DE2935668A1 - METHOD AND DEVICE FOR IDENTIFYING THE VALUE OF A BANKNOTE - Google Patents

Description

description

The invention relates generally to automated Banking equipment and in particular an automatic currency discriminator device for currency counting machines and the same.

Many high-quality machines have been used in banking, and particularly automated banking, in recent years developed in the automation of processes that were previously carried out manually in banking transactions are useful. Of particular importance are automatic devices for identifying the value of Monetary means become. For example, in US Pat. No. 3,679,314 different spectral distributions are used Banknote sensed to identify its value. In U.S. Patent 3,870,629, phase locked loops are disclosed used in the detection of frequency properties of each bank note to be checked. In U.S. Patent 3,280,974 the changes in the magnetic flux of a bank note moving past a sensor are used to identify it of the value of the banknote used. The output of a The photodetector is processed by a device that is included in U.S. Patent No. 3 84-5 4-66 for an approximate Form density function that is compared with a stored function. In U.S. Patent No. 4,04-1 4-56, R flection of one or more areas on a bank note to be identified and measured with the reflection compared to a bank note indicated by data in a memory device. A suitable comparison causes the identification of the value of the currency.

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Many of the aforementioned techniques are either very complicated and make difficult detection or they lack the required accuracy, to be able to use them in banking. In addition, the devices described in these patents which are complicated, regardless of their operating speed, also very expensive to purchase.

It is therefore a principal object of the invention to provide a method and an apparatus for distinguishing between To create currency units that are used in high-speed automatic banking machines, • How to use currency counters.

It is another object of the invention to provide a currency discriminator that operates quickly and is very accurate.

According to a preferred concept of the invention, a currency discriminator for determining the value of a bank note or the like has a light source, the light of which is directed onto a bank note to be identified. A strip of χ 2 mm 80 mm is illuminated and the light reflected from the illuminated area _v light is measured by a detector and converted into digital data. Synchronization hardware enables 72 samples to be generated, each with an area of 2mm 80mm, when a bill is moved past the lighting fixture. The digital data is then used to generate a 4-bit correlation number Έ, where

each bit is a 1 if (P _n > P _n _ ₂ ^^ ^P n ^{> P} n-4- ^ ' ^ n * ^P n " ⁶⁾ ' and (P _n > P _n ~ 8), where P _n the current sample and

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Po ^Ζ · Β. is the penultimate previous sample. The correlation number IT is then compared with the corresponding number in a default list for bank notes of different values. A correlation count is made for each value, a comparison being made between the actual correlation number N and the number N in the list, where χ indicates a value of a bank note. If the ratio of the highest correlation count for a bill to the next highest correlation count is equal to or greater than 1.28 and the larger correlation count is at least 28, the bill is identified.

The currency discriminator according to the invention thus uses a sensor arrangement for the optical scanning of bank notes or the like when they are moved past a sensor. A light source is arranged relative to the sensor so that it directs light onto a surface of the bank note, the value of which is to be determined. The sensor measures the light reflected from an area on the note itself, which typically comprises a rectangular area of 2 mm 80 mm and extends from top to bottom on the bank note which is to be identified. A number of such measurements are made from one edge to the other edge of the banknote as it is moved past the feeler. Each of these scanned reflections is digitally stored and after the Eef lessons have been stored, a plurality of multi-bit correlation numbers is formed, the first bit of such a number being 1 if P is greater than or equal to P _n _p, on the other hand the first bit Bit a 0. The second bit of each correlation number is a 1 if P is greater than or equal to '

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9 - 2335668

capital P __ / j. is, or on the other hand it is a G. The third bit is a 1 if P is greater than or equal to Pg, while it is a 0 otherwise. The fourth bit is a 1, x * if P _{n is} greater than or equal to P _n-8 , while otherwise the fourth bit is a 0.

