FR2344091A1 - Readout unit for flexible data discs - operates with read information supplied to series-parallel register - Google Patents

Readout unit for flexible data discs - operates with read information supplied to series-parallel register

Info

Publication number
FR2344091A1
FR2344091A1 FR7606830A FR7606830A FR2344091A1 FR 2344091 A1 FR2344091 A1 FR 2344091A1 FR 7606830 A FR7606830 A FR 7606830A FR 7606830 A FR7606830 A FR 7606830A FR 2344091 A1 FR2344091 A1 FR 2344091A1
Authority
FR
France
Prior art keywords
series
flexible data
operates
register
input
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
FR7606830A
Other languages
French (fr)
Other versions
FR2344091B1 (en
Inventor
Jean-Pierre Bournas
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.)
Radiotechnique Compelec RTC SA
Original Assignee
Radiotechnique Compelec RTC SA
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 Radiotechnique Compelec RTC SA filed Critical Radiotechnique Compelec RTC SA
Priority to FR7606830A priority Critical patent/FR2344091A1/en
Publication of FR2344091A1 publication Critical patent/FR2344091A1/en
Application granted granted Critical
Publication of FR2344091B1 publication Critical patent/FR2344091B1/fr
Granted 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

The read-out unit is used for flexible data discs on which logic information is recorded by frequency doubling with each cell of the binary information element enclosed by a clock bit. The information read from the disc is fed to a series/parallel register (4), pref. with a capacity of 16 bits. The register (4) has a clock input (3) directly connected to the read-out head (1), a reset input (5) connected to a monostable circuit (2), a third input (6) for the logic level '1' and a fourth input (7) for the logic level '0'. The parallel outputs of the register (4) are coupled to a decoer circuit (8).
FR7606830A 1976-03-10 1976-03-10 Readout unit for flexible data discs - operates with read information supplied to series-parallel register Granted FR2344091A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7606830A FR2344091A1 (en) 1976-03-10 1976-03-10 Readout unit for flexible data discs - operates with read information supplied to series-parallel register

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7606830A FR2344091A1 (en) 1976-03-10 1976-03-10 Readout unit for flexible data discs - operates with read information supplied to series-parallel register

Publications (2)

Publication Number Publication Date
FR2344091A1 true FR2344091A1 (en) 1977-10-07
FR2344091B1 FR2344091B1 (en) 1981-11-27

Family

ID=9170218

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7606830A Granted FR2344091A1 (en) 1976-03-10 1976-03-10 Readout unit for flexible data discs - operates with read information supplied to series-parallel register

Country Status (1)

Country Link
FR (1) FR2344091A1 (en)

Also Published As

Publication number Publication date
FR2344091B1 (en) 1981-11-27

Similar Documents

Publication Publication Date Title
DK1152423T3 (en) Plates Production Equipment
KR890001465B1 (en) Method of recording a digital information signal on a record carrier
KR880002178A (en) Rotating head type recording and reproducing apparatus
FR2344091A1 (en) Readout unit for flexible data discs - operates with read information supplied to series-parallel register
JPS6417554A (en) Facsimile equipment
JPS57181429A (en) Optical disc device
JPS55108915A (en) Disc pack device
JPS5737711A (en) Moving head type disk device
JPS55138950A (en) Digital signal modulation and demodulation system
JPS5492717A (en) Magnetic storage-reproducer
JPS5320911A (en) Magnetic recording information reading system
SU444241A1 (en) Memory device
JPS556957A (en) Multiplex parallel-serial conversion system using memory
SU699552A1 (en) Device for reproducing digital information from magnetic carrier
SU805408A1 (en) Device for recording and reproducing digital information
JPS5755466A (en) Storage device
SU1300514A1 (en) Device for reading information from punched tape
JPS6442070A (en) Digital recording and reproducing device
SU586496A1 (en) Magnetic storage element
JPS52120808A (en) Writing and reading system for digital signals
FR2420250A1 (en) CIRCUIT AND PROCEDURE FOR MODIFIED PHASE MODULATION DATA CODING, WITH WRITING PRECOMPENSATION
GB908547A (en) Improvements in and relating to magnetic recording and reproduction
JPS5740707A (en) Magnetic tape device
SU576587A1 (en) Magnetic digital recording apparatus
SU614445A1 (en) Pneumatic information readout device

Legal Events

Date Code Title Description
ST Notification of lapse