JP3934756B2 - Information processing apparatus and information processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is, for example, a first magnetic body according to a high coercivity recording, used for processing information such as a magnetic card having a second magnetic material having a characteristic that once increased applying a magnetic field result coercive force The present invention relates to an information processing apparatus and an information processing method including a magnetic head.
[0002]
[Prior art]
Conventionally, contents recorded in the first magnetic body high coercivity recording, a second magnetic body initially has a significantly coercive force becomes higher characteristic when the coercive force is exposed once the magnetic field has been set lower Various techniques for recording different signals superimposed on the first and second magnetic bodies and separating the first information and the second information at the time of demodulation are proposed. Has been.
[0003]
For example, in the related art according to an example, a signal obtained from information recorded in the first magnetic body and a portion where the magnetic field of the first magnetic body and the second magnetic body is not applied are recorded. By performing the difference processing with the signal obtained from the information obtained, only the signal obtained from the information recorded in the portion where the magnetic field of the second magnetic body is not applied has been extracted. In such prior art, a DC erasing magnetic field is synchronized with 1 and 0 of the first signal and divided into a magnetized portion and a non-magnetized portion, and then the second recording is performed, and a security signal is incorporated by the combination thereof. It was.
[0004]
[Problems to be solved by the invention]
However, the conventional technique has a problem in that the change point of the recording of the first signal related to the application timing of the DC erasing magnetic field affects the next second recording. In other words, after applying a DC erasing magnetic field in synchronization with 1 and 0 of the first signal as shown in the upper part of FIG. 7, the second recording as shown in the middle part of FIG. At the change point of signal 1, the second recording is performed in an area where the second recording should not be originally performed. As a result, as shown in the lower part of FIG. There was a problem that it would occur.
[0005]
The present invention has been made in view of the above problems, and the object of the present invention is to reduce the occurrence of noise at the change point of the application timing of the DC erasing magnetic field, and to relate to the conveyance speed and input direction of the information recording medium. It is another object of the present invention to provide an information processing apparatus and an information processing method that can detect peaks related to two overlapping recording signals with high accuracy and independently extract the two recording signals by simple processing. .
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in the first aspect of the present invention, the first magnetic material for recording the recorded content with high coercivity and the coercive force are set once the coercive force is set low and the magnetic field is applied once. In an information processing apparatus for processing information recorded on a magnetic recording medium having a magnetic layer formed by mixing a second magnetic material having high characteristics, an area to which a magnetic field should be applied and not to be applied A magnetic field is applied to a predetermined region of the first and second magnetic bodies based on a synchronization signal obtained by changing a change point with the region in a slope shape, thereby forming a region in which the magnetic rewriting cannot be performed on the second magnetic body. And recording means for recording predetermined information in the entire area of the first magnetic body and the area of the second magnetic body to which no magnetic field is applied, and recorded on the first magnetic body. First reproducing means for reproducing a signal from the received information; Second reproducing means for reproducing a signal from information recorded on the first magnetic body and information recorded on a portion of the second magnetic body to which the magnetic field is not applied, and the first reproducing means Is obtained from information recorded in a portion of the second magnetic body where the magnetic field is not applied, by performing a difference process between the signal obtained by the above and the signal obtained by the second reproducing means. Control means for extracting only the signal.
[0007]
In the second aspect of the present invention, the first magnetic material for recording the recorded content with high coercivity and the second magnetic material having a characteristic that the coercive force is increased when the magnetic field is first applied after the coercive force is set low. In an information processing method for processing information recorded on a magnetic recording medium having a magnetic layer formed by mixing with a magnetic material, a change point between a region to which a magnetic field should be applied and a region to which a magnetic field should not be applied is sloped On the basis of the synchronization signal changed to, a magnetic field is applied to a predetermined region of the first and second magnetic bodies to form a region in which the magnetic rewrite cannot be performed on the second magnetic body, and the first magnetic body A first step for recording predetermined information in an entire area of the body and an area where the magnetic field of the second magnetic body is not applied, and a signal is reproduced from the information recorded in the first magnetic body. The second step and the first magnetic body. A third step of reproducing a signal from the recorded information and information recorded in a portion of the second magnetic body to which the magnetic field is not applied, the signal obtained in the second step, and the third A fourth step of extracting only a signal obtained from information recorded in a portion of the second magnetic body to which the magnetic field is not applied by performing a difference process with the signal obtained in the step Have.
