EP1353301A2 - Lecteur de fil de sécurité magnétique - Google Patents

Lecteur de fil de sécurité magnétique Download PDF

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Publication number
EP1353301A2
EP1353301A2 EP03015595A EP03015595A EP1353301A2 EP 1353301 A2 EP1353301 A2 EP 1353301A2 EP 03015595 A EP03015595 A EP 03015595A EP 03015595 A EP03015595 A EP 03015595A EP 1353301 A2 EP1353301 A2 EP 1353301A2
Authority
EP
European Patent Office
Prior art keywords
thread
digital representation
magnetic
peak
heads
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
EP03015595A
Other languages
German (de)
English (en)
Other versions
EP1353301B1 (fr
EP1353301A3 (fr
Inventor
John Buttiant
Peter Dilwyn Evans
John Alan Skinner
Michael Potter
Peter Alan Pullan
Barry Clifford Scowen
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.)
Glory Global Solutions Holdings Ltd
Original Assignee
De la Rue International Ltd
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 De la Rue International Ltd filed Critical De la Rue International Ltd
Priority claimed from EP02250079A external-priority patent/EP1221679B1/fr
Publication of EP1353301A2 publication Critical patent/EP1353301A2/fr
Publication of EP1353301A3 publication Critical patent/EP1353301A3/fr
Application granted granted Critical
Publication of EP1353301B1 publication Critical patent/EP1353301B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/004—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using digital security elements, e.g. information coded on a magnetic thread or strip
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/04—Testing magnetic properties of the materials thereof, e.g. by detection of magnetic imprint

Definitions

  • the invention provides a method which allows a thread that is presented at an acute angle to the linear array of magnetic heads to be correctly read. By monitoring the output signals from only those heads within the array that are in close proximity to the thread, the method uses minimal processing time.
  • an apparatus for detecting a magnetic thread comprising an array of magnetic heads each of which is connected to a respective processor which processes signals generated by the associated magnetic head; and a processing system connected to the processors, the processing system being adapted to carry out a method according to the first aspect of the present invention.
  • the value of the thresholds of comparator 11a and 11b are determined by the microprocessor system 4 via output DAC[n]. This output is presented to a unity gain buffer 15 before being connected to the threshold input of comparator 11b.
  • the output of unity gain buffer 15 is also connected to potential divider 16 which reduces the threshold presented to comparator 11a by a factor of two.
  • Integrating peak detector 19 detects and stores the positive peak of the signal applied to it. This is presented to the microprocessor system 4 as signal PEAK[n]. The integrating peak detector 19 can be reset by asserting signal RESET [n] .
  • This signal is buffered by a unity gain inverter 15, the output of which determines a positive threshold.
  • This output is also potentially divided, for example by a factor of 2, using a potential divider 16 which sets a negative threshold.
  • the positive threshold may be set at four times the peak noise level, the negative threshold consequently being half this magnitude.
  • These thresholds may then be adapted and can be modified for each magnetic element scanned by the head. For example, the running average of the positive peak generated by a magnetic element could be calculated and used to determine a suitable positive threshold.
  • the value of the thresholds can be stored in a non-volatile memory so that they are not lost when the apparatus is switched off.
  • the microprocessor 4 will instruct the DSP 205 to go into calibration mode.
  • the DSP 205 takes 32 samples and generates an average absolute level. A threshold being a constant multiple of the average level is created and stored.
  • the DSP 205 examines the 32 samples to see if any exceed the calculated threshold. If so, calibration is reported as having failed otherwise calibration is a success and note processing can continue. The process is repeated for the remaining channels. If calibration has failed, the DSP 205 will report to the microprocessor 4 as being not ready and requires intervention.
  • a signal whose amplitude varies in a similar manner to the example above e.g. noise will produce a large number of peaks with a size 3 kernel whereas a substantially reduced number will be produced by the size 5 kernel. Since the peak transitions due to magnetic/non-magnetic boundaries take place over more than three samples, the size 5 kernel is sufficiently small enough to track these transitions whilst providing a level of noise immunity.
  • This resultant subset of the initial voltage peaks is processed to further remove any erroneous signals. This is done in part by assessing the relative locations, magnitudes and shapes of each peak with those of any other peaks in close spatial proximity to it. This ensures that peaks that occur because of an increase in magnetic flux in the detector are matched with those peaks that correspond to a decrease in magnetic flux in the detector. Because of the complex note dynamics that occur as a note passes a detector, situations can arise in which there is ambiguity as to how the peaks should be joined together. For example, two voltage maxima may occur with no voltage minima between them.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
EP03015595A 2001-01-08 2002-01-07 Lecteur de fil de sécurité magnétique Expired - Lifetime EP1353301B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB0100451.4A GB0100451D0 (en) 2001-01-08 2001-01-08 Method for reading coded magnetic threads
GB0100451 2001-01-08
GB0114212 2001-06-11
GBGB0114212.4A GB0114212D0 (en) 2001-01-08 2001-06-11 Magnetic thread reader
EP02250079A EP1221679B1 (fr) 2001-01-08 2002-01-07 Lecteur de fil de sécurité magnétique

