CN107944314B - Magnetic stripe decoding method and system - Google Patents
Magnetic stripe decoding method and system Download PDFInfo
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- CN107944314B CN107944314B CN201711339002.3A CN201711339002A CN107944314B CN 107944314 B CN107944314 B CN 107944314B CN 201711339002 A CN201711339002 A CN 201711339002A CN 107944314 B CN107944314 B CN 107944314B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
Abstract
The application discloses a magnetic stripe decoding method, which comprises the following steps: acquiring an original signal and a user decoding mode of a magnetic stripe; when the user decoding mode is a software decoding mode, decoding the original signal through the software decoding mode; wherein the specific process of decoding the original signal by the software decoding mode includes: carrying out amplitude limiting amplification on the original signal by a preset multiple through PGA to obtain an amplitude limiting amplified signal; sampling the amplitude limiting amplification signal through an ADC (analog to digital converter) to obtain a sampled digital signal; and decoding the digital signal through a decoding software program of the CPU. The invention obtains digital signals after passing through PGA and ADC, and decodes the digital signals by using a decoding software program, wherein the decoding process is completed by software, and the invention has strong anti-interference capability, high compatibility and high card swiping success rate. The application also correspondingly discloses a magnetic stripe decoding system.
Description
Technical Field
The invention relates to the technical field of information identification, in particular to a magnetic stripe decoding method and a magnetic stripe decoding system.
Background
The magnetic stripe card is an identification card made of magnetic substance, and has wide application field, and can be made into bank card, membership card, road payment card, etc. The magnetic stripe card is generally made of polyvinyl chloride, polyvinyl chloride film or composite paper on the front side and is adhered with a magnetic stripe having one or more magnetic tracks on the back side.
The information in the magnetic stripe card must be read and decoded by a magnetic stripe card swiping terminal, and the swiping terminal is usually composed of a magnetic head, a decoding system, an encryption and decryption system and a communication control system. The invention discloses a circuit implementation scheme for realizing multi-mode magnetic stripe decoding based on a single module, which is an implementation scheme of a decoding system.
The information in the magnetic stripe card is recorded in the direction of magnetic domains in the magnetic stripe and is encoded in an F2F encoding format, namely in a period T, if N-N or S-S occurs, the information is logic 1; if the signal does not appear in the period T, the signal is marked as logic 0. When the card is swiped, because of the difference of the magnetic domain directions in the magnetic stripe, an induced current can be generated on the magnetic head according to the lenz theorem, and when the magnetic head induces N-N or S-S, a current pulse can be generated, as shown in the signal waveform in fig. 1.
When the magnetic stripe card is used, information stored in a magnetic track is read by a magnetic head to generate an original F2F coding signal, because the amplitude of the signal is several mV to dozens of mV, the signal needs to be preprocessed by a magnetic head signal preprocessing circuit, and after the signal is processed, the signal is sent to a decoding controller or a decoding program for decoding, and finally data transmission is carried out with a CPU through a bus.
In the prior art, although different IC manufacturers have different head signal preprocessing, decoding control circuits and decoding programs, a hardware decoding scheme is generally adopted. The software program of the scheme is simple, but the anti-interference capability is poor; one fixed hardware decoding scheme can only decode fixed magnetic stripe card types, and compatibility is poor; moreover, the card swiping success rate is low, and the possibility of information reading error or failure exists.
Disclosure of Invention
In view of the above, the present invention provides a magnetic stripe decoding method and system with strong anti-interference capability and high card-swiping success rate. The specific scheme is as follows:
a magnetic stripe decoding method, comprising:
acquiring an original signal and a user decoding mode of a magnetic stripe;
when the user decoding mode is a software decoding mode, decoding the original signal through the software decoding mode;
wherein the specific process of decoding the original signal by the software decoding mode includes:
carrying out amplitude limiting amplification on the original signal by a preset multiple through PGA to obtain an amplitude limiting amplified signal;
sampling the amplitude limiting amplification signal through an ADC (analog to digital converter) to obtain a sampled digital signal;
and decoding the digital signal through a decoding software program of the CPU.
Preferably, the process of performing amplitude limiting amplification on the original signal by a preset multiple through the PGA to obtain an amplitude-limited amplified signal includes:
and carrying out amplitude limiting amplification on the original signal by a preset multiple through the PGA comprising a clamp circuit to obtain the amplitude limiting amplified signal.