Each multi-bit correlation number thus formed is then compared with previously stored multi-bit numbers, the one 4-bit correlation number obtained from a scan of a corresponding part of a document or a known Banknote is derived. If the multi-bit correlation number from the sampler is the same as the stored one Multi-bit correlation number is a correlation count carried out for a certain value.

After the banknote has been scanned, it will focus on every possible value to be detected by the detector is, related correlation count compared with each other. As long as the ratio of the largest correlation count to the next highest correlation count is 1.28 or is bigger. and the largest correlation count is at least 28, the bill is identified.

The above and other objects, advantages and features of the invention are explained in detail with reference to the drawing. In detail shows:

ig. 1 is a block diagram of the electronic circuit for the currency discriminator according to the invention,

Fig. 1a the sensor of Fig. 1 in schematic form,

Fig. 2 shows the operation of the control switch shown in Fig. 1

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so that the rest of the circuit forms a multi-bit correlation number Ή ,

3 shows the operation of the control of the remaining hardware to determine the greatest correlation number IT,

4-a, 4-b and 4c show the operation of the controls for Determine whether the largest correlation count is equal to or greater than 1.28 χ of the next largest Correlation count is, ■

Pig. 5 is a block diagram of a preferred embodiment the invention,

Fig. 6a is a front view and

6b is a plan view of one in the preferred embodiment sensors used in the invention,

Fig. 7 shows the interconnection of those shown in Figs. 7A and 7B Circuit diagram,

8 shows a voltage regulator for the system,

9 shows the combination of one in FIGS. 9A and 9B analog signal processing device shown,

Fig. 10 shows the interconnection of a main processing device shown in Figs. 10A and 10B, and

11 shows the combination of a device shown in FIGS. 11A and 11B.

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demonstrated digital signal processing equipment.

In Pig. 1 is a schematic block diagram of the invention Currency discriminator shown. This block diagram shows how a bank note 10 symbolically in the direction of arrow 12 on a bank note sensor 14 with the aid of a transport device not shown here is moved past. The sensor 14 is arranged so that an area on the banknote, the is indicated by 16, illuminated and the light reflected by this is detected by the sensor 14-. The feeler 14- is a sensor responsive to the light intensity, which provides a digital representation of the incident on it Emits light.

An embodiment of a sensor is shown in detail in Fig. 1a, where the bank note 10 is also in the direction of arrow 12 is moved. A light source 18 illuminates the surface of the bank note 10 so that light passes through it a shield assembly 20 is reflected onto a light sensor 22. The shield arrangement 20 is physical opposite the light sensor 22, the light source and the banknote 10 so arranged that the one, rectangular surface area, which is about 2 mm 80 mm on one side of the bank note 10, reflected light is detected by the light sensor 22. The analog output of the light sensor 22 is on a video output line designated and, as will be described in detail later, in a Storage device 24 shown in FIG. 1 is stored.

In addition to generating an analog output signal that gives the reflected light a S ₁ rectangular area

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is assigned to the banknote 10, the sensor 14- has a sensor for the distance covered by the banknote which generates a pulse every time the banknote 10 has traveled a known distance, such as one millimeter in the direction of arrow 12. One possibility for realizing such a sensor comprises two rollers 26 of known dimensions which are pressed against one another to close a gap between them form through which the banknote 10 must pass. One of the rollers 26 is coupled to a rotation sensor, which may have a disc with holes or slits through which light passes. A phqto sensor is working with the disc to generate an electrical pulse each time the roller 26 turns a has turned a certain distance. By suitable choice of the dimensions of the rollers 26 as well as those provided with slots Such an arrangement can generate a pulse every time the banknote 10 has passed one Distance of 1 mm has moved further.

These pulses indicating the distance from the sensor shown in FIG used to determine when to sample the video signal to ensure that another Area than that previously scanned is scanned. In the arrangement in which the light reflection should be determined by a surface area of 2 mm χ 80 mm and one pulse for each one covered Distance of 1 mm is generated, every second pulse is used by the rotation sensor of Fig. 1a to that the video output signal is stored in the memory 28.

