JPS5814702B2 - Transaction processing devices that use magnetic media - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to transaction processing apparatuses such as automatic teller machines and automatic deposit machines, and particularly relates to the inspection of magnetic media such as magnetic cards used therein.

The transaction processing device described above reads transaction information such as a personal identification number, account number, and balance from a magnetic card inserted by the customer, executes a transaction of the amount or type specified by the customer on the operation panel, and Updated information after a transaction is written on a magnetic card and returned to the customer.

On the other hand, the information on the above magnetic card is generally stored using frequency modulation method (
FM format), and includes a data signal and a clock signal on the same channel.

In this recording method, if there is magnetization reversal at the center of a pit cell, which is a unit recording area, the information is "1", otherwise it is "0", and magnetization reversal always occurs at the boundary of each pit cell, which becomes the clock signal. be.

Then, based on the clock signal, a window with a width of, for example, 4 is created between bit cells, and whether the information is "1" or "0" is determined depending on whether or not a reproduced signal exists within this window.

Incidentally, the recording format of a magnetic card is generally as shown in FIG.

In the figure, 1 is a magnetic card having a magnetic stripe 1a, 2 is a synchronization area where only clock information is recorded,
3 is a personal authentication number, bank code,
A data area 6 is a check code in which transaction information such as account number and deposit balance is recorded.

FIG. 2 is a waveform diagram illustrating reproduction of data at the beginning of the magnetic card 1 having the above format.

a indicates the recording mode on the magnetic stripe 1a, A corresponds to magnetization reversal, T corresponds to a bit cell, and represents the section delimited by the above A.

b is the reproduced signal of a, the clock signal always occurring at the boundary of the section T, and the data signal occurring at the center of the section T.

C is a window generated based on the clock signal, and its width is set to, for example, η of the interval T.

The width of this window is variable for each bit based on the preceding bit period in order to avoid being affected by the fixed data reproduction method and fluctuations in the relative speed between the magnetic medium and the magnetic head. There are defined data playback methods, and currently operating transaction processing devices are not unified as to which data playback method to use.

In conventional transaction processing devices, when a transaction is completed, updated data is written in a predetermined format, the updated data is reread and compared with the written data, and if the result is positive, the magnetic card is returned and the transaction is completed.

However, a magnetic card that can be read normally by one transaction processing device may result in a reading error in another transaction processing device, and the transaction may not be executed.

The main reasons for this are the difference in data reproduction methods and abnormal bits on the magnetic medium.

For example, in a transaction processing device that adopts the former data reproduction method described above, if a magnetic card 1 with an abnormal bit in the synchronization area 2 is read, there is a possibility that this abnormal bit will be determined as "1" before the start code is detected. However, only a certain number of bits “
Unless there are consecutive 1's, it is not determined as a starting code, so if there is a 0 bit in the middle, a position deviated from the normal position will not be mistakenly read as a data area.

However, when this magnetic card 1 is used in a transaction processing device that adopts the latter of the data reproducing methods described above, the synchronization area 2
Due to the abnormal bit in the middle of , the width of the subsequent window is expanded or shortened, and subsequent clock information is mistakenly determined as data, information that is not the actual starting code is detected as the starting code, and subsequent reading The data cannot be guaranteed as additional information.

In this way, conventionally, if an abnormal bit exists in the synchronization area of a magnetic medium due to abnormal writing, scratches, dust, etc., a certain transaction processing device can read and write normally and pass the written data verification check. Other transaction processing devices become out of synchronization and suffer from read errors, resulting in transactions being impossible, resulting in decreased customer service and customer confidence in the transaction processing device.

In view of the above-mentioned actual situation of transaction processing devices that use magnetic media, the present invention prevents the above-mentioned accidents related to magnetic media by detecting synchronization loss caused by abnormal bits existing in the synchronization area. It is something.

The present invention will be described in detail below with reference to the drawings.

FIG. 3 is a block diagram showing essential parts of an embodiment of the present invention, and FIG. 4 is a flowchart for explaining the operation of the embodiment of the present invention.

The transaction processing device determines whether the transaction is possible based on the transaction information on the magnetic card 1 and the transaction information input by the customer, and if it is determined that the transaction is possible, the transaction processing device processes the data area 3 of the magnetic card 1 according to the transaction details requested by the customer. Update the record information in.

The operation of the transaction processing apparatus of the present invention during this record update will be explained with reference to FIGS. 3 and 4. First, the magnetic head 7 performs an operation to write updated data.

Update data is stored in the write data storage device 8 by a control device (not shown), and a write/read control circuit 9 causes current to flow through the magnetic head 7 in accordance with the data read out from the storage device 8.

When writing of the updated data is completed, the magnetic card 1 is returned to its original position and the data that has just been written is reread.