Preferably, before the process of performing amplitude limiting and amplification on the original signal by a preset multiple through the PGA, the method further includes:
and adjusting the preset multiple through the CPU.
Preferably, the process of decoding the digital signal by the decoding software program of the CPU specifically includes:
judging whether the digital signal comprises 1 or not in a preset period;
if yes, judging as logic 1; if not, a logic 0 is determined.
Preferably, the magnetic stripe decoding method further comprises:
when the user decoding mode is a hardware decoding mode, decoding the original signal through the hardware decoding mode;
wherein the specific process of decoding the original signal in the hardware decoding mode includes:
amplifying the original signal by the PGA according to the preset times to obtain an amplified signal;
the first comparator group carries out signal amplitude interval judgment on the amplified signal to obtain an interval judgment signal;
the second comparator group carries out digital processing on the amplified signal, and two paths of unilateral digital pulse signals are obtained according to the wave crest and the wave trough of the amplified signal;
and the decoding controller decodes the two unilateral digital pulse signals and adjusts the preset multiple according to the interval judgment signal.
Preferably, the process of decoding the two paths of unilateral digital signals by the decoding controller specifically includes:
judging whether the two paths of unilateral digital signals comprise 1 or not in a preset period;
if any one of the two unilateral digital signals comprises 1, judging the unilateral digital signal to be logic 1;
and if the two single-side digital signals do not comprise 1, judging that the single-side digital signals are logic 0.
Correspondingly, the invention also discloses a magnetic stripe decoding system, which comprises:
the data acquisition port is used for acquiring an original signal of the magnetic stripe and a user decoding mode;
the software decoding module is used for decoding the original signal through the software decoding mode when the user decoding mode is the software decoding mode;
wherein, the software decoding module specifically comprises:
the PGA is used for carrying out amplitude limiting amplification on the original signal by a preset multiple when the user decoding mode is a software decoding mode to obtain an amplitude limiting amplification signal;
the ADC is used for sampling the amplitude limiting amplification signal when the user decoding mode is the software decoding mode to obtain a sampled digital signal;
and the CPU is used for decoding the digital signal through a decoding software program when the user decoding mode is the software decoding mode.
Preferably, the PGA includes:
a clamp circuit for clipping when the PGA amplifies the original signal.
Preferably, the CPU is further configured to:
and controlling the preset multiple.
Preferably, the magnetic stripe decoding system further comprises a hardware decoding module, configured to decode the original signal in the hardware decoding mode when the user decoding mode is the hardware decoding mode;
wherein, the hardware decoding module specifically comprises:
the PGA is configured to amplify the original signal by the preset multiple to obtain an amplified signal when the user decoding mode is the hardware decoding mode;
a first comparator set, configured to perform signal amplitude interval decision on the amplified signal to obtain an interval decision signal when the user decoding mode is the hardware decoding mode;
the second comparator group is used for carrying out digital processing on the adjusted signal when the user decoding mode is the hardware decoding mode, and obtaining two paths of unilateral digital pulse signals according to the wave crest and the wave trough of the amplified signal;
and the decoding controller is used for decoding the two paths of unilateral digital pulse signals when the user decoding mode is the hardware decoding mode, and adjusting the preset multiple according to the interval judgment signal.
The invention discloses a magnetic stripe decoding method, which comprises the following steps: acquiring an original signal and a user decoding mode of a magnetic stripe; when the user decoding mode is a software decoding mode, decoding the original signal through the software decoding mode; wherein the specific process of decoding the original signal by the software decoding mode includes: carrying out amplitude limiting amplification on the original signal by a preset multiple through PGA to obtain an amplitude limiting amplified signal; sampling the amplitude limiting amplification signal through an ADC (analog to digital converter) to obtain a sampled digital signal; and decoding the digital signal through a decoding software program of the CPU. The invention obtains the digital signal corresponding to the original signal after passing through the PGA and the ADC, and decodes the digital signal by utilizing a decoding software program, wherein the decoding process is completed by software, and the invention has strong anti-interference capability, high compatibility and high card swiping success rate.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the original F2F signal output during reading of a magnetic stripe card by a magnetic head;
FIG. 2 is a flowchart illustrating steps of a magnetic stripe decoding method according to an embodiment of the present invention;
FIG. 3 is a diagram of the connection of a clamp circuit in a PGA according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating the sub-steps of a particular magnetic stripe decoding method in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of F2F decoding according to a specific magnetic stripe decoding method in an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a magnetic stripe decoding system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a magnetic stripe decoding method, which is shown in figure 2 and comprises the following steps:
s1: acquiring an original signal and a user decoding mode of a magnetic stripe;
s2: when the user decoding mode is a software decoding mode, decoding the original signal through the software decoding mode;
wherein the specific process of decoding the original signal by the software decoding mode includes:
s21: performing amplitude limiting amplification on the original signal by preset times through a Programmable Gain Amplifier (PGA) to obtain an amplitude limiting amplified signal;
wherein the preset multiple can be adjusted by the CPU.
