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WO2008012718A2 - Lecteur de disque optique avec reconnaissance de disque - Google Patents

Lecteur de disque optique avec reconnaissance de disque Download PDF

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Publication number
WO2008012718A2
WO2008012718A2 PCT/IB2007/052738 IB2007052738W WO2008012718A2 WO 2008012718 A2 WO2008012718 A2 WO 2008012718A2 IB 2007052738 W IB2007052738 W IB 2007052738W WO 2008012718 A2 WO2008012718 A2 WO 2008012718A2
Authority
WO
WIPO (PCT)
Prior art keywords
optical disc
identification data
data
label side
optical
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.)
Ceased
Application number
PCT/IB2007/052738
Other languages
English (en)
Other versions
WO2008012718A3 (fr
Inventor
Alexander Padiy
Coen A. Verschuren
Evgeny Verbitskiy
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2008012718A2 publication Critical patent/WO2008012718A2/fr
Publication of WO2008012718A3 publication Critical patent/WO2008012718A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
    • G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
    • 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
    • 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
    • G11B27/24—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
    • 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
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1291—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting serves a specific purpose
    • G11B2020/1294—Increase of the access speed
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • 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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information

Definitions

  • the present invention relates to an optical disc drive and a method for operating an optical disc having a data side and a label side.
  • optical disc drives take a rather long start-up time, i.e. time interval between the moment of insertion of an optical disc in the optical disc drive and the moment when the disc can be accessed. Because of strong user dissatisfaction with long start-up times, typically around a few seconds, optical disc drive start-up time has become an important differentiator for the drive manufacturers. Long start-up time is related to a large number of different types of optical discs which may be inserted in the optical disc drive: CD-ROM, CD- Audio, CD-R, CD-RW, DVD-ROM, DVD-Video, DVD-Audio, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD+R9, DVD-R9.
  • optical disc drive is forced to check all the different options before focusing and radial tracking can be done, and positioning of the optical pick-up unit can be performed.
  • Triple Writer CD, DVD and Blu-ray Disc
  • Known methods use a complex set of reflectivity measurements using the different laser sources in the optical disc drive.
  • US 2002/0003757 Al discloses an apparatus for reading from and/or writing to an optical recording medium, in particular a DVD-ROM disc.
  • the apparatus uses identification features, such as the BCA code (burst cutting area code) that is individually located for the recording medium in the BCA data area on the data side of the recording medium, the list of contents or a print-on label (e.g. a bar coding), as identification information to identify the recording medium.
  • BCA code burst cutting area code
  • a print-on label e.g. a bar coding
  • the customary adjustment procedure must be carried out in order to set the parameters and to prepare the apparatus for reliable reading from and/or writing to the optical recording medium.
  • an optical disc drive as claimed in claim 1.
  • the optical disc drive uses the (visual) appearance of the label side, i.e. the non-data side, of the optical disc for identifying said optical disc and its operation parameters.
  • different optical discs have different labels which are for example printed on said optical disc by the optical disc manufacturer or written on said optical disc with a marker, e.g. in case of re-writable or write-once optical discs.
  • the optical disc drive Every time the optical disc is inserted, the optical disc drive measures the reflectivity from a portion of the surface of the label side of the optical disc, determines identification data from the obtained label side reflectivity signal and compares the identification data with a database storing predetermined identification data of optical discs (mainly of those which have been put into the drive before). If one of the database identification data, to which operation data are assigned, matches the identification data of the inserted disc sufficiently well, the optical disc drive starts from the settings included in the operation data stored in the database for the well-matching optical disc. Thus, the start-up time during optical disc insertion processes is significantly decreased, since users have usually a rather fixed collection of optical discs they regularly play.
  • the optical disc drive according to the present invention is capable of identifying an optical disc independently of a particular identification information such as the BCA code, which is not always present.
  • the object is achieved by a corresponding method for operating an optical disc as claimed in claim 9 and by a computer program as claimed in claim 10.
