CN106997443A - Magnetic stripe card coding/decoding method and device - Google Patents
Magnetic stripe card coding/decoding method and device Download PDFInfo
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- CN106997443A CN106997443A CN201710012550.9A CN201710012550A CN106997443A CN 106997443 A CN106997443 A CN 106997443A CN 201710012550 A CN201710012550 A CN 201710012550A CN 106997443 A CN106997443 A CN 106997443A
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- G—PHYSICS
- 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
- G06K7/082—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 using inductive or magnetic sensors
- G06K7/083—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 using inductive or magnetic sensors inductive
- G06K7/084—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 using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
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Abstract
The embodiment of the invention discloses a kind of magnetic stripe card coding/decoding method and device.Method includes：Step S1, the signal for obtaining the magnetic stripe card that magnetic head is read；Step S2, the signal waveform to the signal are analyzed, and obtain the amplitude and WFS of two neighboring zero extreme point；Step S3, according to two neighboring zero extreme point amplitude and WFS obtain position window；Step S4, according to the position window of acquisition the signal is decoded.The embodiment of the present invention is by analyzing signal waveform, adaptively to estimate a window, and the position window based on estimation is decoded, compared with using the scheme of identical bits window in the prior art, can effectively put forward the estimated accuracy of high-window, and then raising is decoded into power.
Description
Technical field
The present embodiments relate to signal processing technology field, and in particular to a kind of magnetic stripe card coding/decoding method and device.
Background technology
The application field of magnetic stripe card is quite varied, can make as bank card, member card, highway paying card etc..It
A kind of tag card being actually made using magnetic material.So-called tag card is exactly that marked holder and publisher's letter
The card of breath.The front of magnetic stripe card is made up of polyvinyl chloride, poly- cruel film or extrusion coating paper, and its reverse side is then one with magnetic stripe
Face, it is indicative that the front that magnetic card is made by magnetic material is typically printed on issuing bank's title, holder name, period of validity etc.
Information, reverse side be typically printed with issuing bank's Service Phone, cardholder signature bar, ard issuers statement etc. information.
In general, the magnetic card used in banking system, the magnetic stripe of its reverse side has 3 independent magnetic tracks, is respectively
Magnetic track 1 (Track1), magnetic track 2 (Track2) and magnetic track 3 (Track3), the distribution of 3 magnetic tracks are as shown in Figure 1.According to different
Application demand, some magnetic cards have only used two of which magnetic track, and current most of magnetic stripe cards have all only used 2,3 magnetic tracks.
Wherein, the width of three magnetic tracks is identical, is 2.80 millimeters, the various data messages for recording user,
About 0.05 millimeter of gap between two adjacent magnetic tracks, for distinguishing two adjacent magnetic tracks, therefore, magnetic stripe it is total
Width is 10.29 millimeters (on condition that magnetic card that 3 magnetic tracks are all used) or is 6.35 millimeters (on condition that using 2
The magnetic card of individual magnetic track).In real life, the width of magnetic stripe can all increase by 1~2 millimeter on bank magnetic stripe card used in us
Left and right, the overall width of magnetic stripe is at 12~13 millimeters.
In general, in the beginning and end of magnetic stripe card it is made up of several bits " 0 ", the number of bit " 0 " is big
More at more than ten or tens, these bits " 0 " are the decodings for being designed specifically to aid in magnetic stripe card, and we play these
Bit " 0 " amplification of beginning, such as Fig. 2 illustrates 8 bits " 0 " most started, and (person of swiping the card is at the uniform velocity preferably swiping the card under state
Swipe the card, this is impossible in practice), each bit " 0 " duration of beginning and end is identical,
The duration that namely Fig. 2 is represented be T, also referred to as position window T, due to sample rate be it is fixed, therefore, each bit " 0 "
The points that waveform is sampled are consistent, and generally we are sampled points come table in decoding algorithm with each bit pattern
Show the duration T of each bit.In magnetic stripe card decoding algorithm, typically carried out using these bits " 0 " for starting of swiping the card
Position window T (being sampled points of the duration of a bit, i.e. each bit pattern) estimation, we are this process
It is referred to as synchronous, only after synchronization, the position window T of estimation is obtained, the search that peak point is searched in decoding process is just can determine that
Window (search halt), also only accurately determines a window T, can accurately decode, therefore the synchronous solution for magnetic stripe card
It is most important for code.
