JPH11328882A - Magnetic data reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve abnormality by once storing the waveform width data obtained by reading from tacks in case of the occurrence of a reading abnormality during the course of reading and analyzing the stored waveform width data toward a transportation start end from a transportation termination end, then executing rereading. SOLUTION: A magnetic recording medium C of a passenger ticket, etc., is transported by a transporting mechanism. A read head H reads the data recorded on tracks. A signal forming circuit 1 outputs the waveform width signal of the kind meeting the recording system of the tracks and a host CPU executes the processing of entrance, exit, etc., in accordance therewith. In case of the occurrence of the reading abnormality, the waveform width data obtd. thus far and the subsequent waveform width data are stored into the memory of a CPU 2 for tracks. The stored waveform width data over the entire part of the tracks is analyzed backward from the transportation termination side toward the transportation start end side, by which the rereading is executed. When the normal data is thereby obtd. the host CPU executes the processing of the entrance, exit, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic data reading apparatus for reading data recorded on a magnetic information recording medium such as a ticket by an FM system or an MFM system, and more particularly, to a reading error detecting method. It relates to a device that can prevent occurrence.

[0002]

2. Description of the Related Art A magnetic data reading device incorporated in a conventional automatic ticket gate and the like uses a read head while a magnetic information recording medium such as a ticket inserted into a main body of the magnetic data reading device is being conveyed. The magnetic data recorded on the track of the magnetic information recording medium is read, and the waveform width of the magnetic data is detected by the signal generation circuit composed of the hybrid IC. It is configured to be converted to “0”.

[0003]

However, the above-mentioned conventional magnetic data reading apparatus has a problem that even if magnetic data is normally recorded (encoded) on the magnetic information recording medium, the conveyance system may have uneven conveyance or sudden occurrence. Variations (jitter) in the waveform width (bit interval) due to static noise, etc., cause poor reading, and if the magnetic information recording medium is a ticket, entry / rejection is refused even though it is a normal ticket There were drawbacks.

In order to prevent reading errors as much as possible, a track on which magnetic data is recorded is divided into two in the transport direction, and the same data is recorded in each of the two divided parts. When data is read, it is also adopted that predetermined arithmetic processing such as entry and exit can be performed based on the read data, but in this case, a program for processing the divided data is required, There is a disadvantage that software becomes complicated.

Further, as described above, two tracks
In the case of having divided magnetic data, a predetermined number of bits including a null (NUL) interposed between the two data (for example,
The next data synchronization processing is performed by detecting "24""0". However, if the data recording method is the MFM method, if even a single detection error occurs, the reliability of subsequent data is lost. In addition, there is a disadvantage that the synchronization process is not performed.

That is, when the data recording system is the MFM system, data analysis is performed with the reference value of "2" in the 2: 3: 4 ratio of the waveform width. There is a disadvantage that the reference value fluctuates, and the reliability of data analysis based on the reference value is impaired.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to make it possible to remedy even if an abnormality occurs during data reading, and to prevent reading defects as much as possible. To provide a magnetic data reading device capable of reading data.

[0008]

In order to achieve the above object, a magnetic data reading apparatus according to the present invention sequentially reads data recorded on a track provided along a transport direction of a magnetic information recording medium. A reading means for reading data recorded on the magnetic information recording medium based on sequentially obtained waveform width data when reading from the transport start end side of the track toward the transport end side thereof, When a reading error occurs during reading, storage means for storing waveform width data obtained by reading from the track, and analyzing the stored waveform width data from the transport end side to the transport start side to analyze the waveform width data. Re-reading means for reading data recorded on a magnetic information recording medium;
It is characterized by having. The track is divided into two parts, and the same data is recorded in each part.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a magnetic data reader according to an embodiment, and FIG. 2 is a front view of a magnetic information recording medium.

Although only one read head H is shown here, when a plurality of tracks T are provided on a magnetic information recording medium C such as a ticket, each track T,
T ... Therefore, the magnetic information recording medium C
When a plurality of tracks are provided in the read head H, a plurality of head elements having coils corresponding to the plurality of tracks T, T... And a signal generation circuit 1 described later.
And the track CPU 2 are provided for each track T, T. In FIG. 2, to simplify the drawing, 1
Only the tracks T are shown. In this track T, d1 and d2 shown on the transport start end and the transport end side are a plurality (for example, 4 or 8) of read / write bits for synchronizing data reading. , Intermediate D indicates predetermined data such as a boarding section.

The track T of the magnetic information recording medium C has F
Predetermined data such as a boarding section is recorded in the M or MFM system. Therefore, when a signal generated when the track T of the magnetic information recording medium C is read via the read head H is processed by the signal generation circuit 1, the track T
When recording is performed in the M system, two waveform width outputs having a waveform width ratio of 1: 2 are obtained. Also, the track T has M
When recorded by the FM method, the waveform width ratio is 2: 3:
4 (1: 1, 5: 2) are obtained with three types of waveform widths.

