JPH0670800B2 - Card reader - Google Patents

Description

The present invention relates to a card that reads card data recorded on a card and transfers the card data to a memory, and also reads the card data transferred to the memory to determine authenticity. The present invention relates to a reading device.

[Prior Art] In the conventional card reading device, the CPU reads the waveform-formatted card data read by the reading head.
Is sequentially read by the 1F, 2F method to determine the pattern, and the determination result is compared with the pattern based on the 1F, 2F method unique to this device stored in the memory in advance to determine its true or false, and it is false. In this case, the card is again conveyed to the reading position and read by the reading head again.

The 1F and 2F methods drive two timers at the start of detection of the waveform-shaped card data, and if there is a change in the waveform when the first timer, which has a shorter time, has timed out, this data is converted to 2F. The data is used as a reference. When the second timer, which has a long time as a reference, has timed out, a change in the waveform is detected.
This is 1F data, and in this way, a boundary point (change point) of 1F data and 2F data is detected to discriminate 1F data and 2F data mixed in card data.

[Problems to be Solved by the Invention] The conventional card reading device described above is
Since the card data whose waveform is shaped at the boundary point of 2F data is read and detected, even if the data part (boundary point) to be read on the card is damaged, no matter how many times it is read again, There was a problem that a read error occurred.

Further, as shown in the waveform diagram of FIG. 9, when the card surface is rubbed by the head, the waveform of the card data, which should originally be indicated by the solid line, is pulled to the left and right, and this waveform is expanded (peak shift state). When the state indicated by the dotted line is generated, a card data detection error is likely to occur, and once a detection error occurs, there is a problem that the subsequent data cannot be discriminated because successive reading is performed. It was

[Means for Solving the Problem] In order to solve such a problem, a card reading device according to the present invention is based on a sampling frequency in which data including reference information and value information recorded on a card is set. Data transfer means for reading and transferring to the memory, data reading means for reading the transferred data, and an average sampling number of the reference information read by the reading means is calculated, and based on this sampling number Analysis means for determining the case number of the above-mentioned value information consisting of the first data and the second data and this case number are compared with the number set in advance in the memory, and then the combination number is determined to make a determination. And a sampling frequency for the data transfer means when the determination means determines that the analysis result of the analysis means is negative. Is made to be able to read out card data.

Also, a data transfer means for reading the data consisting of the reference information and the value information recorded on the card at the highest sampling frequency and transferring it to the memory, and a data reading means for reading the transferred data according to the set thinning rate. An analyzing means for calculating an average sampling number of the reference information read by the data reading means and determining a case number of the value information consisting of the first data and the second data based on the sampling number. And a judgment means for comparing the case number with a number set in advance in the memory and then determining the combination number for judgment. When the judgment means judges that the analysis result of the analysis means is negative, the reading means is provided. In contrast, the thinning rate is reduced so that the transfer data in the memory can be read out.

[Operation] When the determination unit determines that the analysis result of the analysis unit is negative,
The data transfer means increases the sampling frequency to read the data from the card.

When the determination means determines that the analysis result of the analysis means is negative, the reading means lowers the thinning rate and reads the data transferred to the memory.

In addition, the case number of the value information composed of the first data and the second data is determined based on the calculated average number of samples of the reference information, and this number is compared with the number preset in the memory. The authenticity of the value information is judged.

EXAMPLES Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a card reading device according to the present invention. In the figure, 1 is a CPU that controls the entire card reader, 2 is a ROM that stores a program, 3 is a RAM (memory) that stores the read card data, and 4 is the read card data DMA unit (data transfer means) for transferring to RAM3, 5 for a magnetic card, 6 for a reading head unit for reading card data, 7 for an I / O unit for waveform-shaping the read card data and inputting / outputting, and M for a card 5 is a motor that conveys 5.
Further, as shown in FIG. 2, a timing bit (reference information) consisting of 16-bit 1F data (first data) is recorded in the timing bit portion 10 of the head portion of the card 5, and the succeeding card data portion is recorded. 1F data and 2F for 11
Card data (value information) composed of data (second data) is recorded.

Further, FIG. 3A shows an example of a waveform in which the timing bit is shaped, and FIG. 3B shows a state in which the timing bit is sampled and transferred to the RAM 3. In the figure, 11 ... Shows a state where the waveform is at "H" level, and 00 ... Shows a state where the waveform is at "L" level. The number of 11 ... 00 is the number of samplings, and the total number of samplings for 16 bits is added.
If you divide by 16, you can calculate the average value of the number of samples per bit, even if the waveform between each bit fluctuates,
This is set as an accurate reference value, and as a result, the combination pattern of card data, which will be described later, can be identified from the sampling number of 1F data which is the reference.

