FR2431736A1 - Lecteur synchrone pour disques magnetiques a densites d'enregistrement multiples - Google Patents

Lecteur synchrone pour disques magnetiques a densites d'enregistrement multiples

Info

Publication number
FR2431736A1
FR2431736A1 FR7914616A FR7914616A FR2431736A1 FR 2431736 A1 FR2431736 A1 FR 2431736A1 FR 7914616 A FR7914616 A FR 7914616A FR 7914616 A FR7914616 A FR 7914616A FR 2431736 A1 FR2431736 A1 FR 2431736A1
Authority
FR
France
Prior art keywords
multiple recording
recording densities
magnetic discs
gain
calibration
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
FR7914616A
Other languages
English (en)
Other versions
FR2431736B1 (fr
Inventor
Albert L Anderson
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.)
Digital Equipment Corp
Original Assignee
Digital Equipment 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
Application filed by Digital Equipment Corp filed Critical Digital Equipment Corp
Publication of FR2431736A1 publication Critical patent/FR2431736A1/fr
Application granted granted Critical
Publication of FR2431736B1 publication Critical patent/FR2431736B1/fr
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
    • 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
    • G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
    • G11B5/016—Recording on, or reproducing or erasing from, magnetic disks using magnetic foils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/033—Speed or phase control by the received code signals, the signals containing no special synchronisation information using the transitions of the received signal to control the phase of the synchronising-signal-generating means, e.g. using a phase-locked loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

Lecteur synchrone pour disques magnétiques à densités d'enregistrement multiples. Au cours du préambule d'une zone de données à lire, la fermeture de commutateurs 146, 148 confère à un filtre de boucle 116 un grand gain assurant un calage rapide, à l'obtention duquel leur ouverture ramène ce gain à une valeur faible permettant de disposer pour lire les données d'une large plage de calage rendant inutile la précompensation des glissements de bits. Un signal MFM assure la sélection de densité en agissant sur un compteur 114 associé à l'oscillateur commandé 112 de la boucle. L'invention s'applique notamment à la mémorisation et à la restitution d'informations sous forme discrète sur support magnétique.
FR7914616A 1978-07-17 1979-06-07 Lecteur synchrone pour disques magnetiques a densites d'enregistrement multiples Expired FR2431736B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/925,534 US4231071A (en) 1978-07-17 1978-07-17 Reader for data recorded on magnetic disks at plural densities

Publications (2)

Publication Number Publication Date
FR2431736A1 true FR2431736A1 (fr) 1980-02-15
FR2431736B1 FR2431736B1 (fr) 1987-09-04

Family

ID=25451865

Family Applications (2)

Application Number Title Priority Date Filing Date
FR7914616A Expired FR2431736B1 (fr) 1978-07-17 1979-06-07 Lecteur synchrone pour disques magnetiques a densites d'enregistrement multiples
FR8003834A Withdrawn FR2444278A1 (fr) 1978-07-17 1980-02-21 Detecteur d'erreur de phase pour boucle a calage de phase pour lecteurs de disques magnetiques

Family Applications After (1)

Application Number Title Priority Date Filing Date
FR8003834A Withdrawn FR2444278A1 (fr) 1978-07-17 1980-02-21 Detecteur d'erreur de phase pour boucle a calage de phase pour lecteurs de disques magnetiques

Country Status (7)

