JP5163633B2 - Magnetic reader, magnetic reading method and program - Google Patents

Description

  The present invention relates to a magnetic reading device, a magnetic reading method, and a program.

One of the methods for restoring the original data from the electrical signal obtained by the magnetic head reading the data stored in the magnetic medium by FM (Frequency Modulation) method such as F2F (Two-Frequency-Coherent-Phase) There is a peak read. The peak read is a method that detects the peak interval of the read electrical signal and restores the original signal from the detected peak interval, and is effective even when the magnetic medium is weak.
However, in general, an electric signal read from a magnetic medium has a peak interval shift due to play of a mechanical mechanism of a magnetic head mounting portion. Due to this shift in the peak interval, a bit shift in units of 1 bit is likely to occur when performing peak read.

FIG. 9 is a configuration diagram showing a schematic configuration of a magnetic head driving unit of a general magnetic card reader. Due to the play between the toothed pulley 1002 and the toothed belt 1003 and the play between the toothed belt 1003 and the magnetic head base 1005 in FIG.
As a method for detecting an error with respect to a bit shift at the time of peak read, a method for determining the quality of a read result by comparing an actually measured peak interval with a logical interval time calculated from the standard, or a JIS2 standard A method for determining whether the reading result is good or not using the horizontal odd-even test defined in (1) can be considered.

However, the method of judging the quality of the reading result by comparing the actually measured peak interval with the logical interval time calculated from the standard can detect the reading error, but cannot correct the error, and the reading rate is reduced. It cannot be improved.
Further, even in the horizontal odd-even inspection, the reading error detected based on the peak interval cannot be corrected, and the reading rate cannot be improved for this reading error.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a magnetic reading apparatus capable of reducing reading errors when performing peak reading and improving the reading rate. It is in.

This invention has been made to solve the problems described above, the magnetic reader according to an aspect of the present invention is a magnetic reading device for reading data from a magnetic recording medium on which data is recorded by frequency modulation scheme The magnetic head is moved relative to the magnetic recording medium in the forward direction and the reverse direction, the magnetic head unit reads the magnetic data in the forward direction and the reverse direction, and outputs an electrical signal; A character data generating unit that generates a character for each of the electrical signal of magnetic data read by relative movement in the direction and the electrical signal of magnetic data read by relative movement in the opposite direction; and the magnetic head, The electrical signal of the magnetic data read by relative movement in the forward direction and the magnetic data read by relative movement in the reverse direction. A determination unit that determines whether or not there is a reading error for each of the electrical signals, and the magnetic data read by moving the magnetic head relative to the direction determined to have no reading error based on the determination result of the determination unit The character generated from the electrical signal is output, and when it is determined that there is a reading error in any direction, a result output unit that outputs an error and the peak interval of the electrical signal output from the magnetic head unit are detected A peak interval detection unit; a peak interval inspection unit that determines the presence or absence of an abnormality by comparing the peak interval with a logical interval time determined from a magnetic data standard; and a digital data generation unit that generates digital data of a bit string from the peak interval And the character data generator generates a character from the digital data. And the determination unit performs an odd / even test on the digital data to determine whether there is an abnormality for each of the forward reading and the backward reading, and the digital A character inspection unit that determines whether or not there is an abnormality for each of the forward reading and the reverse reading based on whether or not conversion from data to the character is possible, and the result output unit includes the peak Based on the determination result of the interval inspection unit, the determination result of the odd / even inspection unit, and the determination result of the character inspection unit, the character generated by the character data generation unit from the forward reading result, or the reverse A character generated by the character data generation unit or an error is output from a direction reading result. To do.

