Magnetic thread reader

FIELD: magnetic thread recognition means.

SUBSTANCE: method provides for relative movement between thread and matrix of magnetic heads; each head generates a signal in case of detection of a portion of thread. Approach of thread to one of heads is detected, while this head is marked as main head, and heads on each side of the latter - as secondary heads. Output signals from main and secondary heads are controlled for forming of an image of thread signals amplitudes from main and secondary heads are compared, so that if amplitude of output signal from secondary head exceeds amplitude of signal from main head, then secondary and primary heads are appropriately reassigned.

EFFECT: higher speed of operation, higher efficiency.

6 cl, 17 dwg

 

The present invention relates to a method and apparatus for detecting security threads, for example, to identify a document of the security code formed by this thread.

It is well known that the protected documents, such as banknotes supplied with a protective thread. This may be a simple metallic yarn or thread containing the segments of magnetic material and nonmagnetic segments of material.

You can sort the segments of magnetic and non-magnetic material so that they were code. In a typical case, the segments are ordered in the elements of fixed length so that they are represented by a binary word, and this word can be repeated several times along the thread. For example, elements of fixed length can have a length of 2 mm, and the presence of a magnetic material indicates a binary "1"and its absence indicates a binary "0".

This code can be read using a magnetic head or sensor heads. This typically can be done by temporarily magnetizing the magnetic material forming the thread, and provide for documents that must be carried by the transport mechanism, so that they pass near the matrix of magnetic heads and magnetic filament material is in close proximity to the heads.

When a code is read, which you can identify the document, carrying the thread, by comparing the code with a database of known codes.

In the document GB 2098768 disclosed In the reader coded magnetic thread in which linear matrix magnetic heads scans the security thread embedded in the document, and stores the sampling signals generated by the magnetic heads, in memory devices, which are sequentially scanned and compared with a fixed threshold for the formation of a binary bit stream corresponding to the change of magnetization along the thread.

Although GB 2098768 In the disclosed device, which allows you to read the thread, presents at an acute angle to the matrix of magnetic heads used method requires very time-consuming processing, because the signals generated by the heads, continuously scanned in sequence for forming a time varying output signal.

In EP 0493438 described device for reading the code contained in the filament, and the signal generated by the magnetic head, is digitized by comparing it with two thresholds. The level of these two thresholds may be increased in accordance with the amplitude of the deflection signal, so that the perception thresholds are crossed substantially stable with respect to changes in signal amplitude.

In accordance with the first aspect of the present izopet the tion, provides a method for detection of magnetic filaments, comprising providing relative movement between the filament and the matrix of magnetic heads, each of which generates a signal upon detection thread; detecting approach of the thread to one of the heads, and the designation of her as the main head, and the head on each side of it - as a secondary head; control then the output signals from the primary and secondary heads for forming the submission thread, and comparing the amplitudes of signals from the primary and secondary heads, so that if the amplitude of the output signal from the secondary heads exceeds a corresponding amplitude with the main head, the main and secondary heads respectively redistributed.

Therefore, the invention provides a method for allowing a correct way to read the thread that presents at an acute angle to the linear matrix heads. By monitoring the output signals from only those heads in the matrix heads, which are in close proximity to the filament, this method uses the minimum processing time.

Preferably, the magnetic thread is a coded magnetic thread. However, it is possible that the thread did not contain the code, and consisted of a magnetic material of continuous length.

Usually, the code contained in the coded the th magnetic filaments, reproduced by combining the output signals from all of the heads that were primary or secondary, using a logical "OR".

In a typical case, the peak values of the output signals of the primary and secondary heads will be used to determine whether the output signal of the secondary heads corresponding output signal of the main head. However, an alternative way is to use the speed of rotation of the output signals of the primary and secondary heads to determine which of them anymore.

Magnetic thread can be in sheet or document on it, and in this case, the sheet document in a typical case is a banknote. Alternatively, the method can be applied to a magnetic filament before it is embedded in the sheet document. If the matrix of magnetic heads is not linear, the signals generated by some of the magnetic heads may be shifted in time to align them with the signals generated by other magnetic heads.

If sheet paper is bill, the method may further comprise performing analysis over view of the thread to determine the denomination of the banknote.

In accordance with the second aspect of the present invention provides a device for the detection of m is Gnanou thread containing a matrix of magnetic heads, each of which is connected with the corresponding processor, which processes the signals generated by the respective magnetic head; and a processing system coupled to the processor, the processing system designed to perform the method, corresponding to the first aspect of the present invention.

Typically, the device also contains a system of transporting documents, designed for moving the document relative to the matrix of magnetic heads, and the transport system stops the document, if the processing system is unable to identify the document from the view of a thread.

Alternatively, if the processing system is unable to identify the document, then the document may be delivered to another location, which is installed by default.

The device can also be created in such a way as to perform the operation "alignment value to which the banknotes of mixed denominations is evaluated and, if necessary, sorted by different output members, respectively, to their face value.

Preferably, the matrix of magnetic heads comprises at least one permanent magnet. However, it is also possible to use a separate permanent magnet for magnetizing the magnetic material, which obrazu the thread.

The appearance of part of a magnetic filament can be determined by continuous scanning signals generated by the processor associated with the primary and secondary heads. Preferably, the processor generates an interrupt signal when the corresponding detector detects the appearance of a part of magnetic filaments, and the processing system supports the interrupt mask in accordance with the primary and secondary heads.

The matrix of magnetic heads can be linear lattice. Alternatively, the magnetic head can be ordered in such a way that they lie on one of the many parallel axes, each of which is offset from the others. In a typical configuration, some of the magnetic heads lie on the first axis and the other lying on the second axis, which is parallel to the first axis.

The matrix of magnetic heads may contain inductive or magnetoresistive magnetic head or a combination of such heads.

Another disadvantage of prior art devices associated with the read codes that include a sequence of binary units. In this case, a continuous length of magnetic material must be sufficiently long to allow the flux density was constant. Consequently, any signal generated by a magnetic head, and any associated with this wysokosc the frequency filtering will lead to fall to zero and again increase due to the change in flux density, when the end of the magnetic element approaches the head. It is possible that long magnetic element may be inaccurate recognized as two separate shorter magnetic element with a section of non-magnetic material between them.

In the U.S. patent And 5889271 described method of detecting coded thread with multiple readout channels for the detection of each segment of the thread, but this method is difficult to implement.

In accordance with a third aspect of the present invention provides a method for detecting coded magnetic thread, including the measurement of the detector response of the magnetic field, when the thread is moved past the detector, and the response varies from the initial amplitude in the first and second directions to detect the first peak and then in the first direction to detect a second peak; comparing the response with the first and second thresholds; and indication of the passage of the code element of the thread when the response passes the second threshold, then the first threshold is a predefined manner, wherein the first threshold is adjusted in accordance with the first predefined algorithm based on the amplitude of the first peak.

