WO2006003537A2 - Appareil de lecture d'un support d'informations - Google Patents

Appareil de lecture d'un support d'informations Download PDF

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Publication number
WO2006003537A2
WO2006003537A2 PCT/IB2005/051945 IB2005051945W WO2006003537A2 WO 2006003537 A2 WO2006003537 A2 WO 2006003537A2 IB 2005051945 W IB2005051945 W IB 2005051945W WO 2006003537 A2 WO2006003537 A2 WO 2006003537A2
Authority
WO
WIPO (PCT)
Prior art keywords
data
information carrier
read
data page
page
Prior art date
Application number
PCT/IB2005/051945
Other languages
English (en)
Other versions
WO2006003537A3 (fr
Inventor
Thomas Jan De Hoog
Robert F. M. Hendriks
Original Assignee
Koninklijke Philips Electronics N.V.
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 N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006003537A2 publication Critical patent/WO2006003537A2/fr
Publication of WO2006003537A3 publication Critical patent/WO2006003537A3/fr

Links

Classifications

    • 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
    • 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0033—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cards or other card-like flat carriers, e.g. flat sheets of optical film
    • 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
    • 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
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
    • G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers

Definitions

  • the invention relates to an apparatus for reading an information carrier.
  • the invention has applications in the field of optical data storage.
  • optical storage solutions are nowadays widespread for content distribution, for example in storage systems based on the DVD (Digital Versatile Disc) standards.
  • Optical storage has a big advantage over hard-disc and solid-state storage in that the information carrier are easy and cheap to replicate.
  • optical storage solutions are not robust to shocks when performing read/write operations, considering the required stability of said moving elements during such operations.
  • optical storage solutions cannot easily and efficiently be used in applications which are subject to shocks, such as in portable devices.
  • Fig.l depicts a three-dimensional view of system illustrating such a new optical storage solution.
  • This system comprises an information carrier 101.
  • the information carrier 101 comprises a set of adjacent elementary data areas having size S and arranged as in a matrix. Data are coded on each elementary data area via the use of a material intended to take different transparency levels, for example two levels in using a material being transparent or non- transparent for coding a 2-states data, or more generally N transparency levels (for example N being an integer power of 2 for coding a log 2 (N)-states data).
  • This system also comprises an optical device 104 (such as a periodic array of apertures or an array of optical fibres) for generating an array of light spots 102 which are intended to be applied to said elementary data areas.
  • Each light spot is intended to be applied to an elementary data area. According to the transparency state of said elementary data areas, the light spot is transmitted (not at all, partially or fully) to a CMOS or CCD detector 103 comprising pixels intended to convert the received light signal, so as to recover the data stores on said elementary data area.
  • a scanning of the information carrier 101 by the array of light spots 102 is done in a plane (x, y) parallel to the information carrier.
  • a scanning device (not shown) provides translational movement in the two directions x and y for scanning all the surface of the information carrier.
  • one pixel of the detector is intended to detect a set of elementary data, said set of elementary data being arranged in a so-called macro-cell data, each elementary data area among this macro-cell data being successively read by a single light spot of said array of light spots 102.
  • This way of reading data on the information carrier 101 is called macro-cell scanning in the following and will be described after.
  • Fig.2 depicts a partial cross-section and detailed view of the information carrier 101, and of the detector 103.
  • the detector 103 comprises pixels referred to as PX1-PX2-PX3, the number of pixels shown being limited for facilitating the understanding.
  • pixel PXl is intended to detect data stored on the macro-cell data MCl of the information carrier
  • pixel PX2 is intended to detect data stored on the macro-cell data MC2
  • pixel PX3 is intended to detect data stored on the macro-cell data MC3.
  • Each macro-cell data comprises a set of elementary data.
  • macro-cell data MCl comprises elementary data referred to as MC Ia-MC Ib- MCl c-MC Id.
  • Fig.3 illustrates by an example the macro-cell scanning of the information carrier 101.
  • Data stored on the information carrier have two states indicated either by a black area (i.e. non-transparent) or white area (Le. transparent).
  • a black area corresponds to a "0" binary state while a white area corresponds to a "1" binary state.
  • the pixel When a pixel of the detector 103 is illuminated by an output light beam generated by the information carrier 101, the pixel is represented by a white area. In that case, the pixel delivers an electric output signal (not represented) having a first state.
  • the pixel is represented by a cross-hatched area. In that case, the pixel delivers an electric output signal (not represented) having a second state.
  • each macro-cell data comprises four elementary data areas, and a single light spot is applied simultaneously to each set of data.
  • the scanning of the information carrier 101 by the array of light spots 102 is performed for example from left to right, with an incremental lateral displacement which equals the pitch of the elementary data areas.
