GB1529566A - Magnetic recording - Google Patents

Magnetic recording

Info

Publication number
GB1529566A
GB1529566A GB4474774A GB4474774A GB1529566A GB 1529566 A GB1529566 A GB 1529566A GB 4474774 A GB4474774 A GB 4474774A GB 4474774 A GB4474774 A GB 4474774A GB 1529566 A GB1529566 A GB 1529566A
Authority
GB
United Kingdom
Prior art keywords
tape
watermarked
magnetic
oct
detected
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
Application number
GB4474774A
Other languages
English (en)
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB4474774A priority Critical patent/GB1529566A/en
Priority to DE19752545580 priority patent/DE2545580A1/de
Priority to FR7531358A priority patent/FR2288369A1/fr
Priority to NL7512181A priority patent/NL7512181A/xx
Priority to JP50124866A priority patent/JPS5165605A/ja
Publication of GB1529566A publication Critical patent/GB1529566A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/28—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs
    • G11B23/281—Indicating or preventing prior or unauthorised use, e.g. cassettes with sealing or locking means, write-protect devices for discs by changing the physical properties of the record carrier
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; 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
    • G06K19/02—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00094—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers
    • G11B20/00123—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which result in a restriction to authorised record carriers the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/30—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture with provision for auxiliary signals
    • G11B23/36—Signals on record carriers or on containers and recorded by the same method as the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/62—Record carriers characterised by the selection of the material
    • G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
    • G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
    • G11B5/842—Coating a support with a liquid magnetic dispersion
    • G11B5/845—Coating a support with a liquid magnetic dispersion in a magnetic field

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
GB4474774A 1974-10-16 1974-10-16 Magnetic recording Expired GB1529566A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB4474774A GB1529566A (en) 1974-10-16 1974-10-16 Magnetic recording
DE19752545580 DE2545580A1 (de) 1974-10-16 1975-10-11 Magnetischer aufzeichnungstraeger, verfahren zu dessen herstellung und informationsaufzeichnungssystem
FR7531358A FR2288369A1 (fr) 1974-10-16 1975-10-14 Enregistrement magnetique
NL7512181A NL7512181A (nl) 1974-10-16 1975-10-16 Magnetisch optekenmedium en werkwijze voor de vervaardiging ervan.
JP50124866A JPS5165605A (enrdf_load_stackoverflow) 1974-10-16 1975-10-16

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4474774A GB1529566A (en) 1974-10-16 1974-10-16 Magnetic recording
GB254675 1975-01-21

Publications (1)

Publication Number Publication Date
GB1529566A true GB1529566A (en) 1978-10-25

Family

ID=26237585

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4474774A Expired GB1529566A (en) 1974-10-16 1974-10-16 Magnetic recording

Country Status (5)

Country Link
JP (1) JPS5165605A (enrdf_load_stackoverflow)
DE (1) DE2545580A1 (enrdf_load_stackoverflow)
FR (1) FR2288369A1 (enrdf_load_stackoverflow)
GB (1) GB1529566A (enrdf_load_stackoverflow)
NL (1) NL7512181A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0067178A4 (en) * 1980-12-16 1983-02-09 Minnesota Mining Mfg Australia METHOD AND DEVICE FOR VERIFYING RECORDED MESSAGES.

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242400A (en) * 1977-10-15 1980-12-30 E M I Limited Magnetically structured materials
JPS5552564A (en) * 1978-10-13 1980-04-17 Sony Corp Check unit for suitability of stuck label of tape cassette
DE2922882A1 (de) * 1979-06-06 1980-12-11 Stockburger H Verfahren zur sicherung von tontraegern und deren etiketten und/oder verpackung gegen nachahmung
FR2515403A1 (fr) * 1981-10-28 1983-04-29 Quadrivium Inf Procede d'identification d'un enregistrement sonore et installation de duplication mettant en oeuvre le procede
FR2534433B1 (fr) * 1982-10-08 1986-04-11 Thomson Csf Procede de protection d'une sequence d'images video contre une utilisation frauduleuse et dispositifs pour la mise en oeuvre de ce procede
DE3319343A1 (de) * 1982-11-08 1984-05-10 Vault Corp Verfahren und vorrichtung zur unmoeglichmachung nichtgenehmigter kopien von aufgezeichneten daten
EP0110511B1 (en) * 1982-11-22 1988-03-02 Dysan Corporation Method and apparatus for authenticating memory disk
AT378620B (de) * 1983-08-11 1985-09-10 Heinz Seidl Magnetogrammtraeger, dessen herkunft unentfernbar gekennzeichnet ist
JPH0512068Y2 (enrdf_load_stackoverflow) * 1985-02-27 1993-03-26
JPH0512067Y2 (enrdf_load_stackoverflow) * 1985-02-27 1993-03-26
DE3676022D1 (de) * 1985-03-18 1991-01-17 Mcwhirter Holdings Pty Ltd Magnetische bandkassette mit einem vorher aufgezeichneten tonfrequenzsignal.
JP2569294Y2 (ja) * 1991-01-25 1998-04-22 日産自動車株式会社 線条体用プロテクター

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0067178A4 (en) * 1980-12-16 1983-02-09 Minnesota Mining Mfg Australia METHOD AND DEVICE FOR VERIFYING RECORDED MESSAGES.

Also Published As

Publication number Publication date
NL7512181A (nl) 1976-04-21
JPS5165605A (enrdf_load_stackoverflow) 1976-06-07
DE2545580A1 (de) 1976-05-06
FR2288369A1 (fr) 1976-05-14

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19951001