Accordingly, it is possible, using this method, the correct way to detect long magnetic element by defining the location is, I can pay tithing and second thresholds, respectively.

If the magnetic element is short, after the response showed a second peak and then changed in the first direction, it changes in a second direction to return to its original size, thereby showing the third peak.

However, if the magnetic element long after the response showed a second peak and then changed in the first direction, it changes in the second direction and then in the first direction for the manifestation of the third peak and then modified in the second direction to return to its original amplitude, showing the fourth peak.

In a typical case, the first direction is a negative direction and the second direction is a positive direction. In this case, the magnitude of the first threshold is lower than the initial amplitude response and the magnitude of the second threshold is higher than the initial amplitude of the response.

However, the reverse is also possible, when the first direction is the positive direction and the second direction is a negative direction. Accordingly, the magnitude of the first threshold is higher than the initial amplitude response, and the magnitude of the second threshold is lower than the initial amplitude of the response.

Preferably, the initial amplitude of the response is equal to zero. However, the initial amplitude of the response can prinimatsya other positive or negative value.

The first pre-defined algorithm may adjust the first threshold so that its magnitude was proportional to the amplitude of the first peak. Alternatively, it can adjust the first threshold so that its value was the average of a predetermined number of preceding the first peaks. The first predefined algorithm can also adjust the threshold so that its value was based on the measurement of background noise.

It is possible to adjust the second predetermined threshold in accordance with a second predefined algorithm based on the amplitude of the second peak.

In this case, the second predetermined algorithm may adjust the second threshold so that its magnitude was proportional to the amplitude of the second peak. Alternatively, it can adjust the second threshold so that its value was the average of a predetermined number of preceding second peaks. The second predefined algorithm can also adjust the second threshold so that its value was based on the measurement of background noise.

In accordance with the fourth aspect of the present invention, a device for detecting coded magnetic thread is holding the detector magnetic field, the processing system for controlling the response of the detector when the thread passes by the detector, and the response varies from the initial amplitude in the first and second directions for the manifestation of the first peak and then in the first direction for the manifestation of the second peak; the processing system configured to compare the response of the detector with a first threshold, the measurement of the first peak of the detector response and regulation of the first threshold in accordance with a first predefined algorithm based on the amplitude of the first peak.

Preferably the magnetic field detector is made in the form of a linear lattice of magnetic heads, each of which is connected with the corresponding processor. In a typical case, each of the processors magnetic heads connected to the processing system that is configured to implement the method, corresponding to a third aspect of the present invention.

The third disadvantage of the methods known from prior art is that in order to identify the document that carries the thread, it was necessary to use a method that is associated with a cyclic shift of the code, read the thread through every possible permutation and compare each of these permutations with each record in the database. Therefore, 16-bit code, it was necessary t is Klionsky move and compare 16 times with each record in the database.

In accordance with the fourth aspect of the present invention provides a method of identifying coded magnetic thread, including the formation of a digital representation of the thread and comparing the digital representation with one or more known representations, characterized in that the method further includes scanning the digital representation to determine the location of a predefined code sequence; a cyclic shift of digital representation to determine a predefined code sequence in predetermined positions, respectively, the position of the predetermined code sequence in the stored version of each known digital representation before performing phase comparison.

This method overcomes the limitation of the above method of "sliding correlator". By aligning digital representation in the same format in which you saved the known digital representation requires only one comparison for each known digital representation.

Preferably, the digital representation is binary.

Typically, the code is asymmetric, and in this case, the comparison is performed with respect to the converted versions of well-known digital representations, thereby about what redesa orientation coded magnetic thread.

If the measured lateral displacement of the thread, then this measurement can be used to determine which side of the sheet of paper containing the thread is the top.

Alternatively, it may be measured relative displacement of the filament relative to the known magnetic characteristic used to determine which side of the sheet of paper containing the thread, and the magnetic characteristic is the top.

Preferably, before performing the comparison of the digital representation is scanned to determine at least one characteristic that indicates the likelihood that the digital representation is valid.

Preferred examples of signs to determine which scan are as follows:

a) set the least significant and most significant bits;

(b) that the amount of change of bits is within predefined limits;

(C) that the number of bits set is within predefined limits;

d) that a predefined code sequence is present and is in the correct position;

e) that the code is asymmetric.

Typically, different weight is given to different characteristics, depending on their relative importance.

In accordance with the sixth aspect of the present invention, provided by the device to identify a coded magnetic thread containing the magnetic field detector, a processing system for processing signals produced by the detector, for forming a digital representation of the thread and for comparing the digital representation with one or more known representations, wherein the processing system is additionally adapted to scan a digital representation to determine the location of a predefined code sequence and for rotation (cyclic shift) digital representation to determine a predefined code sequence in predetermined positions, respectively, the position of the predetermined code sequence in the stored version of each known digital representation before comparing the digital representation with known digital representations.

Preferably, the processing system is additionally adapted for comparing the digital representation with reversed versions of well-known digital representations, thereby determining the orientation of the coded magnetic thread when the code is asymmetric.

The device may further include a detector for measuring lateral displacement of the thread to determine t the th, which side of a sheet of paper containing the thread is the top.

Typically the processing system is additionally configured to scan a digital representation to detect the signs that indicate the probability that the digital representation indeed, before performing the comparison.

In accordance with the seventh aspect of the present invention, a device corresponding to the sixth aspect of the present invention to perform the method, corresponding to the fifth aspect of the present invention.

Example reader coded magnetic thread and ways, corresponding to the invention described below with reference to the drawings, in which:

Fig. 1 - schematic representation of the reader coded magnetic thread corresponding to the invention;

Fig. 2 - view of the two bills containing coded magnetic thread that is moved by a linear matrix of magnetic heads, and one banknote beveled;

Fig. 3 is a block diagram of a signal processor for processing signals from a matrix of magnetic heads;

Fig. 4 - the response generated by the magnetic head when the magnetic element passes under it, and the corresponding signals produced by the signal processor;

Fig. 5 - the response generated by the magnetic head when the window is first magnetic element passes under it;

Fig. 6 is an example of a possible code contained in the coded magnetic thread after restoring the signal processor;

Fig. 7 is a block diagram of a software algorithm executed by the microprocessor;

Fig. 8 - individual magnetic head comprising a permanent magnet;

Fig. 9 is an alternative matrix of magnetic heads;

Fig. 10 is a block diagram of an alternative signal processor;

Fig. 11 - the idealized waveform for embodied different magnetic properties in coded thread;

Fig. 12A and 12B graphics successful and unsuccessful calibration;

Fig. 13 - the effect of changes in grain size;

Fig. 14 - various types of voltage peaks;

Fig. 15 - various processed spades;

Fig. 16 is an illustration of code signals corresponding code, and the result stored data.

