CA2407877A1 - Methods and apparatus for increased magnetic coding density by precise placement of magnetic transitions - Google Patents

Methods and apparatus for increased magnetic coding density by precise placement of magnetic transitions Download PDF

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Publication number
CA2407877A1
CA2407877A1 CA002407877A CA2407877A CA2407877A1 CA 2407877 A1 CA2407877 A1 CA 2407877A1 CA 002407877 A CA002407877 A CA 002407877A CA 2407877 A CA2407877 A CA 2407877A CA 2407877 A1 CA2407877 A1 CA 2407877A1
Authority
CA
Canada
Prior art keywords
bits
magnetic
transitions
encoded
methods
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.)
Granted
Application number
CA002407877A
Other languages
French (fr)
Other versions
CA2407877C (en
Inventor
Alberto J. Fernandez
Carlos D. Bormey
Ismael E. Negrin
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.)
XTec Inc
Original Assignee
Xtec, Incorporated
Alberto J. Fernandez
Carlos D. Bormey
Ismael E. Negrin
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 Xtec, Incorporated, Alberto J. Fernandez, Carlos D. Bormey, Ismael E. Negrin filed Critical Xtec, Incorporated
Publication of CA2407877A1 publication Critical patent/CA2407877A1/en
Application granted granted Critical
Publication of CA2407877C publication Critical patent/CA2407877C/en
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
    • 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
    • G06K19/06187—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 with magnetically detectable marking
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/125—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by magnetic means
    • 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
    • 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

Abstract

Methods and apparatus for increasing the density of data storage on a magnetic medium by using variations in positioning of magnetic transitions to encode bits. Conventionally encoded bits are written to the medium as sequences of magnetic transitions according to an encoding standard. Additional bits are encoded on the medium as deviations from a nominal position of magnetic transitions separating conventionally encoded bits. The deviation from the nominal position is within an allowable range of tolerance for the standard followed in encoding the conventionally encoded bits. In order to prevent accumulation of error, additional bits are only encoded in transitions separating a pair of conventionally encoded bits. The first and last transitions of the pair do not have additional bits encoded as deviations of transition locations. This technique allows the encoding of one additional bit for every two conventionally encoded bits.
CA002407877A 2000-05-01 2001-04-26 Methods and apparatus for increased magnetic coding density by precise placement of magnetic transitions Expired - Lifetime CA2407877C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/562,989 2000-05-01
US09/562,989 US6476991B1 (en) 2000-05-01 2000-05-01 Methods and apparatus for increased magnetic coding density by precise placement of magnetic transitions
PCT/US2001/013531 WO2001084543A2 (en) 2000-05-01 2001-04-26 Methods and apparatus for increased magnetic coding density by precise placement of magnetic transitions

Publications (2)

Publication Number Publication Date
CA2407877A1 true CA2407877A1 (en) 2001-11-08
CA2407877C CA2407877C (en) 2009-03-24

Family

ID=24248621

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002407877A Expired - Lifetime CA2407877C (en) 2000-05-01 2001-04-26 Methods and apparatus for increased magnetic coding density by precise placement of magnetic transitions

Country Status (9)

