FR1453195A - Data logging system - Google Patents

Data logging system

Info

Publication number
FR1453195A
FR1453195A FR38070A FR38070A FR1453195A FR 1453195 A FR1453195 A FR 1453195A FR 38070 A FR38070 A FR 38070A FR 38070 A FR38070 A FR 38070A FR 1453195 A FR1453195 A FR 1453195A
Authority
FR
France
Prior art keywords
data logging
logging system
data
logging
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
FR38070A
Other languages
French (fr)
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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
Priority claimed from US412776A external-priority patent/US3356934A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to FR38070A priority Critical patent/FR1453195A/en
Application granted granted Critical
Publication of FR1453195A publication Critical patent/FR1453195A/en
Expired 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
    • G06K7/01—Details
    • G06K7/016—Synchronisation of sensing process
    • G06K7/0166—Synchronisation of sensing process by means of clock-signals derived from the code marks, e.g. self-clocking code
    • 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
    • G11B20/14—Digital recording or reproducing using self-clocking codes
    • G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
    • G11B20/1407—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol
    • G11B20/1419—Digital recording or reproducing using self-clocking codes characterised by the use of two levels code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
FR38070A 1964-11-20 1965-11-12 Data logging system Expired FR1453195A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR38070A FR1453195A (en) 1964-11-20 1965-11-12 Data logging system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US412776A US3356934A (en) 1964-11-20 1964-11-20 Double frequency recording system
FR38070A FR1453195A (en) 1964-11-20 1965-11-12 Data logging system

Publications (1)

Publication Number Publication Date
FR1453195A true FR1453195A (en) 1966-04-15

Family

ID=26167350

Family Applications (1)

Application Number Title Priority Date Filing Date
FR38070A Expired FR1453195A (en) 1964-11-20 1965-11-12 Data logging system

Country Status (1)

Country Link
FR (1) FR1453195A (en)

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