ES2173261T3 - Sistema que permite una descodificacion correcta, en forma de un mensaje binario, de un codigo magnetico registrado en una pista magnetica. - Google Patents

Sistema que permite una descodificacion correcta, en forma de un mensaje binario, de un codigo magnetico registrado en una pista magnetica.

Info

Publication number
ES2173261T3
ES2173261T3 ES96402208T ES96402208T ES2173261T3 ES 2173261 T3 ES2173261 T3 ES 2173261T3 ES 96402208 T ES96402208 T ES 96402208T ES 96402208 T ES96402208 T ES 96402208T ES 2173261 T3 ES2173261 T3 ES 2173261T3
Authority
ES
Spain
Prior art keywords
bits
magnetic
message
sub
length
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
ES96402208T
Other languages
English (en)
Inventor
Jacques Michel
Dominique Trouche
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales eTransactions CGA SA
Original Assignee
Thales eTransactions CGA SA
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.)
Filing date
Publication date
Application filed by Thales eTransactions CGA SA filed Critical Thales eTransactions CGA SA
Application granted granted Critical
Publication of ES2173261T3 publication Critical patent/ES2173261T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
    • G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
    • G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
    • G06K7/084—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
    • 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
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Probability & Statistics with Applications (AREA)
  • Error Detection And Correction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

EL CODIGO MAGNETICO PUEDE LLEVAR, SOBRE UNA LONGITUD QUE CORRESPONDE A UN NUMERO DE 10 BITS UNA ALTERACION LOCALIZABLE. EL SISTEMA CONSISTE EN AÑADIR AL MENSAJE DE M BITS (M = M1 + M2 + M3) UNA ESTRUCTURA DE CONTROL DE K BITS DE MANERA QUE LA PALABRA FORMADA DE N = M + K BITS SEA UNA PALABRA DE CODIGO DE REDUNDANCIA CICLICA GENERADA POR UN POLINOMIO GENERADOR G(X) DE GRADO K Y DIVISOR DE X{SUP,N}-1 EN EL ALGEBRA MODULO 2 SIN RETENCION. EN LA LECTURA, EL SISTEMA PERMITE LOCALIZAR UN PAQUETE DE BITS ALTERADO DETECTANDO UNA ALTERACION MAGNETICA DE LA PISTA QUE NORMALMENTE NO HACE APARECER MAS QUE IMANES DE LONGITUD L{SUB,1} = L +/- L/2 Y L{SUB,2}= 2L +/-L/2 POR UNA PARTE, Y POR OTRA PARTE IMANES SUCESIVOS DE LONGITUD L{SUB,1} EN NUMERO PAR TENIENDO EN CUENTA EL CODIFICADO DE BI-FRECUENCIA UTILIZADO. EL ERROR DETECTADO SE CORRIGE APLICANDO LA LEY G(X) AL MENSAJE LEIDO EN EL QUE, POR PERMUTACION CIRCULAR SE HACEN PASAR LOS BITS QUE FALTAN EN FIN DE MENSAJE.
ES96402208T 1995-10-20 1996-10-16 Sistema que permite una descodificacion correcta, en forma de un mensaje binario, de un codigo magnetico registrado en una pista magnetica. Expired - Lifetime ES2173261T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9512368A FR2740280B1 (fr) 1995-10-20 1995-10-20 Systeme permettant un decodage correct, sous forme d'un message binaire, d'un code magnetique enregistre sur une piste magnetique

Publications (1)

Publication Number Publication Date
ES2173261T3 true ES2173261T3 (es) 2002-10-16

Family

ID=9483752

Family Applications (1)

Application Number Title Priority Date Filing Date
ES96402208T Expired - Lifetime ES2173261T3 (es) 1995-10-20 1996-10-16 Sistema que permite una descodificacion correcta, en forma de un mensaje binario, de un codigo magnetico registrado en una pista magnetica.

Country Status (5)

Country Link
US (1) US5748649A (es)
EP (1) EP0769854B1 (es)
DE (1) DE69619329T2 (es)
ES (1) ES2173261T3 (es)
FR (1) FR2740280B1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6128528A (en) * 1999-03-18 2000-10-03 Medtronics, Inc. Error code calculations for data stored in an implantable medical device
US6526530B1 (en) * 1999-12-22 2003-02-25 Marvell International, Ltd. Method and apparatus for encoding data incorporating check bits and maximum transition run constraint
JP2009094605A (ja) * 2007-10-04 2009-04-30 Oki Semiconductor Co Ltd 符号誤り検出装置および誤り検出符号生成装置
GB2482735A (en) * 2010-08-13 2012-02-15 Alexandru Ion Sovu Data recovery for a magnetic stripe reader
JP7135657B2 (ja) * 2018-09-25 2022-09-13 株式会社デンソー 車両制御装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62271261A (ja) * 1986-05-20 1987-11-25 Sanyo Electric Co Ltd Ｐｃｍオ−デイオのマルチトラツク記録再生方法
JPS63126080A (ja) * 1986-11-14 1988-05-30 Fujitsu Ltd 記録媒体読取装置
JP2551017B2 (ja) * 1987-08-12 1996-11-06 富士通株式会社 デ−タ修正方式
US5136592A (en) * 1989-06-28 1992-08-04 Digital Equipment Corporation Error detection and correction system for long burst errors
JPH0447568A (ja) * 1990-06-15 1992-02-17 Teac Corp 磁気テープ装置におけるデータ読み取り方法
US5390195A (en) * 1992-04-03 1995-02-14 Ampex Corporation Miller-squared decoder with erasure flag output

Also Published As

Publication number Publication date
US5748649A (en) 1998-05-05
FR2740280A1 (fr) 1997-04-25
EP0769854B1 (fr) 2002-02-20
FR2740280B1 (fr) 1997-11-21
DE69619329T2 (de) 2002-10-24
EP0769854A1 (fr) 1997-04-23
DE69619329D1 (de) 2002-03-28

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