description

Technical Field

[0001] This invention belongs to the technical field of electronic product anti-theft systems, specifically relating to a phase synchronization debugging method for acousto-magnetic electronic product anti-theft detection equipment. Background Technology

[0002] Electronic Article Surveillance (EAS) systems are one of the most widely used product security measures in the large retail industry. There are three main technologies used in EAS systems: radio frequency (RF) technology, electromagnetic technology, and acousto-magnetic (AM) technology. Among them, AM technology utilizes the physical principle that a tuning fork will resonate only when oscillation frequencies are the same, achieving near-zero false alarm operation. Therefore, the application of AM systems is becoming increasingly widespread.

[0003] When acousto-magnetic antennas are used in large retail stores or large commercial complexes, different brands of stores use antenna anti-theft products from different manufacturers, and these brands employ different antenna synchronization technologies (such as AC zero-crossing synchronization detection, external signal pulse synchronization, and self-organizing network synchronization, etc.). Currently, the most widely used antenna synchronization technology is AC zero-crossing synchronization detection. AC zero-crossing synchronization detection technology (such as...) Figure 4 As shown in the figure, which is a waveform diagram of AC mains zero-crossing synchronization detection, the AC signal is converted into a square wave signal of the mains frequency by detecting the zero point of the AC mains. The antenna obtains the starting point of the antenna operation based on the rising or falling edge of the square wave signal, and sets the antenna's transmission and reception time according to the starting point.

[0004] Although different brands of acousto-magnetic antennas all use mains zero-crossing synchronous detection technology, the starting point of operation varies between manufacturers. This inconsistency is generally caused by three reasons: 1. Mains power has live and neutral wires, resulting in a 180° phase difference in zero-crossing detection; 2. Mains power is a three-phase five-wire system, resulting in A-phase, B-phase, and C-phase power, each with a 120° phase difference; 3. Different manufacturers use different zero-crossing detection circuit methods, and electronic components such as transformers, capacitors, and resistors in the circuit all contribute to a phase delay of the mains power.

[0005] The influence of one or more of the above three reasons can cause the phase electricity used by different stores in a retail supermarket or a large commercial complex to be inconsistent, causing the working starting point of the antenna to be inconsistent, the antennas of different stores to interfere with each other, and the antennas to not work normally; the mutual interference of the antennas of different stores causes the antennas to not work normally, and the following phenomena can occur: one is that the antenna cannot detect the anti-theft tag (such as the working starting point of different stores being inconsistent, which can cause the 58KHz signal window emitted by the antenna of store A to fall on the signal receiving window of the antenna of store B, causing the received signal of the receiving window of store B to be much larger than the received anti-theft tag signal, and the tag signal being completely submerged by the emitted signal of store A, so that the antenna cannot identify the anti-theft tag when the anti-theft tag passes through the detection area of the antenna), and the other is that the antenna can falsely alarm when there is no anti-theft tag passing through the detection area (the frequency and amplitude of the received antenna emitted signal of store B meet the tag frequency and alarm threshold of the antenna, which can cause the antenna to falsely alarm when there is no anti-theft tag passing through the detection area, and the store can think that the antenna anti-theft device has been damaged and cannot provide the anti-theft alarm prompt function).

[0006] At present, when the antenna cannot work normally, the customer will notify the technical maintenance personnel of the antenna to repair and debug the device, and the technical maintenance personnel can identify the interference source of the antenna by combining the size of the noise indicator light on the antenna mainboard, the detection distance of the antenna, and the installation situation of the antenna device of the nearby store with experience, which not only has relatively low identification efficiency, but also requires the technical maintenance personnel to have certain working experience; in addition, when it is judged that the interference source of the antenna is the mutual interference between the antennas of different stores, the synchronization phase parameter of the antenna needs to be adjusted to make the antennas of different brand stores work synchronously, emit together, receive together, not interfere with each other, and work in coordination, but the maintenance personnel only know the phase parameter of the antenna of the product of the company, and do not know the phase parameter of the antenna of the product of other companies, at this time, the phase parameter of the antenna of the company is adjusted to the synchronization phase parameter of the antenna of the product of other companies, and the maintenance personnel need to blindly adjust, which not only has low adjustment efficiency, but also has high working intensity of the technical maintenance personnel. SUMMARY

[0007] Design purpose: in order to avoid the shortcomings in the background art, a phase synchronization debugging method applied to an acoustic-magnetic electronic commodity anti-theft detection device is designed, which can not only improve the identification efficiency of the interference source, but also has relatively low requirement on the working experience of the maintenance personnel, and can quickly adjust the synchronization phase parameter of the antenna, and can also reduce the working intensity of the technical maintenance personnel.

[0008] Design scheme: in order to realize the above design purpose.