During the embodiment of the present invention is realized, inventor find due to being swiped the card in magnetic stripe card at the beginning of, speed compared with
Low, amplitude is smaller, and is easily interfered, therefore signal to noise ratio is relatively low, in addition, speed of swiping the card can change with gesture, leads
The position window T of these bits " 0 " of the initial segment is caused constantly to change, these factor collective effects together, may result in and estimate
When counting position window T, the degree of accuracy is affected, and directly influences the success rate of decoding.
The content of the invention
One purpose of the embodiment of the present invention is to solve the side that prior art carries out magnetic stripe card decoding using identical bits window
Case, causes a window estimated accuracy low, and then causes and be decoded into the problem of power is low.
The embodiment of the present invention proposes a kind of magnetic stripe card coding/decoding method, including：
Step S1, the signal for obtaining the magnetic stripe card that magnetic head is read；
Step S2, the signal waveform to the signal are analyzed, and obtain the amplitude and ripple of two neighboring zero extreme point
Shape interval；
Step S3, according to two neighboring zero extreme point amplitude and WFS obtain position window；
Step S4, decoded according to the position window correspondence signal of acquisition.
Optionally, the step S2 is specifically included：
Signal waveform to the signal carries out the data origination that analysis obtains the signal；
First positive peak point, the first negative peak point, the second positive peak point, the are obtained according to the data origination of the signal
2 negative peak points, the 3rd positive peak point ..., N positive peaks point, the range value of N negative peaks point；
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd posivtive spike
Value point ..., N positive peaks point, the range value of N negative peaks point, obtain the absolute value of each range value.
Optionally, the step S2 is specifically included：
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd posivtive spike
Value point ..., N positive peaks point, the position of N negative peaks point obtain peak-to-valley value interval and paddy peak intervals；
The first positive peak mesial point corresponding with the first positive peak point is obtained according to the amplitude of the first positive peak point
Position and the first negative peak mesial point position；
According to the first positive peak point amplitude and the amplitude of the first negative peak point obtain the second negative peak mesial point position and
Second positive peak mesial point position；
The is obtained according to the first positive peak point amplitude, the amplitude of the first negative peak point and the second positive peak point amplitude
Three positive peak mesial point positions and the 3rd negative peak mesial point position；By that analogy, each positive peak mesial point position and minus half peak value are obtained
The position of point；
Positive half value point interval is obtained according to the positive peak mesial point position；Born according to the negative peak mesial point position
Half value point interval.
Optionally, the step S2 is specifically included：
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd posivtive spike
Value point ..., N positive peaks point, the position of N negative peaks point obtain peak-to-valley value interval and paddy peak intervals；
The first negative peak mesial point corresponding with the first negative peak point is obtained according to the amplitude of the first negative peak point
Position and the first positive peak mesial point position；
According to the first negative peak point amplitude and the amplitude of the first positive peak point obtain the second negative peak mesial point position and
Second positive peak mesial point position；According to the first negative peak point amplitude, the amplitude of the first positive peak point and the second negative peak point
Amplitude obtain the 3rd positive peak mesial point position and the 3rd negative peak mesial point position ..., obtain the positive peak mesial point positions of N and
N bears peak mesial point position；
Positive half value point interval is obtained according to each positive peak mesial point position；Negative half value is obtained according to each negative peak mesial point position
Point interval.
Optionally, before step S3, methods described also includes：
The first preset requirement criterion whether is met between the absolute value for judging the positive and negative peak point amplitude obtained；
If so, then judging the peak-to-valley value interval, the paddy peak intervals, the positive half value point interval and described negative half
Whether value point interval meets the second preset requirement criterion；
If so, then performing the step S3.
Optionally, the step S3 is specifically included：
The positive half value point interval and described negative half according to the positive half value point interval and the negative half value point interval acquiring
The average at value point interval；
Obtain between the peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and the negative half value point
Every mean of mean；
The peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and described negative half are obtained by described
Value point interval mean of mean round after as position window.