Also, the magnetic reading method according to an aspect of the present invention, there is provided a magnetic read method of a magnetic reading device for reading data from a magnetic recording medium in which data in the frequency modulation method is recorded, the magnetic recording medium of the magnetic head A reading step of relatively moving in the forward direction and the reverse direction, reading the magnetic data in the forward direction and the reverse direction and outputting an electrical signal, and reading the magnetic data read by relatively moving the magnetic head in the forward direction A character data generation step for generating a character for each of the electrical signal and the electrical signal of the magnetic data read by relative movement in the reverse direction; and the magnetic data read by relative movement of the magnetic head in the forward direction Each of the electrical signal of data and the electrical signal of the magnetic data read by relative movement in the opposite direction A determination step of determining whether the read error with, based on the determination result in the determining step, generating the magnetic head, the electric signal of the magnetic data read by relatively moving in a direction determined that no reading error A result output step that outputs an error when it is determined that there is a reading error in any direction, and a peak interval detection step that detects a peak interval of the electrical signal output in the reading step; A peak interval inspection step for determining the presence or absence of abnormality by comparing the peak interval with a logical interval time determined from a magnetic data standard, and a digital data generation step for generating digital data of a bit string from the peak interval. In the character data generation step, A character is generated from the digital data, and in the determining step, an odd / even test is performed on the digital data to determine whether there is an abnormality for each of the forward reading and the backward reading. And a character inspection step for determining whether or not there is an abnormality in each of the forward reading and the backward reading based on whether or not the digital data can be converted into the character, and the result output step Then, based on the determination result in the peak interval inspection step, the determination result in the odd / even inspection step, and the determination result in the character inspection step, the character data generation step from the forward reading result The key is determined based on the generated character or the reverse reading result. Either the character generated in the character data generation step or an error is output .

Also, a program according to an aspect of the present invention, by relatively moving the magnetic head in the forward and backward direction with respect to the magnetic recording medium on which data is recorded by frequency modulation scheme, magnetic data to each of the forward and reverse Is a program for generating a character from an electric signal generated by reading out the electric signal, the electric signal of the magnetic data read by the computer by relatively moving the magnetic head in the forward direction, and the reverse direction A character data generation step for generating a character for each of the electrical signals of the magnetic data read relative to the electrical signal, and the electrical data of the magnetic data read by the computer by relatively moving the magnetic head in the forward direction. Each of the signal and the electric signal of the magnetic data read by relative movement in the opposite direction A determination step of determining whether the read error with the computer, on the basis of the determination result of the determination step, the magnetic head, the magnetic data read by relatively moving in a direction determined that no reading error A result output step of outputting a character generated from the electrical signal and outputting an error when it is determined that there is a reading error in any direction, and a peak interval of the electrical signal output by the computer in the reading step A peak interval detection step for detecting a peak interval, a peak interval inspection step for the computer to determine the presence or absence of an abnormality by comparing the peak interval and a logical interval time determined from a magnetic data standard, and the computer from the peak interval Generate bit string digital data Digital data generation step, and in the character data generation step, the computer generates a character from the digital data, and in the determination step, an odd / even inspection is performed on the digital data, An odd / even inspection step for determining whether there is an abnormality for each of the forward reading and the backward reading, and based on whether or not the digital data can be converted to the character, the forward reading and the backward reading A character inspection step for determining whether or not there is an abnormality for each of the reading, and in the result output step, the determination result in the peak interval inspection step and the determination in the odd / even inspection step in the computer Results and character inspection Based on the determination result in step, the character generated in the character data generation step from the reading result in the forward direction, the character generated in the character data generation step from the reading result in the reverse direction, or This is a program that outputs one of the errors .

  According to the present invention, it is possible to reduce reading errors when performing peak reading and improve the reading rate.

It is a schematic block diagram which shows the structure of the magnetic reader in one Embodiment of this invention. It is a schematic block diagram which shows the structure of the center calculating part 11 in the same embodiment. It is a figure which shows the example from which the peak space | interval which a peak space | interval detection part detects in the same embodiment shifts | deviates. It is a figure which shows the determination criterion of the peak interval which the peak interval test | inspection part 115 performs in the same embodiment. It is a figure which shows the example of the digital data which the digital data generation part 113 produces | generates in the same embodiment. It is a figure which shows the example of the horizontal direction odd / even test which the odd / even test | inspection part 116 performs in the same embodiment. It is a figure which shows the example of the character test | inspection which the character test | inspection part 117 performs in the embodiment. 4 is a flowchart showing a processing procedure in which the magnetic reading device 1 reads magnetic data and outputs a character or error as a reading result in the embodiment. It is a block diagram which shows schematic structure of the magnetic head drive part of a general magnetic card reader.