Specifically, because the original signal amplitude is irregular, if the original signal amplitude is amplified according to a preset multiple, the voltage amplitude is easily larger than VCC or GND, clipping distortion occurs in the output waveform, which may cause loss of the signal period T of the original signal, resulting in subsequent decoding errors. Therefore, a clamp circuit can be added to the PGA, and the wiring diagram of the clamp circuit in the PGA is shown in fig. 3. When the output voltage of the signal amplifier greatly exceeds the preset maximum voltage value, the clamp circuit can pull down the amplitude of the output signal, so that the output signal is kept at the maximum voltage value; when the output of the signal amplifier is close to 0, the clamp circuit can pull up the amplitude of the output signal to ensure that the output signal is within the identification range of an ADC (Analog-to-Digital Converter). Therefore, the original signal can be amplitude-limited and amplified by the preset times through the PGA comprising the clamp circuit, so that an amplitude-limited and amplified signal is obtained, and the amplified signal after amplitude limitation is easier to obtain and is not easy to lose.
S22: sampling the amplitude limiting amplification signal through an ADC (analog to digital converter) to obtain a sampled digital signal;
it can be understood that the ADC samples the amplitude-limited amplified signal output by the PGA at a certain conversion speed, and sends the peak and valley signals of the sampled amplified signal to the CPU in the form of a digital signal.
S23: and decoding the digital signal through a decoding software program of the CPU.
A software program in the CPU automatically identifies a digitized F2F waveform according to a digital signal, and decodes the waveform according to a specific algorithm, for example, in a preset period, to determine whether the digital signal includes 1; if yes, judging as logic 1; if not, a logic 0 is determined. Of course, the decoding algorithm used by the software program is not limited, and other decoding algorithms may be designed.
It can be understood that the software design is more complex, the card swiping success rate is higher, the safety is also ensured, the software program is easier to write and modify, the compatibility is higher, and the method is suitable for users with high-end complex requirements.
The invention discloses a magnetic stripe decoding method, which comprises the following steps: acquiring an original signal and a user decoding mode of a magnetic stripe; when the user decoding mode is a software decoding mode, decoding the original signal through the software decoding mode; wherein the specific process of decoding the original signal by the software decoding mode includes: carrying out amplitude limiting amplification on the original signal by a preset multiple through PGA to obtain an amplitude limiting amplified signal; sampling the amplitude limiting amplification signal through an ADC (analog to digital converter) to obtain a sampled digital signal; and decoding the digital signal through a decoding software program of the CPU. The invention obtains the digital signal corresponding to the original signal after passing through the PGA and the ADC, and decodes the digital signal by utilizing a decoding software program, wherein the decoding process is completed by software, and the invention has strong anti-interference capability, high compatibility and high card swiping success rate.
The embodiment of the invention discloses a specific magnetic stripe decoding method, and compared with the previous embodiment, the technical scheme is further explained and optimized in the embodiment. Specifically, the method comprises the following steps:
the magnetic stripe decoding method further comprises the following steps:
s3: when the user decoding mode is a hardware decoding mode, decoding the original signal through the hardware decoding mode;
the specific process of decoding the original signal in the hardware decoding mode is shown in fig. 4, and includes:
s31: amplifying the original signal by the PGA according to the preset times to obtain an amplified signal;
s32: the first comparator group carries out signal amplitude interval judgment on the amplified signal to obtain an interval judgment signal;
it can be easily seen that S31 is similar to S21. However, unlike the software decoding mode, the hardware decoding mode of the present invention does not use a clamp circuit for clipping, but uses a comparator bank to automatically adjust the amplified signal.