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The circuit shown in FIG. 1 also has a comparator 30 which is on its output line 31 always generates a signal when the input signal at connection A is greater than that at connection B. Such comparators are generally known in computer technology and are therefore not explained in more detail here.

The circuit shown in Fig. 1 also has an incrementor 33, the operation of which is controlled by the control circuit 28 is determined so that a number is incrementally is counted, which is obtained from the memory 24, and a 1 is added to this number and then this to the Memory 24 · is returned. The one shown in FIG Circuitry also includes a multiplication unit obtained from memory 24 under the direction of the controller 28 data obtained is multiplied to form a number 1.28 χ greater than the input signal to the multiplying unit 32. Such an incrementor and a multiplying unit are also well known in digital computing, so are these are not explained in more detail here.

The 3? Ig. The circuit shown in FIG. 1 also has a display 34- which is connected to the controller 28 and responsive to it to indicate the identity of the value for the bill 10.

In operation, the circuit shown in Figure 1 first operates to provide decimal representation for the output signal from the sensor 14 in the memory 24 to store. This is achieved in that every second of the rotation sensor the pulse obtained in FIG. 1a is a digital one

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Playback is stored in memory 24. The official banknotes currently in circulation in the USA after 72 samples have been scanned across the back of the banknote 10, a sufficient amount of data is in the memory 24 are available to determine the value of the banknote yourself. It should be noted that the back of the Banknote, i.e. the side of a banknote that does not have a portrait, used to differentiate the value because it carries more information than the front side that is relevant to the value of the banknote.

If at least 9 samples P, where η is an integer between 1 and 72, are g0-stored in the memory 24, the controller 28 operates as shown in FIG. 2 to make the systems generate a plurality of multi-bit correlation numbers Ή . As shown in Mg. 2, η is first set to 8 and then counted to 9. The digital reproduction for sample Pq is then compared with the penultimate preceding sample, ie sample Pr ₇ . If Pq is greater than or equal to Pn, a 1 is inserted in the first bit position of the correlation number 1. On the other hand, if Pq is less than Pr ₇ , a 0 is inserted in the first bit position of the correlation number 1. Then Pq is compared with the fourth from last previous sample Pc and if the former is greater than or equal to the latter, a Λ is inserted in the second bit position of the correlation number 1. If, on the other hand, Pq should be less than Pn, then a 0 is inserted into the second bit position of the correlation number 1.

Thereafter, the controller 28 determines whether Pg is greater than or equal to the sixth from last previous sample is P ^. If this

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which is lall, a 1 is inserted into the third bit position of the correlation number 1, and if this is not the pail, a 0 is inserted into the third bit position of the correlation number Λ. Thereafter, the controller 28 determines whether Pq is greater than or equal to the eighth previous previous sample P ^, -. If this is the lall, a 1 is inserted into the fourth bit position of the correlation number 1, and if this is not the pail, a 0 is inserted into the fourth bit position of the correlation number 1.

Thereafter, the controller 28 determines whether η is 72, which the pail will be when all available data has been used to calculate correlation numbers. form. It is found, however, that only 64 such correlation numbers are formed, since those shown in FIG. 2 at the beginning Sequence η is set to 8 so that only these 64 correlation numbers are generated for each checked bank note can. If it is determined that η does not equal 72, then η is counted further and another correlation number is formed according to the sequence shown in Mg. 2. On the other hand, when η is 72, all 64 became correlation numbers is formed and the control can continue to determine whether the correlation numbers are the same are previously stored correlation numbers for known values. The control sequence for determining the equality of the Correlation numbers are shown in FIG.