Schematic representation of the reader coded magnetic thread-readable codes stored in coded magnetic thread sheet on the document shown in Fig. 1. The reader contains a linear matrix 1 of 12 magnetic heads 2A - 2l, each of which is connected with the individual processor 3a-3l. The analog signals produced by the magnetic heads, is converted into digital form by the processors 3A - 3l signals, which carries the microprocessor system 4.

Software executed by microprocessor system 4 performs additional processing of the digitized signal to convert the code to a known format and compare it with a database of known codes. The software also fixes the maximum positive and negative deviations of the analog signal using an analog-to-digital Converter microprocessor systems 4 and calculates the corresponding thresholds of these data. These thresholds are set in the processors 3A-3l signals using digital-to-analogue converters microprocessor systems 4.

In Fig. 2 shows a linear matrix 1 magnetic heads 2A-2l and two sheet document 5, 6, moved by the transport system documents (not shown) so that they will pass through the matrix 1 magnetic heads 2A-2l. Each sheet 5, 6 has a coded magnetic thread 7a, 7b. When the sheets 5, 6 are approaching the matrix 1 magnetic heads 2A-2l, a permanent magnet embedded in the matrix 1, temporarily magnetizes the magnetic material forming the filament 7a, 7b.

The configuration of one of the magnetic heads shown in Fig. 8. It contains the core 60, which may be made of ferrite, around the shoulders which is wound two coils 61A, 61b. The permanent magnet 62 provides a magnetic bias in the air ZAZ is re core, what causes temporary magnetization of the magnetic material. As the thread 7a, 7b pass by the magnetic heads 2A-2l, electromotive force is produced when the flow generated by the magnetic material, branches off in coils 61A, 61b of the magnetic heads 2A-2l. Therefore, the signal produced on the outputs of the magnetic heads 63, respectively, the structure of the magnetic material forming the filament 7a, 7b.

The sheet 5 is moved by the transport system documents in such a way that the thread 7a appears to be perpendicular to the linear matrix 1 magnetic heads 2A-2l. You can see that the thread 7a will be directly under the magnetic head 7f, and the code included in the magnetic thread 2f, can be recovered from the signal produced by the magnetic head 2f separately.

However, the sheet 6 is moved so that the thread 7b beveled. Therefore, although the thread 7b initially held just under the magnetic head 2h, as it is moving, it will pass under the magnetic head 2g, the magnetic head 2f and, in the end, under the magnetic head 2E. To restore the code it is necessary to combine the signals generated by all four magnetic heads 2E, 2f, 2g and 2h, the appropriate method.

This is one reason why you want a matrix of magnetic heads. Another reason is that the lateral displacement of the thread may R slechts for different documents.

An alternative configuration for the matrix 1 magnetic heads shown in Fig. 9. In this configuration, the matrix 1 contains 13 magnetic heads 100A-100m. However, these magnetic heads 100A-100m configured not in linear form. Instead, they are configured on two parallel axes, and magnetic heads 100A-100g located on the first axis, and the magnetic head 100h-100m are located on the second axis. It is clear that it was possible to arrange the magnetic head 100A-100m so that they were on three or more axes.

Before the signals produced by magnetic heads 100A-100m, can be processed, they must be appropriately shifted in time. Or signals produced by magnetic heads 100A-100g lying on the first axis, or signals produced by magnetic heads 100h-100m, lying on the second axis, or both must be shifted in time so that they were aligned. This can be done using the methods of analog or digital processing, using a pre-defined distance between the first and second axes and the speed of the sheet document, passing under the matrix 1, for determining the amount by which the signals produced by magnetic heads lying on the same axis must be shifted in time so that they are combined with signals, rabotniki magnetic heads, lying on the other axis. The speed of this sheet document can either be measured directly or can be determined speed transportation system document.

Magnetic heads used in these examples represent the inductive head, but can also be used magnetoresistive head.

The processors 3A-3l signals and software implement the signs that enable the detection of the thread regardless of its lateral displacement and recovery code from the signal generated by the various magnetic heads, when the thread is cut.

One channel processors 3A-3l signals is described below with reference to Fig. 3. In the following description, n refers to the number of the corresponding channel and takes integer values from 0 to 11.

Analog signal HEAD[n]generated by the magnetic head, forms the input signal paraphase amplifier 10A, 10b. Inverted and non-inverted outputs of the paraphase amplifier 10A, 10b are connected to the inputs of a pair of Comparators 11a, 11b and with the inputs of the 2:1 multiplexer 17A, 17b. The Comparators 11a and 11b compare the output signals with a two-rail amplifier with a separate variable thresholds. If the inverted output signal from the paraphase amplifier 10A, 10b exceeds the input threshold value of the comparator 11a, the output of the comparator 11a is N. sci level, which then translates the output of the logic "And" 12 to a low level, and since this output is connected to the input of purification schemes-latch 14 D-type, Q-output of latch 14 D-type has also been translated into a low level. Similarly, if the input CLR[n] with a microprocessor system 4 is transferred to the low level, the Q-output of latch 14 D-type also translates to a lower level.

If non-inverted output signal paraphase amplifier 10A, 10b exceeds the threshold of the comparator 11b, the output signal of the comparator 11b is transferred to low level. This output signal is inverted by the inverter 13 and then fed to the clock input circuits-latch 14 D-type. Thus, since the D-input of the differential-lock 14 D-type continuously connected with the high level, the Q-output of latch 14 D-type has also been translated into a high level.

The threshold values of the comparator 11a and 11b are determined by the microprocessor 4 via the output signal of the DAC[n]. This output signal is supplied to a buffer 15 unity gain before submission to the threshold input of the comparator 11b. The output buffer 15 unity gain is also connected to the divider 16 potential, which reduces the threshold, submitted to the comparator 11a, twice.

Both of the comparator 11a, 11b embody some degree of hysteresis to improve steadily the tee with respect to noise and prevent false switching.

2:1 multiplexer 17A, 17b connects the inverted or non-inverted output of the paraphase amplifier 10A, 10b with the integrating peak detector 19. The logic state of the signal MUX[n] determines which of these two outputs is connected with the integrating peak detector. The inverter 18 inverts the logic state of the signal MUX[n] so that the closed or an analog switch 17A, or an analog switch 17b.

Integrating peak detector 19 detects and memorizes the positive peak of the signal applied to it. He seems microprocessor system 4 as a signal PEAK[n]. This integrating peak detector 19 can be installed in its original state by issuing a RESET signal[n].

Typical signal generated by one particular of the magnetic head, such as those described above, due to the 2 mm magnetic element, passing near it, as shown in Fig. 4. When the magnetic element approaches the cylinder, generated negative peak 21. If the magnetic element is directly under the head, the direction of the magnetic flux is reversed and a positive peak 22. Finally, when the magnetic element is removed from the head, the flow is reversed for the second time and formed the second negative peak 23. This is represented by the signal HEAD[n] figure 4.

