JP3368348B2 - Media processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium processing device such as a magnetic reading device for decoding magnetic data recorded on a magnetic card by a predetermined decoding method. 2. Description of the Related Art In a conventional magnetic reading apparatus, for example, when a magnetic recording system of a recording medium is an F2F recording system, magnetic data of recording is magnetically inverted at a predetermined frequency.
This is read by a magnetic head, and the analog signal is detected as a magnetic flux reversal position based on a change in potential, and a magnetic flux interval (frequency) is detected.
Is detected, and each magnetic flux interval is determined based on the set sampling time and decoded. For this purpose, the above-described magnetic reading apparatus includes a sampling time generating means for generating the above-described sampling time in the apparatus, a decoding means, and a decoding result validity judging means. Are transmitted to an external device, for example, a data processing unit such as a main CPU, with the result of the determination and, when the determination is correct, the read data added. There are two types of decoding methods based on the sampling time described above: a fixed-length decoding method (a method of setting the sampling time to be constant), and two methods of this method, a forward direction and a reverse direction. A method in which the magnetic flux reversal time of the bit immediately before the read bit is used for the sampling time), and also in this method, there are two methods, a forward direction and a reverse direction. However, whichever method is adopted, if the magnetic data is not correctly read at the first reading, there is a problem that the recording medium must be transported again and read again. Further, each of the above-mentioned systems has the following problems. That is, in the fixed-length decoding method including the forward direction and the reverse direction, the output interval of the magnetic data varies and the reading failure occurs due to a writing failure of the recording medium and a variation of the transport speed. In the variable length decoding method including the forward direction and the reverse direction, the sampling sampling read is out of synchronization due to noise at the time of writing and noise at the time of reading, and a reading error occurs. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and re-decodes a recording medium without re-reading when a decoding error occurs, thereby covering the problems of various decoding systems. In addition to improving read errors, increasing the accuracy of data verification (checking the writing standard accuracy) after writing on the recording medium, and recording data recorded by another data reader / writer using any decoding method Even if the recording medium has been data-verified by the present apparatus, the medium can be read even if any data reader / writer employs any decoding method. It is intended to provide a processing device. [0007] [Means for solving problems] The inventions, converting a read write unit for reading writing data to the recording medium, the data of the data which the read and write means is read from the recording medium time A decoding means having a plurality of forward and reverse decoding schemes; and decoding the time-converted data read from the recording medium stored in the storage means by the decoding means using the decoding scheme. A medium processing device including a determination unit that enables a write determination when decoding can be performed by the system. [0008] [act] According to the inventions of the medium processing apparatus, converts the data in the recording medium read by the read-write unit on the time data stored in the storage means, decoding means the data in this that the stored time Are decoded by the forward and reverse decoding methods, and the data verification is good when the determination means outputs both forward and reverse determinations. According to the present invention, since the read data is converted into time data and decoded, when decoding is performed again due to bad decoding, the stored data can be processed. Further, it is not necessary to read the recording medium again, so that the control is simplified and the processing time is shortened. As a result of decoding the stored data, even if the decoding method has a forward direction or a backward direction, it can be dealt with only by rearranging the data.
All decoding methods can be adopted. [0011] thing, data verification in the apparatus of this OK
Since the data verification is OK in both the forward decoding and the reverse decoding, the recording medium can be read regardless of the decoding method adopted by another reader / writer, and the reader / writer is specified. It is versatile without having to do it. An embodiment of the present invention will be described below in detail with reference to the drawings. The drawing shows a reading device for reading magnetic data of a magnetic card as a recording medium, and in FIG.
The card 10 has a magnetic stripe capable of magnetic recording,
The card 10 is transported on a transport line 11 formed by a transport belt and guide rollers and controlled by a motor. A magnetic sensor H0 for detecting the presence of a magnetic stripe of the card 10 is provided near the card insertion slot at the start end of the transport line 11, and the card 10 is detected at a predetermined position on the transport line 11. Photoelectric sensors S0, S
1, S2, S3, S4, and a photoelectric sensor S
At a position 3, a magnetic head 12 capable of writing and reading magnetic data to and from a magnetic stripe of the card 10 is provided. Further, a shutter 13 is provided at a stage subsequent to the photoelectric sensor S1, and a card 1 having a magnetic stripe is provided.