The embodiment of the present invention provides a kind of magnetic stripe card decoding apparatus, including：
Acquisition module, the signal of the magnetic stripe card for obtaining magnetic head reading；
Analysis module, is analyzed for the signal waveform to the signal, obtains the width of two neighboring zero extreme point
Degree and WFS；
Processing module, amplitude and WFS for the extreme point according to two neighboring zero obtain position window；
Decoder module, is decoded for the position window correspondence signal according to acquisition.
Optionally, the analysis module, carries out analysis specifically for the signal waveform to the signal and obtains the signal
Data origination；According to the data origination of the signal obtain the first positive peak point, the first negative peak point, the second positive peak point,
Second negative peak point, the 3rd positive peak point ..., wait N positive peaks point, the range value of N negative peaks point；According to described first
Positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd positive peak point ..., N positive peaks
The range value of point, N negative peaks point, obtains the absolute value of each range value.
Optionally, described device also includes：Judge module；
Whether first is met between the judge module, the absolute value for the positive and negative peak point amplitude for judging to be obtained
Preset requirement criterion；If so, then judging the peak-to-valley value interval, the paddy peak intervals, the positive half value point interval and described
Whether negative half value point interval meets the second preset requirement criterion；If so, then allowing the processing module to bring into operation.
Optionally, the processing module, specifically for being obtained according to the positive half value point interval and the negative half value point interval
Take the average at the positive half value point interval and the negative half value point interval；Obtain the peak-to-valley value interval, the paddy peak intervals
With the mean of mean at the positive half value point interval and the negative half value point interval；By it is described obtain the peak-to-valley value interval,
Conduct after the paddy peak intervals and the mean of mean at the positive half value point interval and the negative half value point interval are rounded
Position window.
As shown from the above technical solution, it is right that a kind of magnetic stripe card coding/decoding method and device that the embodiment of the present invention is proposed pass through
Signal waveform is analyzed, adaptively to estimate a window, and the position window based on estimation is decoded, with adopting in the prior art
Compared with the scheme of identical bits window, can effectively put forward the estimated accuracy of high-window, and then raising is decoded into power.
Brief description of the drawings
The features and advantages of the present invention can be more clearly understood from by reference to accompanying drawing, accompanying drawing is schematical without answering
It is interpreted as carrying out any limitation to the present invention, in the accompanying drawings：
Fig. 1 shows the track profile figure of magnetic stripe card in the prior art；
Fig. 2 shows the position window T that prior art is used when being decoded；
Fig. 3 shows a kind of schematic flow sheet for magnetic stripe card coding/decoding method that one embodiment of the invention is provided；
Fig. 4 is shown in a kind of magnetic stripe card coding/decoding method that one embodiment of the invention is provided with the occasion of for the same of starting point
Walk schematic diagram；
Fig. 5 shows a kind of structural representation for magnetic stripe card decoding apparatus that one embodiment of the invention is provided；
Fig. 6 shows a kind of structural representation for magnetic stripe card decoding apparatus that another embodiment of the present invention is provided.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained on the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
Fig. 3 shows a kind of schematic flow sheet for magnetic stripe card coding/decoding method that one embodiment of the invention is provided, referring to Fig. 3,
This method can be completed by the processor in decoder, specifically include following steps：
Step S1, the signal for obtaining the magnetic stripe card that magnetic head is read；
Step S2, the signal waveform to the signal are analyzed, and obtain the amplitude and ripple of two neighboring zero extreme point
Shape interval；
It is understandable to be, positive peak point or negative peak point in signal waveform can as zero extreme point, wherein,
The amplitude of extreme point can be regarded as the peak value of peak point；
Step S3, according to two neighboring zero extreme point amplitude and WFS obtain position window；
Step S4, decoded according to the position window correspondence signal of acquisition.
It can be seen that, the present embodiment is by analyzing signal waveform, adaptively to estimate a window, and based on estimation
Position window is decoded, and compared with using the scheme of identical bits window in the prior art, can effectively put forward the estimated accuracy of high-window,
And then raising is decoded into power.
Referring to Fig. 3, the step S2 in the present embodiment is described in detail：
Signal waveform to the signal carries out the data origination that analysis obtains the signal；
First positive peak point, the first negative peak point, the second positive peak point, the are obtained according to the data origination of the signal
2 negative peak points, the 3rd positive peak point ..., N positive peaks point, the range value of N negative peaks point；
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd posivtive spike
Value point ..., N positive peaks point, the range value of N negative peaks point, obtain the absolute value of each range value.
