DK614386A - AUTOMATIC CORRECTION SYSTEM FOR THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER - Google Patents

AUTOMATIC CORRECTION SYSTEM FOR THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER

Info

Publication number
DK614386A
DK614386A DK614386A DK614386A DK614386A DK 614386 A DK614386 A DK 614386A DK 614386 A DK614386 A DK 614386A DK 614386 A DK614386 A DK 614386A DK 614386 A DK614386 A DK 614386A
Authority
DK
Denmark
Prior art keywords
virtue
fact
scanning
circuit
anomalies
Prior art date
Application number
DK614386A
Other languages
Danish (da)
Other versions
DK614386D0 (en
DK166055B (en
DK166055C (en
Inventor
Dieter Baas
Werner Nutz
Original Assignee
Thomson Brandt Gmbh
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 Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of DK614386A publication Critical patent/DK614386A/en
Publication of DK614386D0 publication Critical patent/DK614386D0/en
Publication of DK166055B publication Critical patent/DK166055B/en
Application granted granted Critical
Publication of DK166055C publication Critical patent/DK166055C/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0946—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G11B21/106—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on disks
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0948—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Communication System (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

The automatic correction system for the servo-circuit in a device with optical scanning of a rotating information support has a known servo-circuit which detects anomalies in the scanning system 1, to the outputs of which a gate circuit is connected, and which provides as necessary a mute control signal to the decoder 2 connected to the scanning system 1 and thus mute-controls its outputs. According to the invention, anomalies in scanning caused by external influences and/or disc faults, such as scratches, can to a great extent be weakened in terms of their disruptive appearance by virtue of the fact that a triggering criterion for correction signals can be produced, in the event of anomalies, by sequential address comparison. This is achieved by virtue of the fact that a comparator 6 on each occasion compares newly read data with preceding information, which is temporarily stored in a latch circuit 7, and by virtue of the fact that a preliminary indication is held ready in the form of a measurement window δ D in order to determine whether the comparison lies outside the measurement window and in order then to emit a correction signal from the comparator 6 to the servo system 3, and by virtue of the fact that the latter returns the scanning system 1 to the last valid scanning point. <IMAGE>
DK614386A 1985-04-18 1986-12-18 A PROCEDURE AND A CIRCUIT FOR AUTOMATIC CORRECTION OF THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER. DK166055C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3514035 1985-04-18
DE19853514035 DE3514035A1 (en) 1985-04-18 1985-04-18 AUTOMATIC CORRECTION SYSTEM FOR THE SERVO CIRCUIT OF A DEVICE WITH OPTICAL SCANNING OF A ROTATING INFORMATION CARRIER
PCT/EP1986/000223 WO1986006200A1 (en) 1985-04-18 1986-04-17 Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support
EP8600223 1986-04-17

Publications (4)

Publication Number Publication Date
DK614386A true DK614386A (en) 1986-12-18
DK614386D0 DK614386D0 (en) 1986-12-18
DK166055B DK166055B (en) 1993-03-01
DK166055C DK166055C (en) 1993-07-12

Family

ID=6268493

Family Applications (1)

Application Number Title Priority Date Filing Date
DK614386A DK166055C (en) 1985-04-18 1986-12-18 A PROCEDURE AND A CIRCUIT FOR AUTOMATIC CORRECTION OF THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER.

Country Status (8)

Country Link
EP (1) EP0221936B1 (en)
JP (1) JPH0785344B2 (en)
KR (1) KR970006831B1 (en)
AT (1) ATE57785T1 (en)
DE (2) DE3514035A1 (en)
DK (1) DK166055C (en)
HK (1) HK176795A (en)
WO (1) WO1986006200A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3862875B2 (en) * 1998-10-29 2006-12-27 パイオニア株式会社 Disc player
AU2003230135A1 (en) * 2002-05-21 2003-12-02 Koninklijke Philips Electronics N.V. Optical disk system with improved playability