[0008]
According to the first to tenth aspects, the changing point of the region not to be applied and the application should do region the magnetic field on the basis of the sync signal is changed in a slope shape, the first and second Since a magnetic field is applied to a predetermined area of the magnetic material, there is an effect that no noise occurs in the recorded information at the change point.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a configuration of an information processing apparatus according to an embodiment. In the present embodiment, when a DC erasing magnetic field is applied to a one-time recording track of a magnetic card, a change in timing between a region to which a magnetic field is to be applied and a region to which a magnetic field is not to be applied is a reference signal for applying a DC erasing magnetic field. It is characterized by adopting so-called “slope control” that changes the point into a slope shape. Such slope control will be described in detail in the description of FIG.
[0010]
As shown in FIG. 1, a control unit 1 that controls the entire system includes a transport mechanism 4 for transporting a card and a magnetic head for writing for writing magnetic information on the card via drivers 3a, 3b, and 3c. 5a and the magnetic head 5b for writing are electrically connected to each other. On the other hand, the output of the first core 8 a of the read magnetic head 8 is electrically connected to the S + N signal demodulator 6, and the output of the second core 8 b is electrically connected to the N signal demodulator 7. The outputs of the S + N signal demodulator 6 and the N signal demodulator 7 are further connected to a differentiator 9 in the subsequent stage. The output of the N signal demodulator 7 and the output of the differencer 9 are each electrically connected to the controller 1.
[0011]
In addition, an operation panel 2 for an operator to instruct various operations is connected to the control unit 1. In such a configuration, under the control of the control unit 1, the magnetic card is conveyed by the conveyance mechanism 4 via the driver 3a, and the magnetic card is written to the magnetic card by the drivers 3b and 3c via the write magnetic heads 5a and 5b. Initial information is written. Details of the initial information to be written will be described later. Further, details of the slope control which is a feature of the present invention will be described later.
[0012]
On the other hand, at the time of reading, under the control of the control unit 1, a signal in which the S signal and the N signal are superimposed is reproduced via the first core 8 a of the reading magnetic head 8, and the S + N signal demodulating unit 6 in the subsequent stage is reproduced. Is input. At the same time, the N signal is reproduced via the second core 8 b of the read magnetic head 8 and input to the N signal demodulator 7 at the subsequent stage. Then, the difference between the signal demodulated by the S + N signal demodulator 6 and the signal demodulated by the N signal demodulator 7 is taken by the differentiator 9 so that only the S signal is extracted and input to the controller 1. It will be. At the same time, the N signal demodulated by the N signal demodulator 7 is input to the controller 1. In this way, an S signal and an N signal can be obtained. The operation panel 2 is used by an operator to input various instructions to the control unit 1 when performing the above processing.
[0013]
Here, the detailed configuration of the write magnetic head 5 is as shown in FIG. As shown in the figure, the outputs of the write data control units 11a and 11b to which recording data is input are connected to the write magnetic head 13 via amplifiers 12a and 12b. The write data control units 11a and 11b and the amplifiers 12a and 12b correspond to the drivers 3b and 3c in FIG. 1, and the write magnetic head 13 corresponds to the write magnetic heads 5a and 5b in FIG.
[0014]
Further, the detailed configuration of the read magnetic head 8 is as shown in FIG. As shown in the figure, the output of the read magnetic head 15 is input to an S + N signal demodulator 17 and an N signal demodulator 18 via amplifiers 16a and 16b, respectively. An N signal is obtained as a signal demodulated by the N signal demodulator 18, and an S signal is obtained by the difference between the S + N signal demodulator 17 and the N signal demodulator 18. The read magnetic head 15 corresponds to the read magnetic head 8 in FIG. 1, the S + N signal demodulator 17 corresponds to the S + N signal demodulator 6 in FIG. 1, and the N signal demodulator 18 in FIG. Corresponds to the N signal demodulator 7.