[0009] 1、Step one: after the opening of the antenna synchronous debugging of the acousto-magnetic electronic article surveillance detection equipment, the digital signal processor in the acousto-magnetic electronic article surveillance detection equipment obtains the periodically occurring antenna signal collection starting point by processing the square wave signal of the mains frequency, and then the acousto-magnetic electronic article surveillance detection equipment commands the acousto-magnetic antenna to open; Step two: after the acousto-magnetic antenna is opened, the received signal is uploaded to the digital signal processor in real time, the digital signal processor can collect and store the data belonging to the collection period, and the digital signal processor can collect and store the data of multiple collection periods, and the collection period starts with the corresponding antenna signal collection starting point; Step three: after the data collection of multiple collection periods is completed, the digital signal processor processes the data in each collection period into an array, then the digital signal processor compares the values at the same position in multiple arrays and retains the value with the largest value, forms a new array, and then the digital signal processor draws multiple phase antenna transmission and reception window graphics through the data of the new array; Step four: the digital signal processor compares and identifies the multiple phase antenna reception window graphics with the standard multiple phase antenna reception window graphics, when the digital signal processor identifies that the antenna reception window receives the pulse signal interfered by the acousto-magnetic antenna, the digital signal processor adjusts the signal transmission time point of the antenna, so that the acousto-magnetic antenna and the interfering acousto-magnetic antenna realize synchronous transmission, which is one of the technical features of the present application.The purpose of the design is: step one: after the acoustic magnetic electronic article surveillance detection equipment opens the antenna synchronous debugging, the digital signal processor in the acoustic magnetic electronic article surveillance detection equipment acquires the periodically appearing antenna signal acquisition starting point by processing the square wave signal of the mains frequency, and then the acoustic magnetic electronic article surveillance detection equipment commands the acoustic magnetic antenna to open; step two: after the acoustic magnetic antenna opens, the received signal is uploaded to the digital signal processor in real time, the digital signal processor can collect and store the data in the acquisition period, and the digital signal processor can collect and store the data of multiple acquisition periods, and the acquisition period starts with the corresponding antenna signal acquisition starting point; step three: after the data of multiple acquisition periods are collected, the digital signal processor processes the data in each acquisition period into an array, and then the digital signal processor compares the values at the same position in multiple arrays and retains the value with the largest value to form a new array, and then the digital signal processor draws multiple phase antenna transmission and reception window graphics through the data of the new array; step four: the digital signal processor compares and identifies the multiple phase antenna reception window graphics with the standard multiple phase antenna reception window graphics, when the digital signal processor identifies that the antenna reception window receives the pulse signal transmitted by the interference acoustic magnetic antenna, the digital signal processor adjusts the signal transmission time point of the antenna, so that the acoustic magnetic antenna and the interference acoustic magnetic antenna realize synchronous transmission, a phase synchronization debugging method applied to an acoustic magnetic electronic article surveillance detection equipment can quickly find the transmission and reception cycle frequency of the interference antenna through graphic comparison, and realize the synchronous transmission and reception of the acoustic magnetic antenna and the interference acoustic magnetic antenna according to the transmission and reception cycle frequency of the interference antenna through the synchronous phase parameters, which not only improves the efficiency of synchronous debugging, but also reduces the working intensity of the technical maintenance personnel; in addition, after the data of multiple acquisition periods are collected, the digital signal processor processes the data in each acquisition period into an array, and then the digital signal processor compares the values at the same position in multiple arrays and retains the value with the largest value to form a new array, which can more accurately find the interference antenna and the phase number of the interference antenna, thereby improving the one-time success rate of synchronous debugging.

[0010] 2、The process of obtaining the antenna signal acquisition starting point is as follows: first, the acoustic magnetic electronic merchandise anti-theft detection equipment converts the commercial alternating current into a low-voltage alternating signal through a step-down transformer, then the low-voltage alternating signal is converted into a square wave signal of the commercial frequency through the voltage comparator circuit unit in the acoustic magnetic electronic merchandise anti-theft detection equipment, then the square wave signal of the commercial frequency is input to the digital signal processor in the acoustic magnetic electronic merchandise anti-theft detection equipment for processing, the digital signal processor calculates the interval time of the two collected rising edges or falling edges after collecting two adjacent rising edges or falling edges in the square wave signal, then the digital signal processor converts the interval time into a time frequency and matches the time frequency with the commercial frequency, when the two are successfully matched, the rising edge or falling edge of the square wave signal is set as the antenna signal acquisition starting point, which is the second technical feature of the present application. The purpose of such design is as follows: the process of obtaining the antenna signal acquisition starting point is as follows: first, the acoustic magnetic electronic merchandise anti-theft detection equipment converts the commercial alternating current into a low-voltage alternating signal through a step-down transformer, then the low-voltage alternating signal is converted into a square wave signal of the commercial frequency through the voltage comparator circuit unit in the acoustic magnetic electronic merchandise anti-theft detection equipment, then the square wave signal of the commercial frequency is input to the digital signal processor in the acoustic magnetic electronic merchandise anti-theft detection equipment for processing, the digital signal processor calculates the interval time of the two collected rising edges or falling edges after collecting two adjacent rising edges or falling edges in the square wave signal, then the digital signal processor converts the interval time into a time frequency and matches the time frequency with the commercial frequency, when the two are successfully matched, the rising edge or falling edge of the square wave signal is set as the antenna signal acquisition starting point; in this way, the antenna signal acquisition starting point can be quickly and accurately found, thereby further improving the one-time success rate of synchronous debugging.