Subsequently there are two kinds of processing methods, two kinds of processing methods are illustrated respectively below：
First method includes：According to the first positive peak point, the first negative peak point, the second positive peak point, second negative
Peak point, the 3rd positive peak point ..., N positive peaks point, the position of N negative peaks point obtain peak-to-valley value interval and paddy peak value
Interval；
The first positive peak mesial point corresponding with the first positive peak point is obtained according to the amplitude of the first positive peak point
Position and the first negative peak mesial point position；
According to the first positive peak point amplitude and the amplitude of the first negative peak point obtain the second negative peak mesial point position and
Second positive peak mesial point position；
The is obtained according to the first positive peak point amplitude, the amplitude of the first negative peak point and the second positive peak point amplitude
Three positive peak mesial point positions and the 3rd negative peak mesial point position；By that analogy, each positive peak mesial point position and minus half peak value are obtained
The position of point；
Positive half value point interval is obtained according to the positive peak mesial point position；Born according to the negative peak mesial point position
Half value point interval.
Second method includes：According to the first positive peak point, the first negative peak point, the second positive peak point, second negative
Peak point, the 3rd positive peak point ..., N positive peaks point, the position of N negative peaks point obtain peak-to-valley value interval and paddy peak value
Interval；
The first negative peak mesial point corresponding with the first negative peak point is obtained according to the amplitude of the first negative peak point
Position and the first positive peak mesial point position；
According to the first negative peak point amplitude and the amplitude of the first positive peak point obtain the second negative peak mesial point position and
Second positive peak mesial point position；According to the first negative peak point amplitude, the amplitude of the first positive peak point and the second negative peak point
Amplitude obtain the 3rd positive peak mesial point position and the 3rd negative peak mesial point position ..., obtain the positive peak mesial point positions of N and
N bears peak mesial point position；
Positive half value point interval is obtained according to each positive peak mesial point position；Negative half value is obtained according to each negative peak mesial point position
Point interval.
In the present embodiment, before step S3, methods described also includes：
The first preset requirement criterion whether is met between the absolute value for judging the positive and negative peak point amplitude obtained；
If so, then judging the peak-to-valley value interval, the paddy peak intervals, the positive half value point interval and described negative half
Whether value point interval meets the second preset requirement criterion；
If so, then performing the step S3, specific execution is as follows：
The positive half value point interval and described negative half according to the positive half value point interval and the negative half value point interval acquiring
The average at value point interval；
Obtain between the peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and the negative half value point
Every mean of mean；
The peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and described negative half are obtained by described
Value point interval mean of mean round after as position window.
Fig. 4 is shown in a kind of magnetic stripe card coding/decoding method that one embodiment of the invention is provided with the occasion of for the same of starting point
Schematic diagram is walked, the principle of the above method is described in detail referring to Fig. 4：
Mentality of designing includes：By signal Analysis, peak valley point and half-peak valley point position are found out, and using between peak valley point
Every with the data such as half-peak valley point interval, multiple bits " 0 " signal of initiating terminal is differentiated according to multiple constraint condition,
Remove waveform means of chaotic signals and interference signal, find out effectively continuous bit " 0 " waveform, and calculate a window T (bit0's
Sampling number), obtained position window T accuracys are high so that synchronous success rate is substantially improved.
It should be noted that it is following assume the signal that detects be on the occasion of, if negative value, then signal waveform and Fig. 4 institutes
It is anti-phase above and below the signal waveform shown, it is exemplified by, to see the signal waveform drawn in Fig. 4 by the signal detected, to illustrate
This synchronous method.In synchronizing process, half peak value is defined as the half of peak value.
