CN210515443U - Analog-digital conversion circuit for realizing multiplexing of false distinguishing signals of paper money - Google Patents
Analog-digital conversion circuit for realizing multiplexing of false distinguishing signals of paper money Download PDFInfo
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- CN210515443U CN210515443U CN201921653089.6U CN201921653089U CN210515443U CN 210515443 U CN210515443 U CN 210515443U CN 201921653089 U CN201921653089 U CN 201921653089U CN 210515443 U CN210515443 U CN 210515443U
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Abstract
The utility model discloses an analog-digital conversion circuit for realizing the paper money counterfeit signal discrimination multiplexing, wherein a signal acquisition circuit, a FPGA circuit, a switch circuit, an analog-digital signal conversion circuit and a signal processing circuit of the circuit are sequentially connected; the signal acquisition circuit is used for acquiring magnetic signals and thickness signals of paper money and sending the magnetic signals and the thickness signals to the FPGA circuit; the switch circuit receives the control signal output by the FPGA circuit and performs gating switching of the magnetic signal and the thickness signal; the analog signal output by the switch circuit is converted into a digital signal through the analog-digital signal conversion circuit, and the digital signal is input to the signal processing circuit to identify the authenticity of the paper money. Adopt the utility model discloses, can realize the function of the multiplexing a slice ADC chip of two kinds of analog signal for the design is simple convenient, saves cost and printing board space.
Description
Technical Field
The utility model relates to a signal multiplexing field especially relates to a realize multiplexing analog-digital conversion circuit of paper currency false distinguishing signal.
Background
In the ATM equipment, various signals of paper money need to be collected for identifying the authenticity of the paper money. The collected signals are analog signals, and the analog signals are converted into digital signals through an analog-to-digital signal converter (ADC) and sent to a signal processor (DSP) for processing so as to achieve the purpose of authenticity identification. Because the variety of counterfeit identification characteristic signals on paper money is various, the existing general design mostly adopts an ADC chip to convert each signal, and the design can increase the cost of products and the complexity of the design.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model aims at providing a realize the multiplexing analog-to-digital conversion circuit of paper currency false distinguishing signal can realize the function of the multiplexing a slice ADC chip of two kinds of analog signals for it is simple convenient to design, saves cost and printing board space.
Based on this, the utility model provides a realize the multiplexing analog-digital conversion circuit of paper currency false distinguishing signal, the circuit includes:
the signal acquisition circuit, the FPGA circuit, the switch circuit, the analog-to-digital signal conversion circuit and the signal processing circuit are sequentially connected;
the signal acquisition circuit is used for acquiring magnetic signals and thickness signals of paper money and sending the magnetic signals and the thickness signals to the FPGA circuit;
the switch circuit receives the control signal output by the FPGA circuit and performs gating switching of the magnetic signal and the thickness signal;
the analog signal output by the switch circuit is converted into a digital signal through the analog-digital signal conversion circuit, and the digital signal is input to the signal processing circuit to identify the authenticity of the paper money.
Wherein, the signal acquisition circuit includes:
the thickness sensor comprises a thickness shaft, a thickness sensing chip and a magnetic head sensor;
the thickness shaft is connected with the thickness induction chip.
Wherein, the acquisition process of the thickness signal comprises the following steps: when the paper money passes through the thickness shaft, the gap size of the thickness shaft is changed, and the thickness induction chip is caused to generate different direct current level signals;
wherein, the acquisition process of the magnetic signal comprises the following steps: the paper money passes through the magnetic head sensor, and magnetic signals of the magnetized area on the paper money are obtained by the magnetic head in an induction mode.
The switching circuit comprises a plurality of chips with the models of CD 4051B.
The analog-to-digital signal conversion circuit comprises a chip with the model number of AD 7934.
The control signals output by the FPGA circuit comprise three control signals.
Wherein the signal processing circuit comprises a DSP processor.
After the signal acquisition circuit acquires the magnetic signal and the thickness signal of the paper money, the signal acquisition circuit filters the magnetic signal and the thickness signal of the paper money through a signal filter.
The circuit further comprises an alarm circuit, and the alarm circuit is connected with the signal processing circuit and used for giving an alarm when the paper money identified by the signal processing circuit is counterfeit money.