[0011] 3. When the digital signal processor acquires the rising edge or falling edge of the previous square wave signal, the digital signal processor records the current time as T1, when the digital signal processor acquires the rising edge or falling edge of the previous square wave signal, the digital signal processor records the current time as T2, then the digital signal processor obtains the time difference T between the two adjacent rising edges or the two adjacent falling edges by T2 minus T1, then the digital signal processor obtains the time frequency by calculating the reciprocal of T, when the time frequency is equal to the power frequency corresponding to the square wave signal, then the digital signal processor acquires the rising edge or falling edge of the current square wave signal as the starting point of the antenna signal acquisition design, which is the third technical feature of the present application. The purpose of this design is: when the digital signal processor acquires the rising edge or falling edge of the previous square wave signal, the digital signal processor records the current time as T1, when the digital signal processor acquires the rising edge or falling edge of the previous square wave signal, the digital signal processor records the current time as T2, then the digital signal processor obtains the time difference T between the two adjacent rising edges or the two adjacent falling edges by T2 minus T1, then the digital signal processor obtains the time frequency by calculating the reciprocal of T, when the time frequency is equal to the power frequency corresponding to the square wave signal, then the digital signal processor acquires the rising edge or falling edge of the current square wave signal as the starting point of the antenna signal acquisition, which can reduce the calculation amount of the digital signal processor, thereby not only can further improve the efficiency of the antenna signal acquisition starting point determination, but also can reduce the performance requirement of the digital signal processor.

[0012] 4. When the multiple phase antenna receiving window pattern is compared with the standard multiple phase antenna receiving window pattern, if the amplitude of one phase antenna receiving window pattern in the multiple phase antenna receiving window pattern is greater than the standard amplitude of the corresponding standard phase antenna receiving window pattern in the standard multiple phase antenna receiving window pattern by a set value, it is determined that the phase antenna receiving window receives the pulse signal transmitted by the interfering acoustic magnetic antenna, which is the fourth technical feature of the present application. The purpose of this design is that when the multiple phase antenna receiving window pattern is compared with the standard multiple phase antenna receiving window pattern, if the amplitude of one phase antenna receiving window pattern in the multiple phase antenna receiving window pattern is greater than the standard amplitude of the corresponding standard phase antenna receiving window pattern in the standard multiple phase antenna receiving window pattern by a set value, it is determined that the phase antenna receiving window receives the pulse signal transmitted by the interfering acoustic magnetic antenna. Through comprehensive and synchronous comparison of the multi-phase pattern, the phase data of the interfering antenna can be identified more quickly and better. In addition, another advantage of multi-phase pattern comparison is intuitive. When the compared patterns are displayed on the interface (the patterns and standard patterns are displayed on the interface through data plotting), maintenance personnel can more intuitively observe the comparison data with their naked eyes and manually adjust the set value (for example, the interfering antenna is predicted to exist, but there is no phase data of the interfering antenna displayed. At this time, maintenance personnel can observe the comparison data with their naked eyes. If the amplitude of one phase antenna receiving window pattern is indeed higher than that of the corresponding standard phase antenna receiving window pattern (compared with the corresponding standard pattern), maintenance personnel can manually input the appropriate set value according to the need to realize manual adjustment of the set value). In this way, the digital signal processor can obtain the phase data of the interfering antenna. In addition, since the obtained phase data of the interfering antenna can be displayed on the interface, when the acoustic magnetic antenna in the same interfering area does not need to be adjusted again, it can be directly matched according to the data obtained from the first phase synchronous adjustment. In this way, batch adjustment saves time and effort.

[0013] 5. When the digital signal processor identifies that the antenna receiving window receives the pulse signal transmitted by the interference acoustic magnetic antenna and the digital signal processor determines the antenna receiving window, the digital signal processor moves the pulse signal transmitted by the interference acoustic magnetic antenna out of the antenna receiving window and into the antenna transmitting window by moving the synchronization phase value, so as to realize the design of synchronous transmission and synchronous reception of the acoustic magnetic antenna and the interference acoustic magnetic antenna, which is the fifth technical feature of the present application. The purpose of the design is that when the digital signal processor identifies that the antenna receiving window receives the pulse signal transmitted by the interference acoustic magnetic antenna and the digital signal processor determines the antenna receiving window, the digital signal processor moves the pulse signal transmitted by the interference acoustic magnetic antenna out of the antenna receiving window and into the antenna transmitting window by moving the synchronization phase value, so as to realize the design of synchronous transmission and synchronous reception of the acoustic magnetic antenna and the interference acoustic magnetic antenna, which is convenient and less prone to errors.

[0014] 6. Before the antenna synchronization debugging of the acousto-magnetic electronic article surveillance detection equipment is started, the acousto-magnetic electronic article surveillance detection equipment is started to detect the environmental noise by the acousto-magnetic antenna, at this time the acousto-magnetic antenna is in the signal receiving state and does not emit electromagnetic wave signals outwardly, the digital signal processor calculates the environmental noise signals received by the acousto-magnetic antenna and calculates the environmental noise value, when the detected environmental noise value is greater than or equal to the set value, the antenna synchronization debugging is started; when the detected environmental noise value is less than the set value, the acousto-magnetic antenna emits electromagnetic wave signals outwardly in the signal receiving state, the electromagnetic wave signals emitted by the acousto-magnetic antenna will stimulate the tag signals in the environment, when the signals received by the acousto-magnetic antenna are greater than the tag signals and the difference between the two is greater than or equal to the set value one, the antenna synchronization debugging is started, which is the sixth technical feature of the application. The purpose of this design is that before the antenna synchronization debugging of the acousto-magnetic electronic article surveillance detection equipment is started, the acousto-magnetic electronic article surveillance detection equipment is started to detect the environmental noise by the acousto-magnetic antenna, at this time the acousto-magnetic antenna is in the signal receiving state and does not emit electromagnetic wave signals outwardly, the digital signal processor calculates the environmental noise signals received by the acousto-magnetic antenna and calculates the environmental noise value, when the detected environmental noise value is greater than or equal to the set value, the antenna synchronization debugging is started; when the detected environmental noise value is less than the set value, the acousto-magnetic antenna emits electromagnetic wave signals outwardly in the signal receiving state, the electromagnetic wave signals emitted by the acousto-magnetic antenna will stimulate the tag signals in the environment, when the signals received by the acousto-magnetic antenna are greater than the tag signals and the difference between the two is greater than or equal to the set value one, the antenna synchronization debugging is started, through the judgment of the environmental noise and the judgment of the tag signals, the judgment of the two progressive relationships can quickly and accurately make a preliminary judgment (judge whether there is an interference source of the acousto-magnetic antenna, the acousto-magnetic antenna will appear false alarm when encountering interference, and the acousto-magnetic antenna may also appear false alarm when encountering failure), which can not only improve the identification efficiency of the interference source, but also relatively low requirement for the working experience of the maintenance personnel; through actual test and use, the maintenance personnel takes no more than 3 minutes from the judgment of the interference source to the adjustment of the antenna emission frequency of the company to be synchronized with the antenna of the interference source.

