GB1467877A - Demodulation system for digital information - Google Patents

Demodulation system for digital information

Info

Publication number
GB1467877A
GB1467877A GB2716374A GB2716374A GB1467877A GB 1467877 A GB1467877 A GB 1467877A GB 2716374 A GB2716374 A GB 2716374A GB 2716374 A GB2716374 A GB 2716374A GB 1467877 A GB1467877 A GB 1467877A
Authority
GB
United Kingdom
Prior art keywords
signal
counter
pulse
oscillator
duration
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
GB2716374A
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.)
Toppan Infomedia Co Ltd
Original Assignee
Tokyo Magnetic Printing Co 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 Tokyo Magnetic Printing Co Ltd filed Critical Tokyo Magnetic Printing Co Ltd
Publication of GB1467877A publication Critical patent/GB1467877A/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
    • 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)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Dc Digital Transmission (AREA)
GB2716374A 1973-11-27 1974-06-19 Demodulation system for digital information Expired GB1467877A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48132137A JPS5085320A (OSRAM) 1973-11-27 1973-11-27

Publications (1)

Publication Number Publication Date
GB1467877A true GB1467877A (en) 1977-03-23

Family

ID=15074220

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2716374A Expired GB1467877A (en) 1973-11-27 1974-06-19 Demodulation system for digital information

Country Status (4)

Country Link
US (1) US3949313A (OSRAM)
JP (1) JPS5085320A (OSRAM)
DE (1) DE2427225C3 (OSRAM)
GB (1) GB1467877A (OSRAM)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2189063A (en) * 1986-04-11 1987-10-14 Ampex Apparatus for reading bar codes under rapidly changing scanning speed conditions
GB2216316A (en) * 1988-02-16 1989-10-04 Mr Sensors Ltd Decoding recorded data

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4053736A (en) * 1976-04-02 1977-10-11 Burroughs Corporation Digital rate compensator for a card reader
US4176259A (en) * 1976-10-04 1979-11-27 Honeywell Information Systems, Inc. Read apparatus
US4104682A (en) * 1977-03-07 1978-08-01 Burroughs Corporation Apparatus for reducing the number of undetected errors read along the length of a binary information bearing medium
SE405179B (sv) * 1977-04-19 1978-11-20 Datasaab Ab Sett och anordning for lesning av data
JPS5446020A (en) * 1977-09-19 1979-04-11 Sony Corp Demodulation circuit
US4219152A (en) * 1979-02-21 1980-08-26 International Business Machines Corporation Dual threshold comparator circuit
US4264934A (en) * 1979-04-23 1981-04-28 Bell Telephone Laboratories, Incorporated Rate adaptive writer for a card having a magnetizable surface
US4373135A (en) * 1979-12-31 1983-02-08 Spartanics, Ltd. Pitch matching detecting and counting system
JPS56106421A (en) * 1980-01-29 1981-08-24 Nippon Hoso Kyokai <Nhk> Constant ratio delay circuit
US4485347A (en) * 1980-09-04 1984-11-27 Mitsubishi Denki Kabushiki Kaisha Digital FSK demodulator
JPS5789769A (en) * 1980-11-26 1982-06-04 Nippon Denso Co Ltd Controller for copying machine group
US4965825A (en) 1981-11-03 1990-10-23 The Personalized Mass Media Corporation Signal processing apparatus and methods
USRE47642E1 (en) 1981-11-03 2019-10-08 Personalized Media Communications LLC Signal processing apparatus and methods
US7831204B1 (en) 1981-11-03 2010-11-09 Personalized Media Communications, Llc Signal processing apparatus and methods
US4638359A (en) * 1983-05-19 1987-01-20 Westinghouse Electric Corp. Remote control switching of television sources
US4540947A (en) * 1983-06-22 1985-09-10 Akira Fujimoto FM Signal demodulating apparatus
NL8302230A (nl) * 1983-06-22 1985-01-16 Staalkat Bv Telinrichting voor het tellen van voorwerpen door middel van een schaduwmeting.
JPS62262275A (ja) * 1986-05-07 1987-11-14 Fujitsu Ltd 磁気カ−ドリ−ダ
US4757520A (en) * 1986-12-03 1988-07-12 Akira Fujimoto FM signal demodulating apparatus
GB8703769D0 (en) * 1987-02-18 1987-03-25 Thorn Emi Datatech Ltd Circuit
FR2635606B1 (fr) * 1988-08-17 1995-06-30 France Etat Procede de lecture d'un code temporel longitudinal et dispositif pour la mise en oeuvre d'un tel procede
GB9209535D0 (en) * 1992-05-01 1992-06-17 Questech Ltd Data signal decoding device
JPH06216778A (ja) * 1993-01-14 1994-08-05 Mitsubishi Electric Corp 通信制御装置の復調回路
US7881409B2 (en) * 2004-01-22 2011-02-01 The Regents Of The University Of Michigan Demodulator, chip and method for digitally demodulating an FSK signal

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243580A (en) * 1960-12-06 1966-03-29 Sperry Rand Corp Phase modulation reading system
US3418433A (en) * 1964-12-14 1968-12-24 Minnesota Mining & Mfg Method and system for processing analog information
US3532999A (en) * 1969-01-14 1970-10-06 Ibm Reference clock generator having unequal adjacent period intervals
US3601710A (en) * 1969-08-22 1971-08-24 Bell Telephone Labor Inc Digital detector for binary fsk signaling
US3602828A (en) * 1969-10-27 1971-08-31 Ibm Self-clocking detection system
US3590280A (en) * 1969-11-18 1971-06-29 Westinghouse Electric Corp Variable multiphase clock system
US3805175A (en) * 1970-04-27 1974-04-16 Ibm Retrospective pulse modulation decoding method and apparatus
US3683288A (en) * 1970-07-31 1972-08-08 Texas Instruments Inc Frequency modulation demodulator
JPS5326487B2 (OSRAM) * 1972-02-03 1978-08-02

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2189063A (en) * 1986-04-11 1987-10-14 Ampex Apparatus for reading bar codes under rapidly changing scanning speed conditions
GB2189063B (en) * 1986-04-11 1990-04-04 Ampex Method and apparatus for reading bar code under rapidly changing scanning speed conditions
GB2216316A (en) * 1988-02-16 1989-10-04 Mr Sensors Ltd Decoding recorded data
GB2216316B (en) * 1988-02-16 1992-05-13 Mr Sensors Ltd Reading and decoding recorded data

Also Published As

Publication number Publication date
DE2427225C3 (de) 1980-11-20
US3949313A (en) 1976-04-06
DE2427225B2 (OSRAM) 1980-03-13
DE2427225A1 (de) 1975-06-05
JPS5085320A (OSRAM) 1975-07-09

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19940618