WO1997025709A3 - Optical disk reader - Google Patents

Optical disk reader Download PDF

Info

Publication number
WO1997025709A3
WO1997025709A3 PCT/US1997/000290 US9700290W WO9725709A3 WO 1997025709 A3 WO1997025709 A3 WO 1997025709A3 US 9700290 W US9700290 W US 9700290W WO 9725709 A3 WO9725709 A3 WO 9725709A3
Authority
WO
WIPO (PCT)
Prior art keywords
pit
data
sampled
location
information storage
Prior art date
Application number
PCT/US1997/000290
Other languages
French (fr)
Other versions
WO1997025709A2 (en
Inventor
Bruce V Johnson
Gregory A Mcdermott
Michael P O'neill
Cezary Pietrzyk
Steven R Spielman
Terrence L Wong
Original Assignee
Calimetrics Inc
Bruce V Johnson
Gregory A Mcdermott
Michael P O'neill
Cezary Pietrzyk
Steven R Spielman
Terrence L Wong
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
Priority claimed from US08/583,651 external-priority patent/US5854779A/en
Application filed by Calimetrics Inc, Bruce V Johnson, Gregory A Mcdermott, Michael P O'neill, Cezary Pietrzyk, Steven R Spielman, Terrence L Wong filed Critical Calimetrics Inc
Priority to AU17458/97A priority Critical patent/AU1745897A/en
Publication of WO1997025709A2 publication Critical patent/WO1997025709A2/en
Publication of WO1997025709A3 publication Critical patent/WO1997025709A3/en

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
    • G11B20/10009—Improvement or modification of read or write signals
    • 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
    • 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
    • G11B20/1496—Digital recording or reproducing using self-clocking codes characterised by the use of more than three levels
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
    • G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • G11B7/0052—Reproducing involving reflectivity, absorption or colour changes

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

The present invention includes a method and apparatus for reading data from an optical information storage disc having an information storage track that includes a plurality of pits, each pit having the capacity to store at least three discrete data levels represented by differing intensities of radiation reflected toward a detector. The information storage track is read and an analog data signal is output which is indicative of the reflectance of the pits. The analog data signal in the vicinity of the location of a pit is sampled and converted to a data signal which is indicative of the reflectance at the location of the sampled pit. The discrete data level stored at the location of the sampled pit level is determined. There is the potential of at least three discrete data levels and each data level corresponds to an associated range of digital signal values. Thus, the data level read from each pit has the capacity to represent more than one bit of information.
PCT/US1997/000290 1996-01-05 1997-01-03 Optical disk reader WO1997025709A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17458/97A AU1745897A (en) 1996-01-05 1997-01-03 Optical disk reader

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/583,651 1996-01-05
US08/583,651 US5854779A (en) 1996-01-05 1996-01-05 Optical disc reader for reading multiple levels of pits on an optical disc
US62019696A 1996-03-22 1996-03-22
US08/620,196 1996-03-22

Publications (2)

Publication Number Publication Date
WO1997025709A2 WO1997025709A2 (en) 1997-07-17
WO1997025709A3 true WO1997025709A3 (en) 1997-09-18

Family

ID=27078867

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/000290 WO1997025709A2 (en) 1996-01-05 1997-01-03 Optical disk reader

Country Status (2)

Country Link
AU (1) AU1745897A (en)
WO (1) WO1997025709A2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003202506B2 (en) * 1997-09-10 2006-07-06 Wea Manufacturing Inc. Dual data recorded compact disc
DE69729895T2 (en) * 1997-09-10 2005-08-25 Wea Mfg. Inc. COMPACT DISC RECORDED WITH TWO-DIMENSIONAL DATA
US7046610B2 (en) 2002-04-24 2006-05-16 Ricoh Company, Ltd. Recording medium suitable for recording/reproducing multi-level data
KR20050029765A (en) * 2003-09-22 2005-03-28 삼성전자주식회사 High density readable only optical disc and method for preparing the same
US7164646B2 (en) * 2004-02-19 2007-01-16 Hewlett-Packard Development Company, L.P. Storage device having a storage cell programmable to one of more than two storage states

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63146224A (en) * 1986-12-10 1988-06-18 Hitachi Ltd Recording/reproducing system
JPH01159832A (en) * 1987-12-16 1989-06-22 Toshiba Corp Optical information recording and reproducing device
JPH03237622A (en) * 1990-02-15 1991-10-23 Canon Inc Optical information recording and reproducing system
JPH04209320A (en) * 1990-11-30 1992-07-30 Toshiba Corp Information reproducing device
US5235587A (en) * 1989-09-29 1993-08-10 The Regents Of The University Of California Optical data storage apparatus and method
US5408456A (en) * 1990-02-02 1995-04-18 Canon Kabushiki Kaisha Data reproducing method and apparatus for determining the interval between pits on a recording medium from a modulated read-out signal
EP0709837A2 (en) * 1994-10-24 1996-05-01 Sony Corporation Optical disks and recording/reproduction thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63146224A (en) * 1986-12-10 1988-06-18 Hitachi Ltd Recording/reproducing system
JPH01159832A (en) * 1987-12-16 1989-06-22 Toshiba Corp Optical information recording and reproducing device
US5235587A (en) * 1989-09-29 1993-08-10 The Regents Of The University Of California Optical data storage apparatus and method
US5408456A (en) * 1990-02-02 1995-04-18 Canon Kabushiki Kaisha Data reproducing method and apparatus for determining the interval between pits on a recording medium from a modulated read-out signal
JPH03237622A (en) * 1990-02-15 1991-10-23 Canon Inc Optical information recording and reproducing system
JPH04209320A (en) * 1990-11-30 1992-07-30 Toshiba Corp Information reproducing device
EP0709837A2 (en) * 1994-10-24 1996-05-01 Sony Corporation Optical disks and recording/reproduction thereof

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 428 (P - 936) 25 September 1989 (1989-09-25) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 024 (P - 1301) 21 January 1992 (1992-01-21) *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 555 (P - 1454) 25 November 1992 (1992-11-25) *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 408 (P - 778) 28 October 1988 (1988-10-28) *

Also Published As

Publication number Publication date
WO1997025709A2 (en) 1997-07-17
AU1745897A (en) 1997-08-01

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