[0015] Technical solution: A phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection equipment, comprising the following steps: step one: after the acousto-magnetic electronic merchandise anti-theft detection equipment opens the antenna synchronization debugging, the digital signal processor in the acousto-magnetic electronic merchandise anti-theft detection equipment acquires the periodically occurring antenna signal acquisition starting point by processing the square wave signal of the mains frequency, and then the acousto-magnetic electronic merchandise anti-theft detection equipment commands the acousto-magnetic antenna to open; step two: after the acousto-magnetic antenna is opened, the received signal is uploaded to the digital signal processor in real time, the digital signal processor can collect and store the data in the acquisition period, and the digital signal processor can collect and store the data of multiple acquisition periods, and the acquisition period starts with the corresponding antenna signal acquisition starting point; step three: after the data of multiple acquisition periods are collected, the digital signal processor processes the data in each acquisition period into an array, then the digital signal processor compares the values at the same position in multiple arrays and retains the maximum value, forming a new array, and then the digital signal processor draws multiple phase antenna transmission and reception window graphics through the data of the new array; step four: the digital signal processor compares and identifies the multiple phase antenna reception window graphics with the standard multiple phase antenna reception window graphics, and when the digital signal processor identifies that the antenna reception window receives the pulse signal interfered by the acousto-magnetic antenna, the digital signal processor adjusts the signal transmission time point of the antenna, so that the acousto-magnetic antenna and the interfering acousto-magnetic antenna realize synchronous transmission.

[0016] Compared with the background art, the phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection equipment can not only realize rapid adjustment of the antenna synchronization phase parameters, but also can realize batch adjustment of all home acousto-magnetic antennas in the same interference area through one phase synchronization debugging, which saves time and effort and reduces the working intensity of technical maintenance personnel; the phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection equipment can not only improve the identification efficiency of the interference source (the total time of one phase synchronization debugging is not more than 3 minutes), but also has relatively low requirements for the working experience of maintenance personnel. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a flowchart of the phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection equipment.

[0018] Figure 2 It is a flowchart of the antenna starting point signal acquisition in the phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection equipment.

[0019] Figure 3 It is a flowchart of the antenna synchronization phase adjustment in the phase synchronization debugging method applied to acousto-magnetic electronic merchandise anti-theft detection equipment.

[0020] Figure 4 is a waveform diagram of mains zero-crossing synchronization detection. DETAILED DESCRIPTION

[0021] Embodiment 1: refer to the attached Figures 1-3 A phase synchronization debugging method applied to an acoustic magnetic electronic article surveillance detection device, comprising the following steps: step one: after the acoustic magnetic electronic article surveillance detection device opens the antenna synchronization debugging, the digital signal processor in the acoustic magnetic electronic article surveillance detection device acquires the periodically appearing antenna signal acquisition starting point by processing the square wave signal of the mains frequency, and then the acoustic magnetic electronic article surveillance detection device commands the acoustic magnetic antenna to open; step two: after the acoustic magnetic antenna is opened, the received signal is uploaded to the digital signal processor in real time, the digital signal processor can collect and store the data of the information belonging to the acquisition period, and the digital signal processor can collect and store the data of multiple acquisition periods, and the acquisition period starts with the corresponding antenna signal acquisition starting point; step three: after the data collection of multiple acquisition periods is completed, the digital signal processor processes the data in each acquisition period into an array, then the digital signal processor compares the values (data size) at the same position in multiple arrays and retains the value with the largest value, forms a new array, and then the digital signal processor draws multiple phase antenna transmission and reception window graphics through the data of the new array; step four: the digital signal processor compares and identifies the multiple phase antenna reception window graphics with the standard multiple phase antenna reception window graphics, when the digital signal processor identifies that the antenna reception window receives the pulse signal interfered by the acoustic magnetic antenna, the digital signal processor adjusts the signal transmission time point of the antenna, so that the acoustic magnetic antenna and the interfering acoustic magnetic antenna realize synchronous transmission.