At first, only the clock information is reproduced, but later the data information indicating the first code 4 is reproduced.

The starting code 4 is represented by, for example, N consecutive bits whose data is "1".

Therefore, when n "1" bits are successively reproduced, it is determined to be a starting code.

The reproduction signal from the magnetic head 1 is sent to the write/read control circuit 9.
The data is transferred to a start sign detection circuit 10 and a mark bit counter 11 which counts bits of "1".

When the start code 4 is detected by the start code detection circuit 10, the count value of the mark bit counter 11 is transferred to the synchronization loss detection circuit 12.

The out-of-sync detection circuit 12 determines whether or not the counted value matches a preset value n. If it matches, the output is set to "0", and if it does not match, it detects an abnormality prior to the first sign. Assuming that the bit was present, a desynchronization flag is set and the output is set to "1".

On the other hand, the reading operation continues regardless of whether synchronization is lost or not, and the reproduced data after the first code is read from the read data storage device 1.
3 is stored.

When the end code 5 and the check code 6 are read to end the reading operation, the data collation circuit 14 collates the data stored in the additional data storage device 13 and the write data stored as is in the write data storage device 8. .

If the two match as a result of the comparison, a match signal is output, and if they do not match, a mismatch signal is output.

If there is a mismatch, the transaction processing device will subsequently perform error processing,
Notify of transaction suspension or write operation abnormality.

If they match, the AND gate 15 is used to check whether the out-of-synchronization flag is set.

If the synchronization failure flag is not set, the write operation is performed normally and there is no abnormal bit in the synchronization area 2 of the magnetic card 1, and the transaction is completed, and the magnetic card 1 is returned or the money is transferred. Entering and exiting etc.

If the out-of-synchronization flag is set, the output of the AND gate 15 will be “1”, and this output will be sent to the journal.
It is supplied to the receipt printing section 16 and the display section 17.

The journal/receipt printing unit 16 prints special symbols and words on the journal and receipt along with additional record information.
In addition, the display section 17 provides a display to notify of an abnormality in the magnetic card 1.

After performing the operation to notify the abnormality of the magnetic card 1 in this way, the transaction processing device executes exactly the same processing as when no synchronization failure occurs, and returns the magnetic card 1 and deposits and withdraws money.

The customer sees an abnormality in the magnetic card 1 by looking at the magnetic card 1 or the receipt ejected together with the money, or by looking at the display section 17, and reports the fact to the operator of the transaction processing device.

The operator looks at the customer's notification or the transaction record left on the journal paper and takes steps to reissue the corresponding magnetic card.

It should be noted that it is not necessary to use all of the journal paper, the receipt, and the display section as in this embodiment as means for notifying the abnormality of the magnetic card 1, and any one of them or other means may be used.

Furthermore, the written data verification check may be performed by checking the number of digits without verifying the data one by one.

Furthermore, the magnetic medium used is not only a magnetic card but also a passbook with a magnetic stripe attached to achieve the same effect.

Further, in the above embodiment, the update information write operation is performed only once, but if an error occurs as a result of data verification, the write operation may be retried one or more times.

If the data verification check is satisfied as a result of the retry, processing to conclude the transaction is executed, and if an error occurs, the same processing as in the above embodiment is performed.

As described above, according to the present invention, in a transaction processing device that uses magnetic media, accidents such as a case where a reef air medium that can be used in one transaction processing device cannot be used in another transaction processing device and transactions cannot be performed can be avoided. This has the effect of improving customer service and increasing the customer's confidence in the device.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a magnetic card used in the present invention, FIG. 2 is a waveform diagram illustrating reproduction of recorded data, and FIG. 3 is a block diagram showing main parts of an embodiment of the present invention. FIG. 4 is a flowchart showing the operation in one embodiment of the present invention. 1...Magnetic card, 2...Synchronization area, 3...Data area, 4...Start code, 5...End code, 6...Check code, 7...Magnetic head, 8...Write data storage device , 9...Writing/reading control circuit, 10...Starting code detection circuit, 11...Mark bit counter, 12...
Synchronization loss detection circuit, 13...Write data storage device,
14...Data collation, circuit, 15...Journal/receipt printing section, 16...Display section.

Claims (1)

[Claims] 1. In a transaction processing device that reads transaction information such as a personal identification number, account number, and balance from a magnetic medium such as a magnetic card, and writes update information to the magnetic medium to execute a transaction requested by a customer, the magnetic medium After writing updated information to the magnetic medium, the magnetic medium is read again, and if a synchronization loss is detected and a satisfactory result is obtained from the verification of the written information and the read information, processing is executed to complete the transaction. A transaction processing device characterized in that it notifies a customer or an operator of the transaction processing device of an abnormality in a magnetic medium.