Embodiments of the present invention will be described below with reference to the drawings.
In the present embodiment, the case where the present invention is applied to a magnetic card reader will be described. However, the present invention is not limited to a magnetic card, and is applied to various magnetic storage media that are recorded by the FM method and can be read bidirectionally. it can.
FIG. 1 is a schematic block diagram showing the configuration of a magnetic reading apparatus according to an embodiment of the present invention.
In the figure, the magnetic reading device 1 includes a central processing unit 11, JIS 2 (“2” of “JIS 2” is a Roman numeral capital letter, the same applies hereinafter), a magnetic head unit 21, an ISO magnetic head unit 31, and a memory unit 41. To do.

The JIS2 magnetic head unit 21 includes a magnetic head that reads magnetic data and outputs an electrical signal, and a drive mechanism that moves the magnetic head relative to the magnetic card in both forward and reverse directions. The JIS2 magnetic head unit 21 reads magnetic data recorded in accordance with the JIS2 standard with an electric signal.
Similar to the JIS 2 magnetic head unit 21, the ISO magnetic head unit 31 includes a magnetic head that reads magnetic data and outputs an electrical signal, and a drive mechanism that relatively moves the magnetic head in both forward and reverse directions with respect to the magnetic card. . The ISO magnetic head unit 31 reads magnetic data recorded in accordance with JIS1 (“1” of “JIS1” is a Roman numeral capital letter, the same shall apply hereinafter) with an electrical signal. In the following, a case where data is restored from an electrical signal read by the JIS 2 magnetic head unit 21 will be described, and description of the ISO magnetic head unit 31 will be omitted.
The central processing unit 11 performs error detection and data restoration of electrical signals read from the magnetic medium by the JIS 2 magnetic head unit 21 and the ISO magnetic head unit 31. The central processing unit 11 controls the JIS 2 magnetic head unit 21 and the ISO magnetic head unit 31. The central processing unit 11 is realized by a central processing unit (CPU) included in the magnetic reading device 1 executing a program.
The memory unit 41 stores a program executed by the central processing unit 11. The central processing unit 11 functions as a working memory for temporarily storing data. The memory unit 41 is realized on a storage medium included in the magnetic reading device 1.

FIG. 2 is a schematic block diagram showing the configuration of the central processing unit 11.
In the figure, the central processing unit 11 includes a reading result input unit 111, a peak interval detection unit 112, a digital data generation unit 113, a character data generation unit 114, a peak interval inspection unit 115, an odd / even inspection unit 116, and a character inspection unit 117. And a result output unit 118.
The read result input unit 111 receives the electrical signal read by the JIS 2 magnetic head unit 21 (FIG. 1) and outputs it to the peak interval detection unit 112.
The peak interval detection unit 112 detects a peak position from each of the electrical signal of the forward reading result and the electrical signal of the backward reading result output from the reading result input unit 111, and the peak position is detected from the detected peak position. Detect intervals. The peak interval detection unit outputs the detected peak interval to the digital data generation unit 113 and the peak interval inspection unit 115.

The digital data generation unit 113 generates digital data from each of the forward peak interval and the reverse peak interval output from the peak interval detection unit 112. The digital data generation unit 113 outputs the generated digital data to the character data generation unit 114 and the odd / even inspection unit 116.
The character data generation unit 114 generates a character from each of the forward digital data and the reverse digital data output from the digital data generation unit 113. The character data generation unit 114 outputs the generated character to the character inspection unit 117 and the result output unit 118.
The peak interval inspection unit 115 compares each of the forward peak interval and the reverse peak interval output from the peak interval detection unit 112 with the logical interval time, and determines whether there is a reading error. The peak interval inspection unit 115 outputs the determination result to the result output unit 118.

The odd / even test unit 116 performs a horizontal odd / even test on each of the forward digital data and the reverse digital data output from the digital data generation unit 113 to determine whether there is a reading error. The odd / even inspection unit 116 outputs the determination result to the result output unit 118.
The character inspection unit 117 performs character inspection for each of the forward and backward characters output from the character data generation unit 114 to determine whether there is a reading error. The character inspection unit 117 outputs the determination result to the result output unit 118.
The odd / even inspection unit 116 and the character inspection unit 117 correspond to inspection units, and as will be described later, the odd / even inspection unit 116 and the character inspection unit 117 read each of the reading result in the forward direction and the reading result in the reverse direction. Based on these determination results, the result output unit 118 outputs the character obtained from the forward reading result or the read data obtained from the reverse reading result, based on the determination result. Alternatively, an error is output to the outside of the magnetic reading device 1.
The central processing unit 11 includes other functional units such as a magnetic head unit control unit that controls the operation of the JIS 2 magnetic head unit 21 and the operation of the ISO magnetic head unit 31, but illustration and description thereof are omitted.