Processing of this signal is one of the processors 3A-3l description is on below with reference to Fig. 4. When power is initially switched on, the microprocessor 4 outputs the signals CLR[n] and RESET[n] (reset)to the cascades 3A - 3l was in a known state. The processors 3A-3l signals and then performs the processing of background noise using an integrating peak detector 19. Output signals, PEAK[n], served on analog-to-digital Converter in the microprocessor system 4, and then their values are used to determine the appropriate thresholds for the Comparators 11a and 11b. They are set by the d / a Converter that outputs a signal DAC[n] in the cascades 3A-3l signal processing. This signal is buffered by inverter 15 unity gain, the output of which determines the positive threshold. This output signal is also potentially divided, for example, two times, using the divider 16 potential, which establishes a negative threshold. For example, a positive threshold can be set to four times the maximum noise level, the negative threshold, therefore, can be equal to half of this value. These thresholds can then be adapted and can be modified for each magnetic element, a scanning head. For example, the moving average positive peak generated by the magnetic element can be calculated and used fordetermination of a suitable positive threshold. The threshold value may be stored in nonvolatile memory so that it will not be lost when you turn off the device.

The signal MUX[n] is now being translated to a high level, and the processors 3A-3l signals awaiting arrival of the valid signal generated by the magnetic element. When the magnetic element approaches the magnetic head, the signal HEAD[n] is induced by a negative emission. This negative emission is inverted by inverting the output of the paraphase amplifier 10A, 10b, and integrating peak detector 19 memorizes the maximum value of this release. When the magnetic element is held under the head, the direction of the magnetic flux is reversed and is induced by a positive overshoot signal. If positive emission signal exceeds the positive threshold, the clock pulse is applied to the circuit-latch 14 D-type, causing the transition of the Q output at a high level. It generates an interrupt in the microprocessor system 4, which is logged. As a result of this interrupt, the value of the negative peak is logged, and integrating peak detector 19 is reset, and the signal MUX[n] is translated into a low level, so that the positive peak can be yourself integrating peak detector 19. When the magnetic element is moved from the head, the direction magnitno the flow is reversed for the second time and formed the second negative emissions. The rapids are now adjusted so that a negative threshold had a value that is derived from the immediately preceding negative peak. If the signal exceeds this threshold, then the signal MUX[n] is translated to a high level, so that the integrating peak detector 19 controls the presence of this negative maximum, and is given an input signal of the reset circuit-latch 14 D-type, so that the interrupt signal of the microprocessor system 14 is reset. This event is logged, and, therefore, can be defined pulse duration of the interruption. The length of the magnetic element can be determined from the duration using the clock signal, which is produced by the transport system. After this event is registered, the registered value of the positive maximum, integrating peak detector 19 is reset and the signal MUX[n] is translated to a high level, so you might find the following negative peak. The amplitude of the positive peak is used to determine when the beveled thread passes from one magnetic head to a neighboring as described below.

Because the thresholds can be adjusted, the system allows for significant variations in the flux density of the magnetic material. Such variations can be caused by various conditions on the I sheet documents load-bearing threads, the deviation in the displacement between the magnetic heads and threads or speed change transmission system documents.

A significant advantage of using separate positive and negative adaptive thresholds is that the system can correctly measure the length of the longer of the magnetic elements. In Fig. 5 illustrates a typical signal generated when the magnetic element length of 6 mm passes by the magnetic head. The rate of change of flux approaches zero, when the long element, such element is directly under the head. Consequently, the induced electromotive force also approaches zero. This can be seen as a failure 30 in Fig. 5. You can see that because there are positive and negative thresholds, interruption begins at the point 31 and ends at the point 32, as needed. However, if you were to use only positive threshold, then generating two interrupts, the first of which begins at the point 31 and ends at the point 33, and the second begins at the point 34 and ends at the point 35.

Thus, when the magnetic encoded the thread passes under the head, the magnetic elements are restored in a digital code. A possible example of such a code is shown in Fig. 6.

Software in high performance embedded acessorios system 4 provides appropriate output signals to the processors 3A-3l signals at the correct time and the response to these input signals so that so that you can restore the data read from the magnetic code. To accomplish this, the software is divided into two main parts. There are six synchronously running processes and three service routines interrupt.

The flowchart of the algorithm performed by the software shown in Fig. 7. The operation of the individual procedures of the software and routines interrupt service described below with reference to Fig.7.

Microprocessor system 4 starts the processing procedure execution process "standby" (standby) 50. This process is responsible for the basic initialization function, including ensuring there are not any failures of other processes, software, generating reports of these failures, if necessary, and check whether there are any communications not related to run-time. Then execution jumps to the process "perform" 51 on request, if no current failures.

Is the process "perform" 51 performs various initialization routine so that you can carry out measurements of background noise for proper installation positive thresholds. Therefore, all interrupts are blocked, the output of MUX[n] is translated into a low level, so that integrating icopy detector 19 registers the values of the positive peaks. Finally, the memory arrays for data heads are initialized by setting the pointers to the beginning and if there are no recorded failures, execution proceeds to the process of "calibration" 52.

This process is responsible for registering the maximum background noise present on all heads. This is done by measuring the maximum noise for 32 blocks of 1 MS each, and averaging the maximum proyektirovanive for each of these blocks. Digital rapids is now set in relation to the measured noise and if not registered failure, then the process proceeds to the process "setup capture" 53.

The following three process "setup capture" 53 "fulfillment" 54 and "the code" 55 together form the basic execution cycle during which accepts data from the magnetic heads 2A-2l. Is the process "setup capture" 53 begins with signal MUX[n], so that the integrating peak detector 19 registers the values of the negative peak. The storage array code is initialized and enable interrupts. If no failure is not registered, the execution proceeds to the process "perform" 54.

The other two processes execute" 54 and "the code" 55 collect the data read from the processors 3A-3l signal level in a known format and compare them with the database is izvestnyh codes. It is important to realize that the data from the processors 3A-3l signals were indeed introduced in two routine servicing interrupts, which occur in response to interrupts generated by the processors 3A-3l signals. A particular advantage of using interrupts is that there is no need to scan the entire matrix of magnetic heads 2A-2l until then, until you have discovered the actual signals. Therefore, the microprocessor 4 can perform other tasks when there are no valid signals. Routine servicing interrupts are described below.

Is the process "perform" 54 provides the designing of a bit sequence of the data submitted by the routines interrupt service, and recovery code if the thread is cut. This process also controls the bit sequence for the presence of the marker section, and when the received quite a bit and not registered error, the process execution proceeds to process "calculate code" 55. An example of the marker section of the possible code shown in Fig. 6 and the marker section in this case is the inverse combination 1010.