  • a computer program can be a complete software program containing all the program code for implementing the mentioned method steps in software, but can also be a short script containing only a short link or function calling such a complete software program or making use thereof.
  • Preferred embodiments of the invention are defined in the dependent claims.
  • a preferred embodiment refers to additionally using the data side reflectivity signal of the data side of the optical disc which is measured by a data side reflectivity measuring unit comprised in the optical disc drive at the beginning of the regular start-up procedure in order to identify the optical disc inserted in the optical disc drive.
  • This data side reflectivity signal is employed in combination with the label appearance of the optical disc for increasing the sensitivity and specificity of the optical disc recognition algorithm.
  • a further preferred embodiment refers to the case if none of the predetermined identification data matches the identification data of the inserted optical disc sufficiently well. In such a case the conventional start-up procedure is employed and/or another label side reflectivity signal of another portion of said label side is measured.
  • the optical disc drive adds a new record into the database memory storing predetermined identification data if the optical disc inserted to said optical disc drive is new.
  • the new record includes the identification data of the inserted optical disc and the operation data assigned to the identification data of said optical disc as predetermined identification data.
  • a further preferred embodiment refers to adapting the predetermined identification data matching the identification data of the inserted optical disc to the identification data of the inserted optical disc in order to reflect recent slight changes to the optical disc visual appearance like scratches etc.
  • a preferred embodiment refers to measuring the label side reflectivity signal and/or the data side reflectivity signal as a function of wavelength.
  • the label side reflectivity measuring unit preferably comprises a light-emitting diode and a photodetector
  • the data side reflectivity measuring unit preferably is the optical reading unit already available in the drive for reading data from said data side of said optical disc.
  • the comparison unit is adapted for applying a circular convolution to the identification data and to the predetermined identification data and/or for using a Gabor representation of said label side reflectivity signal and/or of said data side reflectivity signal.
  • a preferred embodiment refers to an optical disc drive comprising a memory storing the predetermined identification data of a plurality of optical discs.
  • the optical disc drive is coupled to a memory, in particular a local memory of a device comprising said optical disc drive and/or a remote database, storing said predetermined identification data of a plurality of optical discs.
  • a database memory may be updated with known discs via an internet download or a firmware update. The optical disc manufacturers may thus provide a link relating to the optical disc visual appearance and the optical disc/data characteristics in this preferred embodiment.
  • Compact Disc Database data are assigned to said predetermined identification data.
  • additional useful information is provided to the user inserting an optical disc into the optical disc drive.
  • Fig. 1 shows an optical disc having a data side and a label side
  • Fig. 2 shows an optical disc drive according to the invention
  • Fig. 3 shows a schematic of the reflectivity measurement set-up for measuring the reflectivity signal of the label side of the optical disc
  • Fig. 4 shows two photos of optical discs of different disc types having similar labels
  • Fig. 5 shows the scanned reflectivity signal for the two optical discs of Fig. 4;
  • Fig. 6 shows a similarity diagram for a small database storing predetermined identification information.
  • a conventional optical disc 10 is illustrated in Fig. 1.
  • An optical disc usually has a data side 14 (here the bottom side) and a label side 13 (here the top side).
  • the data side 14 may be provided with identification information such as a BCA code for identifying a particular optical disc 10.
  • BCA code for identifying a particular optical disc 10.
  • not every optical disc 10 is provided with a BCA code which is usually generated by the optical disc manufacturer.
  • optical discs 10 The popularity of re-writable and or write-once optical discs 10 is increasing as users like to compose their own optical discs 10 comprising a personal collection of data, such as music, video, picture, program data.
  • the users mark these optical discs 10 usually with a label 12, i.e. a printed-on label, a LightScribe label, a pencil- written label, a sticker etc., for identifying the content of the optical disc 10.
  • a label 12 is provided on the label side 13 of the optical disc 10, i.e. on the non-data side, as any label on the data side 14 would interfere the process of reading data from the data side 14.
  • An optical disc drive 20 according to the present invention is illustrated in
  • the optical disc drive 20 comprises an optical read unit 22 for reading data from an optical disc 10. It further comprises a rotation unit 28 for rotating the optical disc 10 during operation in order to read out the data stored in spiral tracks of the data side 14 of the optical disc 10.