Next, error detection performed by the magnetic reading device 1 will be described. The magnetic reading device 1 performs a peak interval inspection, a horizontal odd / even inspection, and a character inspection.
First, the peak interval inspection will be described.
FIG. 3 is a diagram illustrating an example in which the peak interval detected by the peak interval detection unit 112 is shifted.
In the figure, a solid line L3 indicates an ideal value of an electric signal obtained by reading magnetic data. Points P31 to P37 indicate peak points of the solid line L3. For example, the ideal value (logical interval time) of the peak interval between the point P32 and the point P33 is indicated by time t3. On the other hand, in general, the magnetic reading device has a play in the mechanical mechanism of the magnetic head mounting portion, and this play or the like causes a deviation from the ideal value in the peak interval of the electric signal to be read. This difference in peak interval is often different between reading in the forward direction and reading in the reverse direction. In the example of FIG. 3, the peak interval of the electrical signal output from the JIS2 magnetic head unit 21 is shifted from the ideal value t3 because the peak interval in the forward direction is time t1. Further, the peak interval in the reverse direction is time t2, which is shifted from the logical value t3.

FIG. 4 is a diagram illustrating a criterion for determining a peak interval performed by the peak interval inspecting unit 115.
The peak interval inspection unit 115 stores in advance a logical interval time and a standard range (threshold of deviation between the read peak interval and logical interval time) defined by the JIS2 standard.
When the forward peak interval and the reverse peak interval are input from the peak interval detection unit 112, the peak interval inspection unit 115 first sets each peak interval and logical interval time for each of the forward direction and the reverse direction. The deviation from is calculated. Next, the peak interval inspection unit 115 determines the presence or absence of a reading error for each peak interval in accordance with the criteria shown in FIG.

If the forward and / or backward deviation is within the specification range, it can be expected that the peak interval within the specification range has been detected correctly, and the peak interval can be used to ensure that the data is correct. It can be expected to be restored. Therefore, in this case, the peak interval inspection unit 115 determines that the measurement result of the peak interval is normal.
On the other hand, if both the forward and reverse deviations are out of the standard range, the peak interval detection has failed in both the forward and reverse readings, and restoration is performed using this peak interval. Data is likely to contain errors. Therefore, the peak interval inspection unit 115 determines that the measurement result of the peak interval is abnormal.
The peak interval inspection unit 115 determines that the peak interval inspection result is normal when determining that the measurement result is normal at all peak intervals. On the other hand, when the measurement result is determined to be abnormal at any peak interval, the peak interval inspection unit 115 determines that the peak interval inspection result is abnormal. The peak interval inspection unit 115 outputs the peak interval inspection result to the result output unit 118.
In this way, the peak interval inspection unit 115 can determine whether or not there is a reading error, thereby reducing the reading error.

  Note that the criterion for determining the peak interval performed by the peak interval inspecting unit 115 is not limited to that shown in FIG. For example, when the measurement results are determined to be normal at all peak intervals in the forward direction, or when the measurement results are determined to be normal at all peak intervals in the reverse direction, the peak interval inspection results are determined to be normal, all Information indicating the direction in which the peak interval is determined to be normal may be output to the result output unit 118. In this case, the result output unit 118 can output the character in the direction output from the peak interval inspection unit 115 as a correct reading result when the characters generated in the forward direction and the reverse direction are different, and the reading rate Can be improved.