[0015]
Next, FIG. 3 shows a configuration example of a magnetic card used in the information processing apparatus according to the embodiment of the present invention. As shown in the figure, this magnetic card has a configuration in which a magnetic layer 21 is disposed on a PET 22 serving as a base layer.
[0016]
In more detail, as the magnetic layer 21, for example a constructed high coercive recording magnetic barium ferrite, the first but is set coercive force is low at special processing is subjected to a time field a mixture of a S magnetic material having properties markedly coercive force increases, is obtained by applying a predetermined area on pET22.
[0017]
FIG. 4 is a plan view showing the configuration of the magnetic card of FIG. As shown in the figure, the predetermined region on the PET23 as a substrate, and the S magnetic body and high coercive recording magnetic are mixed respectively, and a read / write track 24a and the one-time recording track 24b Is provided. Further, general issue information and the like are recorded on the one-time recording track 24b, and a magnetic field is applied only to a predetermined area of the S magnetic material of the one-time recording track 24b, as will be described in detail later. to differentiate areas of high and low coercive force by "encryption key" and the like as a hiding information related to the output pulse width or the like is to be recorded.
[0018]
Hereinafter, with reference to the timing chart of FIG. 5, an information writing operation to the magnetic card by the information processing apparatus according to the present embodiment will be described.
5A shows the timing of applying the DC erasing magnetic field under slope control, FIG. 5B shows the erasing state of the one-time recording track, FIG. 5C shows the encoding information, Figure 5 (d) recording the state of the one-time recording track, FIG. 5 (e) shows the S magnetic and high coercive recording magnetic both of the reproduced waveform, FIG. 5 (f) is S magnetic body and high coercive shows both signals read from the take part of the recording magnetic, FIG 5 (g) shows a reproduction waveform of the high-coercivity recording magnetic material.
[0019]
In the one-time recording track 24b, when a card is issued, that is, in an initial state, as shown in FIG. 5A, a synchronizing signal for applying an erasing magnetic field at the time of rising is changed from 0 (low level) to 1 ( The slope is changed to a slope shape from 1 (high level) to 0 (low level) to change the sync signal for applying the erasing magnetic field to the slope shape. Under control, a DC erasing magnetic field is partially applied only to a predetermined region. In the prior art, in synchronization with the signal 1, 0, the magnetized portion and the non-magnetized portion are separated, and the DC erasing magnetic field is applied only to the magnetized portion. Although this has had an adverse effect on the recording of the encoded information, the present invention avoids this problem by adopting so-called slope control in which the change point is changed into a slope shape.
[0020]
The DC magnetic field erased, as shown in FIG. 5 (b), in the one-time recording tracks 24b, coercive force of the S magnetic material improves, a state can not be rewritten in the magnetic, whereas, the high coercive recording high coercive recording information in the magnetic material is erased. The encode information corresponding to the erased state of the one-time recording track 24b shown in FIG. 5B is as shown in FIG.
[0021]
At this time, in the above-described S magnetic body, a heightened portion coercive force by applying a magnetic field, but the portion where the magnetic field is not increased applied Sarezu coercive force will be mixed, interval of two parts ( The encryption key as the concealment information as described above is recorded depending on the (region width) or the number of output pulses. In this embodiment, information relating to the encryption key can be obtained from the length of the recordable area where no magnetic field is applied or the number of output pulses.
[0022]
In decrypting the encryption key, a predetermined threshold value is set in advance, and the information processing apparatus compares the length of the recordable area with the threshold value. It is also possible to adopt a method of determining “1” and “0” if it is shorter. However, it is needless to say that the present invention is not limited to this.
[0023]
Here, in this one embodiment, the S the magnetic field is applied portion of the magnetic material, because it can not rewrite the magnetic there is an increasing coercive force, can not be recorded again information, the S the parts and high coercive recording magnetic material above the magnetic field of the magnetic material is not applied, it is possible to record the encoded information such as the same way at the same time issuing information or the like and conventional (see FIG. 5 (d)).
