DK166055C - A PROCEDURE AND A CIRCUIT FOR AUTOMATIC CORRECTION OF THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER. - Google Patents

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

Info

Publication number
DK166055C
DK166055C DK614386A DK614386A DK166055C DK 166055 C DK166055 C DK 166055C DK 614386 A DK614386 A DK 614386A DK 614386 A DK614386 A DK 614386A DK 166055 C DK166055 C DK 166055C
Authority
DK
Denmark
Prior art keywords
circuit
fact
scanning
anomalies
servo
Prior art date
Application number
DK614386A
Other languages
Danish (da)
Other versions
DK614386D0 (en
DK166055B (en
DK614386A (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 DK614386D0 publication Critical patent/DK614386D0/en
Publication of DK614386A publication Critical patent/DK614386A/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

An automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support, with a known servo-circuit, for detecting anomalies in the scanning system (1) to whose outputs is connected a gate circuit, providing as necessary a mute control signal at the decoder (2) connected to the scanning system (1) and thus ensuring the mute control of its outputs. According to the invention, anomalies in scanning caused by external faults and/or disc faults, such as scratches, can largely be reduced, in terms of the disturbance caused by this phenomenon, by 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 the fact that a comparator (6) compares any newly read data with the preceding information, which is temporarily stored in a latch circuit (7) and by the fact that a preliminary indication is made available, in the form of a measurement window $g(D) 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 the fact that the scanning system (1) refers back to the last valid scanning point.
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
DK614386D0 DK614386D0 (en) 1986-12-18
DK614386A DK614386A (en) 1986-12-18
DK166055B DK166055B (en) 1993-03-01
DK166055C true 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
US20050174275A1 (en) * 2002-05-21 2005-08-11 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
EP0221936A1 (en) 1987-05-20
EP0221936B1 (en) 1990-10-24
DK614386D0 (en) 1986-12-18
WO1986006200A1 (en) 1986-10-23
DK166055B (en) 1993-03-01
ATE57785T1 (en) 1990-11-15
DE3675150D1 (en) 1990-11-29
KR970006831B1 (en) 1997-04-30
DE3514035A1 (en) 1986-10-23
JPH0785344B2 (en) 1995-09-13
HK176795A (en) 1995-11-24
KR880700408A (en) 1988-03-15
JPS62502003A (en) 1987-08-06
DK614386A (en) 1986-12-18

Similar Documents

Publication Publication Date Title
JPS5774837A (en) Signal detection system of optical information reproducing device
DK449182A (en) DEVICE FOR THE VALIDITY OF MONTHS
DE3370393D1 (en) Disc playback apparatus
JPS6467776A (en) Disk device
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
CA2029719A1 (en) Optical disc reproducing apparatus
GB1460827A (en) System for testing a data processing unit
DK166055C (en) A PROCEDURE AND A CIRCUIT FOR AUTOMATIC CORRECTION OF THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER.
EP0397354A3 (en) Device for detecting cross talk level of optically read signal
ATE157796T1 (en) OPTICAL SCANNING DEVICE
KR920009194B1 (en) Apparatus for producing digital information via a transmission medium
JPH0464924A (en) Defect detecting circuit for optical pickup device
DK490184A (en) DEVICE FOR RENDERING INFORMATION FROM AN OPTICALLY RELEASED REGISTRAR
DK614286A (en) AUTOMATIC CORRECTION SYSTEM FOR THE SERVICE CIRCUIT IN A DEVICE WITH OPTICAL DETECTION OF A ROTATING INFORMATION CARRIER
DE59008679D1 (en) DETECTION CIRCUIT.
MY123401A (en) Apparatus for reading from or writing to optical recording media
JP2774516B2 (en) Disk defect detection circuit
KR940004391Y1 (en) Teletext data detecting circuit
KR980004736A (en) Error Detection Device in Optical Disc Playback System
SU1173444A2 (en) Device for error correction in digital magnetic storage
SU1709361A2 (en) Device for reading data from oscilloscope screen
SU930220A2 (en) Device for measuring magnetic medium start time
JPS5486313A (en) Error detecting system
MY122099A (en) Data slice circuit and data slice method
JPS57142094A (en) Optical information recorder and reproducer

Legal Events

Date Code Title Description
PUP Patent expired