As shown in FIG. 3, the controller 28 first causes a number U to be set to 0 and then by 1 will continue to be paid. Then the correlation number N is taken from the memory »The correlation is then

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relations numbers H ^, Νγ, H ^ q, U ₂₀ , Nc ₀ ^ ¹¹ * ³ · ¹ ^ OO ' ^{der der}

expected correlation number for each $ 1, $ 5? $ 10, $ 20, S 50, and $ 100 correspond, taken from memory. The instantaneous correlation number IT is then compared with the associated correlation number N for a one-dollar bill. If the two are equal, a dollar count advances. In any case, the control then jumps to a comparison of the current correlation number H with the assigned correlation number Hc for a 5 S grade. When the correlation number H is equal to the correlation number Nr, the $ 5 count is counted on. If this is not the case, the control jumps to a further comparison of the current correlation number N with the correlation number ^ ₀ - The process continues in the manner shown in FIG. 3, whereby the current correlation number N is associated with an associated correlation number is compared for each particular value that can be identified by the device. If the current correlation number IT is equal to an associated correlation number ΪΤ _χ , the associated value count is counted on.

When the current correlation number H has been compared with all of the associated correlation numbers H, the controller checks whether IT equals 64 . If not, the process is repeated for a subsequent value of H.

Upon completion of the sequence of steps shown in the flowchart of FIG. 3, that shown in FIG Switching a $ 1-, $ 5-, $ 10-, $ 20-, $ 50- and ftiOO-count, where the count indicates the number of events at

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which the correlation number N of an associated correlation number N corresponded to the particular value of the banknote.

It should be noted that the above analysis assumes that each banknote is either right-handed Side up or with its top side down when it passes the probe. The system can easily be expanded to check banknotes that are not always aligned in the same way that is, de banknotes face down or right face up could be. This additional feature is achieved in that the instantaneous correlation number IT with all associated correlation numbers F for banknotes with the right side up and with a further group of associated correlation numbers N for banknotes with the top side down is compared. Those skilled in the art will also recognize that this modification is also used for this purpose it can be that the system also has other values of banknotes, how to determine that of a $ 2 bill.

Statistical analysis has shown that when the largest count as indicated by that shown in FIG The sequence is determined to be at least 1.28 χ greater than the next largest count and at least equal to 28, the bill corresponds to that identified by the particular value count which is the largest. If toB. the $ 5 ~ counter reading at least 28 and at least 1.28 χ greater than the $ 1, $ 10, $ 20, $ 50, and $ 100 meter readings is, then the value of the banknote to be checked is equal to $ 5

A sequence for determining whether a given meter reading is min-

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at least equal to 28 and at least 1.28 χ greater than any other count for a particular bill is shown in Figures 4a, 4b and 4c. One Sequence of the type shown in Fig. 4a determines which of the counter readings is the largest. From the sequence of decision blocks 4a it is clear that when point A is reached by the controller, the $ 1 counter reading the greatest is. On the other hand, points B, C, D, E and F each correspond to the largest counts of $ 5, $ 10, $ 20, $ 50, and $ 100. A similar sequence of decisions is necessary if the banknotes are both with their right side up and their top side down.

As shown in Figure 4b, if the controller determines that the $ 1 count is the largest, then it must determine whether the $ 1 count is greater than or equal to 1.28 χ is the next higher count. The sequence shown in Fig. 4b checks whether the $ 1 count is greater than 1.28 χ of the remaining meter readings. In this way, if the answer is yes to every test, and if so the count is at least 28, it is certain that the bill is a $ 1 bill. The ad will then operated to announce the identification of a $ 1 bill. If the $ 1 count is not at least 1.28 χ greater than all other counts, the bill may cannot be identified with sufficient accuracy and the display 34 indicates that the banknote is lit. can be identified.

The ± t Fig. 4b indicated works in the same way Control when the $ 5 ~ count is the largest to get the

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- Meter reading with the $ 1 ™, $ 10, $ 20, $ 50, and $ 100 meter readings Compare »When the $ 5 ™ meter reading at least 1.28 χ larger than the $ 1-, $ 10-, $ 20-, $ 50- and the count is $ 100 and at least equal to 28, the bill is a $ 5 bill and the display becomes 34 show this.