[0024]
Next, FIG. 5E shows a reproduction waveform obtained by reading the one-time recording track 24b with the reading magnetic head 8 of the information processing apparatus according to the present embodiment. As described above, in the present invention, the “slope control” that controls the change point of the timing of the portion to which the DC erasing magnetic field is applied and the portion to which the DC erasing magnetic field is not applied is adopted in FIG. It can be seen that recording noise as shown in FIG. 7 does not occur in the change in the reproduction waveform shown.
[0025]
Here, in FIG. 5 (e), the pre-portion DC erasing magnetic field is changed to a high coercive force S magnetic is applied is a reproducible only data of high coercivity recording magnetic, DC erasing portion magnetic field is not applied is recorded information of both the S magnetic body and high coercive recording magnetic is reproducible. Therefore, in this portion, the peak of the reproduction waveform is broken into two and output.
[0026]
That is, as shown in FIG. 5 (f), the region where the peak shape broken into two above has appeared (in the figure, reference numeral x, y, a region indicated by z), i.e. S magnetic body and high coercive recording This corresponds to a portion where a signal can be read from both of the magnetic bodies and a portion having information relating to the encryption key. Incidentally, like the high-coercive record issuance information recorded in the magnetic material, it will be reproduced by the conventional manner of the magnetic head (see FIG. 5 (g)).
[0027]
In this one embodiment, the details will be described later, shown a reproduction waveform of the both recording information S magnetic body and high coercive recording magnetic body shown in FIG 5 (e), in FIG. 5 (f) by performing the differential processing between the reproduction waveform of the recording information of the high coercivity recording magnetic material, by extracting only the portion in which information in the S magnetic material is recorded, the "encryption key" from the number of pulses, etc. It has gained.
[0028]
Hereinafter, the difference processing by the information processing apparatus according to the present embodiment will be described in more detail with reference to the timing chart of FIG. The following actions also correspond to the information processing method of the present invention.
[0029]
When the DC erasing magnetic field under the slope control in a predetermined region of the S magnetic and high coercive recording magnetic body is applied at the timing shown in FIG. 6 (a), as described above, S to which the magnetic field is applied increased information coercivity regions of magnetic material, is differentiated from the other portions. The encoded information after this application is as shown in FIG.
[0030]
As described above, by adopting slope control in the signal related to the DC erasing magnetic field, there is a problem that noise occurs in the second recording at the change point of the signal related to the DC erasing magnetic field, which has been a problem in the prior art. Has been resolved.
[0031]
The reproduction waveform of the information read through the first core 8a of the read magnetic head 8 is as shown in FIG. 6C, and the reproduction related to the information read through the second core 8b. The waveform is as shown in FIG. Thus, since the high coercivity recording magnetic both information is read and S magnetic via the second cores 8b, the peak of the duplicate read portion of the waveform is cracked into two. In the waveform, it can be seen that there is no influence such as noise shown in the lower characteristic of FIG.
[0032]
The signals obtained by demodulating the reproduced waveforms of FIGS. 6C and 6D by the N signal demodulator 7 and the S + N signal demodulator 6 are shown in FIGS. 6E and 6F, respectively. As shown in Thus, by taking the difference between these output signals by the differentiator 9, a signal as shown in FIG. 6G, that is, the S signal recorded in the portion of the S magnetic material where the magnetic field is not applied. Is extracted.
[0033]
According to the method according to the present embodiment, the S signal can be extracted without providing a window as in the conventional technique. Also, the S signal and the N signal can be recognized without providing a bit in a special direction as in the prior art. In particular, in the conventional technique, the magnetized portion and the non-magnetized portion are divided in synchronization with the signals 1 and 0, and the DC erasing magnetic field is applied only to the magnetized portion. However, the present invention avoids this problem by adopting so-called slope control in which the change point is changed into a slope shape.
[0034]
Although the embodiment of the present invention has been described above, the information processing apparatus and the information processing method of the present invention are not limited to this, and various improvements and modifications can be made without departing from the spirit of the present invention. Of course. For example, in the above-described embodiment, a magnetic card has been described as an example of the magnetic recording medium. However, the present invention is not limited to this.