If the thread is cut code is restored as follows:

a) Before the thread is in close proximity matrix of magnetic heads 2A-2l, all interrupts are permitted.

b) is when the thread induces a signal in one of the magnetic heads 2a-2l, the corresponding signal processor causes the interrupt.

with This magnetic head is indicated as the main head, and two directly adjacent heads are referred to as secondary heads. The interrupt mask is modified so that only allow interrupts these three heads.

d) values of the positive peaks of the induced signals are used to determine when the thread will be moved from the primary head secondary head. For example, when a thread crosses the matrix 1 magnetic heads 2A-2l, it will begin to induce signals in the main and one secondary heads. Ultimately, the signals induced in the secondary cylinder exceeds the signal induced in the main cylinder.

e) At this point, the corresponding secondary cylinder is designated as the master cylinder, and two directly adjacent magnetic heads are referred to as secondary heads. The process continues further in the same way.

Therefore, the software allows you to recover the code simply by implementing logical "OR" on the data accepted by all heads that were primary or secondary, as the thread is passed through the matrix 1 magnetic heads 2A-2l. The advantage of this is that you need to keep only the relevant information. Si is Nala, the generated magnetic heads which are not designated either as main or as secondary, can be ignored and discarded.

Is the process "calculate code" 55 begins with finding the beginning and end of the generated code. It works from the center received code outward, as in this case, it is less likely that it will be distorted by other magnetic properties, which may be present and located layers at the edges of the sheet. When the location of the beginning and end of the code is defined, the process searches for the repetition code, which is used as verification that the code is correct. The code is then aligned according to a common format and compared against a database of known codes for finding the best matching. If agreement is found, it sets a flag to indicate this fact is relevant to the process implemented by the software. Execution then returns to the process "setup capture" 53, so that can be detected (captured) the following code.

The code is aligned by saving it in the ring buffer and the cyclic shift up until the marker section will not be in a known position. The advantage of this is that you only need one compared with each entry in the database, while the method of moving is arrestee requires cyclic shift m-bit code for each of its m permutations and compare each permutation with each record in the database.

Aligned code is compared with the entries in the database by applying a logical exclusive OR operation to the code and for each record. The number of bits set in the aligned code is divided by the result of the exclusive OR operation. The lowest value indicates a better match.

In addition to this comparison, to determine the probability that the received code has an error, can use various methods of weighting processing. This can be done by searching for some signs of the code, for example:

1. Confirm that the most significant and least-significant bits are set.

2. Confirm that the number of changes of bits and the number of bits set are within acceptable limits.

3. Confirm that the marker section is present and is in the correct location.

4. Confirmation that the code is asymmetric.

Finally, if the code is garbled and you can't use the above methods of alignment and comparison, the software will attempt to reconcile the received data using the method of the sliding correlation. Still used methods of weight processing.

There are two service routines interrupt that can record code embodied magnetic thread. The first of these routine 56 service at the front FR the NTU interrupts responds to the leading edge of the interrupt generated by the scheme-clamp 14 D-type processors 3A-3l signals, and the second sub-program 57 maintenance on the trailing edge of the interrupt - responds to the falling edge interrupts.

Upon detection of the leading edge of the interrupt occurs, the routine 56 maintenance on the leading edge interrupts. This routine registers the value of the negative peak, and this value is used to set the negative threshold for the subsequent negative peak.

This event also receives the timestamp is converted to a displacement transmission system using a clock signal which is synchronous with the drive mechanism of the transportation system. A peak detector 19 is then reset and the signal MUX[n] is subjected to the operations of negation, so that the multiplexer 17A, 17b represents a positive signal for integrating peak detector 19.

When the detected falling edge interrupt is a subroutine 57 maintenance on the trailing edge of the interrupt. This routine registers the value of the positive peak with the integrating peak detector 19. This value is used to track the thread, if it is beveled and is moved from one magnetic head to another. This event receives a timestamp in the same way as did the camping for the front of the font, so what can be defined the length of the magnetic element. The maximum value stored in the integrating peak detector 19, is cleared, and the multiplexer 17A, 17b is set to search for negative peaks. A pointer to the memory array is shifted to the next bit.

The third routine maintenance interrupt - routine 58 maintenance of scan ADC -- assures regular transformations 12 signal PEAK[n] with processors 3A-3l signals using analog-to-digital Converter microprocessor system 4. These conversions are started automatically by the timer interrupt. This is done to reduce the overhead of the processor. The converted values are stored permanently only if required, as when detecting the leading or trailing edge of the interrupt.

After a successful comparison of the received code with the record in the database, you may be able to determine some information about a sheet document. For example, if the sheet document is a bill, it may be possible to determine its value. On this basis it would be possible to send the bill to the desired destination, for example to divide the bundle of banknotes under the two denominations. Alternatively, you can stop the transportation of the document, if the code is thread is not read or banknote is popular denomination found in the bundle of banknotes of one denomination.

If the code is asymmetric, it is possible to determine the orientation of the sheet. If you can determine the location of the sign sheet, which is offset from its center, it is possible to determine which side is facing up the sheet. For example, using an optical detector can determine the lateral position of the thread and it can be used to determine which side up facing sheet. Alternatively, the position of the known magnetic characteristic relative to the filament can be determined, and this can be used to determine which side up facing sheet.

In Fig. 10 shows a modified device. In this case, the head 2A-2l are connected to the ADC 200, which is connected to the digital processor 205 signals. The purpose of this digital processor 205 signals is processing the digitized data and generating sequences of digital signals representing the code stored in the magnetic characteristics. These waveforms are presented to the microprocessor 4, where the algorithms are applied approval code combinations to determine the authenticity and denomination of the banknote. The key advantages of this approach are the following:

- Design flexibility - algorithms DSP and the microprocessor is easily modified and updated without affecting other system components.

- Shared CPU load by placing tasks in the DSP data reduction to generate relatively simple digital waveforms indicates that the microprocessor has more performance for more complex algorithms coordination structures signals, which will contribute to the improved performance of the machine.

- Easy pairing of devices ADC, DSP and microprocessor support relatively simple communication protocols to exchange data.

In the process, using instructions from the DSP 205 for each head, ADC 200 discretetime analog signal every 0.25 mm, generates a digital representation and transmits it to the DSP. While the ADC 200 is busy converting the current sample, the DSP 205 performs the processing of the previous sample obtained from an adjacent channel in the conveyor structure. This process is repeated until then, until you have obtained data for all banknotes; thus, processing is performed in real time.

Discretization of the pair of channels controlled by the synchronized timer with a fixed period of 9.4 μs. In order to ensure that each scan corresponds to a step of 0.25 mm, the system requires the measurement of the linear velocity of banknotes. It is provided premazepam disk, comprising the C slot of uptodatecom (not shown), as is well known. This provides a pulse corresponding linear movement on 4,42 mm By measuring the number of pulses of the timer, which arose within the cracks breathalyser disk, the system may determine the delay of the sampling rate, which is introduced to ensure the required sampling.

Sampling and data processing of banknotes is initiated by instructions of the microprocessor 4 and the tracking sensor (not shown). Witness the sensor is a reflective optical sensor that provides an indication of the presence of banknotes under the detector. As soon as the macro processor 4 has issued a statement in the DSP 205 for processing banknotes, the system will wait up until the tracking sensor will not show that the note was received, and then will begin processing.

