WO1992005551A1 - Magnetic recording card and data read system - Google Patents

Magnetic recording card and data read system Download PDF

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Publication number
WO1992005551A1
WO1992005551A1 PCT/JP1991/001257 JP9101257W WO9205551A1 WO 1992005551 A1 WO1992005551 A1 WO 1992005551A1 JP 9101257 W JP9101257 W JP 9101257W WO 9205551 A1 WO9205551 A1 WO 9205551A1
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WIPO (PCT)
Prior art keywords
data
magnetic recording
signal
card
recording card
Prior art date
Application number
PCT/JP1991/001257
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French (fr)
Japanese (ja)
Inventor
Shigeru Izawa
Original Assignee
Kabushiki Kaisha Csk
Nihon Card Center Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Kabushiki Kaisha Csk, Nihon Card Center Kabushiki Kaisha filed Critical Kabushiki Kaisha Csk
Publication of WO1992005551A1 publication Critical patent/WO1992005551A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00884—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/12—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being sensed by magnetic means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing

Definitions

  • the present invention relates to a magnetic recording card in which data is recorded in a magnetic recording area by a plurality of data signals, and a data recording system using the magnetic recording card.
  • a conventional magnetic recording card records data in a magnetic recording area by a data signal formed within a single frequency band. Also, only one type of data was written per track.
  • the above-described conventional magnetic recording card records data using a data signal in a single frequency band, and only one type of data is recorded per track. It was easy to get the night. For this reason, the magnetic recording card could be stolen or forged overnight, and there was a problem in terms of security.
  • a magnetic recording card is a magnetic recording card having a magnetic recording area for magnetically recording data, wherein the magnetic recording area is provided in a different frequency band from the magnetic recording area.
  • the plurality of data signals recorded in the magnetic recording area are not rewritten irrespective of the use of the specific data data signal and the magnetic recording force.
  • a data reading method is a data reading method comprising: a magnetic recording card having a magnetic recording area for magnetically recording data; and a reading device for reading data from the magnetic recording card.
  • the data is formed in the magnetic recording area of the magnetic recording card in a frequency band different from each other, and is not rewritten irrespective of the data signal of the specific data and the use of the magnetic recording card.
  • a bandpass filter consisting of A superimposed signal generated by superimposing a plurality of data signals including at least one set of data signals is recorded, and the reading device includes a band-pass filter that separates the read superimposed signal.
  • a memory for storing data that is not rewritten regardless of the use of the magnetic recording card and a memory for reading from the memory from a data signal that is not separated by the band filter.
  • FIG. 1 is a block diagram showing the configuration of a reading device used in the data reading method of the present invention.
  • FIG. 2 is a perspective view showing an embodiment of the magnetic recording card of the present invention
  • FIG. 3 is a chart showing a data signal of the data recorded on the magnetic recording card of FIG.
  • FIG. 2 is a perspective view showing an embodiment of the magnetic recording card of the present invention.
  • the magnetic recording card 1 of this embodiment has a band-shaped magnetic recording area 10.
  • the magnetic recording area 10 contains five types of data shown in FIG. Is recorded. Each data is formed in a different frequency band, and is written by a superimposed signal generated by superimposing them. Therefore, in the magnetic recording area 10, five types of data are simultaneously recorded in one track.
  • the above five types of data are black and white data, information data, and ID data I! It is composed of ⁇ .
  • the information data is various data according to the use purpose of the magnetic recording card 1, such as money data and frequency data, and is usually rewritten according to the use of the magnetic recording card 1.
  • the ID data ⁇ and the information data are recorded in the same or extremely close frequency band as a demodulated signal.
  • FIG. 1 shows a professional and a schematic diagram of a reading device for reading data recorded on the magnetic recording card 1.
  • the reading device 2 reads a composite signal recorded from the magnetic recording card 1 and separates the signal into data signals for each frequency band. It comprises a data decryption unit 40 for extracting information data.
  • the reading unit 30 scans the magnetic recording area 10 of the magnetic recording card 1 to a magnet for reading a superimposed signal, and amplifies the read signal read by the source 31 and the magnetic head 31.
  • Amplifier circuit 32 to be read and the read signal amplified by the amplifier circuit. It is provided with band filters 33 to 36 for extracting data signals forming the data of the lock data, the information data, and the ID data I to III for each frequency band.
  • the band filter 33 is a data signal of information data and ID data
  • the band filter 34 is a clock data data signal
  • the band filter is a band filter.
  • Reference numeral 35 denotes a data signal of the ID data I
  • a band filter 36 obtains a data signal of the ID data II.
  • the separated ID signals I and II are sent to a data processing unit (not shown) for processing.
  • a data processing unit not shown
  • the information data and the 1D data III are formed of data signals in the same or extremely close frequency band, they cannot be separated by the band filter 33, and the The data is sent to the data decoding unit 40 together with the block data.
  • the data decoding unit 40 includes a sampling unit 41 for sampling the transmitted data signal, a memory 42 for storing the ID data III in advance, and a sampling unit 41.
  • a subtraction unit 43 for subtracting the data signal of ID data ⁇ read from the memory 42 from the data signal sampled by the sampling unit 41 is provided.
  • the sampling of the data signal by the sampling section 41 and the reading of the ID data from the memory 42 are synchronized with the clock data. Done.
  • the ID data III is data that is not rewritten regardless of the use of the magnetic recording card 1, it is necessary to always obtain an accurate information data signal by the above processing. Can be. Taking The data signal of the output information data is sent to the data processing unit for processing.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