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307418A (en) * 1979-10-12 1981-12-22 Rca Corporation Video disc player system for correlating stylus position with information previously detected from disc
US4313134A (en) * 1979-10-12 1982-01-26 Rca Corporation Track error correction system as for video disc player
JPS57104386A (en) * 1980-12-19 1982-06-29 Trio Kenwood Corp Video disc playback device
US4488278A (en) * 1982-08-17 1984-12-11 Rca Corporation Coding system for digital audio disc record
JPS5936385A (en) * 1982-08-20 1984-02-28 Matsushita Electric Ind Co Ltd Reading circuit of track address
JPS59117762A (en) * 1982-12-24 1984-07-07 Nippon Columbia Co Ltd Disc reproducing device
JPS59167879A (en) * 1983-03-15 1984-09-21 Toshiba Corp Detector of track jump in disc record reproducing system
JPS59201274A (en) * 1983-04-27 1984-11-14 Sony Corp Disk reproducing device
JPS607658A (en) * 1983-06-24 1985-01-16 Victor Co Of Japan Ltd Method for correcting address of disc-like information recording medium
JPS6043270A (en) * 1983-08-19 1985-03-07 Sony Corp Disk player
NL8303565A (en) * 1983-10-17 1985-05-17 Philips Nv Apparatus for displaying information from a plate-shaped optically readable record carrier.

Also Published As

Publication number Publication date
KR880700408A (en) 1988-03-15
EP0221936B1 (en) 1990-10-24
DK614386D0 (en) 1986-12-18
DK166055B (en) 1993-03-01
JPH0785344B2 (en) 1995-09-13
WO1986006200A1 (en) 1986-10-23
KR970006831B1 (en) 1997-04-30
JPS62502003A (en) 1987-08-06
DE3675150D1 (en) 1990-11-29
EP0221936A1 (en) 1987-05-20
HK176795A (en) 1995-11-24
DK166055C (en) 1993-07-12
ATE57785T1 (en) 1990-11-15
DE3514035A1 (en) 1986-10-23

Similar Documents

Publication Publication Date Title
DK449182A (en) DEVICE FOR THE VALIDITY OF MONTHS
DE3370393D1 (en) Disc playback apparatus
EP0378394A3 (en) Track counter for optical disk
DE3570545D1 (en) Apparatus for recording and/or reading information in/from a track of a reflecting record carrier, which apparatus comprises a focusing control system with reduced spot-offset sensitivity
ATE141435T1 (en) OPTICAL SCANNING DEVICE
ATE157796T1 (en) OPTICAL SCANNING DEVICE
DK614386A (en) AUTOMATIC CORRECTION SYSTEM FOR THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER
KR910006933A (en) Optical tape recorder
KR940012289A (en) Tracking servo circuit
DK614286A (en) AUTOMATIC CORRECTION SYSTEM FOR THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER
AU585764B2 (en) Apparatus for enabling an autotrack circuit of an optical disc reading apparatus during the positioning of a read beam
MY123401A (en) Apparatus for reading from or writing to optical recording media
JPS6443845A (en) Optical information recording and reproducing device
DE69021889D1 (en) TRACK CONTROL SYSTEM FOR AN OPTICAL RECORDING AND SCANING UNIT.
DE59008679D1 (en) DETECTION CIRCUIT.
JP2774516B2 (en) Disk defect detection circuit
SE9001955L (en) FOERBAETTRAD ACOUSTIC STORAGE DEFECT DETECTOR
JPS54123918A (en) Automatic focus control unit in optical reproducer of information recording medium discs
JPH05205308A (en) Recording carrier scanning device
JPS6459640A (en) Optical information recording and reproducing device
KR980004736A (en) Error Detection Device in Optical Disc Playback System
ATE191580T1 (en) AUTOMATIC DISTINCTION OF SAMPLING MODES WITH WHICH VIDEO SIGNALS HAVE BEEN RECORDED
KR980004528A (en) Vysial recording status check device
JPS6488720A (en) Automatic traveling vehicle
JPS57142094A (en) Optical information recorder and reproducer

Legal Events

Date Code Title Description
PUP Patent expired