The DSP 205 performs three main tasks of processing:

- Threshold processing and initial detection of the peaks.

- The use of a priori information on useful signals for the pre-processed data.

- Generation of digital waveforms for the microprocessor.

Threshold processing and initial detection of peaks

The algorithm used to generate digital waveforms for the microprocessor 4, includes peak detection and conversion of the a priori known signals. Peak detection is used sweat the mu the signals received from the inductive magnetic heads based on the rate of change of magnetic material, passing the head. So the boundaries between material with magnetic and non-magnetic properties arise transients. An example of idealized waveforms for different values of the magnetic properties shown in Fig. 11.

From 11, you can see that the peak detection can be used for determining the length of the magnetic fields along the same plane. The problem with using peak detector such problems inherent to any detector speed changes, and is that it is susceptible to noise signal. In practice, noise will be present in the input signals and therefore require mechanisms to reduce the impact of these artifacts. For ensuring a level of resistance to noise can be used two schemes: the calibrated thresholds and larger window peak detection.

Calibration

Calibration requires that the system could generate a suitable threshold for each channel. Such thresholds will be used to stop processing signals of small amplitude, which, although able to meet peak detector caused by system noise, and not the actual magnetic material, passing the head. The calibration scheme is ostoic in the following.

In a processor that performs processing on the bundle of bills after the actuators transportation has reached the desired speed, the microprocessor 4 issues an instruction in the DSP 205 to enter calibration mode. At this stage, the DSP 205 takes 32 samples and generates the average of the absolute level. Creates a threshold that represents a constant multiple of the average level, and the generated value is stored. Finally, to test whether any of the channels are noisy or have a relatively widely distributed signal levels due to causes other than the investigated banknotes, the DSP 205 explores the 32 sampling in order to ensure that exceed any of them calculated threshold. If so, the calibration is recognized unsuccessful, otherwise the calibration is successful, and the processing of banknotes can continue. The process is repeated for the other channels. If calibration is unsuccessful, the DSP 205 informs the microprocessor 4 ticket to work and intervention is required.

The calibration process is performed on each bundle.

Illustration of two examples of calibration is shown in Fig. 12A and 12B.

Grain peak detection

The second scheme is to ensure a level of stability with respect to noise consists in selecting the grain peak detection applied to the data. Instead ISOE is isawanya grain, based on the rate of change, which tracks the differences between directly adjacent values (size 3), the approach used in this solution is to track the next nearest neighbor (size 5). A simple example illustrating the advantages of size 5 over size 3 in terms of the number of detected peaks, shown in Fig. 13.

Signal, the amplitude of which varies in a similar way as in the example mentioned above, for example, the noise will produce a large number of peaks with a grain size of 3, while significantly reduced their number will be generated in the case of grain size 5. Because transitions peaks, due to the boundaries between magnetic and non-magnetic material, are in a greater number of samples than three, the grain size 5 is small enough to track these transitions and at the same time provides the required level of robustness to noise.

To create a digital signal form suitable for processing by the microprocessor 4, the system applies a peak detector size 5 to the real-time data at their collection and adds valid peaks (i.e. local minima or maxima that exceed a threshold strip) to the list containing information about the peaks that were found in the specified channel. The stored data represents the position of the banknotes along the parallel to its short edge, where was detected peak of the detected peak (i.e. positive or negative peak) and the location in memory of the DSP 205, where the original (raw) analog data from the ADC 200 for this peak. The advantage of this method is that the amount of data that must then be analyzed and processed, are greatly reduced. This provides additional flexibility for more complex algorithms, since the amount of data is reduced.

At this stage, the DSP 205 has developed (for all 12 channels) set of events that contain all peaks that satisfy the threshold criterion treatment. The next process is to study these peaks and determining which of them are valid and indicate the true events of the magnetic transitions, and which are due to artifacts of the signals.

The use of a priori knowledge of useful signals to the data pre-processing

Each of these voltage peaks are individually checked against more stringent criteria. These criteria include the key characteristics of the actual magnetic transitions, including review by the absolute levels of induced voltages and verify the signature of the peak voltage. Any peak voltage, which does not pass validation against these criteria is discarded. In Fig. 14 illustrates this paragraph is by KAZ, each of the peaks that pass this initial routine level of the node is classified as valid or invalid.

This is the resulting subset of the initial peak voltage is processed to further remove any existing error signals. This is partly due to the estimation of relative locations, sizes and shapes of each peak, with respect to any other peaks that are in close spatial proximity to it. This ensures that the peaks that occur due to the increase of the magnetic flux in the detector, consistent with peaks that correspond to the decrease of the magnetic flux in the detector. Due to the complex dynamics of banknotes that takes place during the passage of the bill detector, there may be situations, when there is ambiguity regarding how the peaks should contact together. For example, two high voltage can occur in the absence of the minimum voltage between them. In this case, depending on the parameters associated with these peaks and other peaks, which are in close spatial proximity, or the first peak or the second peak, or both peak can be discarded, or it calculates the likely position of the undetected lows. These solutions PR is determined on the basis of the criteria identified from empirical or theoretical studies detected signals from the actual banknotes are introduced into the device. This processing step generates a refined set of peaks for each channel, where with high probability was filtered large proportion of erroneous peaks. This process is illustrated in Fig. 15. The relative location, size and signs of the peaks is schematically shown by a symbol "x". One peak rejection, because the peak of the falling edge had to precede the corresponding peak rising edge within a specified distance (where distance represents the length, including the tolerances for the longest expected magnetic field). Another peak rejection based on the properties of the peak, because there are two peaks rising fronts, with only one peak falling edge.

This refined set of peaks is checked to ensure that long magnetic area is not assessed as being made of two shorter magnetic transitions. Again this is done by evaluating the relative properties of a given group of peaks with those identified in the process of empirical research notes.

The development of digital waveforms

The data required for the microprocessor 4 represent the flow of digital data stored in the memory of the DSP for each channel of This stream is divided into blocks of data, which can be stored in a separate memory cells, and bit 1 corresponds to the sample of 0.25 mm, So for memory 16 bits each cell will correspond to a length of 4 mm banknotes. When events proven transitions are confirmed, the bitstream is constructed for each channel. Once all of the bits recorded in the individual memory cell, the LTP moves to the next memory cell. An example of this is shown in Fig. 16.

1. The method of detecting a magnetic filament comprising providing relative movement between the filament and the matrix of magnetic heads, each of which generates a signal upon detection of thread, the detection of the approach of a thread in one of the heads, and the designation of her as the main head, and heads on each side, as a secondary heads; control then the output signals from the primary and secondary heads for envisioning thread, comparing the amplitudes of signals from the primary and secondary heads so that if the amplitude of the output signal from the secondary heads will exceed the amplitude of the signal from the main head, the main and secondary heads are redistributed accordingly.