[0022] The AC power signal is converted into a low-voltage AC signal through a transformer, and the low-voltage AC signal is converted into a square wave signal of the power frequency through a voltage comparator circuit; the square wave signal is input into a digital signal processor (DSP), the digital signal processor collects the rising edge or falling edge of the square wave signal, calculates the time of collecting the rising edge or falling edge twice, and determines whether the time frequency meets the power frequency; after the time frequency meets the power frequency, the rising edge (or falling edge) of the square wave signal is set as the starting point of the antenna operation; based on the starting point, the digital signal processor calculates the transmission window and the receiving window of the antenna (i.e., the acoustic-magnetic antenna), the antenna starts to transmit an electromagnetic wave pulse signal in the corresponding transmission window, and receives a feedback tag signal or an environmental noise signal in the receiving window; after the antenna transmits the electromagnetic wave, receives the tag signal, and calculates the tag signal, one working cycle is completed; in the next working cycle, the rising edge (or falling edge) of the square wave signal is collected, the starting point is set, the electromagnetic wave is transmitted again, the tag signal is received, and the tag signal is calculated, and the cycle is repeated.

[0023] When the antenna receives the synchronization debugging command, the antenna waits for the rising edge starting point of the square wave signal; when the antenna collects the starting point, the digital signal processor is switched to the set collection mode, and N points of data are continuously collected at a fixed collection frequency until the next rising edge starting point appears, which ends one collection cycle, and X cycles of data are collected in total; the N points of data of each X cycle of collected X cycle data are compared, the maximum N point data are saved, and the N point data are transmitted to the synchronization debugging software through the communication port of the antenna. The synchronization debugging software has the transmission window and the receiving window of the antenna in normal operation, the N data are displayed in the synchronization debugging software, and whether the transmission pulse signal of the antenna of another brand falls in the receiving window of the software can be identified on the display interface; if the transmission pulse signal of the antenna of another brand falls in the receiving window of the software, the transmission window of the antenna is moved to the transmission pulse of the antenna of another brand by moving the synchronization phase value in the software, so that the two transmission windows coincide, and the two antennas of different brands are set to synchronize transmission and synchronization reception, and do not interfere with each other.

[0024] The power supply of the antenna is provided by 220V or 110V AC power supply, and the acoustic-magnetic antenna not only needs to be provided with power supply by the AC power supply, but also needs to obtain the zero point of the AC power supply as the synchronization reference point of the antenna; the AC power supply is converted into a low-voltage AC power supply through a step-down transformer, and the low-voltage AC power supply is rectified and filtered to supply power to the antenna mainboard; the low-voltage AC power supply obtains the zero point of the AC power supply through a voltage comparator circuit unit. The 50Hz or 60Hz AC sine wave signal is converted into a 50Hz or 60Hz square wave signal through the comparator circuit.

[0025] The process of obtaining the antenna signal acquisition starting point is as follows: first, the acousto-magnetic electronic article surveillance detection equipment converts the commercial ac power into low-voltage ac signal through the step-down transformer, then the low-voltage ac signal is converted into a square wave signal of the commercial frequency through the voltage comparator circuit unit in the acousto-magnetic electronic article surveillance detection equipment, then the square wave signal of the commercial frequency is input to the digital signal processor in the acousto-magnetic electronic article surveillance detection equipment for processing, the digital signal processor calculates the interval time of the two rising edges or the two falling edges collected twice after collecting the adjacent two rising edges or two falling edges in the square wave signal, then the digital signal processor converts the interval time into a time frequency and matches the time frequency with the commercial frequency, when the two are matched successfully, the rising edge or the falling edge of the square wave signal is set as the antenna signal acquisition starting point (i.e. the starting point of the antenna operation).

[0026] When the digital signal processor obtains the rising edge or the falling edge of the previous square wave signal, the digital signal processor records the current time as T1, when the digital signal processor obtains the rising edge or the falling edge of the square wave signal after the previous one, the current time is recorded as T2, then the digital signal processor obtains the time difference T between the adjacent two rising edges or the adjacent two falling edges by subtracting T1 from T2, then the digital signal processor obtains the time frequency by calculating the reciprocal of T, when the time frequency is equal to the commercial frequency corresponding to the square wave signal, then the digital signal processor obtains the rising edge or the falling edge of the current square wave signal as the antenna signal acquisition starting point. When the square wave signal is input to the digital signal processor DSP of the mainboard, the DSP chip detects the square wave signal in real time in the working operation, the DSP chip can be set to obtain the pulse change of the square wave signal in the rising edge or the falling edge, taking the rising edge as an example, when the DSP obtains the rising edge of the square wave signal, the current time is recorded as T1, when the DSP obtains the rising edge of the square wave signal again, the current time is recorded as T2, the frequency and the time T=T2-T1 of the square wave signal can be calculated, T equal to 20ms satisfies the commercial frequency of 50HZ, T equal to 16.67us satisfies the commercial frequency of 60HZ. When the calculated time T satisfies the time error of 50HZ or 60HZ, it means that the collected square wave signal satisfies the commercial frequency, the rising edge of the square wave signal can be set as the zero point of the ac commercial power, and this time point is the starting point of the antenna operation.