The signal generation circuit 1 is formed of a hybrid IC, and after performing signal processing such as amplification, outputs the obtained output signal to the truck CPU 2.

As described above, the truck CPU 2
It is provided for each track of the magnetic information recording medium C.
The track CPU 2 uses a magnetic data width detection circuit 2a for detecting the waveform width, and the read data as "1" and "0" with the waveform width having the smallest waveform width ratio (minimum waveform width) as a reference value. And a data processing circuit 2b for reading the data by converting the data into a data.

Hereinafter, the control operation of data reading will be described with reference to the flowchart of FIG.

When the magnetic information recording medium C is inserted into the main body of a magnetic data reader (not shown), the magnetic information recording medium C
Are transported via a transport mechanism (not shown), and reading of data recorded on the track T by the read head H is started (Yes at Step 100; hereinafter, the step is referred to as “S”).

When data reading is started, the signal generation circuit 1
From the type corresponding to the system recorded on the track T of the magnetic information recording medium C (two types in the case of the FM system, MF
Three types of waveform widths (width in FIG. 2 in the case of the M system) are output, and data reading is sequentially performed based on the output (S102).

During data reading, when data reading of the entire track T is completed without a reading error occurring, that is, when reading is normally performed (S10).
(4 negative, S105 affirmative), and based on the read data, the host CPU (not shown) performs predetermined arithmetic processing such as entry and exit (S112).

If a reading error occurs due to jitter or sudden noise while reading the data of the track T (Yes at S204), the data including the waveform width data obtained up to that time will be obtained in the future. The waveform width data is stored in a memory (not shown) of the data processing circuit 3a (S106).

After all the data (waveform width data) of the track T has been stored in the memory,
That is, the data is analyzed from the data on the transport end side of the track T, and the data reading is restarted (S108).

When reading is performed normally by the rereading of data, predetermined arithmetic processing is performed based on the read data (Yes at S110, S112). By rereading the data, most information recording media can be rescued.

Of course, if a reading error occurs even in the above-described re-reading, there is an abnormality in the data recording state on the track T, and when the information recording medium C is a ticket, the processing is performed by an attendant ( S110 No, S114).

As described above, when an error occurs during reading, data analysis is performed from the reverse direction of the track T.
The occurrence of poor reading can be prevented beforehand, and when the information recording medium is a ticket, the ticket gate processing efficiency can be improved.

FIG. 4 shows an information recording medium C 'in which a track T is divided into two parts, and two identical data (first data D1 and second data D2 in the illustrated example) are recorded in each part. Although one track T is shown in FIG. 4, a plurality of tracks T may be provided as in the case of the information recording medium C in FIG.

Thus, even when one track T has two identical data (D1, D2),
If an abnormality occurs during the reading of the first data D1, the data (waveform width data) of the entire track T is stored in the memory, as described above. Then, the data stored in the memory is analyzed in the opposite direction (Yes in S104, S106, S108 in FIG. 3).

That is, when one track T has the same two data, the magnetic data reading apparatus according to the present invention processes the two data D1 and D2 in the same manner as in the related art. Re-reading can be easily performed without requiring software) and without generating a synchronization command signal by detecting a null (NUL) d '.

[0026]

According to the magnetic data reading apparatus of the present invention, when data is read from the transport start end to the transport end of the track, the data is recorded on the magnetic information recording medium based on the sequentially obtained waveform width data. Reading means for sequentially reading data stored in the memory, storing means for storing waveform width data obtained by reading from the track when a reading error occurs during reading, and storing the stored waveform width data from the transport end side. Since it comprises re-reading means for reading data recorded on the magnetic information recording medium by analyzing it at the transport start end side, it is possible to prevent the occurrence of a reading error beforehand, and when the information recording medium is a ticket or the like. Can improve ticket processing efficiency. Further, even when the track is divided into two and the same data is recorded in each part, re-reading can be easily performed to prevent occurrence of a reading defect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a magnetic data reading device according to an embodiment of the present invention.

FIG. 2 is a front view of a magnetic information recording medium.

FIG. 3 is a flowchart illustrating a read control operation.

FIG. 4 is a front view of another magnetic information recording medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal generation circuit 2 Track CPU 2a Magnetic data width detection circuit 2b Data processing circuit H Readhead C, C 'Magnetic information recording medium

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/10 321 G11B 20/10 321Z

Claims (2)

[Claims] 1. A magnetic data reading device for reading data recorded on a track provided along a transport direction of a magnetic information recording medium, wherein the data is read from a transport start end to a transport end of the track. Reading means for sequentially reading data recorded on the magnetic information recording medium based on sequentially obtained waveform width data; and a waveform obtained by reading from the track when a reading error occurs during reading. Storage means for storing width data; and re-read means for reading the data recorded on the magnetic information recording medium by analyzing the stored waveform width data from the transport end side to the transport start side. Magnetic data reader. 2. The magnetic data reader according to claim 1, wherein the track is divided into two parts, and the same data is recorded in each part.