2. The method according to claim 1, in which the magnetic thread is a coded magnetic thread.

3. The method according to claim 2, in which code embodied in coded magnetic thread, restored p is the combining of the output signals from all of the heads, who were both main and secondary, using a logical OR operation.

4. The method according to claim 1, in which the peak values of the outputs of the primary and secondary heads are used to determine when the output signal from the secondary heads exceeded the output signal from the main head.

5. The method according to claim 1, in which the magnetic thread is on the sheet document.

6. The method according to claim 5, in which the sheet document is a document with protection, such as a banknote.

7. The method according to claim 6, further comprising determining the denomination of the banknote from the view of a thread.

8. The method according to claim 1, in which the signals generated some of the magnetic heads move in time to align them with the signals generated by other magnetic heads.

9. Device for the detection of magnetic filaments containing a matrix of magnetic heads, each of which is connected with the corresponding processor, which processes the signals generated by the respective magnetic head, and a processing system associated with the processor, the processing system is designed to perform the method according to claim 1.

10. The device according to claim 9, in which the device further comprises a transport system documents for moving the document relative to the matrix of magnetic heads, and the transport system is ovci stops the document if the processing system is unable to identify the document from the view of a thread.

11. The device according to claim 9, in which the matrix of magnetic heads comprises at least one permanent magnet.

12. The device according to claim 9, in which the processor generates an interrupt signal when the corresponding detector detects the arrival of the magnetic part of the thread, and the processing system supports the interrupt mask in accordance with the primary and secondary heads.

13. The device according to claim 9, in which the matrix of magnetic heads is a linear matrix.

14. The device according to claim 9, in which the magnetic head is ordered so that some are on the first axis and the other on the second axis, which is parallel to the first axis.

15. The device according to claim 9, in which the matrix of the magnetic head includes an inductive magnetic head.

16. The device according to claim 9, in which the matrix of magnetic heads includes the magnetoresistive magnetic head.

17. Method detection coded magnetic thread that contains the dimension of the detector response of the magnetic field, when the thread passes by the detector, and the response varies from the initial amplitude in the first and second directions for the manifestation of the first peak and then in the first direction for the manifestation of the second peak; comparing the response with the first and second thresholds, located alloparental values in the first and second directions, respectively, and indicate the passage of a code element of the thread when the response passes through the second door and then through the first threshold is a predefined manner, wherein the first threshold is adjusted in accordance with the first predefined algorithm based on the amplitude of the first peak, or so that its amplitude is the average of a predetermined number of previous peaks, or so that its amplitude is based on the measurement of background noise.

18. The method according to 17, in which after the response showed a second peak and then changed in the first direction, it changes in a second direction to return to its original amplitude, thereby showing the third peak.

19. The method according to 17, in which after the response showed a second peak and then changed in the first direction, it changes in the second direction and then in the first direction for the manifestation of the third peak and then modified in the second direction to return to its original amplitude, thereby showing the fourth peak.

20. The method according to 17, in which the first direction is a negative direction and the second direction is a positive direction.

21. The method according to 17, in which the initial amplitude of the response is equal to zero.

22. The method according to 17, in which the second pre-determined as the threshold is adjusted in accordance with second predefined algorithm based on the amplitude of the second peak.

23. The method according to 17, in which the second predetermined algorithm adjusts the second threshold so that its amplitude is part of the amplitude of the second peak.

24. The method according to 17, in which the second predetermined algorithm adjusts the second threshold so that its amplitude was the average of a predetermined number of preceding second peaks.

25. The method according to 17, in which the second predetermined algorithm adjusts the second threshold so that its amplitude is based on the measurement of background noise.

26. Device for the detection of coded magnetic thread containing the magnetic field detector, the processing system for controlling the response of the detector when the thread passes by the detector, and the response varies from the initial amplitude in the first and second directions for the manifestation of the first peak and then in the first direction for the manifestation of the second peak, while the processing system is configured to compare the response of the detector with a first threshold, near the initial amplitude in the first direction, the measurement of the first peak of the detector response and setting the first threshold in accordance with a predefined algorithm based on the amplitude of the first peak.

27. The device according to p, in which the magnetic detector is Olya is a matrix of magnetic heads, each of which is connected with the corresponding processor.

28. The device according to item 27, further containing a processing system which is connected to each of the processors of magnetic heads.

29. The method of identification coded magnetic thread containing forming a digital representation of the thread and comparing the digital representation with one or more known digital representations for finding the best matching between the digital representation of the thread and one or more known digital representations and thereby identify a coded magnetic thread, characterized in that the method further comprises scanning digital representation to determine the location of a predefined code sequence, the cyclic shift of the digital representation to determine a predefined code sequence in a predefined position corresponding to the position of a predefined code sequence in the saved version of one or each known digital representation before performing phase comparison.

30. The method according to clause 29, in which the digital representation is binary.

31. The method according to clause 29, which code is asymmetric.

32. The method according to p. 31, in which the comparison is performed with about asenime versions of well-known digital representations, this is determined by the orientation of the coded magnetic thread.

33. The method according to p in which lateral displacement of the thread is measured and used to determine which side of the sheet of paper containing the thread is at the top.

34. The method according to p, in which the relative displacement of the filament relative to the known magnetic characteristic is measured and used to determine which side of the sheet of paper containing a filament and the magnetic characteristic is at the top.

35. The method according to clause 34, which before performing the comparison of the digital representation is scanned to find at least one characteristic, which indicates the probability that the digital representation is valid.

36. The method according to p in which the digital representation is scanned to confirm that the least significant bit and most significant bit is set.

37. The method according to p in which the digital representation is scanned to confirm that the number of changes of bits is within predefined limits.

38. The method according to p in which the digital representation is scanned to confirm that the number of bits set is within predefined limits.

39. The method according to p in which the digital representation is scanned to confirm that the pre is sustained fashion a particular code sequence is present and is in the correct position.

40. The method according to p in which the digital representation is scanned to confirm that the code is asymmetric.

41. The method according to p, where different weights are applied to different signs, depending on their relative importance.

42. A device for identifying a coded magnetic thread containing the magnetic field detector, a processing system for processing signals generated by the detector, for forming a digital representation of the thread and for comparing the digital representation with one or more known digital representations for finding the best matching between the digital representation of the thread and one or more known digital representations and thereby identify a coded magnetic thread, wherein the processing system is additionally designed to scan digital representation to determine a predefined code sequence and a cyclic shift of the digital representation to determine a predefined code sequence in a predefined position corresponding to the position previously a specific code sequence in the saved version of one or each digital representation before comparing the digital representation with known numbers of the new view.

43. The device according to § 42, in which the processing system additionally is designed for comparing the digital representation with reversed versions of well-known digital representations, thereby determining the orientation of the coded magnetic thread.

44. The device according to § 42, optionally containing a detector for measuring lateral displacement of the thread to determine which side of the sheet of paper containing the thread is at the top.