The controller 28 operates in Pig. 4c shown Manner to cause an indication that the bill is a $ 10, $ 20, £ 50 or $ 10Q bill if the corresponding counter reading at least equal to 28 and 1.28 χ greater than the other counter readings for each of them checking banknote is. If the largest count identified by the sequence shown in FIG. 4a is not at least 1.28 χ is greater than the next higher count or not at least equal to 28, the banknote can cannot be identified and display 54 shows this at.

Those skilled in the art will recognize that the sequence of operations of the controller 28 as shown in FIGS. 2, 3 _? 4a, 4b and 4c can be modified somewhat from the type shown in order to achieve the same result with the circuit shown in FIG. The person skilled in the art will also recognize that the currency discriminator according to the invention can easily be implemented by means of a circuit configuration other than that shown in FIG. 1 in order to achieve the same result. Thus, for example a, as described above operate in Fig. 5 system shown in the same manner to the same tests as pre above, although the details of the circuit operation are quite different in Fig. 5 6 ^ez © iste circuit has at least two Lamps

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which are placed in a position to illuminate a banknote 52 when it is in. one by the arrow 54- indicated directions of the lamps 50 moved past will. The light reflected from the banknote 52 is detected by a detector 56, which may include a type 52C solar cell manufactured by Centra-Lab. There is a shield between the lamps 50 and the detector 56 58 is provided which has a centrally located opening 60 through which some of the 'banknote 52 reflected light can pass through. By suitable arrangement of the detector 56, the shield 58 and the banknote 52 and by means of a suitable size of the opening 60, the detector 56 can only point to that of one given I * surface area reflected on the banknote 52 Address the light. As stated earlier, the preferred embodiment of the invention is dimensioned so that a surface area 2 mm wide and 80 mm high is "seen" by the detector 56.

A signal processing circuit 62 is connected to the detector 56 and amplifies the analog signal emitted by it. After amplification, the video signal received by detector 56 is passed through the signal conditioning circuit 62 to a detector circuit 64- for the edge the engraving and given to a sample and hold circuit 66. The detector circuit 64 for the ^ ante of the engraving generates a signal at its output 68 as soon as it has determined that the engraving on the banknote is in view of the detector 56 is located.

The sample and hold circuit 66 is controlled with the aid of a control signal from a logical point in time and control

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circuit 70 set, which is given via a line 72 to the sample and hold circuit 66. if the signal on the sample and hold circuit 66 on the Line 72 appears, the analog signal is stored in sample and hold circuit 66. That in the sampling and hold circuit 66 stored analog signal is from an analog-digital converter 76, which is connected to this is converted into digitized video data, which is transmitted via a line 78 to a peripheral interface circuit 80 are given. When the microprocessor 82 through the logic timing and control circuit 70 is interrupted with the help of an interruption signal, the digital data of the peripheral interface circuit are transmitted to the microprocessor 82, which these stored in a free access memory 84 (RAM).

The microprocessor 82 is controlled by the control information, which is read out in a read-only memory 86 (ROM). The sequence of operations performed by the microprocessor 82 Steps is essentially the same as described above. At the end of a scan the microprocessor 82 of the peripheral interface circuit 80 gives the banknote the identity of the banknote in the form a code indicating their value.

The details of the contents of the read-only memory 86 are shown in the table below, in conjunction with that shown in detail in FIGS. 7-11 Circuit works.

The detector arrangement is shown in detail in FIGS. 6a and 6b. The detector has a pair of parallel spaced bracket members 100, which by an im

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essential flat part 102 are connected. In the middle of the part 102 there is a slot 104- which, as shown in FIG 6 a, forms a narrow rectangular surface area which is arranged between a plurality of lamps 106 which are switched on during operation to illuminate a banknote 108 when they are at the detector is moved past.