The signal acquisition circuit, the FPGA circuit, the switch circuit, the analog-digital signal conversion circuit and the signal processing circuit of the utility model are connected in sequence; the signal acquisition circuit is used for acquiring magnetic signals and thickness signals of paper money and sending the magnetic signals and the thickness signals to the FPGA circuit; the switch circuit receives the control signal output by the FPGA circuit and performs gating switching of the magnetic signal and the thickness signal; the analog signal output by the switch circuit is converted into a digital signal through the analog-digital signal conversion circuit, and the digital signal is input to the signal processing circuit to identify the authenticity of the paper money. The utility model discloses using this simple circuit of switch circuit, coming the speed that cooperates signal acquisition through FPGA control switch's gating frequency, fine realization multiple analog signal multiplexing a slice analog-to-digital signal conversion chip, solved traditional application, an analog signal uses the problem of a slice analog-to-digital conversion chip, has good practicality, has simplified circuit design, has reached and has saved the product cost, saves the effect in printing board space.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of an analog-to-digital conversion circuit for realizing multiplexing of counterfeit paper money discrimination signals according to an embodiment of the present invention;
fig. 2 is a switch circuit diagram of an analog-digital conversion circuit for realizing the multiplexing of the counterfeit paper money discrimination signals provided by the embodiment of the present invention;
fig. 3 is an analog-to-digital conversion circuit diagram of an analog-to-digital conversion circuit for realizing banknote counterfeit detection signal multiplexing according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a schematic diagram of an analog-digital conversion circuit for realizing multiplexing of counterfeit paper money discrimination signals provided by the embodiment of the present invention, the circuit includes:
the signal acquisition circuit, the FPGA circuit, the switch circuit, the analog-to-digital signal conversion circuit and the signal processing circuit are sequentially connected;
the signal acquisition circuit is used for acquiring magnetic signals and thickness signals of paper money and sending the magnetic signals and the thickness signals to the FPGA circuit;
the switch circuit receives the control signal output by the FPGA circuit and performs gating switching of the magnetic signal and the thickness signal;
the analog signal output by the switch circuit is converted into a digital signal through the analog-digital signal conversion circuit, and the digital signal is input to the signal processing circuit to identify the authenticity of the paper money.
The signal acquisition circuit includes:
the thickness sensor comprises a thickness shaft, a thickness sensing chip and a magnetic head sensor;
the thickness shaft is connected with the thickness induction chip.
The thickness signal acquisition process comprises the following steps: when the paper money passes through the thickness shaft, the gap size of the thickness shaft is changed, and the thickness induction chip is caused to generate different direct current level signals;
the acquisition process of the magnetic signals comprises the following steps: the paper money passes through the magnetic head sensor, and magnetic signals of the magnetized area on the paper money are obtained by the magnetic head in an induction mode.
The switching circuit comprises a plurality of chips with the model number of CD 4051B.
The analog-to-digital signal conversion circuit comprises a chip with the model number AD 7934.
The control signals output by the FPGA circuit comprise three control signals.
The signal processing circuit includes a DSP processor.
After the signal acquisition circuit acquires the magnetic signal and the thickness signal of the paper money, the signal acquisition circuit filters the magnetic signal and the thickness signal of the paper money through a signal filter.
The circuit also comprises an alarm circuit, and the alarm circuit is connected with the signal processing circuit and used for giving an alarm when the paper money identified by the signal processing circuit is counterfeit money.
The utility model discloses using this simple circuit of switch circuit, coming the speed that cooperates signal acquisition through FPGA control switch's gating frequency, fine realization multiple analog signal multiplexing a slice analog-to-digital signal conversion chip, solved traditional application, an analog signal uses the problem of a slice analog-to-digital conversion chip, has good practicality, has simplified circuit design, has reached and has saved the product cost, saves the effect in printing board space.
Fig. 2 is a switch circuit diagram of an analog-digital conversion circuit for realizing the banknote counterfeit detection signal multiplexing according to an embodiment of the present invention.
The CD4051B is used as an electronic switch circuit, the chip has eight input channels IN common, and one common output end, namely input by CH0_ IN/OUT-CH 7_ IN/OUT, is gated to COM _ IN/OUT output by A, B, C three control signals. The gating relationship is as follows:
Table 1.Truth Table(1l
A. b, C three switch control signals are all given by FPGA, it needs to be noted that the frequency of switch switching needs to be set in coordination with the thickness and the acquisition frequency of magnetic signals. The utility model discloses the magnetism of paper currency identification signal and thickness signal gather 29 way these signals altogether and all are the key characteristic point of distinguishing the paper currency true and false.
And (3) thickness signals are acquired, the paper money enables the size of the gap of the thickness shaft to change through the thickness shaft, meanwhile, the output level of the thickness sensing chip is caused to change (the thickness sensing chip senses the change of the gap of the thickness shaft to generate different direct current level signals), and the direct current level signals are sent to the FPGA to finish the acquisition of the thickness signals.
And (3) acquiring magnetic signals, namely, when the paper money passes through the magnetic head sensor, the magnetic signals of the magnetized area on the paper money can be sensed, and the magnetic head sensor acquires and transmits the magnetic signals to the FPGA to finish the acquisition of the magnetic signals.
The two signals are switched by using a CD4051B switch, each CD4051B can support 8-way signal input switching, and one common end is output. Therefore, the 29 input signals in the present invention need to be switched by four CD 4051B.