A system can protect data from being stolen or forged. A plurality of data signals not separated by a band-pass filter and including signals of the data within different frequency band and not rewritten even by use of a magnetic card are superimposed, and the resultant signal is recorded in the magnetic recording area of a magnetic card. The system has a reader comprising a band-pass filter, a memory for storing data not rewritten even by use of the above magnetic card, and a subtracting section for subtracting the signal of the data read out of the above memory from the data signal not separated by the above band-pass filter.

Description

明 細 書 磁気記録カー ド及びデータ読取 り方式 [技術分野〗  Description Magnetic recording card and data reading method [Technical field II]
本発明は、 磁気記録領域に複数のデー タ信号に よ り データ を記録した磁気記録カ ー ド及び該磁気記録カー ド を用いたデータ記録方式に関する。  The present invention relates to a magnetic recording card in which data is recorded in a magnetic recording area by a plurality of data signals, and a data recording system using the magnetic recording card.
[背景技術 ]  [Background Art]
従来の磁気記録カー ドは、 単一の周波数帯域内で形成 されたデータ信号によ り 、 磁気記録領域にデータを記録 していた。 また 1 ト ラ ッ ク には 1 種類のデータのみが書 込まれていた。  A conventional magnetic recording card records data in a magnetic recording area by a data signal formed within a single frequency band. Also, only one type of data was written per track.
これに応じて従来の磁気記録カー ドの読取り装置は、 磁気へ 、ソ ドで読取った読取 り信号をそのま ま Aノ D変換 してデータ処理を行っていた。  In response to this, conventional magnetic recording card readers have performed data processing by directly A / D converting the read signal read by a magnet to magnetism.
しかしながら、 上述した従来の磁気記録カー ドは単一 の周波数帯域のデータ信号でデ一 夕 を記録 してお り 、 1 ト ラ ッ ク に 1 種類のデー タ のみが記録されている た め、 デ一夕の取得も容易であった。 このため、 磁気記録 カ ー ドのデ一夕の盗難や偽造が行われるおそれがあ り 、 セキ ュ リ テ ィ の面で問題があった。  However, the above-described conventional magnetic recording card records data using a data signal in a single frequency band, and only one type of data is recorded per track. It was easy to get the night. For this reason, the magnetic recording card could be stolen or forged overnight, and there was a problem in terms of security.
本発明は上記従来の課題を解決し、 磁気記録カー ドの セキ ュ リ テ ィ の向上を図る こ と を目的 とする。 [発明の開示 ] It is an object of the present invention to solve the above-mentioned conventional problems and to improve the security of a magnetic recording card. [Disclosure of the Invention]
上記の 目 的を達成する ため本発明の磁気記録カ ー ド は、 磁気的にデータ を記録する磁気記録領域を有する磁 気記録カー ド において、 上記磁気記録領域に、 互いに異 なる周波数帯域内で形成される複数のデータ信号を重合 して生成した重合信号を記録したこ と によ り 、 1 ト ラ ヅ ク に複数のデータ を重畳して記録する こ とができ、 従来 の読取 り装置ではデータの読取りができず、 データの盗 難や偽造を防止する こ とができる。  In order to achieve the above-mentioned object, a magnetic recording card according to the present invention is a magnetic recording card having a magnetic recording area for magnetically recording data, wherein the magnetic recording area is provided in a different frequency band from the magnetic recording area. By recording a superimposed signal generated by superimposing a plurality of data signals to be formed, it is possible to superimpose and record a plurality of data on one track. Data cannot be read, preventing data theft or forgery.