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STMT ADR content STMT ADR content STMT ADR content STMT ADR content

1 0000 OF 07 46 005D 59 08 13th 91 00Β3 27 06 136 0OFF 97 ID * 02 2 0001 86 4001 47 005E A6 04 00IA 92 00S5 Al OO 137 0101 D7 IE 18th 3 0003 B7 OF 48 0060 AO 01 0019 93 00Β7 2Ε F6 138 0103 DB IC 4th 0006 86 4002 49 0062 26th 00IA 94 00Β9 20th FO 139 · 0105 99 IB 5 0008 B7 04 50 0064 OD IA 95 OOBB CE 0001 140 0107 97 IB 4002 ί 6th 00OB 86 4003 51 0065 59 08 OF 96 ΟΟΒΞ 96 18th 141 0109 D7 IC FE 7th 00OD B7 00 7F 52 0066 A6 02 OF 97 00C0 44 142 01OB 96 ID 8th 0010 8E 53 0068 AO 01 98 00C1 25th Oil 143 01OD D6 IE 9 0013 4F 0001 54 00 6A 26th 00 99 00C3 08 144 01OF OC 10 0014 CE 00 55 006C OD OA 100 00C4 9C 17th 145 0110 59 11 0017 Ä7 56 006D 59 08 17th 101 00C6 26th 02 146 Olli 49 12th 0019 08 00OF 57 006E A6 00 19th 102 00C8 08 147 0112 OC 13th 00IA 8C F8 58 0070 AO 2601 00 103 00C9 08 148 0113 59 14th 00ID 26th 83FF 59 0072 OD 17th 104 0OCA DF 19th 149 0114 49 15th 00IF CE 13th 60 0074 59 E8 105 0OCC Α6 OO 150 0115 97 ID 16 0022 DF IE 61 0075 53 13th 106 0OCE 08 151 0117 D7 IE 17th 0024 00 15th 62 0076 DE 11 107 0OCF 08 152 0119 DB IC 18th 0027 DF OF 63 0077 7F 0066 108 00D0 8C 00OF 153 OHB 99 IB 19th 0029 DF 0026 64 0079 7F 03 109 0OD3 27 OF 154 011D 97 IB 20th 002B CE 11 65 00 7C 7C 0048 110 00D5 8C 0010 155 011F D7 IC 21st 002E DF 66 007F 96 111 00D8 27 OA 156 0121 96 ID 22nd 0030 OE 16 67 0082 81 112 0ODA 9C 17th 157 0123 D6 IE 23 0031 96 04 68 0084 27 4002 113 0ODC 27 FO 158 0125 OC 24 0033 2 B IF 69 0086 08 0001 114 0ODE Al OO 159 0126 59 25th 0035 81 F8 70 0088 El 17th 115 00EO 2Ε EC 160 0127 49 26th 0037 2D 08 71 0089 26th QQ- 116 00Ε2 20th Ε6 161 0128 DB IC 27 0039 86 4002 72 008B DF 117 00Ε4 DE 17th 162 012Α 99 IB 28 003B B7 16 73 008D DE OOOF
η η «■» 118 00Ε6 Α6 OO 163 012C 97 IB 29 003E 96 04 74 00 8F 6C 119 00Ε8 81 14th 164 012Ε D7 IC 30th 0040 2 B 27 75 0091 DE 120 0OEA 2D 52 165 0130 DE 17th 31 0042 81 F8 76 0093 20th 121 0OEC DE 19th 166 0132 Α6 OO! 32 0044 2D 11 77 0095 DF 122 0OEE Α6 OO 167 0134 91 IB 33 0046 DE 15th 78 0097 DE 123 0OFO 5F 168 0136 2Ε 09 34 0048 9C FC 79 0099 SC 124 0OFl 97 IB 169 0138 26th 04 ι 35 004A 27 80 00 9B 27 125 00F3 D7 IC 170 013Α D6 IC 36 004C 08 11 81 00 9E 7E 126 O0F5 44 171 013C 27 03 37 004D DF OF 82 00AO OF 127 00F6 56 172 013Ε 4F 38 004F DE 83 00A3 4F 128 00F7 44 173 013F 20th 39 0051 08 OF 84 00A4 B7 129 00F8 56 174 0141 96 40 0052 DP OF 85 00A5 CE 130 00F9 44 175 0143 4C 41 0054 C6 OS 86 00A8 DF 131 0OFA 56 176 0144 44 42 0056 A6 06 87 0OAB A6 132 0OFB 44 177 0145 Β7 43 0058 AO 01 88 QQAD 08 133 0OFC 56 178 0148 20th 44 005A 26th 89 0OAF 8C -134 0OFD 44 45 005C OD 90 OGBO 135
λ ι η 0OFE
ρ η η 56