The analog signal after passing through the electronic switch is input to an analog-to-digital signal conversion circuit for analog-to-digital signal conversion, as shown in fig. 3:
t _ M _ IN 0-T _ M _ IN3 are inputted as four analog signals, and are converted into 12-bit digital signals by AD 7934. Four paths of signals are input at each moment until all 29 paths of signals are input into the ADC chip, and the thickness and magnetic signal acquisition of one paper money is completed. The four analog signals include both the thickness signal and the magnetic signal of the paper money. Transmitting the 12bit digital signal to a processor at the rear end for signal processing
The AD7934 transmits the thickness and the magnetic signals to an FPGA circuit end, the FPGA circuit splices the xx-path thickness signals and the xx-path magnetic signals together to form a data packet completely containing the paper money identification characteristics, and then the data packet is sent to a DSP circuit. And analyzing the data such as thickness, magnetism and the like sent by the FPGA into characteristic quantities corresponding to different versions and denominations at the DSP terminal. For example, different versions of different denominations of magnetic signals may be resolved into corresponding magnetic encodings. Similarly, the thickness can be analyzed to obtain the corresponding characteristic quantity. The characteristic quantities of each anti-counterfeiting point of the genuine currency are obtained by collecting and learning a large number of genuine currency samples, and the genuine currency characteristic quantities are stored in the DSP. And comparing the characteristic quantity of the analyzed data of the DSP with the characteristic quantity of the true coin obtained by machine learning stored in the DSP through an algorithm, and judging the true coin if the threshold value of the similarity of the true coin set by the algorithm can be reached, or judging the true coin if the threshold value of the similarity of the true coin is not reached, or judging the false coin.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (10)
1. An analog-digital conversion circuit for realizing multiplexing of false distinguishing signals of paper money is characterized by comprising:
the signal acquisition circuit, the FPGA circuit, the switch circuit, the analog-to-digital signal conversion circuit and the signal processing circuit are sequentially connected;
the signal acquisition circuit is used for acquiring magnetic signals and thickness signals of paper money and sending the magnetic signals and the thickness signals to the FPGA circuit;
the switch circuit receives the control signal output by the FPGA circuit and performs gating switching of the magnetic signal and the thickness signal;
the analog signal output by the switch circuit is converted into a digital signal through the analog-digital signal conversion circuit, and the digital signal is input to the signal processing circuit to identify the authenticity of the paper money.
2. The multiplexing analog-digital conversion circuit for realizing the paper currency counterfeit detection signal according to claim 1, wherein the signal acquisition circuit comprises:
the thickness sensor comprises a thickness shaft, a thickness sensing chip and a magnetic head sensor;
the thickness shaft is connected with the thickness induction chip.
3. The analog-digital conversion circuit for realizing the multiplexing of the paper money counterfeit detection signal according to claim 2, wherein the thickness signal acquisition process comprises the following steps: when the paper money passes through the thickness shaft, the gap size of the thickness shaft is changed, and the thickness induction chip is caused to generate different direct current level signals.
4. The analog-digital conversion circuit for realizing the multiplexing of the paper currency counterfeit detection signals as claimed in claim 2, wherein the collection process of the magnetic signals comprises the following steps: the paper money passes through the magnetic head sensor, and magnetic signals of the magnetized area on the paper money are obtained by the magnetic head in an induction mode.
5. The analog-digital conversion circuit for realizing the multiplexing of the paper currency counterfeit detection signal as claimed in claim 1, wherein the switch circuit comprises a plurality of chips with the type of CD 4051B.
6. The analog-digital conversion circuit for realizing the multiplexing of the paper money counterfeit detection signals as claimed in claim 1, wherein the analog-digital signal conversion circuit comprises a chip with model number AD 7934.
7. The multiplexing analog-digital conversion circuit for realizing the paper currency counterfeit detection signal according to claim 1, wherein the control signal output by the FPGA circuit comprises three control signals.
8. The multiplexing analog-to-digital conversion circuit for realizing the paper currency counterfeit detection signal according to claim 1, wherein the signal processing circuit comprises a DSP processor.
9. The analog-digital conversion circuit for realizing the multiplexing of the counterfeit detection signals of the paper money according to claim 1, wherein after the signal acquisition circuit acquires the magnetic signals and the thickness signals of the paper money, the analog-digital conversion circuit further filters the magnetic signals and the thickness signals of the paper money through a signal filter.
10. The multiplexing analog-digital conversion circuit for realizing the paper currency discrimination signal as claimed in claim 1, wherein the circuit further comprises an alarm circuit, the alarm circuit is connected with the signal processing circuit and is used for alarming when the paper currency recognized by the signal processing circuit is a counterfeit currency.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921653089.6U CN210515443U (en) | 2019-09-29 | 2019-09-29 | Analog-digital conversion circuit for realizing multiplexing of false distinguishing signals of paper money |
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| CN201921653089.6U CN210515443U (en) | 2019-09-29 | 2019-09-29 | Analog-digital conversion circuit for realizing multiplexing of false distinguishing signals of paper money |
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