[0035]
【The invention's effect】
As described above in detail, according to the present invention, the occurrence of noise at the change point of the application timing of the DC erasing magnetic field is reduced, and two duplicated recording signals are used regardless of the conveyance speed and input direction of the information recording medium. It is possible to provide an information processing apparatus and an information processing method capable of detecting a peak related to the above with high accuracy and independently extracting the two recording signals by simple processing.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of an information processing apparatus according to an embodiment.
2A is a diagram showing a detailed configuration of a magnetic head for writing 5, and FIG. 2B is a diagram showing a detailed configuration of a magnetic head for reading 8. FIG.
FIG. 3 is a diagram illustrating a configuration example of a magnetic card used in the information processing apparatus according to the embodiment.
4 is a plan view of the magnetic card shown in FIG. 3. FIG.
FIG. 5 is a timing chart showing an information writing operation to the magnetic card by the information processing apparatus according to the embodiment.
FIG. 6 is a timing chart for explaining difference processing by the information processing apparatus according to the embodiment;
FIG. 7 is a diagram for explaining problems of the information processing apparatus according to the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Control part, 2 ... Operation panel, 3 ... Driver, 4 ... Conveyance mechanism, 5 ... Write magnetic head, 6 ... S + N signal demodulation part, 7 ... N signal demodulation part, 8 ... Read magnetic head, 9 ... Difference 10 and reading circuit.

Claims (4)

It is formed by mixing a first magnetic body that records the recorded content with high coercivity and a second magnetic body that has a characteristic that the coercive force is initially set low and the coercive force is increased once a magnetic field is applied. In an information processing apparatus for processing information recorded on a magnetic recording medium having a magnetic layer ,
A magnetic field is applied to a predetermined region of the first and second magnetic bodies based on a synchronization signal obtained by changing a change point between a region where a magnetic field should be applied and a region where a magnetic field should not be applied in a slope shape . Recording means for forming a non-magnetic rewritable area in the magnetic body and recording predetermined information in the entire area of the first magnetic body and the area where the magnetic field of the second magnetic body is not applied When,
First reproducing means for reproducing a signal from information recorded on the first magnetic body;
Second reproducing means for reproducing a signal from information recorded on the first magnetic body and information recorded on a portion of the second magnetic body to which the magnetic field is not applied;
By performing a difference process between the signal obtained by the first reproducing means and the signal obtained by the second reproducing means, it is recorded in a portion of the second magnetic body where the magnetic field is not applied. Control means for extracting only the signal obtained from the information being stored;
An information processing apparatus comprising: 2. The information according to claim 1 , wherein predetermined encryption information is obtained based on at least one of a pulse number and a region width of a signal related to a portion of the second magnetic body to which the magnetic field is not applied. Processing equipment. It is formed by mixing a first magnetic body that records the recorded content with high coercivity and a second magnetic body that has a characteristic that the coercive force is initially set low and the coercive force is increased once a magnetic field is applied. In an information processing method for processing information recorded on a magnetic recording medium having a magnetic layer ,
A magnetic field is applied to a predetermined region of the first and second magnetic bodies based on a synchronization signal obtained by changing a change point between a region where a magnetic field should be applied and a region where a magnetic field should not be applied in a slope shape . A first area for recording predetermined information in the entire area of the first magnetic body and the area to which the magnetic field of the second magnetic body is not applied is formed in the magnetic body in a region where magnetic rewriting cannot be performed . And the steps
A second step of reproducing a signal from information recorded on the first magnetic body;
A third step of reproducing a signal from information recorded on the first magnetic body and information recorded on a portion of the second magnetic body to which the magnetic field is not applied;
By recording the difference between the signal obtained in the second step and the signal obtained in the third step, the signal is recorded in the portion of the second magnetic body where the magnetic field is not applied. A fourth step of extracting only the signal obtained from the information;
An information processing method characterized by comprising: 4. The information according to claim 3 , wherein predetermined encryption information is obtained based on at least one of a pulse number and a region width of a signal relating to a portion of the second magnetic body to which the magnetic field is not applied. Processing method.

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