The estimation of position window is completed by following steps：
(1) from the signal location point being detected, (the S point position)s in Fig. 4 start to search for the 1st posivtive spike first
Value point (records the maximum searched and maximum value position using variable, recorded if the current amplitude value of search drops to
Maximum half when, that is, the B1 points in Fig. 4, confirm that recorded maximum is exactly positive peak point, this maximum
Position is exactly first positive peak point position), while recording peak mesial point position, i.e. B1 points position, continuation is searched for forward, when
When reaching first negative peak mesial point (B1 point range values are taken into negative value, judged using the value, to search C1 points position),
The position is recorded, continuation is searched for forward, find the 1st negative peak point position D1 (can be carried out by the method for similar search maximum
Search), and the peak value and position are recorded, continuation is searched for forward, finds the 2nd negative peak mesial point (range value and C1 amplitudes
Value is identical) the positive peak mesial points of position E1 and the 2nd (range value is identical with B1 range values) position F1, continues to search for the 2nd forward
Positive peak point (determine the position during by judging that signal amplitude drops to current maximum half, current maximum mean by
Negative value is changed into the maximum of the sampled point arrived after between current search point) position A2, and record the position and amplitude
Value.
Search here, it may be determined that whether signal waveform disclosure satisfy that it needs to be determined that position window T requirement, this is by checking
The symmetry of waveform is realized.It is specific as follows：
These bits " 0 " for the initial segment of swiping the card further are made a distinction, are F2F through B1, C1 to D1 by A1 points
One positive zero of waveform；By D1 points, through one anti-zero that E1, F1 to A2 are F2F waveforms.This algorithm is adjacent to the two
The symmetry of positive zero-sum anti-zero checked, if the two is satisfied by certain condition, then it is assumed that synchronous to pass through, and calculate
Go out a window T.
In order to confirm this two neighboring opposite polarity zero symmetry, algorithm is carried out using following condition 1 and condition 2
Check：
Whether condition 1, the amplitude of two neighboring zero extreme point, which meet to specify, requires (the width of two neighboring zero extreme point
The absolute value of the difference of degree is less than 0.4 times of amplitude the greater in both)；
Whether condition 2, two neighboring zero WFS, which meet to specify, requires (the peak-to-valley value interval calculatedPaddy peak intervals Positive half value point intervalWith negative half value point intervalAverage, San Zhezhong
The difference of maxima and minima be less than 0.15 times of whole average values).
If meeting conditions above, signal waveform disclosure satisfy that true location window T requirement, by peak-to-valley value intervalPaddy peak intervals Positive half value point intervalWith negative half value point intervalAverage, three makes even
Average and round numbers must window T in place, this value is actually sampling number, jumps to (4) step.1) and 2) if be unsatisfactory for
Condition, carry out (2) step.
(2) proceed search, search for the length of bit " 0 " waveform, obtain positive peak mesial point, negative peak mesial point
(positive peak mesial point B2, negative peak mesial point C2 and the 2nd negative peak point D2 in such as Fig. 4, negative peak point can lead to negative peak point
Cross and the position determined when judgement signal amplitude rises to current minimum value half, current minimum value be from the occasion of be changed into negative value it
The minimum value of the sampling point value arrived afterwards between current search point), then using following condition 3) and condition 4) come to adjacent two
Individual opposite polarity zero symmetry is checked：
Whether the amplitude of two neighboring zero extreme point, which meets to specify, requires (the difference of the amplitude of two neighboring zero extreme point
Absolute value be less than 0.4 times of amplitude the greater in both)；
Whether two neighboring zero WFS, which meets to specify, requires (the paddy peak intervals calculatedPeak-to-valley value intervalPositive half value point intervalWith negative half value point interval Average, positive half value point intervalWith positive half value point intervalBetween average, negative half value point
Every With negative half value point intervalAverage, in five most
The difference of big value and minimum value is less than 0.15 times of whole average values).
If meeting conditions above, signal waveform disclosure satisfy that we determined that position window T requirement, by paddy peak intervalsPeak-to-valley value interval Positive half value point intervalWith negative half value point intervalBetween average, positive half value point
Every (With positive half value point intervalBetween average, negative half value point
EveryWith negative half value point intervalAverage, five make even
Average and round numbers must window T in place, jump to (4) step.3) and 4) if being unsatisfactory for condition, (3) step is carried out.
(3) proceed search, search for the length of bit " 0 " waveform, obtain negative peak mesial point, positive peak mesial point
With the 3rd positive peak point (as shown in the negative peak mesial point E2 in Fig. 4, positive peak mesial point F2 and the 3rd positive peak point A3), it is searched for
3) and 4) carry out condition judgment again afterwards, if passed through, calculate window T in place, jump to (4) step, if do not passed through, repeat
Step (2).