S33: the second comparator group carries out digital processing on the amplified signal, and two paths of unilateral digital pulse signals voutp and voutn are obtained according to the wave crest and the wave trough of the amplified signal;
s34: and the decoding controller decodes the two paths of unilateral digital signals voutp and voutn and adjusts the preset multiple according to the interval judgment signal.
The specific decoding algorithm is as follows: judging whether the two paths of unilateral digital signals comprise 1 or not in a preset period; if any one of the two unilateral digital signals comprises 1, judging the unilateral digital signal to be logic 1; and if the two single-side digital signals do not comprise 1, judging that the single-side digital signals are logic 0.
Of course, other decoding algorithms can be selected and implemented by the decoding controller.
It can be understood that, referring to the decoding principle of F2F in fig. 5, the decoding controller adjusts the preset multiple according to the interval decision signal of the present period, and in the next period, the original signal passes through the PGA to obtain the adjusted amplified signal.
It is understood that the decoding controller is connected to the CPU, and finally, the result obtained by decoding by the decoding controller is sent to the CPU. The burden on the CPU is smaller in the hardware decode mode than in the software decode mode.
It can be understood that, compared with the previous embodiment, the present embodiment adds a hardware decoding mode, so that a user can select a user decoding mode according to the level of the user's requirement, thereby obtaining a decoding mode more suitable for the requirement.
Correspondingly, the embodiment of the present invention further discloses a magnetic stripe decoding system, as shown in fig. 6, including:
the data acquisition port 01 is used for acquiring an original signal of a magnetic stripe and a user decoding mode;
the software decoding module 02 is configured to decode the original signal through the software decoding mode when the user decoding mode is the software decoding mode;
wherein, the software decoding module 02 specifically includes:
the PGA11 is used for carrying out amplitude limiting amplification on the original signal by preset times to obtain an amplitude limiting amplified signal;
the ADC12 is used for sampling the amplitude-limited amplified signal when the user decoding mode is a software decoding mode to obtain a sampled digital signal;
a CPU13, configured to decode the digital signal by decoding a software program when the user decoding mode is a software decoding mode.
Further, the PGA11 includes a clamp circuit for clipping when the PGA amplifies the original signal.
It will be appreciated that the clamp circuit is operable to adjust the voltage level of the output signal to be outside or below a set range so that it remains within the range that can be recognized by the ADC 12.
Further, the CPU13 is also configured to control the preset multiple.
It can be understood that the software design is complex, the card swiping success rate is high, the safety is guaranteed, the software program is easy to write and modify, the compatibility is high, and the method is suitable for users with high-end complex requirements.
Further, the magnetic stripe decoding system may further include:
the hardware decoding module 03 is configured to decode the original signal in the hardware decoding mode when the user decoding mode is the hardware decoding mode;
wherein, the hardware decoding module 03 specifically includes:
the PGA11 is configured to, when the user decoding mode is the hardware decoding mode, amplify the original signal by the preset multiple to obtain an amplified signal;
wherein, if the PGA in the original software decoding module further comprises a clamp circuit, the clamp circuit does not work in the hardware decoding mode.
A first comparator group 14, configured to perform signal amplitude interval determination on the amplified signal when the user decoding mode is the hardware decoding mode, to obtain an interval determination signal, and perform automatic adjustment on the amplified signal, to obtain an adjusted signal;
a second comparator group 15, configured to, when the user decoding mode is the hardware decoding mode, perform digital processing on the adjusted signal, and obtain two unilateral digital pulse signals according to a peak and a trough of the amplified signal, so as to obtain two unilateral digital signals corresponding to the peak and the trough of the adjusted signal, respectively;
and a decoding controller 16, configured to decode the two unilateral digital pulse signals when the user decoding mode is the hardware decoding mode, and adjust the preset multiple according to the interval determination signal.
It can be understood that the system can switch between the software decoding mode and the hardware decoding mode according to the user selection of the user decoding mode to meet different requirements of the user.