  • the optical disc drive 20 further comprises a label side reflectivity measuring unit 21 for measuring a label side reflectivity signal of at least a portion 15 of said label side 13.
  • the portion 15 is, for example, a circular portion (e.g. a ring) at a certain radius or at a number of different radii of the optical disc 10.
  • the label side reflectivity measuring unit 21 comprises a light source 31 and a detector 32. As shown in Fig.
  • the label side reflectivity measuring unit 21 is, for instance, a low-cost LED-photodetector combination for measuring the reflectivity of the label side 13, possibly as a function of LED wavelength since multi-color LEDs are quite common and cost almost as little as single-color LEDs.
  • the color information may possibly include the invisible part of the spectrum, depending on the available types of LEDs.
  • the optical properties of the optical disc 10 are measured such as reflectivity of the label side 13.
  • the reflectivity of the data side 14 is measured by using a data side reflectivity measuring unit 22 for measuring a data side reflectivity signal of at least a portion 15 of said data side 13.
  • the optical read unit 22 of the optical disc drive 20 is preferably used as a data side reflectivity measuring unit 22.
  • the reflectivity level is conventionally determined by the optical read unit 22 during start-up of the optical disc 10 when inserted in the optical disc drive 20. This benefit for identifying the inserted optical disc 10 is achieved by using the label side reflectivity signal and the data side reflectivity.
  • the optical disc drive 20 further comprises an identification data determining unit 23 for determining identification data for identifying said optical disc 10 on the basis of said label side reflectivity signal.
  • the identification data determining unit 23 uses the signal received from the label side reflectivity measuring unit 21 to generate identification data which are unique for the particular optical disc 10 inserted to the optical disc drive 20. Such identification data can, for instance, be a significant portion of the measured reflectivity signal.
  • a comparison unit 24 and an internal memory 25 are comprised in the optical disc drive 20.
  • the comparison unit 24 compares said identification data with predetermined identification data of a plurality of optical discs 10 for identifying said plurality of optical discs 10. The operation of the comparison unit 24 will be described below in detail with respect to Fig. 6.
  • the internal memory 25 stores predetermined identification data of a plurality of optical discs 10. Operation data for operating said plurality of optical discs 10 are assigned to said predetermined identification data. These operation data include for example different options before focusing and radial tracking can be done and positioning of the optical read unit 22 can be performed. The operation data may be a code indicative of the disc type.
  • the optical disc drive 20 according to the invention is - in addition or alternatively to the internal memory 25 - coupled to an external memory 26 storing predetermined identification data of a plurality of optical discs 10.
  • the external memory 26 is either a local memory of an device the optical disc drive 20 is embedded into or a remote database, such as Compact Disc Database (CDDB), in which "fingerprints" of the optical disc 10 are stored.
  • CDDB Compact Disc Database
  • a "fingerprint” is (a compact version of) identification data from label side only or both from label side and data side, i.e. it is reduced information in a compacted version of a complete scan as described below (discrete Fourier transform, Gabor etc.).
  • CDDB is a database for software applications to look up optical disc 10 information over the Internet. This is performed by a client which calculates unique optical disc identification data and then queries the external memory 26. As a result, the client is able to display the artist name, optical disc title, track list and some additional information. Thus, the label 12 is used as a tool for improving the quality of CDDB searches.
  • the table stored in internal memory 25 and/or external memory 26 of "known" optical discs 10 is updated via an internet download or firmware update. For achieving this the disc manufacturers provide a link relating to the optical disc visual appearance and the optical disc/data characteristics.
  • the optical disc drive 20 further comprises a control unit 27 for controlling the operation of said optical disc 10 in accordance with operation data assigned to the predetermined identification data which match said identification data of said optical disc 10. That is, if identification data of the inserted optical disc 10 matches predetermined identification data stored in internal memory 25 and/or external memory 26, this optical disc 10 is "known" to the optical disc drive 20. In such a case the control unit 27 loads the operation data assigned to this predetermined identification data for operating the inserted optical disc 10, which will then be used for the start-up procedure.
  • the conventional time-consuming start-up procedure is significantly shortened in time.