(4) synchronized algorithm terminates, carry-out bit window T, i.e., the sampling number of one bit " 0 " waveform.
The synchronized algorithm that four steps are realized more than, realizes position window T estimation, and by result and current sampling point position
Confidence breath output is to next functional module.Timing mechanism is additionally added in certain synchronization module, is exited if time-out
The corresponding synchronization module of method, and reporting system synchronization failure are stated, in order to avoid condition 3) and 4) be unsatisfactory for causing to crash always.
In synchronizing process, half peak value can with previous peaks or valley be changed, can also be always maintained at solid
Which kind of scheme is definite value, take actually, can carry out compromise consideration according to performance and complexity, and respective algorithms are adjusted.
Fig. 5 shows a kind of structural representation for magnetic stripe card decoding apparatus that one embodiment of the invention is provided, referring to Fig. 5,
The device includes：Acquisition module 510, analysis module 520, processing module 530 and decoder module 540, wherein；
Acquisition module 510, the signal of the magnetic stripe card for obtaining magnetic head reading；
Analysis module 520, is analyzed for the signal waveform to the signal, obtains two neighboring zero extreme point
Amplitude and WFS；
Processing module 530, amplitude and WFS for the extreme point according to two neighboring zero obtain position window；
Decoder module 540, is decoded for the position window correspondence signal according to acquisition.
It should be noted that when user applies magnetic stripe card, acquisition module 510 passes through the letter on head read magnetic stripe card
Number, and analysis module 520 is transmitted the signal to, analyzed, obtained by the signal waveform of 520 pairs of signals of analysis module
The amplitude and WFS of two neighboring zero extreme point, and the amplitude got and WFS are sent to processing module
530, position window, processing module 530 are obtained according to the amplitude and WFS of two neighboring zero extreme point by processing module 530
The position window for calculating acquisition is sent to decoder module 540, and then entered by decoder module according to the position window correspondence signal of acquisition
Row decoding.
It can be seen that, the present embodiment is by analyzing signal waveform, adaptively to estimate a window, and based on estimation
Position window is decoded, and compared with using the scheme of identical bits window in the prior art, can effectively put forward the estimated accuracy of high-window,
And then raising is decoded into power.
The corresponding module in the present embodiment is described in detail below：
Analysis module 520, the data that analysis obtains the signal are carried out specifically for the signal waveform to the signal
Point；First positive peak point, the first negative peak point, the second positive peak point, the second negative peak are obtained according to the data origination of the signal
It is worth point, the 3rd positive peak point ..., N positive peaks point, the range value of N negative peaks point；According to the first positive peak point,
First negative peak point, the second positive peak point, the second negative peak point, the 3rd positive peak point ..., N positive peaks point, N negative peaks
It is worth the range value of point, obtains the absolute value of each range value.
The processing module 530, specifically for being taken absolute value according to the range value of the positive peak point and negative peak point；
The positive half value point interval and the negative half value point interval are obtained according to the positive half value point interval and the negative half value point interval
Average；Obtain the peak-to-valley value point interval, the paddy peak point interval and the positive half value point interval and the negative half value point
The average value at interval；The peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and institute are obtained by described
State negative half value point interval mean of mean round after as position window.
Fig. 6 shows a kind of structural representation for magnetic stripe card decoding apparatus that another embodiment of the present invention is provided, referring to figure
6, on the basis of Fig. 5 correspondence embodiments include feature, the present embodiment also includes：Judge module 640；
The judge module 640, for judging it is pre- whether the absolute value of amplitude of the positive and negative peak point meets first
If it is required that criterion；If so, then judging the peak-to-valley value interval, the paddy peak intervals, the positive half value point interval and described negative
Whether half value point interval meets the second preset requirement criterion；If so, then allowing the processing module 650 to bring into operation；If it is not,
Processing module 650 is not allowed then to carry out relevant treatment.