また第 2項の発明は、 磁気記録領域に記録される複数 のデータ信号が、 特定のデータのデータ信号と磁気記録 力一 ドの使用に関らず書替えられる こ とのない他のデー 夕のデータ信号とからなる帯域フ ィ ル夕 によ って分離さ れない少な く と も 1 組のデ一夕信号を含むこ とによ り 、 帯域フ ィ ルタを用いても特定のデ一夕を分離して取出す こ とができず、 データの盗難や偽造防止に一層効果があ る。  In the invention of the second aspect, the plurality of data signals recorded in the magnetic recording area are not rewritten irrespective of the use of the specific data data signal and the magnetic recording force. By including at least one set of data signals that are not separated by a band filter composed of data signals, even if a band filter is used, a specific data Cannot be separated and taken out, which is even more effective in preventing data theft and forgery.
さ らに、 本発明のデータ読取り方式は、 磁気的にデ一 タを記録する磁気記録領域を有する磁気記録カー ド と、 該磁気記録カー ドのデータを読取る読取り装置とで構成 されるデータ読取 り方式において、 上記磁気記録カー ド の磁気記録領域に、 互いに異なる周波数の帯域内で形成 され、 かつ特定のデータのデータ信号と磁気記録カー ド の使用 に関 らず書替え られる こ と のない他のデータ の データ信号とからなる帯域フ ィ ルタ によって分離されな い少な く と も 1 組のデータ信号を含む複数のデータ信号 を重合して生成した重合信号を記録してな り 、 上記読取 り装置は、 読取った上記重合信号を分離する帯域フ ィ ル タ と 、 上記磁気記録カー ドの使用に関らず書替えられる こ とのないデータ を記憶するメ モ リ と 、 上記帯域フ ィ ル 夕 によ って分離されないデータ信号から上記メ モ リ よ り 読出 したデータのデータ信号を減算する減算部と を備え る こ と によ り 、 磁気記録カー ドの磁気記録領域に重畳し て書込まれた複数のデータ を分離して読取る こ とができ る。 . Further, a data reading method according to the present invention is a data reading method comprising: a magnetic recording card having a magnetic recording area for magnetically recording data; and a reading device for reading data from the magnetic recording card. In the recording method, the data is formed in the magnetic recording area of the magnetic recording card in a frequency band different from each other, and is not rewritten irrespective of the data signal of the specific data and the use of the magnetic recording card. Separated by a bandpass filter consisting of A superimposed signal generated by superimposing a plurality of data signals including at least one set of data signals is recorded, and the reading device includes a band-pass filter that separates the read superimposed signal. And a memory for storing data that is not rewritten regardless of the use of the magnetic recording card, and a memory for reading from the memory from a data signal that is not separated by the band filter. By providing a subtraction unit for subtracting the data signal of the obtained data, it is possible to separate and read a plurality of data written in a superimposed manner on the magnetic recording area of the magnetic recording card. .
[図面の簡単な説明 ]  [Brief description of drawings]