  • this optical disc 10 If identification data of the inserted optical disc 10 does not match predetermined identification data stored in memory 25 and/or 26 this optical disc 10 is not "known" to the optical disc drive 20. Then, the control unit 27 applies the conventional start- up procedure for determining the operation data of the inserted optical disc 10, operates it in accordance with these operation data and preferably stores the just determined operation data together with identification data (which are additionally determined for their optical disc) in the internal memory 25 and/or external memory 26. Thus, the next time when this optical disc 10 is inserted, the optical disc drive 20 recognizes this optical disc 10 as "known” on basis of the stored identification data and the control unit 27 operates it in accordance with the operation data assigned to the stored identification data.
  • the set-up shown in Fig. 3 consists of a stable light source 31 illuminating a small portion 15 on the label side 13 of the optical disc 10, in this example a mercury discharge lamp in combination with a monochromator and a set of selectable filters, and a calibrated photodetector 32 to measure the amount of reflected light.
  • the optical disc 10 is mounted on a rotation stage of the rotation unit 28. Because of the availability of inexpensive LED sources in this range, a wavelength of 650 nm is, for instance, chosen.
  • the light beam is parallel, i.e. not focused, with a cross section in the order of 1 mm 2 , and the optical disc radius is 45 mm.
  • FIG. 5 illustrates examples of measured reflectivity scans for two labels 12 of the optical discs 41, 42 shown in Fig. 4.
  • the optical discs 41, 42 are provided with similar labels 12 but are different optical disc types of the same manufacturer.
  • Optical disc 41 is a DVD+RW disc
  • optical disc 42 is a DVD+R disc.
  • the reflectivity scans according to Fig. 5 are obtained during a single optical disc rotation at a fixed radius, in this case at 45 mm.
  • the optical disc drive 20 evaluates the reflectivity scan to decide whether this reflectivity scan - and hence the optical disc 10 - has been inserted in the optical disc drive 20 before.
  • the start-up procedure starts with the parameters of the operation data corresponding to the characteristics of the matching optical disc 10 from the database memory 25, 26.
  • Circular convolution between X 1 and Y can serve as the basis for similarity measure. Circular convolution is defined as follows:
  • the X- axis of fig. 6 indicates the maximal similarity between the scan of an optical disc and the previous scans of the same optical disc present in the database.
  • the Y-axis is the maximal similarity between the scan of an optical disc and the scans of other optical discs present in the database. All points below the diagonal in Fig. 6 correspond to a correct identification, all points above the diagonal correspond to a wrong identification. Using this experimental database, the identification procedure described above reaches 97% accuracy of identification.
  • This fingerprint should be, on one hand, relatively short and easy to compute, and on the other hand, the fingerprint should be robust against the measurement noise and contain enough information to discriminate between a relatively large number of discs.
  • DFT Digital Convolution Theorem
  • a further embodiment refers to an inexpensive LED 31 with a simple photodetector circuit 32 to supply the reflectivity values.
  • Such a solution can be made very compact, which is advantageous especially for low building height optical disc drives 20 such as the range of 'slim-line' or portable products.
  • care is to be taken to maintain the sensitivity of this set-up. For example, a drop in LED output could result in failure to recognize an optical disc if it is not corrected for.
  • a simple solution is to do a calibration measurement against a fixed reference surface in the optical disc drive 20, e.g. every time just before an optical disc 10 is loaded.
  • the signal-to-noise ratio of such a simple set-up will be lower and that the illuminated area on the optical disc 10 can be larger, in the order of a few mm 2 (reduced resolution).
  • the comparing algorithm is to be sufficiently robust to cope with this. If needed, the reflectivity scanning resolution is simply improved by adding a slit (long side along radial direction) between the LED 31 and the optical disc 10, without losing a lot of light/signal (as for case of pin-hole).
  • the invention can be summarized as follows. As it is known, a considerable amount of time is spent in establishing the disc type during a start-up time, when the optical disc is inserted in the drive. In order to shorten such start-up time, when the optical disc 10 is "known" to the optical disc drive 20, i.e. when the optical disc has been already inserted in the optical disc drive before, according to the invention the optical disc drive inspects the label side of the optical disc so as to derive identification data and subsequently compares said identification data with a plurality of identification data of discs previously dealt with. If a match is found, the disc type is immediately known.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
  • a suitable medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