  • the central light spot is applied to a non-transparent area so that the corresponding pixel is in the second state, while the two other light spots are applied to transparent areas so that the two corresponding pixels of the detector are in the first state.
  • Elementary data which compose a macro-cell opposite a pixel of the detector are read successively by a single light spot.
  • the scanning of the information carrier 101 is complete when the light spots have each been applied to all elementary data area of a macro-cell data facing a pixel of the detector. This implies a two-dimensional scanning of the information carrier.
  • Fig.4 represents a top-view of an information carrier 101 as depicted in Fig.l.
  • This information carrier comprises a plurality of square adjacent macro-cells (MCl, MC2, MC3...), each macro-cell comprising a set of elementary data areas (EDAl, ED A2, ).
  • each macro-cell comprises 16 elementary data areas and is intended to be read by a single circular light spot (represented by black circles).
  • the data recovery is done in a massively parallel manner concurrently with the scanning of the array of light spots. For each position of the array of light spots, a set of data called "data page" is read at the same time.
  • a data page is thus constituted by data on which is applied the light spots at a given instant, said data being located at the same position in all macro-cells.
  • the pitch of the light spots must equal the pitch of the macro-cells.
  • This constraint is however very difficult to respect, due for example to manufacturing tolerances and/or media expansion/shrinkage effects, e.g. due to temperature fluctuation.
  • the required alignment between the light spots and the macro-cells can only be achieved over a small portion of the information carrier. This means that in a given data page, only a subset of data can be recovered, the other data of this data page being lost since they do not reflect a correct value.
  • the light signals, at the output of elementary data areas on which are applied the light spots may suffer from crosstalk, i.e. inter-symbol interference, due to the interaction of the light spots with neighbouring data areas.
  • crosstalk i.e. inter-symbol interference
  • the method of recovering data from an information carrier having data stored according to data pages, each data page being formed by a set of data being spatially distant from each other comprises the steps of : reading at least one data page so as to generated at least one read data page, storing said at least one read data page in a storage memory, - recovering data from said at least one read data page stored in said storage memory.
  • This solution allows in a first step to shift the problem caused by optical and mechanical constraints to the digital processing domain, then in a second step to recover data stored on the information carrier by performing dedicated data recovering algorithms. Since the data pages are stored in a memory, such data recovering algorithms can now easily exploit the redundancy and/or correlation between adjacent data.
  • this subset of data pages spatially surround a particular data page for which data must be recovered, which allows to recover data of said particular data page in exploiting the redundancy and/or correlation between the spatially adjacent data stored in this storage memory.
  • the method proposes a step of temporarily storing a read data page, followed by a step of processing said stored data page so as to reduce the bit volume.
  • Fig.l depicts a system for reading an information carrier according to the invention
  • Fig.2 depicts a detailed view of said system
  • Fig.3 illustrates by an example the principle of macro-cell scanning of an information carrier
  • Fig.4 depicts an information carrier intended to be read by a plurality of light spots
  • Fig.5 represents of flow chart of the method according to the invention
  • Fig.6 depicts an embodiment of the method according to the invention
  • Fig.7 illustrates various devices implementing the method according to the invention.
  • a given elementary data will be identify as ED(I 3 J), where I corresponds to the integer line rank in that macro-cell, and J to the integer column rank in that macro-cell.
  • a light spot is thus applied to each elementary data having position (I,J) in the macro-cells.
  • a data page is defined by all elementary data having position (I,J) in the macro-cells.
  • Fig.5 depicts a flow chart of the method according to the invention, of recovering data from an information carrier having data stored according to data pages, each data page being formed by a set of data being spatially distant from each other.
  • This method comprises a step 501 of reading said data pages so as to generate read data pages. If for example an information carrier as depicted in Fig.4 is used, the method preliminary comprises a step of generating an array of light spots intended to be applied to said information carrier, and a step of detecting the level of light signals outputted by said information carrier in response of said light spots.
  • this method also comprises a step 502 of deciding if a bit volume reduction of a read data page is required. Such decision may be given automatically the reading apparatus in which the method is implemented, according to available memory capacity.
  • the method directly goes on to a step 505 of storing the read data page in a storage memory.
  • the read data page is formed by the levels of said light signals generated by the step of detecting.
  • the method comprises a step 503 of temporarily storing a read data page, then a step 504 of processing said stored data page so as to reduce the bit volume of this data page.
  • Such step 504 of processing may consist in performing algorithm which will be detailed in the following.
  • the method comprises the step 505 of storing in said storage memory the read data page having now a reduced bit volume.