Further, FIG. 4 (a) shows an example of the shaped waveform of four card data, and FIG. 4 (b) is a diagram showing a state in which this card data is sampled and transferred to RAM3. is there. In addition, two in the figure show 1F data and two show 2F data. Also, 11 ... in the figure is
The waveform shows the state of "H" level, and 00 ... shows the state of the waveform of "L" level.
Represents the sampling number, and the total pulse width (total time) of these four data is calculated by summing the sampling numbers of these four data, and the case number corresponding to this time is determined as described later. It

In addition, by counting the sampling number of each 1F, 2F data and comparing it with the reference 1F data sampling number obtained above, even if there is some waveform fluctuation at the boundary point between each data, this A combination pattern of four data (combined from two 1F data and two 2F data in this example) can be identified.

Next, an outline of the operation of this card reading device will be described. First, the timing bits and the card data read by the read head unit 6 are sent to the I / O unit 7, where the waveform is shaped. After that, by CPU1, DMA
When a card data read instruction is issued to the control unit 4, the DMA control unit 4 reads the timing bits and the card data input to the I / O unit 7 at a preset sampling frequency and transfers them to the RAM 3. When the transfer is completed, a transfer end signal is sent to CPU1.

After that, the CPU 1 sets the RA according to the preset thinning rate.
The timing bits and card data transferred to M are read, and the pattern of the card data that follows thereafter is analyzed based on the read timing bits, and the results of this analysis and the pattern set in advance in RAM3 A comparison is made to determine the authenticity of the card data.

Next, FIGS. 5 and 6 are flow charts for explaining the operation of the first embodiment of the card reading apparatus. First, the operation of the card reader will be described with reference to FIG.

When the magnetic card 5 is inserted and reaches the reading start position in step 50, the motor M is driven in step 51 and the magnetic card 5 is conveyed in step 52. Then, the timing bits and the card data of the card 5 being conveyed are read by the read head unit 6 and
When the waveform is shaped by the I / O unit 7, it is sampled by the DMA control unit 4 at the preset sampling frequency in step 53 and transferred to the RAM 3.

Then, in step 54, it is determined that the card data transfer is completed. When it is "N", the process returns to step 52, and when it is "Y", that is, when the transfer of the card data is completed, the transfer data analysis process described later is performed in step 55, and as a result, an error occurs. Error flag is set. The transfer data analysis process will be described in detail with reference to the flowchart of FIG.

Then, the result of this transfer data analysis processing is judged in step 56. When the result is "N" in step 56, that is, if no error occurs, the card data whose analysis has been completed is processed in step 57. If "Y" in step 56, that is, if the error flag is set, the sampling frequency is set to a high frequency in step 58, the card 5 is conveyed to the reading start position in step 59, and the process returns to step 51. . As a result, this card 5
The timing bits and the card data in the above are sampled by the DMA control unit 4 at a higher sampling frequency and re-transferred to the RAM 3.

Next, the operation of the card processing device will be described based on the flowchart of FIG. As described above, this flowchart is for the CPU 1 to analyze the data transferred to the RAM 3.

This transfer data analysis process is based on the average value of the 16-bit timing bit waveform in the transfer data, that is, the average value of 1F data, and based on this reference value, the subsequent 1F
The card data consisting of data and 2F data is discriminated.

In step 71, the average value of the reference 1F data, that is, the number of samplings per 1 bit of the timing bit, is calculated, and then in step 72, 2F, which is 1/2 of the 1F data, is obtained.
Find the number of data samples.

Next, at step 73, the first four card data in the transfer data are detected by counting the change points of the data, and the sampling numbers of these four card data are summed. And
In step 74, the sampling number of each of the four card data is calculated, and the 1F data and 2F of the four data are calculated from the calculated sampling number and the sampling number of the 1F and 2F data in the timing bit obtained above.
The combination of data is identified and the combination pattern number is determined. Then, in step 75, the total time of these four card data waveforms is calculated from the total number of the four card data supplings, and a corresponding case number is given.

Then, in step 76, it is determined whether the case number preset in the RAM3 and the assigned case number match, and when this is "Y", that is, the corresponding case number is the RAM3.
If it is set in advance, it is judged in step 77 whether the combination number which is set in the RAM 3 in advance and belongs to this case number and the already determined combination number. Then, when this is "Y", four card data corresponding to the corresponding case number and combination number are generated in another area of the RAM 3 in step 78, and it is determined in step 79 whether the card data is completely analyzed. . Then, when this is "Y", this transfer data analysis processing is ended, and when it is "N", that is, when the analysis is not ended, the next four card data are taken out in step 80, and the process returns to step 73 and the above is executed. Similar processing is performed.

When generating card data in another area of RAM3,
When card data with a pattern extremely different from the combination pattern generated one time ago is generated,
It is generated by appropriately performing correction processing so as to prevent unnatural card data. When the result is "N" in step 76 and step 77, that is, when the corresponding case number and combination pattern number are not set in the RAM, it is regarded as an error and the error flag is set in step 81. The transfer data analysis process ends.

Next, FIGS. 7 and 8 show the second part of this card reading device.
2 is a flowchart illustrating an example of the above. First, the 7th
The operation will be described based on the flowchart in the figure.
The same parts as those of the flowchart of FIG. 5 which has already been described are designated by the same reference numerals and the description thereof will be omitted.