Next, the horizontal odd-even inspection will be described.
FIG. 5 is a diagram illustrating an example of digital data generated by the digital data generation unit 113.
A solid line L51 in the figure shows an example of an electrical signal that the JIS2 magnetic head unit 21 normally reads and outputs. Points P511 to P517 indicate peak points detected by the peak interval detection unit 112 from the electric signal indicated by the solid line L51. The peak interval detection unit 112 outputs a time interval between peak points.
The digital data generation unit 113 processes the peak intervals output from the peak interval detection unit 112 in the order of data. The “data order” here is a time order in which data is read from the magnetic storage medium in the forward direction, and a reverse order to the time order in which data is read from the magnetic storage medium in the reverse direction. The digital data generation unit 113 determines “0” when each peak interval occupies one bit time in one peak interval, and “1” when two peak intervals occupy 1 bit time. Is determined.
In the example of the solid line L51 in FIG. 5, the digital data generation unit 113 determines that the peak interval between the points P511 and P512 and the peak interval between the points P512 and P513 are “0”, and the points P513 to P515 are determined. Two peak intervals and two peak intervals of points P515 to P517 are each determined as “1”. As a result, the digital data generation unit 113 outputs the bit string “0011”.

On the other hand, a broken line L52 in FIG. 5 shows an example in which the electrical signal output from the JIS 2 magnetic head unit 21 is displaced due to play of the mechanical mechanism of the head mounting portion. Points P521 to P527 indicate peak points detected by the peak interval detection unit 112 from the electric signal indicated by the broken line L52.
In this case, the digital data generation unit 113 determines that the peak interval between the points P521 and P522 is “0”, but erroneously determines that the two peak intervals between the points P522 to P524 are “1”. Subsequently, the peak interval between the points P524 to P526 is determined as “1”, and the peak interval between the points P526 and P527 is erroneously determined as “0”. As a result, the digital data generation unit 113 outputs the bit string “0110”.

FIG. 6 is a diagram illustrating an example of a horizontal odd / even inspection performed by the odd / even inspection unit 116.
A solid line L61 in the figure shows an example of an electrical signal that the JIS2 magnetic head unit 21 normally reads and outputs. Points P611 to P623 indicate peak points detected by the peak interval detection unit 112 from the electric signal indicated by the solid line L51. The digital data generation unit 113 generates a bit string “00110011” from the peak intervals of these peak points.
The odd / even test unit 116 performs the horizontal odd / even test on the block 1 “0011” and the block 2 “0011” with the bit string output from the digital data generation unit 113 as one block every 4 bits. As a result, the odd / even test unit 116 calculates the parity value “0000” and determines that the odd / even test result is normal.

  The odd / even test unit 116 performs a horizontal odd / even test for each of the forward bit sequence and the reverse bit sequence, and outputs the horizontal odd / even test result to the result output unit 118 for each direction. As described above, the odd-even inspection unit 116 performs the horizontal odd-even inspection result for each of the forward reading result and the backward reading result, and generates the character code generated from the reading result in the direction determined to have no error. By outputting the result output unit 118, the reading rate can be improved as compared with the case of reading in one direction.

Further, the magnetic reading apparatus 1 performs a peak interval inspection and a character inspection unit in combination with the horizontal odd / even inspection in order to improve the reading error detection rate.
A broken line L63 in FIG. 6 shows an example in which a deviation occurs in the electrical signal output from the JIS 2 magnetic head unit 21. Points P631 to P643 indicate peak points detected by the peak interval detection unit 112 from the electric signal indicated by the broken line L63. In this case, the digital data generation unit 113 generates a bit string “01100110”. In this bit string, the value of the second bit and the value of the fourth bit of block 1 are erroneously generated due to the bit shift occurring at points P632 to P637. Also, due to the bit shift occurring at points P638 to P643, the value of the second bit and the value of the fourth bit are erroneously generated in block 2 as well.
As a result, the odd / even test unit 116 performs the horizontal odd / even test on the block 1 “0110” and the block 2 “0110”, calculates the parity value “0000”, and determines that the odd / even test result is normal.
As described above, there is a possibility that an error cannot be detected by the horizontal odd-even test even if the bit string includes an error. Therefore, the magnetic reading device 1 performs peak interval inspection and character inspection in addition to the horizontal odd-even inspection to improve the accuracy of error detection.