ORIGINAL INSPECTED

Like in Pig. 6a, the detector 110 is arranged on a bracket 112 which is attached to the rear Surface of the part 102 is attached. The detector 110 is, as in Pig. 6a is shown arranged so that light reflected from a banknote 108 through the Passes through slot 104 and hits detector 110, however, no light from lamps 106 can directly strike the detector.

In accordance with the previously described operation of the invention, the microprocessor 82 is the pig. 5 Enter 72 samples of digitized video data for each bill that is scanned. Once this data is in free access memory 84, microprocessor 102 generates 6A x 4-bit correlation numbers. The 4-bit correlation number is formed from four 1-bit differences of the present sample P when it is compared with the penultimate, fourth from last, sixth from last and eighth from last samples. In other words, the sample P is the penultimate sample P _n _p "^ - compared ^it fourth last sample P _n ^, the sixth last sample P _n _g and the last eight sample P _n _o. If the sample P is greater than or equal to the sample P- o, a binary 1 is inserted into the first bit of the 4-bit correlation number. If P is greater than or equal to Ρ _η _Λ, a 1 is set in a second bit of the correlation number. If P _{n is} greater than or equal to P _c , a 1 is inserted in the third bit position of the correlation number. If P is greater than or equal to Pg, a binary 1 is inserted in the fourth bit position of the correlation number.

When all 4-bit correlation numbers have been generated, these with the permanently stored 4-bit reference correlation

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- 2p -

compared numbers indicating the associated elements of each banknote denomination. If a match between the test correlation number and the reference correlation number occurs, a correlation is established between the sample and the reference value, and becomes a correlation count for that bill value carried out. A variety of these tests are done for each sample and they correspond to one Check for each banknote value detected by the device can be, if the banknote is arranged with the right side up, and a corresponding number, when the banknote is placed upside down.

When the correlation number of the last sample is generated and compared with the corresponding reference correlation numbers vnirde, the microprocessor determines the bill value based on the following two criteria. When the ratio of the highest banknote count to the next highest If the banknote count is equal to or greater than 1.28, then the banknote value can only be that of the highest Correspond to the meter reading. If this ratio is less than 1.28, the bill is classified as unknown. The second criterion is that the bill value count is the largest must be equal to or greater than 28 for the checked banknote. If both criteria are met, actuated the microprocessor 82 the peripheral interface circuit 80, to deliver a code identifying the value on the line shown.

7 to 11 show in detail a device according to the invention, all types of circuit with their parameter values or their customary name only

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are given for better understanding, but this does not limit the invention to these particular ones Components means.

Those skilled in the art will immediately recognize that the foregoing description of preferred embodiments of the invention served only for explanation and that other configurations can easily be specified without, however, thereby would leave the general inventive concept as outlined in the following claims is.