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP02250079A Division EP1221679B1 (fr) 2001-01-08 2002-01-07 Lecteur de fil de sécurité magnétique

Publications (3)

Publication Number Publication Date
EP1353301A2 true EP1353301A2 (fr) 2003-10-15
EP1353301A3 EP1353301A3 (fr) 2003-10-22
EP1353301B1 EP1353301B1 (fr) 2006-11-02

Family

ID=9906433

Family Applications (2)

Application Number Title Priority Date Filing Date
EP03015597A Expired - Lifetime EP1353302B1 (fr) 2001-01-08 2002-01-07 Lecteur de fil de sécurité magnétique
EP03015595A Expired - Lifetime EP1353301B1 (fr) 2001-01-08 2002-01-07 Lecteur de fil de sécurité magnétique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP03015597A Expired - Lifetime EP1353302B1 (fr) 2001-01-08 2002-01-07 Lecteur de fil de sécurité magnétique

Country Status (3)

Country Link
EP (2) EP1353302B1 (fr)
GB (2) GB0100451D0 (fr)
PT (1) PT1353301E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8052145B2 (en) 2006-06-28 2011-11-08 De La Rue International Limited Document handling apparatus

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20040753A1 (it) * 2004-10-29 2005-01-29 Photovox S R L Testina magnetica modulare per la lettura di bande o fili magnetizzati
DE102008048043A1 (de) 2008-09-19 2010-03-25 Giesecke & Devrient Gmbh Kalibrieren eines Sensors zur Wertdokumentbearbeitung
WO2015147045A1 (fr) * 2014-03-27 2015-10-01 三菱電機株式会社 Dispositif de lecture d'informations et procédé de lecture d'informations
CN105160756A (zh) * 2015-08-18 2015-12-16 深圳怡化电脑股份有限公司 一种纸币面向识别方法与装置
DE102016015545A1 (de) 2016-12-27 2018-06-28 Giesecke+Devrient Currency Technology Gmbh Verfahren und Vorrichtung zum Detektieren eines Sicherheitsfadens in einem Wertdokument
GB2615816A (en) * 2022-02-21 2023-08-23 The Governor & Company Of The Bank Of England Document recognition device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2098768A (en) * 1981-04-13 1982-11-24 Bank Of England The Governor & Card readers
US5255129A (en) * 1989-09-22 1993-10-19 Jones Philip B Magnetic code reader with adjustable thresholds
US5378885A (en) * 1991-10-29 1995-01-03 Mars Incorporated Unshielded magnetoresistive head with multiple pairs of sensing elements
US5889271A (en) * 1994-11-18 1999-03-30 Webb; Martin John Method of reading a security thread
DE19921653A1 (de) * 1999-03-24 2000-09-28 Kraus Sicherheitstechnik Geldscheinsicherheitscodefaden

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2098768A (en) * 1981-04-13 1982-11-24 Bank Of England The Governor & Card readers
US5255129A (en) * 1989-09-22 1993-10-19 Jones Philip B Magnetic code reader with adjustable thresholds
US5378885A (en) * 1991-10-29 1995-01-03 Mars Incorporated Unshielded magnetoresistive head with multiple pairs of sensing elements
US5889271A (en) * 1994-11-18 1999-03-30 Webb; Martin John Method of reading a security thread
DE19921653A1 (de) * 1999-03-24 2000-09-28 Kraus Sicherheitstechnik Geldscheinsicherheitscodefaden

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8052145B2 (en) 2006-06-28 2011-11-08 De La Rue International Limited Document handling apparatus

Also Published As

Publication number Publication date
EP1353301B1 (fr) 2006-11-02
EP1353302B1 (fr) 2005-07-20
GB0100451D0 (en) 2001-02-21
EP1353301A3 (fr) 2003-10-22
GB0114212D0 (en) 2001-08-01
EP1353302A2 (fr) 2003-10-15
PT1353301E (pt) 2007-01-31
EP1353302A3 (fr) 2003-10-22

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