Next, character inspection will be described. FIG. 7 is a diagram illustrating an example of character inspection performed by the character inspection unit 117.
In the figure, a solid line L7 shows an example of an electric signal read by the JIS 2 magnetic head unit 21 by reading in the forward direction. Points P71 to P77 indicate peak points of the solid line L7.
The character data generation unit 114 generates, for example, a numerical character “03H” from the bit string output from the digital data generation unit 113.
As described above, when there is a character corresponding to the bit string generated by the digital data generation unit 113 from the forward reading result and the character data generation unit 114 can generate the character, the character inspection unit 117 reads the forward reading. Regarding the result, the character inspection result is determined to be normal. On the other hand, when the character data generation unit 114 cannot generate a character, the character inspection unit 117 determines that the character inspection result is abnormal for the forward reading result.
Similarly, when there is a character corresponding to the bit string generated by the digital data generation unit 113 from the reverse reading result and the character data generation unit 114 can generate the character, the character inspection unit 117 reads the reverse reading result. The character inspection result is determined to be normal. On the other hand, when the character data generation unit 114 cannot generate a character, the character inspection unit 117 determines that the character inspection result is abnormal for the reading result in the reverse direction.
In this way, the character determination unit determines whether there is a character corresponding to the bit string for each of the forward direction reading result and the backward direction reading result, and generated from the reading result in the direction determined to exist. By outputting the character code by the result output unit 118, the reading rate can be improved as compared with the case of reading in one direction.

Note that the character inspection method performed by the character inspection unit 117 is not limited to this. For example, if the character generated by the character data generation unit 114 for the forward reading result matches the character generated by the character data generation unit 114 for the reverse reading result, the character inspection result is normal. If the character generated by the character data generation unit 114 differs depending on the reading direction, or if the character cannot be generated from the reading result in any direction, the character inspection result may be determined to be abnormal. In the case of the example in FIG. 7, since the character generated by the character generation unit 114 from the reading result in the forward direction and the character generated from the reading result in the reverse direction are both “03H”, the character inspection unit 117 performs the character inspection. The result is determined to be normal.
As described above, it is possible to further reduce reading errors by determining the identity between the character generated from the forward reading result and the character generated from the backward reading result.

Next, the operation of the magnetic reading device 1 will be described.
FIG. 8 is a flowchart showing a processing procedure in which the magnetic reading device 1 reads magnetic data and outputs a character or error as a reading result. When the magnetic reading device 1 is instructed to start a reading process by inserting a magnetic card or the like, it starts the process.
In step S1, the JIS2 magnetic head unit 21 performs forward reading and reads magnetic data recorded on the magnetic card with an electric signal. The JIS 2 magnetic head unit 21 outputs the read electrical signal to the read result input unit 111.
In step S1, the JIS2 magnetic head unit 21 performs reading in the reverse direction, and reads magnetic data recorded on the magnetic card with an electric signal. The JIS 2 magnetic head unit 21 outputs the read electrical signal to the read result input unit 111.

In step S3, the peak interval detection unit 112 detects the peak position from each of the electrical signal of the forward reading result and the electrical signal of the backward reading result received by the reading result input unit 111, and detects the peak position. The peak interval is detected from the peak position. The peak interval detection unit outputs the detected peak interval to the digital data generation unit 113 and the peak interval inspection unit 115. The peak interval inspection unit 115 compares each of the forward peak interval and the reverse peak interval output from the peak interval detection unit 112 with the logical interval time, and the difference between the peak interval and the logical interval time is determined. Whether or not there is a reading error is determined based on whether or not it is within the standard range.
In step S4, if the peak interval detection unit 112 determines in step S3 that there is an abnormality in the reading result in any direction (step S4: YES), the process proceeds to step S21, and the reading result in any direction is abnormal. If it is determined that there is none (step S4: NO), the process proceeds to step S5.

In step S <b> 5, the digital data generation unit 113 generates digital data from each of the forward peak interval and the reverse peak interval output from the peak interval detection unit 112. The digital data generation unit 113 outputs the generated digital data to the character data generation unit 114 and the odd / even inspection unit 116.
In step S6, the odd / even test unit 116 performs a horizontal odd / even test on each of the forward digital data and the reverse digital data output from the digital data generation unit 113 to determine whether there is a reading error. .
In step S7, when the odd / even inspection unit 116 determines in step S6 that the digital data generated from the reading result in any direction is abnormal (step S7: YES), the process proceeds to step S21, and any direction is determined. If it is determined that there is no abnormality in the digital data generated from the reading result (No in step S7), the process proceeds to step S8.