45. The device according to § 42, in which the processing system is additionally configured to scan digital representation to detect the signs that indicate the probability that the digital representation is valid before performing the comparison.

Priority items:

08.01.2001 on PP. 1-7,9,11-13, 26-32, 35-40, 42-43, 45;

11.06.2001 on PP. 8, 10, 14-25, 33-34, 41, 44.



 

Same patents:

The invention relates to a device for detecting properties of a sheet material, such as banknotes or securities, using reflected light

The invention relates to protective devices, in particular to a protective device or element having a large number of security features for use with valuable goods or items

The invention relates to a method of detecting particles in the base, the electromagnetic properties of which differ from the electromagnetic properties of the particles, as well as to the basics and counterfeit documents containing such particles

The invention relates to the verification and counting of documents and detection of false documents various documents

FIELD: magnetic thread recognition means.

SUBSTANCE: method provides for relative movement between thread and matrix of magnetic heads; each head generates a signal in case of detection of a portion of thread. Approach of thread to one of heads is detected, while this head is marked as main head, and heads on each side of the latter - as secondary heads. Output signals from main and secondary heads are controlled for forming of an image of thread signals amplitudes from main and secondary heads are compared, so that if amplitude of output signal from secondary head exceeds amplitude of signal from main head, then secondary and primary heads are appropriately reassigned.

EFFECT: higher speed of operation, higher efficiency.

6 cl, 17 dwg

FIELD: protective devices, in particular, protective threads using multiple detectable protective elements.

SUBSTANCE: detectable protective elements mainly contain unnecessarily repeating drawing of discontinuous metallic/magnetic marks and discontinuous metallic signs or signs formed of metallic points. Detectable protective elements can also include at least one metallic stripe, extended along length of carrying substrate and/or multiple metallic points, positioned on portions free from metal of at least one surface of substrate.

EFFECT: device has multiple detectable protective elements, some of which are not easily detected and recognized during visual observation of protective device.

3 cl, 5 dwg

FIELD: engineering of means for studying properties of sheet material, bank notes for example.

SUBSTANCE: in accordance to invention, bank notes are researched having magneto-optical layer with optical properties changing under influence of magnetic properties of object. During research, light source is utilized for light generation and injection of light into magneto-optical layer. Detection of light passing through magneto-optical layer and/or reflected by aforementioned layer is performed. Light source and magneto-optical layer are positioned so, that light injected into magneto-optical layer expands mostly in parallel to main surface of this magneto-optical layer.

EFFECT: increased precision and reliability of research of magnetic properties of sheet material.

3 cl, 4 dwg

FIELD: textile; paper.

SUBSTANCE: invention concerns measurement means for physical properties of sheet material. Sensor device for optical measurement of at least two different properties of sheet materials, particularly banknotes (100), includes common measuring window (2), to which at least two sources (B1, B2) of different electromagnetic emission suitable for measurement of different properties are directed. One or more detectors (D1-D3) directed towards measuring window detect reflected, reradiated, missing and/or fluorescent emission. In particular, measuring window can hold magnetic to optic converter (5) for detection of magnetic properties in sheet material which features dichroic reflector coating (5c) and reflects emission used in magnetooptic measurement at one wavelength band while missing emission at another wavelength band. Such multipurpose sensor device can be compact and perform control of most different physical properties.

EFFECT: measurement of maximum number of different properties of sheet material by a compact device.

12 cl, 10 dwg

FIELD: instrument engineering.

SUBSTANCE: invention concerns banknote identifying and counting machines. The machine comprises involves a banknote feeder; feed/carry unit for single banknote feed and carrying over with a tape feed; identifying/counting unit arranged on an underside of the feed/carry unit to identify a name and count banknotes carried over; storage box for banknotes that have been detected and judged as conforming with norm. In addition, the machine accommodates a storage means of the information relative to banknote characteristics wherein the information relative to banknote characteristics as referred to various exchange systems is stored in sections for each exchange system; selection/installation means used to detect conformity of exchange system of banknotes to be process with one specific key that have been selected and carrying over of banknotes depending on pressing the specific key.

EFFECT: invention allows displaying a monetary unit of the exchange system.

6 cl, 5 dwg

FIELD: printing.

SUBSTANCE: invention also relates to a valuable document, translated materials and methods of manufacture of such protective elements and other valuable documents, as well as to the method and device for verification of such a protective element, respectively, a valuable document. A valuable document contains a security element, equipped with at least two magnetic materials with different amount of coercitive force, but with basically the same remanent magnetic induction.

EFFECT: high degree of protection against forgery, with the simplicity of manufacturing.

20 cl, 8 dwg

FIELD: testing equipment.

SUBSTANCE: invention is related to facilities for investigation of magnetic properties of objects (BN), first of all, sheet material, such as, for instance bank notes, with application of magnetooptic layer having magnetic domains. In method and device optical properties of magnetic domains in magnetooptic layer are influenced by magnetic properties of investigated object (BN), at least one source of light (2) for radiation of light falling on magnetooptic layer (42), and at least one detector (6) for reception of light passing through magnetooptic layer (42) and/or reflected by it, and with creation of magnetic field (BN), which spreads in area of magnetooptic layer (42) substantially parallel to its surface.

EFFECT: improved accuracy and reliability of research.

16 cl, 4 dwg

FIELD: information technology.

SUBSTANCE: protective element, particularly for banknotes and bank cards, has a substrate on which there is at least one opaque layer (2) and symbols and/or marks (3) are formed in regions of at least one opaque layer (2), containing, at least in the symbols and/or marks, one or more magnetic elements (4, 6) which are visible in at least transmitted light.

EFFECT: simple manufacture and verification of documents.

34 cl, 10 dwg

FIELD: information technology.

SUBSTANCE: valuable document, transferrable material and a method of verifying such a protective element of the valuable document are also described in the claim. One or more, at most five, magnetic areas and one or more, at most five, empty areas lie along the protective element, for example, along the longitudinal direction thereof. The length of the magnetic areas or empty areas along the protective element is preferably selected such that magnetic signals from neighbouring boundaries of magnetic or empty areas, where there are magnetisation jumps arising when the protective element moves past a magnetosensitive sensor, constructively interfere with each other.

EFFECT: simple verification of a protective element.

25 cl, 8 dwg

FIELD: information technologies.

SUBSTANCE: reading sensor suitable for reading a protection element having magnetic areas with different coercitivity, and comprising at least one first reading head and at least one second reading head, which are arranged in parallel to each other and are arranged as capable of detecting two separate sequences of signals, besides, a permanent magnet is arranged between the specified reading heads, and the specified first and second heads are arranged at the angle relative to the specified element of protection regardless of the direction of displacement of the specified element of protection relative to the mentioned sensor.

EFFECT: providing of the possibility to read elements of protection having magnetic areas with different coercitivity.

13 cl, 11 dwg

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