[0027] The digital signal processor can continuously collect data of multiple points at a fixed collection frequency in a collection cycle, and the collection cycle is from the beginning of the appearance of the last antenna signal collection starting point to the end of the appearance of the next antenna signal collection starting point. When comparing and identifying the multiple-phase antenna receiving window pattern with the standard multiple-phase antenna receiving window pattern, if the difference between the amplitude of one of the multiple-phase antenna receiving window patterns and the standard amplitude of the corresponding standard antenna receiving window pattern in the standard multiple-phase antenna receiving window pattern is greater than a set value, it is determined that the antenna receiving window of the phase receives the pulse signal transmitted by the interfering acoustic magnetic antenna. When the digital signal processor identifies that the antenna receiving window receives the pulse signal transmitted by the interfering acoustic magnetic antenna and the digital signal processor determines the antenna receiving window, the digital signal processor moves the transmission pulse signal of the interfering acoustic magnetic antenna out of the antenna receiving window and into the antenna transmission window by moving the synchronization phase value, thereby realizing the synchronous transmission and reception of the acoustic magnetic antenna and the interfering acoustic magnetic antenna. The synchronization phase value is stored in the EEPROM, and the acoustic magnetic antenna starts working from the working starting zero point plus the synchronization phase shift value each time it starts working. When the digital signal processor draws a pattern by using the data of the new array, the pattern of each antenna working phase includes the antenna transmission window pattern, the delay window pattern between the antenna transmission and the antenna reception, and the antenna receiving window pattern; when comparing the patterns, the digital signal processor compares the antenna receiving window pattern on different antenna working phases with the corresponding standard antenna receiving window pattern.

[0028] Further explanation of the starting point, after the starting point is determined, the starting point is the zero point of the antenna work, the antenna starts to transmit electromagnetic wave pulse at the zero point, and the transmission time t1; after transmission, the delay time between transmission and reception is t2; the starting time of reception can be calculated as tv=t1+t2, and the antenna reception time is t3. This is the working time of one phase of the antenna, and the acoustic magnetic antenna works in three phases, which are referred to as A phase, B phase and C phase. Taking 50HZ power supply as an example, the starting point of A phase work is the zero point collected, and the A phase work time is Ta=0+t1+t2+t3; the B phase work time is Tb=6.67ms+t1+t2+t3; the C phase work time is Tc=13.3ms+t1+t2+t3; after the phases A, B and C work, the antenna works for one cycle, and waits for the rising edge (or falling edge) of the next square wave signal as the working starting point, and then starts A phase work, B phase work and C phase work, and the cycle is repeated.

[0029] When the antenna is interfered by asynchronous interference (i.e. the antenna is interfered by the asynchronous interference of the acoustic magnetic antenna of the nearby store in the working environment, so that the antenna cannot work normally), the antenna synchronization debugging command can be started. After the antenna receives the synchronization debugging command, it enters the synchronization debugging state and runs. First, the digital signal processor obtains the rising edge signal of the square wave as the starting zero point of work. Then the antenna starts to collect the antenna receiving signal and collect the antenna transmitting pulse signal of the nearby store. The signal of X cycles and N points in each cycle is collected. For example, 6 cycles, 1000 points in each cycle, the collection time of one cycle is 20ms, the total collection time is 120ms, 1000 points in each cycle are collected, and the collection time of each point is 20us. Just after the collection is completed, the rising edge of the next cycle arrives and the collection of 1000 points in the second cycle is continued. The data collection is completed and the data processing is performed.

[0030] Further, the data of 6 cycles and 1000 points in each cycle can define six Tab

[1000] arrays, respectively Tab1

[1000] —Tab6

[1000] , wherein Tab[0] is the first point and the data size is the value of the value. Tab

[999] is the 1000th point. After the data of 6 cycles and 1000 points in each cycle is collected, the digital signal processor takes the maximum value data in each 6 groups of 6 cycles. The maximum value data in Tab1[1], Tab2[1], Tab3[1], Tab4[1], Tab5[1], and Tab6[1] is saved in the Tab[1] array. The maximum value in the 6 groups is obtained to obtain a new Tab array of 1000 points. Then the 1000 point data of the Tab array is transmitted to the debugging software through the communication port of the antenna. The debugging software parses the transmitted 1000 data. The X axis of the software is time 20ms, and the X axis is also divided into 1000 points, which corresponds to 1000 data points. The Y axis is the value corresponding to 1000 points. Then the software connects the 1000 data by drawing method to form a line segment of 1000 points.

[0031] Further, according to the antenna working phase and time, a standard antenna three working phase ABC emission and receiving window time chart is set on the software display interface, wherein the A phase takes the 0 point of the X axis as the starting point, Ta=0+t1+t2+t3, the B phase Tb=6.67ms+t1+t2+t3, and the C phase Tc=13.3ms+t1+t2+t3. Taking t1=1.8ms, t2=0.6ms, and t3=2ms as an example, t1 needs to occupy 90 points, t2 needs to occupy 30 points, and t3 needs to occupy 100 points; the A phase emission and receiving window is drawn as a 0-89 point emission window, a 90-119 point emission and receiving intermediate delay window, and a 120-219 point receiving window; the B phase emission and receiving window is drawn as a 333-422 point emission window, a 423-452 point emission and receiving intermediate delay window, and a 453-552 point receiving window; and the C phase emission and receiving window is drawn as a 666-755 point emission window, a 756-785 point emission and receiving intermediate delay window, and a 786-885 point receiving window.