In step S8, the character data generation unit 114 generates a character from each of the forward digital data and the reverse digital data output from the digital data generation unit 113. The character data generation unit 114 outputs the generated character to the character inspection unit 117 and the result output unit 118. In addition, the character inspection unit 117 performs character inspection for determining whether or not to generate a character for each of the forward direction character and the reverse direction character output from the character data generation unit 114, and determines whether or not there is a reading error. .
In step S9, if the character inspection unit 117 determines in step S8 that a character cannot be generated from the reading result in any direction (step S9: YES), the process proceeds to step S21, and the character is detected from the reading result in any direction. If it is determined that it can be generated (step S9: NO), the process proceeds to step S10.

In step S10, the result output unit 118 determines that, out of the characters output from the character data generation unit 114, the odd / even inspection unit 116 determines that there is no abnormality, and the character inspection unit 117 determines that the character can be generated. Any character generated from the reading result is output to the outside of the magnetic reading device 1. Thereafter, the process of outputting the character or error of the reading result is terminated.
In step S <b> 21, the result output unit 118 outputs an error as a reading result to the outside of the magnetic reading apparatus 1. Thereafter, the process of outputting the character or error of the reading result is terminated.
The processing procedure performed by the magnetic reading device 1 is not limited to that shown in FIG. For example, the magnetic reading device 1 may execute the peak interval inspection in step S3, the odd / even inspection in step S6, and the character inspection in step S8 in parallel. Alternatively, based on the bit string generated by the digital data generation unit 113 in step S5, the peak interval inspection unit 115 divides the electric signal output from the JIS2 magnetic head unit 21 into blocks of 4 bits, and the step is performed for each block. You may make it perform the peak space | interval test | inspection of S3.

  As described above, the magnetic reading device 1 performs the peak interval inspection, the horizontal odd-even inspection, and the character inspection for each of the forward reading and the backward reading, so that the forward reading and the backward reading are performed. When an error is detected for only one of these, the reading result in the direction determined to be normal can be used to reduce reading errors and increase the reading rate. Further, the error detection rate can be increased by comparing the result of the forward reading and the result of the backward reading.

A program for realizing all or part of the functions of the central processing unit 11 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. You may perform the process of each part. Here, the “computer system” includes an OS and hardware such as peripheral devices.
Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.

  The present invention is suitable for use in a magnetic reading apparatus, a magnetic reading method, and a program for restoring data based on the peak interval of an electrical signal read from magnetic data. For example, it can be used in an apparatus that reads data from a magnetic card, such as ATM (Automated Teller Machine).

DESCRIPTION OF SYMBOLS 1 Magnetic reader 11 Central processing part 21 JIS2 Magnetic head part 31 ISO magnetic head part 41 Memory part 111 Reading result input part 112 Peak interval detection part 113 Digital data generation part 114 Character data generation part 115 Peak interval inspection part 116 Odd / even inspection part 117 Character inspection unit 118 Result output unit

Claims (3)

