DE2534456C2 - Lesevorrichtung - Google Patents

Lesevorrichtung

Info

Publication number
DE2534456C2
DE2534456C2 DE2534456A DE2534456A DE2534456C2 DE 2534456 C2 DE2534456 C2 DE 2534456C2 DE 2534456 A DE2534456 A DE 2534456A DE 2534456 A DE2534456 A DE 2534456A DE 2534456 C2 DE2534456 C2 DE 2534456C2
Authority
DE
Germany
Prior art keywords
bit
output
bit stream
irregular
scanning
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
DE2534456A
Other languages
German (de)
English (en)
Other versions
DE2534456A1 (de
Inventor
Robert Joseph Jackson N.J. D'Orazio
Gerald Steven Brooklyn N.Y. Soloway
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of DE2534456A1 publication Critical patent/DE2534456A1/de
Application granted granted Critical
Publication of DE2534456C2 publication Critical patent/DE2534456C2/de
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
DE2534456A 1974-08-02 1975-08-01 Lesevorrichtung Expired DE2534456C2 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US494030A US3898689A (en) 1974-08-02 1974-08-02 Code converter

Publications (2)

Publication Number Publication Date
DE2534456A1 DE2534456A1 (de) 1976-02-19
DE2534456C2 true DE2534456C2 (de) 1983-08-04

Family

ID=23962729

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2534456A Expired DE2534456C2 (de) 1974-08-02 1975-08-01 Lesevorrichtung

Country Status (10)

Country Link
US (1) US3898689A (https=)
JP (1) JPS5913070B2 (https=)
BE (1) BE831883A (https=)
CA (1) CA1059238A (https=)
DE (1) DE2534456C2 (https=)
ES (1) ES439928A1 (https=)
FR (1) FR2281011A1 (https=)
IT (1) IT1041439B (https=)
NL (1) NL181606C (https=)
SE (1) SE409149B (https=)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4176259A (en) * 1976-10-04 1979-11-27 Honeywell Information Systems, Inc. Read apparatus
US4174891A (en) * 1976-11-15 1979-11-20 Bell & Howell Company Microfilm reader/printer
CH616254A5 (https=) * 1977-06-21 1980-03-14 Landis & Gyr Ag
US4705939A (en) * 1984-09-28 1987-11-10 Rjs Enterprises, Inc. Apparatus and method for optically measuring bar code dimensions
US5268562A (en) * 1990-03-30 1993-12-07 National Film Board Of Canada Optical dual sensor bar code scanning system
US5780828A (en) * 1996-02-15 1998-07-14 Dh Technology, Inc. Interactive video systems
US5770846A (en) * 1996-02-15 1998-06-23 Mos; Robert Method and apparatus for securing and authenticating encoded data and documents containing such data
US6931075B2 (en) * 2001-04-05 2005-08-16 Microchip Technology Incorporated Event detection with a digital processor
US6722567B2 (en) * 2001-06-07 2004-04-20 Hewlett-Packard Development Company, L.P. Generating and decoding graphical bar codes
US7577551B2 (en) * 2006-06-07 2009-08-18 Gm Global Technology Operations, Inc. Method, product and device for coding event history

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4912645B1 (https=) * 1969-04-21 1974-03-26
US3720927A (en) * 1971-01-25 1973-03-13 Redactron Corp Speed insensitive reading and writing apparatus for digital information
US3796862A (en) * 1971-09-27 1974-03-12 Ncr Bar code reader
US3862400A (en) * 1972-03-31 1975-01-21 Electronics Corp America Sensing system for bar patterns
US3763351A (en) * 1972-07-14 1973-10-02 Ibm Bar code scanner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NICHTS-ERMITTELT

Also Published As

Publication number Publication date
IT1041439B (it) 1980-01-10
FR2281011A1 (fr) 1976-02-27
NL7509215A (nl) 1976-02-04
US3898689A (en) 1975-08-05
NL181606C (nl) 1987-09-16
DE2534456A1 (de) 1976-02-19
ES439928A1 (es) 1977-03-01
JPS5913070B2 (ja) 1984-03-27
JPS5140909A (https=) 1976-04-06
BE831883A (fr) 1975-11-17
NL181606B (nl) 1987-04-16
FR2281011B1 (https=) 1979-03-30
SE409149B (sv) 1979-07-30
SE7508250L (sv) 1976-02-03
CA1059238A (en) 1979-07-24

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Legal Events

Date Code Title Description
8110 Request for examination paragraph 44
8128 New person/name/address of the agent

Representative=s name: BLUMBACH, P., DIPL.-ING., 6200 WIESBADEN WESER, W.

8180 Miscellaneous part 1

Free format text: DER VERTRETER LAUTET RICHTIG: BLUMBACH, P., DIPL.-ING., 6200 WIESBADEN WESER, W., DIPL.-PHYS. DR.RER.NAT., 8000 MUENCHEN ZWIRNER, G., DIPL.-ING. DIPL.-WIRTSCH.-ING., PAT.-ANWAELTE, 6200 WIESBADEN

D2 Grant after examination
8364 No opposition during term of opposition