Country Link
US (2) US6476991B1 (en)
EP (1) EP1305794B1 (en)
JP (1) JP4933015B2 (en)
KR (1) KR100815410B1 (en)
AU (2) AU5918101A (en)
CA (1) CA2407877C (en)
DE (1) DE60131854T2 (en)
ES (1) ES2298235T3 (en)
WO (1) WO2001084543A2 (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7171560B2 (en) 1998-06-22 2007-01-30 Semtek Solutions, Inc. Method and apparatus for securing and authenticating encoded data and documents containing such data
US7543151B2 (en) * 1996-02-15 2009-06-02 Semtek Innovative Solutions Corporation Method and apparatus for securing and authenticating encoded data and documents containing such data
US7988553B2 (en) * 2002-07-17 2011-08-02 Igt Method and apparatus for enrolling gaming device players into a player-tracking system
US7309012B2 (en) * 2004-09-07 2007-12-18 Semtek Innovative Solutions, Inc. Secure magnetic stripe reader for handheld computing and method of using same
US7506812B2 (en) * 2004-09-07 2009-03-24 Semtek Innovative Solutions Corporation Transparently securing data for transmission on financial networks
US9123042B2 (en) 2006-10-17 2015-09-01 Verifone, Inc. Pin block replacement
US9361617B2 (en) 2008-06-17 2016-06-07 Verifone, Inc. Variable-length cipher system and method
US8769275B2 (en) 2006-10-17 2014-07-01 Verifone, Inc. Batch settlement transactions system and method
US20080288403A1 (en) * 2007-05-18 2008-11-20 Clay Von Mueller Pin encryption device security
US8355982B2 (en) 2007-08-16 2013-01-15 Verifone, Inc. Metrics systems and methods for token transactions
US20090159704A1 (en) * 2007-12-24 2009-06-25 Dynamics Inc. Cards and devices with magnetic emulators and magnetic read-head detectors
US20090218402A1 (en) * 2008-02-29 2009-09-03 Andrew Graham Hodges Apparatus and method for encrypting data in a magnetic stripe reader
US8144940B2 (en) 2008-08-07 2012-03-27 Clay Von Mueller System and method for authentication of data
US8104677B2 (en) * 2008-11-21 2012-01-31 Visa International Service Association Authentication of documents having magnetic stripe
US9027831B2 (en) * 2008-11-21 2015-05-12 Visa International Service Association Updating of reference magnetic signature for authenticating a document with a magnetic stripe
US7967203B2 (en) * 2008-11-21 2011-06-28 Visa International Service Association Authenticating a document with a magnetic stripe
US8118220B2 (en) * 2008-11-21 2012-02-21 Visa International Service Association Verifying cardholder identity using signature of the card
US8251283B1 (en) 2009-05-08 2012-08-28 Oberon Labs, LLC Token authentication using spatial characteristics
DE102009021011A1 (en) * 2009-05-13 2010-11-18 Siemens Aktiengesellschaft Electronic key for authentication

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4114029A (en) * 1974-10-16 1978-09-12 E M I Limited Magnetic recording
US5235166A (en) * 1991-02-14 1993-08-10 Xtec Incorporated Data verification method and magnetic media therefor
US5254843A (en) * 1991-08-07 1993-10-19 Hynes John E Securing magnetically encoded data using timing variations in encoded data
US5625689A (en) * 1993-04-09 1997-04-29 Washington University Method and apparatus for secure data storage and manipulation using magnetic media
US5546462A (en) * 1993-04-09 1996-08-13 Washington University Method and apparatus for fingerprinting and authenticating various magnetic media
WO1997027589A1 (en) * 1996-01-26 1997-07-31 Exabyte Corporation Handling defective frames on hard sectored magnetic tape
US5770846A (en) * 1996-02-15 1998-06-23 Mos; Robert Method and apparatus for securing and authenticating encoded data and documents containing such data
JPH11306675A (en) * 1998-04-22 1999-11-05 Toshiba Corp Data recording medium, master disk manufacturing device for the same, data recording medium producing device, data reproducing device and data transmitting method
JP4354614B2 (en) * 1999-07-07 2009-10-28 パナソニック株式会社 Optical disc recording apparatus and optical disc recording method

Also Published As

Publication number Publication date
EP1305794A2 (en) 2003-05-02
US20030043488A1 (en) 2003-03-06
US6678103B2 (en) 2004-01-13
AU5918101A (en) 2001-11-12
JP4933015B2 (en) 2012-05-16
DE60131854D1 (en) 2008-01-24
EP1305794B1 (en) 2007-12-12
JP2004507012A (en) 2004-03-04
US6476991B1 (en) 2002-11-05
DE60131854T2 (en) 2008-06-19
CA2407877C (en) 2009-03-24
KR20030003270A (en) 2003-01-09
WO2001084543A3 (en) 2002-04-04
KR100815410B1 (en) 2008-03-20
WO2001084543A2 (en) 2001-11-08
EP1305794A4 (en) 2005-09-07
ES2298235T3 (en) 2008-05-16
AU2001259181B2 (en) 2004-08-26

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Effective date: 20210426