[0032] Further, the 1000 data signals collected are displayed on the software chart and compared with the standard ABC three phase receiving window chart, to compare whether there is a high amplitude pulse signal in the receiving window. If there is a high amplitude pulse in the receiving window of the antenna, which is the nearby antenna emission pulse signal, the pulse signal is actually in the receiving window of the antenna and seriously affects the working performance of the antenna. The maintenance personnel moves the synchronous phase value to move the nearby antenna emission pulse signal out of the receiving window and to the emission window of the antenna, and aligns the emission pulse signal with the emission frame on the emission window, so that the antenna and the antenna can work cooperatively, simultaneously emit and simultaneously receive.

[0033] Further, after moving the synchronous phase value to move the nearby antenna emission pulse signal out of the receiving window of the antenna, the working starting point of the antenna is the zero point plus the moved synchronous phase value (the rising edge starting point of the original square wave signal is taken as the zero point); for example, the synchronous phase value is 200, a total of 6.67ms can be moved, the value is 667, each data corresponds to 10us, and moving 200 is moving 2ms. The A phase working time of the current antenna is Ta=2ms+t1+t2+t3, the B phase working time is Tb=8.67ms+t1+t2+t3, and the C phase working time is Tc=15.3ms+t1+t2+t3. The synchronous phase value is reported in the EEPROM, and the antenna power failure will not be lost.

[0034] Before the antenna of the acousto-magnetic electronic article surveillance detection device is started for synchronous debugging, the acousto-magnetic electronic article surveillance detection device detects the environmental noise with the acousto-magnetic antenna being in a signal receiving state and not emitting electromagnetic wave signals. The digital signal processor calculates the environmental noise signals received by the acousto-magnetic antenna and calculates the environmental noise value. When the detected environmental noise value is greater than or equal to a set value, the antenna synchronous debugging is started.

[0035] When the detected environmental noise value is less than the set value, the acousto-magnetic antenna in the signal receiving state emits electromagnetic wave signals. The electromagnetic wave signals emitted by the acousto-magnetic antenna will excite the tag signals in the environment. When the signals received by the acousto-magnetic antenna are greater than the tag signals and the difference between the two is greater than or equal to a set value, the antenna synchronous debugging is started.

[0036] An example process of a phase synchronous debugging method applied to an acousto-magnetic electronic article surveillance detection device. After the device starts to work, the system initializes to read various parameters of the device work. The device starts to run the power zero detection. The converted square wave signal is detected. It is determined whether the frequency of the square wave signal meets 50HZ or 60HZ. The rising edge or falling edge of the square wave signal is used as the starting point of the antenna's own work synchronization. The antenna does not emit electromagnetic wave signals at this starting point. There will be no tag signals excited in the environment. At this time, the antenna receives the environmental noise value for calculating the antenna itself. If the antenna receives the environmental noise value at this time, the detected environmental noise value is huge (reaches the environmental noise set value). The device will prompt the user through the noise environment indicator light or other ways. The device is seriously disturbed. It may be that there is no synchronous antenna interference in the nearby store (i.e. there is an interference source). If the environmental noise value is not large, the antenna continues to run and emits electromagnetic wave signals to excite the tag signals in the environment. If there are tag signals in the signals received by the antenna at this time, the antenna will enter the alarm processing logic if the received signals meet the alarm antenna set by the antenna. The antenna will also determine that there is an out-of-sync antenna interference (i.e. there is an interference source) which causes the antenna to fail to detect normally. The device will also prompt the user through the noise environment indicator light or other ways. The device is seriously disturbed.

[0037] After the user gets the device debugging instruction, the user can start the synchronous debugging command and enter the synchronous phase debugging program through a remote network or on-site debugging. The antenna starts to obtain a working starting point. After the starting point is obtained, the antenna starts to collect antenna receiving coil signals. The antenna needs to collect X cycles, and X can be set to 1-10. N points of data are collected in each cycle, and N can be set to 500-2000. After X cycle data collection is completed, data processing is performed, the maximum point number in the X cycles is taken out, and the data is transmitted to a display interface for display. Then, the display interface connects N points of data to draw a line segment according to the transmitted data. The drawn line segment is compared with a standard pattern to determine whether there is a pulse signal with a high amplitude in the receiving window. If there is a pulse signal with a high amplitude in the receiving window of the antenna, the pulse signal is the transmission pulse signal of a nearby antenna. The pulse signal actually falls on the receiving window of the antenna, which seriously affects the working performance of the antenna. Then, the graph displayed through the software interface is used to move the transmission pulse signal out of the receiving window and to the transmission window of the antenna to align with the transmission frame on the transmission window. In this way, the antenna and the antenna can be set to work cooperatively, that is, to transmit and receive at the same time. The synchronous phase value is saved on the system, and the system does not lose the value after power failure. The antenna works from the working starting zero point plus the synchronous phase value each time.

[0038] It should be understood that, although the above embodiments have been described in detail, these descriptions are only simple descriptions of the design ideas of the present application, and not limitations of the design ideas of the present application. Any combination, addition or modification that does not exceed the design ideas of the present application falls within the protection scope of the present application.