For above-described embodiment, for method embodiment, in order to be briefly described, therefore it is all expressed as a series of
Combination of actions, but those skilled in the art should know, embodiment of the present invention is not limited by described sequence of movement
System, because according to embodiment of the present invention, some steps can be carried out sequentially or simultaneously using other.Secondly, this area skill
Art personnel should also know that embodiment described in this description belongs to preferred embodiment, and involved action is simultaneously
It is not necessarily necessary to embodiment of the present invention.
For device embodiments, because it is substantially similar to method embodiment, so the comparison of description is simple
Single, related part illustrates referring to the part of method embodiment.
It should be noted that in all parts of the device of the present invention, according to the function that it to be realized to therein
Part has carried out logical partitioning, still, and the present invention is not only restricted to this, and all parts can be repartitioned as needed
Or combination.
The all parts embodiment of the present invention can be realized with hardware, or with one or more processor
The software module of operation is realized, or is realized with combinations thereof.In the present apparatus, PC by realize internet to equipment or
Device remote control, the step of accurately control device or device are each operated.The present invention is also implemented as being used to perform
The some or all equipment or program of device of method as described herein are (for example, computer program and computer
Program product).Being achieved in that the program of the present invention can store on a computer-readable medium, and the file that program is produced
Or document produces data report and cpk reports etc. with can be statistical, batch testing can be carried out to function and be counted.It should note
Meaning is that the present invention will be described rather than limits the invention for above-mentioned embodiment, and those skilled in the art
Replacement embodiment can be being designed without departing from the scope of the appended claims.In the claims, should not be by
Any reference symbol between bracket is configured to limitations on claims.Word "comprising", which is not excluded the presence of, not to be listed in
Element or step in claim.Word "a" or "an" before element does not exclude the presence of multiple such members
Part.The present invention can be by means of including the hardware of some different elements and coming real by means of properly programmed computer
It is existing.In if the unit claim of equipment for drying is listed, several in these devices can be by same hardware branch
To embody.The use of word first, second, and third does not indicate that any order.These words can be explained and run after fame
Claim.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can not depart from this
Various modifications and variations are made in the case of the spirit and scope of invention, such modifications and variations are each fallen within by appended right
It is required that within limited range.
Claims (10)
1. a kind of magnetic stripe card coding/decoding method, it is characterised in that including：
Step S1, the signal for obtaining the magnetic stripe card that magnetic head is read；
Step S2, the signal waveform to the signal are analyzed, between the amplitude and waveform that obtain two neighboring zero extreme point
Every；
Step S3, according to two neighboring zero extreme point amplitude and WFS obtain position window；
Step S4, according to the position window of acquisition the signal is decoded.
2. according to the method described in claim 1, it is characterised in that the step S2 is specifically included：
Signal waveform to the signal carries out the data origination that analysis obtains the signal；
First positive peak point, the first negative peak point, the second positive peak point, the second negative peak are obtained according to the data origination of the signal
It is worth point, the 3rd positive peak point ..., N positive peaks point, the range value of N negative peaks point；
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd positive peak
Point ..., N positive peaks point, the range value of N negative peaks point, obtain the absolute value of each range value.
3. method according to claim 2, it is characterised in that the step S2 is specifically included：
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd positive peak
Point ..., N positive peaks point, the position of N negative peaks point obtain peak-to-valley value interval and paddy peak intervals；
The first positive peak mesial point position corresponding with the first positive peak point is obtained according to the amplitude of the first positive peak point
With the first negative peak mesial point position；
Second negative peak mesial point position and second is obtained according to the first positive peak point amplitude and the amplitude of the first negative peak point
Positive peak mesial point position；
The the 3rd just half is obtained according to the first positive peak point amplitude, the amplitude of the first negative peak point and the second positive peak point amplitude
Peak point position and the 3rd negative peak mesial point position；By that analogy, each positive peak mesial point position and negative peak mesial point position are obtained；
Positive half value point interval is obtained according to the positive peak mesial point position；Negative half value point is obtained according to the negative peak mesial point position
Interval.