A magnetic reading device for reading data from a magnetic recording medium on which data is recorded by a frequency modulation method,
A magnetic head for moving the magnetic head relative to the magnetic recording medium in the forward and reverse directions, reading magnetic data in each of the forward and reverse directions and outputting an electrical signal;
A character data generator for generating a character for each of the electrical signal of magnetic data read by moving the magnetic head relative to the forward direction and the electrical signal of magnetic data read by moving the magnetic head relative to the reverse direction; ,
Whether or not there is a reading error is determined for each of the magnetic data electrical signals read by moving the magnetic head relative to the forward direction and the magnetic data electrical signals read by moving the magnetic head relative to the reverse direction. A determination unit;
Based on the determination result of the determination unit, the character generated from the electrical signal of the magnetic data read by moving the magnetic head relative to the direction determined as having no reading error is output, and the character is read in any direction. When it is determined that there is an error, a result output unit that outputs an error;
A peak interval detector for detecting a peak interval of an electrical signal output from the magnetic head unit;
A peak interval inspection unit that determines the presence or absence of an abnormality by comparing the peak interval with a logical interval time determined from the standard of magnetic data;
A digital data generator for generating digital data of a bit string from the peak interval;
Comprising
The character data generation unit generates a character from the digital data,
The determination unit
An odd / even test unit that performs an odd / even test on the digital data and determines whether or not there is an abnormality for each of the forward reading and the backward reading;
A character inspection unit that determines whether or not there is an abnormality for each of the forward reading and the backward reading based on whether or not the digital data can be converted into the character;
Comprising
Based on the determination result of the peak interval inspection unit, the determination result of the odd / even inspection unit, and the determination result of the character inspection unit, the result output unit is configured so that the character data generation unit Output either the generated character, the character generated by the character data generation unit from the reading result in the reverse direction, or an error.
A magnetic reader characterized by that. A magnetic reading method of a magnetic reading device for reading data from a magnetic recording medium on which data is recorded by a frequency modulation method,
A reading step of moving a magnetic head relative to a magnetic recording medium in a forward direction and a reverse direction, reading magnetic data in each of the forward direction and the reverse direction, and outputting an electrical signal;
A character data generation step of generating a character for each of the electrical signal of magnetic data read by relative movement of the magnetic head in the forward direction and the electrical signal of magnetic data read by relative movement in the reverse direction; ,
Whether or not there is a reading error is determined for each of the magnetic data electrical signals read by moving the magnetic head relative to the forward direction and the magnetic data electrical signals read by moving the magnetic head relative to the reverse direction. A determination step;
Based on the determination result in the determination step, the magnetic head is relatively moved in the direction determined as having no reading error, and a character generated from the electrical signal of the magnetic data read is output in any direction. A result output step for outputting an error when it is determined that there is a reading error;
A peak interval detection step of detecting a peak interval of the electrical signal output in the reading step;
A peak interval inspection step for determining the presence or absence of abnormality by comparing the peak interval with a logical interval time determined from the standard of magnetic data;
A digital data generation step of generating digital data of a bit string from the peak interval;
Comprising
In the character data generation step, a character is generated from the digital data,
In the determination step,
Performing an odd / even test on the digital data, and determining whether there is an abnormality for each of the forward reading and the backward reading;
A character inspection step for determining whether there is an abnormality for each of the forward reading and the backward reading based on whether the digital data can be converted into the character;
Run
In the result output step, based on the determination result in the peak interval inspection step, the determination result in the odd / even inspection step, and the determination result in the character inspection step, the character data is obtained from the forward reading result. Output either the character generated in the generation step, or the character generated in the character data generation step from the reading result in the reverse direction, or an error.
Magnetic reading method characterized by the above. The magnetic head is moved relative to the magnetic recording medium in which data is recorded by the frequency modulation method in the forward direction and the reverse direction, and the magnetic data is read out in the forward direction and the reverse direction, respectively. A program for generating characters,
A character that generates a character for each of an electrical signal of magnetic data read by moving the magnetic head relative to the forward direction and an electrical signal of magnetic data read by moving the magnetic head relative to the reverse direction. A data generation step;
The computer causes the magnetic head to read each of the magnetic data read by moving the magnetic head relative to the forward direction and the electric signal of the magnetic data read by moving the magnetic head relative to the reverse direction. A determination step for determining presence or absence;
Based on the determination result in the determination step, the computer outputs a character generated from an electrical signal of the magnetic data read by relatively moving the magnetic head in a direction determined to have no reading error, A result output step for outputting an error when it is determined that there is a reading error also in the direction of
A peak interval detecting step in which the computer detects a peak interval of an electrical signal output in the reading step;
A peak interval inspection step in which the computer determines whether or not there is an abnormality by comparing the peak interval with a logical interval time determined from a magnetic data standard;
A digital data generating step in which the computer generates digital data of a bit string from the peak interval;
To the computer,
In the character data generation step, the computer generates a character from the digital data,
In the determination step,
Performing an odd / even test on the digital data, and determining whether there is an abnormality for each of the forward reading and the backward reading;
A character inspection step for determining whether there is an abnormality for each of the forward reading and the backward reading based on whether the digital data can be converted into the character;
To the computer,
In the result output step, based on the determination result in the peak interval inspection step, the determination result in the odd / even inspection step, and the determination result in the character inspection step, the computer reads from the forward reading result. A program for outputting either the character generated in the character data generation step, the character generated in the character data generation step from the reading result in the reverse direction, or an error .

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