Claims

1. A phase synchronization debugging method for an acousto-magnetic electronic goods anti-theft detection device, characterized in that: The process includes the following steps: Step 1: After the acousto-magnetic electronic goods anti-theft detection device activates its antenna synchronization debugging, the digital signal processor in the device processes the square wave signal at the mains frequency to obtain the periodically occurring antenna signal acquisition start point. Then, the device commands the acousto-magnetic antenna to activate. Step 2: After the acousto-magnetic antenna is activated, it uploads the received signal to the digital signal processor in real time. The digital signal processor can acquire and store data within the acquisition cycle, and it can acquire and store data from multiple acquisition cycles, each starting from the corresponding antenna signal acquisition start point. Step 3: During the data acquisition of multiple acquisition cycles... After the data collection is completed, the digital signal processor (DSP) processes the data from each acquisition cycle into an array. Then, the DSP compares the values ​​at the same position in multiple arrays and retains the largest value, forming a new array. The DSP then uses the data in the new array to draw antenna transmit and receive window patterns for multiple phases. Step four: The DSP compares and identifies the antenna receive window patterns for multiple phases with standard antenna receive window patterns for multiple phases. When the DSP identifies that an antenna receive window has received a pulse signal from the interfering acousto-magnetic antenna, the DSP adjusts the signal transmission time of the antenna to achieve synchronous transmission between the acousto-magnetic antenna and the interfering acousto-magnetic antenna.

2. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 1, characterized in that: The process of obtaining the antenna signal acquisition starting point is as follows: First, the acoustomagnetic electronic product anti-theft detection device converts the AC mains power into a low-voltage AC signal through a step-down transformer. Then, the low-voltage AC signal is converted into a square wave signal at the AC mains frequency by the voltage comparator circuit unit in the acoustomagnetic electronic product anti-theft detection device. The square wave signal at the AC mains frequency is then input to the digital signal processor in the acoustomagnetic electronic product anti-theft detection device for processing. After acquiring two adjacent rising edges or two falling edges in the square wave signal, the digital signal processor calculates the time interval between the two acquired rising edges or falling edges. Then, the digital signal processor converts the time interval into a time frequency and matches the time frequency with the AC mains frequency. When the two are successfully matched, the rising edge or falling edge of the square wave signal is set as the antenna signal acquisition starting point.

3. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 2, characterized in that: When the digital signal processor (DSP) acquires the rising or falling edge of the previous square wave signal, it records the current time as T1. When the DSP acquires the rising or falling edge of the next square wave signal, it records the current time as T2. Then, the DSP obtains the time difference T between two adjacent rising edges or two adjacent falling edges by subtracting T1 from T2. The DSP then calculates the reciprocal of T to obtain the time frequency. When the time frequency is equal to the mains frequency corresponding to the square wave signal, the DSP acquires the rising or falling edge of the current square wave signal as the starting point for antenna signal acquisition.

4. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 1 or 2, characterized in that: The digital signal processor can continuously acquire data from multiple points at a fixed acquisition frequency during the acquisition cycle, which is from the occurrence of the previous antenna signal acquisition start point to the occurrence of the next antenna signal acquisition start point.

5. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 1, characterized in that: When comparing and identifying antenna receiving window patterns of multiple phases with standard antenna receiving window patterns of multiple phases, if the difference between the amplitude of the antenna receiving window pattern of a certain phase in the multiple phase antenna receiving window pattern and the standard amplitude of the corresponding standard phase antenna receiving window pattern in the standard multiple phase antenna receiving window pattern is greater than a set value, it is determined that the antenna receiving window of that phase has received a pulse signal that interferes with the transmission of the acoustomagnetic antenna.

6. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 1 or 5, characterized in that: When the digital signal processor (DSP) identifies that an antenna receiving window has received a pulse signal transmitted by an interfering acousto-magnetic antenna and determines the antenna receiving window, the DSP moves the transmitted pulse signal of the interfering acousto-magnetic antenna out of the antenna receiving window and into the antenna transmitting window by shifting the synchronization phase value, thereby achieving synchronous transmission and reception between the main acousto-magnetic antenna and the interfering acousto-magnetic antenna.

7. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 6, characterized in that: The synchronization phase value is stored in EEPROM. Each time the acousto-magnetic antenna starts working, it starts working from the zero point of operation plus this synchronization phase shift value.

8. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 1, characterized in that: When the digital signal processor draws a graph using the data from the new array, the graph for each antenna operating phase includes the antenna transmit window graph, the delay window graph between antenna transmit and antenna receive, and the antenna receive window graph. When performing graph comparison, the digital signal processor retrieves the antenna receive window graphs for different antenna operating phases and compares them with the corresponding standard antenna receive window graphs.

9. The phase synchronization debugging method for acousto-magnetic electronic goods anti-theft detection equipment according to claim 1, characterized in that: Before the synchronous debugging of the antenna of the acoustomagnetic electronic goods anti-theft detection equipment is turned on, the acoustomagnetic antenna of the acoustomagnetic electronic goods anti-theft detection equipment is turned on to detect the ambient noise. At this time, the acoustomagnetic antenna is in the signal receiving state and does not emit electromagnetic wave signals. The digital signal processor calculates the ambient noise signal received by the acoustomagnetic antenna and calculates the ambient noise value. When the detected ambient noise value is greater than or equal to the set value, the antenna synchronous debugging is turned on.

10. The phase synchronization debugging method for an acousto-magnetic electronic goods anti-theft detection device according to claim 1, characterized in that: When the detected ambient noise value is less than the set value, the acousto-magnetic antenna is in signal receiving mode and emits electromagnetic wave signals. The electromagnetic wave signals emitted by the acousto-magnetic antenna will excite the tag signal in the environment. When the signal received by the acousto-magnetic antenna is greater than the tag signal and the difference between the two is greater than or equal to the set value, the antenna synchronization adjustment is activated.

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