  • this method also comprises a step 506 of deciding, if after having read a first data page, another data page must be read on the information carrier and stored on the storage memory.
  • step 501 of reading a data page If another data page must be read (by default), the method goes back to step 501 of reading a data page.
  • the method goes on to a step 507 of recovering data from said read data pages stored in said storage memory.
  • the step 506 of deciding allows to advantageously read and generate only a subset of data pages from said information carrier.
  • said subset of data pages is spatially located around a particular data page containing data to be recovered. For example, to recover data from a given data page, only the subset formed by the 8 neighbouring data pages, as well as this given data page, may be used to recover data.
  • Fig.6 depicts an embodiment of the method according to the invention.
  • This embodiment corresponds to a system for recovering data from an information carrier having data stored according to data pages as depicted in Fig.4, each data page being formed by a set of data being spatially distant from each other.
  • This system comprises a data reading system for reading at least one data page so as to generated at least one read data page.
  • This data reading system may comprises an optical element 604 (such as a periodic array of apertures or an array of optical fibres) for generating an array of light spots 602 intended to be applied to an information carrier 601, and a detector 603 facing said information carrier for detecting the level of light signals outputted by said information carrier in response of said light spots.
  • an optical element 604 such as a periodic array of apertures or an array of optical fibres
  • a detector 603 facing said information carrier for detecting the level of light signals outputted by said information carrier in response of said light spots.
  • the detector for example of the CMOS type, is made of adjacent pixels intended to deliver a binary value coded with a plurality of bits, advantageously 8 bits (i.e. grey levels).
  • the output of the detector 603 is connected to a data bus DB allowing the communication between the different processing means of the system.
  • one pixel of the detector faces a macro-cell.
  • a plurality of pixels may face a macro-cell so that a given elementary data stored being read is over-sampled, facilitating the data recovery since this over-sampling introduces some information redundancy.
  • This system also comprises a storage memory SMEM connected to the data bus DB, for storing said at least one read data page.
  • this system optionally comprises a data compression system DCS for reducing the volume of said at least one read data page intended to be stored in said storage memory SMEM.
  • Said data compression system DCS comprises a second processor CPU2 connected to a second instruction memory MEM2, said second instruction memory MEM2 being intended to store code instructions for performing a data reduction algorithm.
  • the data page which has just been read may be temporarily stored in a buffer BUF connected to the data bus DB.
  • the data compression system DCS can thus apply the data reduction algorithm to the data stored in the buffer BUF.
  • the characteristic of pixels of the CMOS detector to retain temporarily signal levels may advantageously be used, so that the data compression system DCS is directly applied on the data levels available at the detector pixels working as a buffer.
  • the data reduction algorithm may consist in a bit-shifting process applied to data forming the read data page, for example in transforming 8-bit data in 3-bit data.
  • the data reduction algorithm may consist in suppressing the redundancy between spatially adjacent data, for example in combining bit strings of 0 and bit strings of 1.
  • the data reduction algorithm may consist in a downsampling operation performed on the partial (or total) image data of the information carrier.
  • This system also comprises a processing module PM connected to said storage memory SMEM, via the data bus DB, for recovering data from said at least one read data page.
  • Said processing module PM comprises a first processor CPUl connected to a first instruction memory MEMl, said first instruction memory MEMl being intended to store code instructions for performing a data recovery algorithm.
  • the data recovery algorithm may correspond, for example, to the so-celled PRML detection (partial response maximum likelihood detection) by means of the Viterbi algorithm. Since this algorithm is known as such by a skilled person, it will not be described further.
  • the maximum frequency, in the frequency spectrum of adjacent data stored on the information carrier must preferably be half the sampling frequency, at the maximum, where the sampling frequency corresponds in this case to the inverse distance between two elementary data areas.
  • An implementation of this condition may be that the minimum size of the elementary data on the medium is equal to twice the sampling pitch (i.e. twice the distance between the light spots for adjacent data pages).
  • first instruction memory MEMl and the second instruction memory MEM2 may of course correspond to different storage areas of a same instruction memory.
  • the storage memory SMEM and the buffer BUF may of course correspond to different storage areas of a same storage memory.
  • the system and method according to the invention may advantageously be implemented in a reading apparatus RA (e.g. home player apparatus ...), a portable device PD (e.g. portable digital assistant, portable computer, a game player unit%), a mobile telephone MT.
  • a reading apparatus RA e.g. home player apparatus
  • PD portable digital assistant, portable computer, a game player unit
  • a mobile telephone MT Each of these devices comprises an opening (OP) intended to receive an information carrier 701 as depicted in Fig.4, in view of a data recovery.