第 1 図は本発明のデータ読取 り方式に用いる読取 り装 置の構成を示すプロ ク図、  FIG. 1 is a block diagram showing the configuration of a reading device used in the data reading method of the present invention.
第 2 図は本発明の磁気記録カー ドのー実施例を示す斜 視図、  FIG. 2 is a perspective view showing an embodiment of the magnetic recording card of the present invention,
第 3 図は第 2 図の磁気記録カー ドに記録されたデ一夕 のデ一夕信号を示すチャー ト である。  FIG. 3 is a chart showing a data signal of the data recorded on the magnetic recording card of FIG.
[発明を実施する ための最良の形態 ]  [Best mode for carrying out the invention]
以下、 本発明の一実施例について図面を参照して説明 する。  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
第 2 図は本発明の磁気記録カー ドのー実施例を示す斜 視図である。  FIG. 2 is a perspective view showing an embodiment of the magnetic recording card of the present invention.
図示のよ う に本実施例の磁気記録カ ー ド 1 は帯状の磁 気記録領域 1 0 を有してなる。  As shown, the magnetic recording card 1 of this embodiment has a band-shaped magnetic recording area 10.
磁気記録領域 1 0 には、 第 3 図に示す 5種類のデ一夕 が記録してある。 各データは互いに異なる周波数帯域で 形成されてお り 、 これらを重合して生成した重合信号に よ って書込まれている。 従って、 磁気記録領域 1 0 は、 1 ト ラ ッ ク に 5種類のデ一夕を同時に記録するこ と と な る。 The magnetic recording area 10 contains five types of data shown in FIG. Is recorded. Each data is formed in a different frequency band, and is written by a superimposed signal generated by superimposing them. Therefore, in the magnetic recording area 10, five types of data are simultaneously recorded in one track.
上記 5種類のデータは、 ク ロ 、ソ クデータ と、 情報デ一 夕 と 、 I Dデ一夕 I 〜！ Πで構成される。 情報データは金 銭データや度数データ等磁気記録カー ド 1 の使用目的に 応じた種々 のデータであ り 、 通常、 磁気記録カー ド 1 の 使用に従って書替えられる。 また、 I Dデータ ΙΠ と情報 データ とは同一または極めて近接する周波数帯域のデ一 夕信号で記録されている。  The above five types of data are black and white data, information data, and ID data I! It is composed of Π. The information data is various data according to the use purpose of the magnetic recording card 1, such as money data and frequency data, and is usually rewritten according to the use of the magnetic recording card 1. In addition, the ID data ΙΠ and the information data are recorded in the same or extremely close frequency band as a demodulated signal.
こ こ で、 上記の磁気記録力一 ド 1 を用いたデ一夕記録 方式について説明する。  Here, a data recording method using the above magnetic recording force 1 will be described.
第 1 図に、 磁気記録カー ド 1 に記録されたデータを読 取る読取 り装置のプロ 、ソ ク図を示す。  FIG. 1 shows a professional and a schematic diagram of a reading device for reading data recorded on the magnetic recording card 1.
読取 り 装置 2 は、 磁気記録カー ド 1 よ り記録された重 合信号を読取って周波数帯域ごとのデータ信号に分離す る読取 り 部 3 0 と 、 読取 り部 3 0 で分離したデータ信号 から情報データ を取出すデータ解読部 4 0 とからなる。 読取 り 部 3 0 は、 磁気記録カ ー ド 1 の磁気記録領域 1 0 を走査して重合信号を読取る磁気へ、ソ ド 3 1 と、 磁 気へ ッ ド 3 1 で読取った読取り信号を増幅させるア ンプ 回路 3 2 と 、 ア ンプ回路で増幅 し た読取 り 信号よ り ク ロ ッ クデータ 、 情報データ 、 I Dデータ I 〜 IIIのデ一夕 を形成する デー タ信号を周波数帯域ご と に取出す帯域 フ ィ ルタ 3 3〜 3 6 と を備えてなる。 こ こで、 帯域フ ィ ル夕 3 3 は情報データ と I Dデ一夕 ΙΠのデ一夕信号を、 帯域フ ィ ル夕 3 4 はク ロ ッ クデータのデータ信号を、 帯 域フ ィ ル タ 3 5 は I D デー タ I のデー タ 信号を、 帯域 フ ィ ルタ 3 6 は I Dデータ II のデータ信号をそれぞれ取 出す。 