The embodiment of the invention has the corresponding beneficial effects with the magnetic stripe decoding method in the embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The magnetic stripe decoding method and system provided by the invention are described in detail above, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the above examples is only used for helping understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A magnetic stripe decoding method, comprising:
acquiring an original signal and a user decoding mode of a magnetic stripe;
when the user decoding mode is a software decoding mode, decoding the original signal through the software decoding mode;
wherein the specific process of decoding the original signal by the software decoding mode includes:
adjusting the preset multiple of the PGA through the CPU;
carrying out amplitude limiting amplification on the original signal by the PGA according to the preset times to obtain an amplitude limiting amplified signal;
sampling the amplitude limiting amplification signal through an ADC (analog to digital converter) to obtain a sampled digital signal;
decoding the digital signal by a decoding software program of the CPU;
when the user decoding mode is a hardware decoding mode, decoding the original signal through the hardware decoding mode;
wherein the specific process of decoding the original signal in the hardware decoding mode includes:
amplifying the original signal by the PGA according to the preset times to obtain an amplified signal;
the first comparator group carries out signal amplitude interval judgment on the amplified signal to obtain an interval judgment signal;
the second comparator group carries out digital processing on the amplified signal, and two paths of unilateral digital pulse signals are obtained according to the wave crest and the wave trough of the amplified signal;
and the decoding controller decodes the two unilateral digital pulse signals, sends the decoded result to the CPU, and adjusts the preset multiple according to the interval judgment signal.
2. The magnetic stripe decoding method of claim 1, wherein the process of performing amplitude-limited amplification on the original signal by preset times through PGA to obtain an amplitude-limited amplified signal comprises:
and carrying out amplitude limiting amplification on the original signal by a preset multiple through the PGA comprising a clamp circuit to obtain the amplitude limiting amplified signal.
3. The magnetic stripe decoding method of claim 1, wherein the process of decoding the digital signal by a decoding software program of a CPU specifically comprises:
judging whether the digital signal comprises 1 or not in a preset period;
if yes, judging as logic 1; if not, a logic 0 is determined.
4. The magnetic stripe decoding method of claim 1, wherein the process of decoding the two single-sided digital pulse signals by the decoding controller specifically comprises:
judging whether the two unilateral digital pulse signals comprise 1 or not in a preset period;
if any one of the two unilateral digital pulse signals comprises 1, judging the unilateral digital pulse signal to be logic 1;
and if the two unilateral digital pulse signals do not comprise 1, judging that the unilateral digital pulse signals are logic 0.
5. A magnetic stripe decoding system, comprising:
the data acquisition port is used for acquiring an original signal of the magnetic stripe and a user decoding mode;
the software decoding module is used for decoding the original signal through the software decoding mode when the user decoding mode is the software decoding mode;
wherein, the software decoding module specifically comprises:
the PGA is used for carrying out amplitude limiting amplification on the original signal by a preset multiple when the user decoding mode is a software decoding mode to obtain an amplitude limiting amplification signal;
the ADC is used for sampling the amplitude limiting amplification signal when the user decoding mode is the software decoding mode to obtain a sampled digital signal;
the CPU is used for decoding the digital signal through a decoding software program when the user decoding mode is the software decoding mode and is also used for controlling the preset multiple;
the magnetic stripe decoding system also comprises a hardware decoding module used for decoding the original signal through the hardware decoding mode when the user decoding mode is the hardware decoding mode;
wherein, the hardware decoding module specifically comprises:
the PGA is configured to amplify the original signal by the preset multiple to obtain an amplified signal when the user decoding mode is the hardware decoding mode;
a first comparator set, configured to perform signal amplitude interval decision on the amplified signal to obtain an interval decision signal when the user decoding mode is the hardware decoding mode;
the second comparator group is used for carrying out digital processing on the amplified signal when the user decoding mode is the hardware decoding mode, and obtaining two paths of unilateral digital pulse signals according to the wave crest and the wave trough of the amplified signal;
and the decoding controller is used for decoding the two paths of unilateral digital pulse signals when the user decoding mode is the hardware decoding mode, sending a decoded result to the CPU, and adjusting the preset multiple according to the interval judgment signal.
6. A magnetic stripe decoding system according to claim 5 wherein the PGA comprises:
a clamp circuit for clipping when the PGA amplifies the original signal.
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| WO2011047028A2 (en) * | 2009-10-13 | 2011-04-21 | Square, Inc. | Systems and methods for financial transaction through miniaturized card reader |
| KR20130020861A (en) * | 2011-08-19 | 2013-03-04 | 고려대학교 산학협력단 | Software modulation prevention method using own encryption |
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