Landscapes

  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

L'invention concerne un procédé pour récupérer des données d'un support d'informations contenant des données stockées par pages, chaque page de données étant constituée par un jeu de données espacées les unes des autres. Ce procédé consiste à lire (501) au moins une page de données pour générer au moins une page de données lue, à stocker (505) cette page de données lue dans une mémoire, à récupérer (507) des données de ladite page de données lue stockée dans la mémoire. Ledit procédé sert à récupérer des données d'un support de données.
PCT/IB2005/051945 2004-06-28 2005-06-13 Appareil de lecture d'un support d'informations WO2006003537A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04300398 2004-06-28
EP04300398.7 2004-06-28

Publications (2)

Publication Number Publication Date
WO2006003537A2 true WO2006003537A2 (fr) 2006-01-12
WO2006003537A3 WO2006003537A3 (fr) 2008-01-03

Family

ID=35044884

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Application Number Title Priority Date Filing Date
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Country Status (2)

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TW (1) TW200620261A (fr)
WO (1) WO2006003537A2 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860275A (en) * 1986-08-09 1989-08-22 Kyodo Printing Co., Ltd. Optical recording card and method of reading the same
US5490260A (en) * 1990-12-14 1996-02-06 Ceram, Inc. Solid-state RAM data storage for virtual memory computer using fixed-sized swap pages with selective compressed/uncompressed data store according to each data size
EP1050821A2 (fr) * 1999-04-07 2000-11-08 Sony Corporation Unités de mémoire, unités de traitement de données et procédés correspondants
WO2002047074A2 (fr) * 2000-12-07 2002-06-13 Consellation Trid Inc Appareil d'enregistrement et/ou de lecture sur carte transparente optique fluorescente
WO2003007230A2 (fr) * 2001-07-10 2003-01-23 D Data Inc. Systeme a memoire optique pour rechercher des informations sur une carte optique fluorescente multicouche de type rom

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4860275A (en) * 1986-08-09 1989-08-22 Kyodo Printing Co., Ltd. Optical recording card and method of reading the same
US5490260A (en) * 1990-12-14 1996-02-06 Ceram, Inc. Solid-state RAM data storage for virtual memory computer using fixed-sized swap pages with selective compressed/uncompressed data store according to each data size
EP1050821A2 (fr) * 1999-04-07 2000-11-08 Sony Corporation Unités de mémoire, unités de traitement de données et procédés correspondants
WO2002047074A2 (fr) * 2000-12-07 2002-06-13 Consellation Trid Inc Appareil d'enregistrement et/ou de lecture sur carte transparente optique fluorescente
WO2003007230A2 (fr) * 2001-07-10 2003-01-23 D Data Inc. Systeme a memoire optique pour rechercher des informations sur une carte optique fluorescente multicouche de type rom

Also Published As

Publication number Publication date
TW200620261A (en) 2006-06-16
WO2006003537A3 (fr) 2008-01-03

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