The reading device 2 reads a composite signal recorded from the magnetic recording card 1 and separates the signal into data signals for each frequency band. It comprises a data decryption unit 40 for extracting information data. The reading unit 30 scans the magnetic recording area 10 of the magnetic recording card 1 to a magnet for reading a superimposed signal, and amplifies the read signal read by the source 31 and the magnetic head 31. Amplifier circuit 32 to be read and the read signal amplified by the amplifier circuit. It is provided with band filters 33 to 36 for extracting data signals forming the data of the lock data, the information data, and the ID data I to III for each frequency band. Here, the band filter 33 is a data signal of information data and ID data, the band filter 34 is a clock data data signal, and the band filter is a band filter. Reference numeral 35 denotes a data signal of the ID data I, and a band filter 36 obtains a data signal of the ID data II.
分離して取出 した I Dデ一夕 I , II のデ一夕信号はそ れぞれデー タ 処理部 （図示せず） に送られて処理され る。 一方、 情報デ一夕 と 1 Dデータ III とは同一または極 めて近接する周波数帯域のデータ信号で形成してあるた め、 帯域フ ィ ルタ 3 3 で分離する こ とができず、 ク ロ ッ ク データ と共にデータ解読部 4 0へ送られる。  The separated ID signals I and II are sent to a data processing unit (not shown) for processing. On the other hand, since the information data and the 1D data III are formed of data signals in the same or extremely close frequency band, they cannot be separated by the band filter 33, and the The data is sent to the data decoding unit 40 together with the block data.
デ一夕解読部 4 0 は、 送られたデータ信号をサ ンプ リ ングするサ ンプ リ ング部 4 1 と 、 予め I Dデ一夕 IIIを格 納 してお く メ モ リ 4 2 と、 サ ンプ リ ング部 4 1 でサ ンプ リ ン グしたデータ信号からメ モ リ 4 2 よ り読出 した I D データ ΙΠのデータ信号を減算する減算部 4 3 とを備えて なる。 サ ンプ リ ン グ部 4 1 によるデ一夕信号のサ ンプ リ ン グと メ モ リ 4 2 からの I Dデ一夕 Πίの読出 しはク ロ ヅ ク デ一 夕 に よ り 同期 を と つ て行われる 。 ま た 、 I D データ IIIは磁気記録カー ド 1 の使用に関らず書替えられ る こ とのないデータ なので、 上記の処理によ り 、 常に正 確な情報データのデ一夕信号を取出すこ とができる。 取 出 した情報データのデータ信号はデータ処理部に送られ て処理される。 The data decoding unit 40 includes a sampling unit 41 for sampling the transmitted data signal, a memory 42 for storing the ID data III in advance, and a sampling unit 41. A subtraction unit 43 for subtracting the data signal of ID data ΙΠ read from the memory 42 from the data signal sampled by the sampling unit 41 is provided. The sampling of the data signal by the sampling section 41 and the reading of the ID data from the memory 42 are synchronized with the clock data. Done. In addition, since the ID data III is data that is not rewritten regardless of the use of the magnetic recording card 1, it is necessary to always obtain an accurate information data signal by the above processing. Can be. Taking The data signal of the output information data is sent to the data processing unit for processing.