Opened when zero insertion is detected. FIG. 2 shows a control circuit block diagram of the reader. For example, if the reader is a device incorporated in a device such as an automatic teller machine for banking or a vending machine for goods, such a device is used. The apparatus includes a CPU 15 serving as a slave CPU, and the CPU 15 drives and controls each circuit device according to a program stored in a ROM 16,
The RAM 17 stores data necessary for control in a readable manner. The card detecting section 18 is provided with the magnetic sensor H described above.
0, comprising photoelectric sensors S0 to S4, and outputs a signal detecting the card 10 at each position. The shutter drive unit 19 drives the shutter 13 to open and close,
Numeral 0 controls the drive of a transport line 11 formed by a transport level and guide rollers and driven by a motor. As shown in FIG. 3, the magnetic flux reversal time meter side section 21 detects the magnetic flux reversal (b) from the potential change of the read signal (a) read by the magnetic head 12, and detects the time of the reversal interval. Is measured. In this measurement, a sampling clock (C) generated by the sampling clock generating unit 22 is measured during magnetic flux reversal, and a measurement value (time, μs) obtained by multiplying the count value by a period of the sampling clock (d)
It is. At the same time, the number of magnetic flux reversals (e) is counted, and a decoded result is also obtained from the measured value and the counted value. As shown in FIG. Stored in the area.
The magnetic recording of the card 10 in this embodiment is
The 2F recording method is adopted. In FIG. 2, a transmission controller 23 connects the magnetic card reader to an external controller 24 such as a main CPU of the data processor to transmit and receive read data. In order for the CPU 15 to decode the read data, the ROM 16 stores programs for the fixed-length decoding method in the forward and reverse directions and the variable-length decoding method for the forward and reverse directions. ing. FIG. 5 shows decoding of normal read data and its broken data. For normal data (a), both the fixed-length decoding method and the variable-length decoding method use the forward direction (b) and the reverse direction (c). ), The forward abnormal data (d) indicates an inversion delay abnormality at two locations. In such an inversion delay, the decoding in the forward direction is determined to be abnormal data. In the decoding (e), decoding can be performed as normal data. Further, in the reverse direction abnormal data (f), two places show abnormalities in which the reversal is rapid, and in such an inversion proceeding, the decoding in the reverse direction is determined to be abnormal data.
However, in the forward decoding (g), decoding can be performed as normal data. In the forward / reverse abnormal data (h), the abnormalities of the inversion delay and the inversion of the inversion are shown.
In the case of such an abnormality, decoding becomes impossible. FIG. 6 shows a flowchart of the read decoding process of the CPU 15 shown in FIG. 2. When the card 10 is inserted, the magnetic sensor H0 detects the presence of the magnetic stripe of the card 10, and the photoelectric sensor S0 detects the presence of the magnetic stripe. Card 1
When the insertion of 0 is detected, the shutter drive unit 19 is driven to open the shutter 13, and at the same time, the transport drive unit 20 is driven to drive the transport line 11 in the loading direction, and the photoelectric sensor S3 detects the card 10. In synchronization with the above, the magnetic head 12 reads magnetic data (step n1). As described with reference to FIG. 3, the magnetic flux reversal time meter side section 21 outputs the read signal (a) read by the magnetic head 16.
Magnetic flux inversion (b) is detected from the change in the potential, and the time of this inversion interval is measured by the sampling clock (c) generated by the sampling clock generation unit 22 (time, μs)
Further, the magnetic flux reversal number (e) is also counted, and the magnetic flux reversal time measurement value and the magnetic flux reversal count value are stored in a RAM.
17 (steps n2, n
3). In order to decode the read data, the processing order of the forward and reverse directions of the fixed length decoding system and the forward and reverse directions of the variable length decoding system are set in advance. When the method is set, decoding is performed in the forward direction of the setting method, for example, the fixed-length decoding method (step n4). Next, the magnetic flux reversal time measured value and the magnetic flux reversal count value are read from the RAM 17 (step n).
5) Decode is performed by the set method described above, and it is determined whether or not decoding is OK by a predetermined check method such as a parity check (step n6). If the reading is OK, the decoding is terminated without executing the decoding by another decoding method.