4. method according to claim 2, it is characterised in that the step S2 is specifically included：
According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd positive peak
Point ..., N positive peaks point, the position of N negative peaks point obtain peak-to-valley value interval and paddy peak intervals；
The first negative peak mesial point position corresponding with the first negative peak point is obtained according to the amplitude of the first negative peak point
With the first positive peak mesial point position；
Second negative peak mesial point position and second is obtained according to the first negative peak point amplitude and the amplitude of the first positive peak point
Positive peak mesial point position；According to the width of the first negative peak point amplitude, the amplitude of the first positive peak point and the second negative peak point
Degree obtains the 3rd positive peak mesial point position and the 3rd negative peak mesial point position ..., the acquisition positive peak mesial point positions of N and N is negative
Peak mesial point position；
Positive half value point interval is obtained according to each positive peak mesial point position；According between each negative negative half value point of peak mesial point position acquisition
Every.
5. the method according to claim 3 or 4, it is characterised in that before step S3, methods described also includes：
The first preset requirement criterion whether is met between the absolute value for judging the positive and negative peak point amplitude obtained；
If so, then judging between the peak-to-valley value interval, the paddy peak intervals, the positive half value point interval and the negative half value point
Every whether meeting the second preset requirement criterion；
If so, then performing the step S3.
6. method according to claim 5, it is characterised in that the step S3 is specifically included：
Positive half value point interval and the negative half value point according to the positive half value point interval and the negative half value point interval acquiring
The average at interval；
Obtain the equal of the peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and the negative half value point interval
The average value of value；
By between the acquisition peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and the negative half value point
Every mean of mean round after as position window.
7. a kind of magnetic stripe card decoding apparatus, it is characterised in that including：
Acquisition module, the signal of the magnetic stripe card for obtaining magnetic head reading；
Analysis module, is analyzed for the signal waveform to the signal, obtain two neighboring zero extreme point amplitude and
WFS；
Processing module, amplitude and WFS for the extreme point according to two neighboring zero obtain position window；
Decoder module, is decoded for the position window correspondence signal according to acquisition.
8. device according to claim 7, it is characterised in that the analysis module, specifically for the letter to the signal
Number waveform carries out the data origination that analysis obtains the signal；According to the data origination of the signal obtain the first positive peak point,
First negative peak point, the second positive peak point, the second negative peak point, the 3rd positive peak point ..., N positive peaks point, N negative peaks
The range value of point；According to the first positive peak point, the first negative peak point, the second positive peak point, the second negative peak point, the 3rd just
Peak point ..., N positive peaks point, the range value of N negative peaks point, obtain the absolute value of each range value.
9. device according to claim 8, it is characterised in that described device also includes：Judge module；
First whether is met between the judge module, the absolute value for the positive and negative peak point amplitude for judging to be obtained to preset
It is required that criterion；If so, then judging the peak-to-valley value interval, the paddy peak intervals, the positive half value point interval and described negative half
Whether value point interval meets the second preset requirement criterion；If so, then allowing the processing module to bring into operation.
10. device according to claim 8 or claim 9, it is characterised in that the processing module, specifically for according to it is described just
The average at positive half value point interval and the negative half value point interval described in half value point interval and the negative half value point interval acquiring；Obtain
The average at the peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and the negative half value point interval is averaged
Value；By between the acquisition peak-to-valley value interval, the paddy peak intervals and the positive half value point interval and the negative half value point
Every mean of mean round after as position window.
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| CN201710012550.9A CN106997443B (en) | 2017-01-09 | 2017-01-09 | Magnetic stripe card coding/decoding method and device |
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| CN201710012550.9A CN106997443B (en) | 2017-01-09 | 2017-01-09 | Magnetic stripe card coding/decoding method and device |
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| CN108734036A (en) * | 2018-05-18 | 2018-11-02 | 深圳市中科汉天下电子有限公司 | A kind of coding/decoding method and device of magnetic stripe card |
| CN110688867A (en) * | 2019-09-12 | 2020-01-14 | 兆讯恒达微电子技术(北京)有限公司 | Method for improving information synchronization of magnetic stripe card reader |
| CN117214675A (en) * | 2023-11-08 | 2023-12-12 | 无锡力芯微电子股份有限公司 | Test method and test circuit for magnetic stripe card information reading integrated circuit |
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| CN117214675B (en) * | 2023-11-08 | 2024-01-30 | 无锡力芯微电子股份有限公司 | Test method and test circuit for magnetic stripe card information reading integrated circuit |
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| CN106997443B (en) | 2019-08-23 |
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