Claims

請 求 の 範 囲 The scope of the claims
( 1 ) 磁気的にデータを記録する磁気記録領域を有する磁 気記録カー ド において、 上記磁気記録領域に、 互いに異 なる周波数帯域内で形成される複数のデータ信号を重合 して生成した重合信号を記録したこ と を特徴とする磁気 記録力一 ド 。 (1) In a magnetic recording card having a magnetic recording area for magnetically recording data, a superimposed signal generated by superimposing a plurality of data signals formed in different frequency bands on the magnetic recording area. A magnetic recording head characterized in that a magnetic recording force is recorded.
( 2 ) 磁気記録領域に記録される複数のデータ信号が、 特 定のデ一夕のデータ信号と磁気記録力一 ドの使用に関ら ず書替えられる こ とのない他のデータのデータ信号とか ら なる帯域フ ィ ルタ に よ っ て分離されない少な く と も (2) A plurality of data signals recorded in the magnetic recording area include a specific data signal and a data signal of other data which is not rewritten regardless of use of the magnetic recording force. At least not separated by additional bandpass filters
1 組のデータ信号を含むこ とを特徴とする請求の範囲第Claims characterized by including a set of data signals.
1 項に記載の磁気記録カー ド。 The magnetic recording card according to item 1.
( 3 ) 磁気的にデータを記録する磁気記録領域を有する磁 気記録カー ド と 、 該磁気記録カー ドのデータ を読取る読 取 り 装置とで構成されるデータ読取 り方式において、 上 記磁気記録カ ー ドの磁気記録領域に、 互いに異なる周波 数の帯域内で形成され、 かつ特定のデータのデータ信号 と磁気記録力一 ドの使用に関らず書替えられる こ とのな い他のデー タ のデー タ信号 と か ら なる帯域フ ィ ルタ に よ って分離されない少な く と も 1 組のデ一夕信号を含む 複数のデータ信号を重合して生成した重合信号を記録し てな り 、 上記読取 り装置は、 読取った上記重合信号を分 離する帯域フ ィ ルタ と 、 上記磁気記録カー ドの使用に関 ら ず書替え られる こ と のないデ一夕 を記憶する メ モ リ と、 上記帯域フ ィ ルタ によ って分離されないデータ信号 から上記メ モ リ よ り読出したデータのデータ信号を減算 する減算部と を備えるこ とを特徴とするデータ読取り方 式。 (3) In a data reading method comprising a magnetic recording card having a magnetic recording area for magnetically recording data and a reading device for reading data from the magnetic recording card, Other data formed in the magnetic recording area of the card within a frequency band different from each other and which is not rewritten regardless of the data signal of the specific data and the use of the magnetic recording head. A superimposed signal generated by superimposing a plurality of data signals including at least one set of data signals which is not separated by the bandpass filter composed of the data signal of The reading device includes a band filter for separating the read overlapped signal and a use of the magnetic recording card. And a subtraction unit that subtracts a data signal of data read from the memory from a data signal that is not separated by the bandpass filter from a memory that stores data that is not rewritten. A data reading method characterized by having and.
PCT/JP1991/001257 1990-09-20 1991-09-20 Magnetic recording card and data read system WO1992005551A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP25117990A JPH04132046A (en) 1990-09-20 1990-09-20 Magnetic recording card and data reading system
JP2/251179 1990-09-20

Publications (1)

Publication Number Publication Date
WO1992005551A1 true WO1992005551A1 (en) 1992-04-02

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JP (1) JPH04132046A (en)
WO (1) WO1992005551A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901857A (en) * 1997-05-30 1999-05-11 Beloit Technologies, Inc. Bar screen bar mount

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5812103A (en) * 1981-07-16 1983-01-24 Foster Denki Kk Double magnetic recording system
JPS62212974A (en) * 1986-03-13 1987-09-18 Glory Ltd Certifying and identifying method for certifying and identifying media
JPS63263669A (en) * 1987-04-20 1988-10-31 Csk Corp Magnetic card recording system
JPH02105985A (en) * 1988-10-14 1990-04-18 Nippon Kaade Center Kk Data protection system for magnetic card

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5812103A (en) * 1981-07-16 1983-01-24 Foster Denki Kk Double magnetic recording system
JPS62212974A (en) * 1986-03-13 1987-09-18 Glory Ltd Certifying and identifying method for certifying and identifying media
JPS63263669A (en) * 1987-04-20 1988-10-31 Csk Corp Magnetic card recording system
JPH02105985A (en) * 1988-10-14 1990-04-18 Nippon Kaade Center Kk Data protection system for magnetic card

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5901857A (en) * 1997-05-30 1999-05-11 Beloit Technologies, Inc. Bar screen bar mount

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