Country Link
US (1) US4231071A (fr)
JP (2) JPS5532297A (fr)
AU (1) AU531795B2 (fr)
CA (1) CA1139435A (fr)
DE (1) DE2926525A1 (fr)
FR (2) FR2431736B1 (fr)
GB (1) GB2026288B (fr)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4357707A (en) * 1979-04-11 1982-11-02 Pertec Computer Corporation Digital phase lock loop for flexible disk data recovery system
JPS563421A (en) * 1979-06-21 1981-01-14 Canon Inc Signal converting device
US4298897A (en) * 1979-09-20 1981-11-03 International Business Machines Corporation Buffered recording
US4432025A (en) * 1981-05-29 1984-02-14 International Business Machines Corporation System and method for formatting pairs of concentric magnetic tracks of different capacity to a plurality of equal capacity logical tracks
GB2138227B (en) * 1983-04-12 1987-02-04 Sony Corp Digital video tape recorder apparatus
US4918677A (en) * 1985-01-23 1990-04-17 Canon Kabushiki Kaisha Information recording/reproducing apparatus including a plurality of recording or reproducing rates
JP2661062B2 (ja) * 1987-09-21 1997-10-08 ソニー株式会社 データ再生装置
US4845575A (en) * 1987-10-06 1989-07-04 Standard Microsystems Corporation Analog floppy disk data separator
US5045956A (en) * 1987-12-01 1991-09-03 Matsushita Electric Industrial Co., Ltd. Data reproducing apparatus
EP0341834B1 (fr) * 1988-05-12 1993-09-15 Digital Equipment Corporation Boucle de verrouillage de phase avec balayage de la largeur de bande
US4872073A (en) * 1988-09-02 1989-10-03 Ampex Corporation Apparatus for playback of magnetically recorded data having a variable input rate
US5036409A (en) * 1989-03-15 1991-07-30 Deutsche Thomson-Brandt Gmbh Signal selection arrangement
US5272730A (en) * 1991-12-20 1993-12-21 Vlsi Technology, Inc. Digital phase-locked loop filter
US5297185A (en) * 1992-02-13 1994-03-22 North American Philips Corporation Pattern detection and synchronization circuit
JP2574106B2 (ja) * 1992-09-01 1997-01-22 富士通株式会社 磁気ディスク装置のクロック再生回路
EP0593021B1 (fr) * 1992-10-14 1998-09-16 Sony Corporation Appareil à disque magnétique
US5812619A (en) * 1996-02-28 1998-09-22 Advanced Micro Devices, Inc. Digital phase lock loop and system for digital clock recovery
DE69623284T2 (de) * 1996-09-24 2003-04-17 Hewlett Packard Co Datenverarbeitungsgerät und -verfahren
US5768235A (en) * 1996-10-08 1998-06-16 Imation Corp. Control signal for recording a disc according to a clock signal, data signal, and an index signal
KR100289404B1 (ko) * 1998-05-15 2001-05-02 김영환 국소대칭강제파형부를 이용한 패턴지터를 줄이는 장치 및 방법
US7664214B2 (en) * 2002-09-24 2010-02-16 Standard Microsystems Corporation System and method for transferring data among transceivers substantially void of data dependent jitter
US20040228411A1 (en) * 2003-05-12 2004-11-18 Sony Corporation Method and system for decoder clock control in presence of jitter
US7751436B2 (en) * 2005-05-24 2010-07-06 Sony Corporation System and method for dynamically establishing PLL speed based on receive buffer data accumulation for streaming video
JP2008204504A (ja) * 2007-02-16 2008-09-04 Showa Denko Kk サーティファイ検査装置およびサーティファイ検査方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898580A (en) * 1973-12-17 1975-08-05 Xerox Corp Dual time constant phase lock oscillator
US3947876A (en) * 1975-01-06 1976-03-30 C. J. Kennedy Company Dual density 800 bpi NRZI and 1600 bpi PE read circuit for a digital magnetic tape transport
US3993958A (en) * 1975-08-20 1976-11-23 Rca Corporation Fast acquisition circuit for a phase locked loop
FR2362528A1 (fr) * 1976-08-20 1978-03-17 Philips Nv Boucle a verrouillage de phase, munie d'un filtre commutable
US4143407A (en) * 1977-06-17 1979-03-06 Trw Inc. Magnetic data storage and retrieval system
US4151565A (en) * 1976-05-20 1979-04-24 Ing. C. Olivetti & C., S.P.A. Discrimination during reading of data prerecorded in different codes

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3222659A (en) * 1961-06-30 1965-12-07 Ibm Variable density data recording utilizing normal skew characteristics
US3689903A (en) * 1970-10-16 1972-09-05 Honeywell Inc Voltage controlled oscillator with constrained period of frequency change
US3753143A (en) * 1971-08-05 1973-08-14 Honeywell Inf Systems Phase locked oscillator for integer pulse rates
US3810234A (en) * 1972-08-21 1974-05-07 Memorex Corp Data recovery circuit
US3778793A (en) * 1972-09-11 1973-12-11 Hitachi Ltd Clocking system for magnetic memory
US3940790A (en) * 1973-02-13 1976-02-24 Honeywell Information Systems, Inc. System for control of read/write on magnetic tape
US3864740A (en) * 1973-11-05 1975-02-04 Information Storage Systems Track following servo system
US3944940A (en) * 1974-09-06 1976-03-16 Pertec Corporation Versatile phase-locked loop for read data recovery
US3922613A (en) * 1975-01-02 1975-11-25 Honeywell Inf Systems Information detection apparatus having an adaptive digital tracking oscillator
JPS5836404B2 (ja) * 1976-06-29 1983-08-09 株式会社日立製作所 磁気テ−プ読取制御方式
JPS533765A (en) * 1976-06-30 1978-01-13 Matsushita Electric Ind Co Ltd Phase synchronous oscillating unit
JPS607417B2 (ja) * 1976-12-29 1985-02-25 富士通株式会社 位相同期回路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898580A (en) * 1973-12-17 1975-08-05 Xerox Corp Dual time constant phase lock oscillator
US3947876A (en) * 1975-01-06 1976-03-30 C. J. Kennedy Company Dual density 800 bpi NRZI and 1600 bpi PE read circuit for a digital magnetic tape transport
US3993958A (en) * 1975-08-20 1976-11-23 Rca Corporation Fast acquisition circuit for a phase locked loop
US4151565A (en) * 1976-05-20 1979-04-24 Ing. C. Olivetti & C., S.P.A. Discrimination during reading of data prerecorded in different codes
FR2362528A1 (fr) * 1976-08-20 1978-03-17 Philips Nv Boucle a verrouillage de phase, munie d'un filtre commutable
US4143407A (en) * 1977-06-17 1979-03-06 Trw Inc. Magnetic data storage and retrieval system

Also Published As

Publication number Publication date
AU4641979A (en) 1980-01-24
CA1139435A (fr) 1983-01-11
JPS5532297A (en) 1980-03-06
JPS63177368A (ja) 1988-07-21
US4231071A (en) 1980-10-28
AU531795B2 (en) 1983-09-08
JPH0465474B2 (fr) 1992-10-20
GB2026288B (en) 1982-10-13
FR2444278A1 (fr) 1980-07-11
DE2926525A1 (de) 1980-02-07
GB2026288A (en) 1980-01-30
FR2431736B1 (fr) 1987-09-04

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Legal Events

Date Code Title Description
ST Notification of lapse