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Claims (7)

PAT ε.ΜΤΑΝ WA LT! Ξ 2935888 THE PERKIN-ELMER CORPORATION Main avenue Norwalk, Connecticut 06856 UNITED STATES. A. GRUNECKER DtPL-ING. H. KINKELDEY DR -IN O. W. STOCKMAIR Da-ING - AoE (CALTECH) K. SCHUMANN 0 «PSa NAT ■ DIPL-FHYa P. H. JAKOB G. BE2OLD 8 MUNICH 22 MAXIMILIANSTRASSE 43 P 14-172 Method and device for identifying the
Fourth of a banknote Claims before Method for identifying the value of a bank note or the like., Characterized by the combination of the following process steps: Directing a beam of light onto a surface of the bank note, 030021/0588 TELEPHONE (Ο89) 22 38 82 TELEX O5-39 3B0 TELEGRAMS MONAPAT TELEKOi = IERER 2935868 Measure the reflectance of light from a variety of incremental areas over the length of the Banknote are distributed, Compare the reflectance of light from each incremental area to the reflectance from each a selected variety of other incremental parts ÜAreas selected in a preselected sequence and generating one based on the comparison one each surface area based first correlation signal and Comparing the first correlation signal with second reference correlation signals each identifiable Value to determine the value of the banknote. 2. The method according to claim 1, characterized in that that one on the degree of correlation between the first correlation signals and the second Reference correlation signals responsive third signal is generated and that the third signal with a preselected Reference value is compared in order to determine the reliability of the determination of the value of the bank note. 3. The method according to claim 2, characterized in that that when the third signal is generated, a banknote value count is carried out if the first correlation signals the two reference correlation signals and that after the banknote value counts have been counted to their maximum possible value for the banknote to be identified is the banknote value counter and is determined and output that is at least equal to 28 and at least 1.28 χ greater than the next larger 030021/0588 Banknote value counter reading is. 4. The method according to any one of claims 1 to J, d adurch marked that "when comparing the Eef lesson of the light from each incremental Area with the eef lesson of each of a preselected multitude of other incremental areas, which are chosen in a preselected sequence, and in generating one based on the comparison of each Area-based first correlation signal a binary first correlation signal with a binary 1 is generated for each comparison in which the light reflected from the incremental area is greater or is equal to the light reflected from a previous incremental area, and with a binary 0 for any comparison in which the light reflected from an incremental area is less than the light reflected from a previous incremental area. 5. The method according to claim 4, characterized in that the preceding incremental surface areas are the penultimate, fourth from last, sixth from last and eighth last incremental surface areas. _v 6. Device for carrying out the method according to one of the preceding claims. 7. Device for identifying the value of a Banknote characterized by the following combination: 030021/0588 Means (14-) for generating a signal P _n , the magnitude of which is proportional to the reflection of light from an area of a bank note, means (24-) for storing a representation of the reflection of the light from each of a plurality of different areas of the banknote, means (28, 33) for forming a plurality of multi-bit correlation numbers N, the first bit of each number being a 1 if P> P _n _p, while otherwise it is a 0, the second bit being a each number is a 1, when P_ y P,., while otherwise, the second bit is 0, the third bit of each number is a 1, if P> P _n _g, while otherwise the third bit is a 0, and the fourth bit of each number is a 1 if P _n ^ ^- ^ _n _g, while otherwise the fourth bit is a 0, where P _{n is} the stored representation of the reflection of light from a given area, P _n _p ^ ^e stored Rendering for the reflection of the light from the vo The last given surface area, P _n ^ the stored reproduction for the reflection of the light from a fourth from the last given surface area and P _n _g the saved reproduction for the reflection. of the light from the last sixth predetermined surface area and P _n _s ^d ^ ^e S ^es P ^{e: i} - ^c kerte rendering for the reflection of the light from the last eighth predetermined surface area are a device (30) for comparing each multi-bit correlation number η with a multi-bit number which corresponds to the same four-bit number which is derived from a sample bank note for each value of the bank note detected by the device, and in the event of a positive comparison a bank note value count is carried out for the assigned bank note value, and means (32) for generating an identity signal which correlates with the identified bill value 030021/0588 2935868 is when the banknote denomination counting for this banknote denomination at least equal to 28 and at least 1.28 χ greater than any other bill denomination count is. 030021/0588