The decoding result is stored in a predetermined area of the RAM 17, and the decoding result is transmitted to the external control unit 24 via the transmission control unit 23 (step n7). However, if the decoding is NG, the next decoding method is set (step n8), and step n5
Return to If the decoding method is the reverse direction from the previous direction, for example, if the previous time is the forward direction and the current time is the reverse direction, or if the previous time is the reverse direction and the current time is the forward direction, the direction is determined in step n5. The decoding process is executed by rearranging the data in accordance with. As described above, decoding is executed in the order of the set decoding method. If decoding is OK, decoding is terminated at that point. If (step n9),
As a reading error (step n10), the process ends. In the above processing, since the read data is converted into time data and decoded, when decoding is defective and decoding is performed again, processing can be performed with the stored data. There is no need to read, the control is simplified and the processing time is reduced. As a result of the decoding process using the stored data, even if the decoding method has a forward direction or a backward direction, it can be dealt with only by rearranging the data.
All decoding methods can be adopted. Further, if the decoding can be performed by any one of a plurality of decoding methods, and the reading judgment is made possible, the problems of each decoding method can be covered by the mutual method, and the reading defect can be improved. And the like. FIG. 7 shows a card 10 on which magnetic data has been written.
6 shows a flowchart of the data verifying execution process. Steps n11 to n15 are the same as steps n1 to n5 in FIG. That is, the measured value of the magnetic flux reversal time and the counted number of magnetic flux reversals are read out from the RAM 17 and the set first
Then, it is determined whether the decoding is OK by a predetermined check method such as a parity check (step n16). If the decoding is NG, the decoding is terminated without executing the decoding by another decoding method, the writing of the magnetic data to the card 10 is determined to be an error, and the processing is ended ( Step n1
7). However, if the first decoding is OK, the next decoding method is set (step n18).
It returns to step n15. When the decoding method is the reverse direction to the previous direction, for example, when the previous time is the forward direction and the current time is the reverse direction, or when the previous time is the reverse direction and the current time is the forward direction, the direction is determined in step n15. The decoding process is executed by rearranging the data in accordance with. As described above, decoding of all the systems is executed in the order of the set decoding system, and
If K, the card data verify is determined to be OK and the process is terminated (steps n19 and n20).
However, if at least one of the decoding methods is NG, the decoding is terminated at that time, the writing of the magnetic data to the card 10 is determined to be an error, and the processing is terminated (step n17). When the processing is performed as described above, the data verify OK recording medium can be read by this apparatus even if another reader / writer adopts any decoding method, and there is no need to specify the reader / writer. It has versatility. In correspondence between the configuration of the present invention and the embodiment, the recording medium of the present invention corresponds to the card 10 of the embodiment, and similarly, the writing / reading means is the magnetic head 12.
The storage means corresponds to the RAM 17, the decoding means corresponds to the ROM 16 or the RAM 17, and the judgment means corresponds to the judgment processing of the CPU 15. However, the present invention has only the configuration of the above-described embodiment. However, the present invention is not limited to this.

[Brief description of the drawings] FIG. 1 is a schematic configuration diagram of a reading device. FIG. 2 is a control circuit block diagram of a reading device. FIG. 3 is an explanatory diagram of reading data. FIG. 4 is an explanatory diagram of data storage. FIG. 5 is an explanatory diagram of data abnormalities. FIG. 6 is a flowchart of a decoding process. FIG. 7 is a flowchart of a tecode process. [Explanation of symbols] 10 ... Card 12 Magnetic head 15 ... CPU 16 ... ROM 17 ... RAM

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-37876 (JP, A) JP-A-58-6515 (JP, A) JP-T8-509089 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G11B 20 / 18,20 / 10 G06K 19/00

Claims (1)

(57) [Claim 1] Read / write means for reading / writing data from / to a recording medium, and convert the data read from the recording medium by the read / write means into time data and store it. A decoding means having forward and reverse decoding methods, and a time conversion data read from a recording medium stored in the storage means, decoded by the decoding means by the decoding method, and can be decoded by all methods. A medium processing device comprising: a determination unit configured to determine whether writing can be performed.