When the card 5 is transported, the timing bits and the card data which are waveform-shaped and stored in the temporary memory in step 90 are sampled at the highest sampling frequency by the DMA controller 4 and transferred to the RAM 3.

Then, in step 91, it is determined that the card data transfer is completed. Then, when this is "N", the process returns to step 52, and when it is "Y", that is, when the transfer of the card data is completed, the read-out thinning rate of the data transferred to the RAM 3 is set to the maximum in step 92. When this thinning rate is set to the maximum, the CPU 1 reads out the data by thinning out the transfer data to the maximum (most coarsely sampling). Subsequently, in step 93, transfer data analysis processing, which will be described later, is performed, and if an error occurs as a result, an error flag is set. The transfer data analysis process will be described in detail with reference to the flowchart of FIG.

Then, the result of this transfer data analysis processing is judged in step 94. If "N" in the step 94, that is, if no error occurs, the card data whose analysis has been completed is processed in a step 95. If "Y" in step 94, that is, if the error flag is set, the next thinning rate is set in step 96, that is, the thinning rate for more dense sampling is set, and the process returns to step 93. . As a result, the timing bits and card data in the RAM 3 are read and analyzed by the CPU 1 at a higher sampling frequency.

Next, the operation of this apparatus will be described based on the flowchart of FIG. This flow chart is a flow chart for explaining the analysis processing of the data transferred to the RAM 3.

The CPU 1 reads the transfer data on the RAM 3, that is, the timing bits and the card data, according to the thinning rate set in step 70. After that, CPU1 executes step 71
Subsequent processing will be executed, but if an error occurs in the transfer data analysis processing after step 71, an error flag is set and the transfer data analysis processing is ended. Since the processing after step 71 has already been described in detail in the flowchart of FIG. 6, the description thereof will be omitted.

As described above, the card reading device of the present invention has the timing bit unit 10 and the card data unit in the card 5, respectively.
11, the timing bit unit 10 and the card data unit 11 are conveyed at a common speed in one device even if there are variations in the speed variation of the motor M for each device. The averaged value of the timing bits of the timing bit unit 10 that is stored at the same speed as the card data unit 11 is stored in the memory and the average value of the timing bits is used as a reference value. 1F, 2
The combination pattern composed of F data is detected.

[Effects of the Invention] As is clear from the above description, in the card reading apparatus according to the present invention, when the determination unit determines that the analysis result of the analysis unit is negative, the sampling frequency is increased with respect to the data transfer unit. Since it is configured to read the data of the card, even if the data part to be read on the card is damaged, undamaged data in the vicinity of the damaged part can be detected by sampling at a high frequency. As a result, the reading error can be eliminated.

If the determination means determines that the analysis result of the analysis means is negative, the reading means reduces the thinning rate to read the data transferred to the memory. If the error occurs, the read interval of the data transferred to the memory will be shortened and the data will be read again.Even if a data detection error occurs due to the peak shift condition, the data before and after this error data will be read again. Therefore, there is an effect that it becomes possible to discriminate subsequent data.

Also, the case number and combination number of the value information are determined based on the calculated average number of samples of the reference information, and the authenticity of the value information is determined by comparing these numbers with the numbers set in the memory in advance. I configured it to
There is an effect that the authenticity of the value information can be accurately determined.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a card reading device according to the present invention, FIG. 2 is a block diagram of the card, FIGS. 3 and 4 are timing charts of data recorded on the card, and FIG. , FIG. 6 is a flow chart for explaining the operation of the first embodiment of this apparatus, FIGS. 7 and 8 are flow charts for explaining the operation of the second embodiment of this apparatus, and FIG. 9 is the peak shift of this apparatus. It is a timing chart explaining a phenomenon. 1 ... CPU, 2 ... ROM, 3 ... RAM, 4 ... DMA control unit,
5 ... Magnetic card, 6 ... Read head, 7 ... I /
O part, 10 ... Timing bit part, 11 is card data part, M ... Motor.

Claims (2)

[Claims] 1. A card reading device for reading data recorded on a card to be conveyed, wherein data consisting of reference information and value information recorded on the card is read based on a set sampling frequency and stored in a memory. Data transfer means for transferring, data reading means for reading the transferred data, average sampling number of the reference information read by the reading means, and first data based on the sampling number And a analyzing means for determining a case number of the value information consisting of second data, and a judging means for comparing the case number with a number set in the memory in advance and then determining a combination number for determination. , When the determination means determines that the analysis result of the analysis means is negative, A card reading device, wherein a sampling frequency is increased to read data from the card. 2. A card reading device for reading data recorded on a conveyed card, wherein data consisting of reference information and value information recorded on the card is read at a highest sampling frequency and transferred to a memory. Transfer means, data reading means for reading the transferred data according to a set thinning rate, and an average sampling number of the reference information read by the data reading means is calculated and based on this sampling number. Analysis means for determining the case number of the value information consisting of the first data and the second data, and a judgment for comparing the case number with a number preset in the memory and then determining a combination number. And a reading means when the judging means judges that the analysis result of the analyzing means is not acceptable. A card reading device characterized in that the thinning rate is lowered for the reading means to read the transfer data of the memory.