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

Abstract

La présente invention concerne un lecteur de disque optique (20) et un procédé pour faire fonctionner un disque optique (10) ayant un côté données (14) et un côté étiquette (13). Comme on le sait, une quantité de temps considérable est gaspillée à établir le type de disque pendant la phase de démarrage, quand le disque optique est inséré dans le lecteur. Pour raccourcir cette phase de démarrage, quand le lecteur de disque optique (20) 'reconnaît' le disque optique, c'est-à-dire quand le disque optique (10) a été déjà inséré dans le lecteur de disque optique (20) auparavant, selon l'invention le lecteur de disque optique inspecte le côté étiquette du disque afin d'extraire des données d'identification et de comparer ensuite lesdites données d'identification avec une pluralité de données d'identification de disques précédemment traités. Si une correspondance est établie, le type de disque est immédiatement reconnu.
PCT/IB2007/052738 2006-07-28 2007-07-10 Lecteur de disque optique avec reconnaissance de disque Ceased WO2008012718A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP06118031.1 2006-07-28
EP06118031 2006-07-28

Publications (2)

Publication Number Publication Date
WO2008012718A2 true WO2008012718A2 (fr) 2008-01-31
WO2008012718A3 WO2008012718A3 (fr) 2008-05-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/052738 Ceased WO2008012718A2 (fr) 2006-07-28 2007-07-10 Lecteur de disque optique avec reconnaissance de disque

Country Status (2)

Country Link
TW (1) TW200830282A (fr)
WO (1) WO2008012718A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2110815A2 (fr) 2008-04-18 2009-10-21 Hitachi Ltd. Appareil pour disque optique et méthode d'identification de disque
CN112863553A (zh) * 2019-11-12 2021-05-28 光宝电子(广州)有限公司 运用于光盘柜中的光盘机启动控制方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10106128A (ja) * 1996-09-26 1998-04-24 Mitsumi Electric Co Ltd ディスク装置
JP3956756B2 (ja) * 2001-10-31 2007-08-08 ヤマハ株式会社 光ディスク記録装置
US7394738B2 (en) * 2002-03-20 2008-07-01 Hewlett-Packard Development Company, L.P. Identifying optical disc properties from information read from label side of optical disc
KR20040068697A (ko) * 2003-01-27 2004-08-02 엘지전자 주식회사 최적 기록 파워 설정 방법 및 광 디스크 기록 재생 장치
US20050147019A1 (en) * 2004-01-06 2005-07-07 Creel Kenneth R. Media control features for a compact disc
US7701479B2 (en) * 2004-12-17 2010-04-20 Hewlett-Packard Development Company, L.P. System and method for laser write power calibration

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2110815A2 (fr) 2008-04-18 2009-10-21 Hitachi Ltd. Appareil pour disque optique et méthode d'identification de disque
EP2110815A3 (fr) * 2008-04-18 2010-01-13 Hitachi Ltd. Appareil pour disque optique et méthode d'identification de disque
US8077573B2 (en) 2008-04-18 2011-12-13 Hitachi, Ltd. Optical disk apparatus and disk identification method
CN101562031B (zh) * 2008-04-18 2013-07-17 株式会社日立制作所 光盘装置和盘判别方法
CN112863553A (zh) * 2019-11-12 2021-05-28 光宝电子(广州)有限公司 运用于光盘柜中的光盘机启动控制方法

Also Published As

Publication number Publication date
WO2008012718A3 (fr) 2008-05-29
TW200830282A (en) 2008-07-16

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