WO2006136986A2 - Dispositif et procede pour integrer un signal d'informations secondaire au flux de donnees de canal d'un signal d'informations primaire, au moyen d'un embrouillage - Google Patents

Dispositif et procede pour integrer un signal d'informations secondaire au flux de donnees de canal d'un signal d'informations primaire, au moyen d'un embrouillage Download PDF

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Publication number
WO2006136986A2
WO2006136986A2 PCT/IB2006/051923 IB2006051923W WO2006136986A2 WO 2006136986 A2 WO2006136986 A2 WO 2006136986A2 IB 2006051923 W IB2006051923 W IB 2006051923W WO 2006136986 A2 WO2006136986 A2 WO 2006136986A2
Authority
WO
WIPO (PCT)
Prior art keywords
scrambling
information signal
bits
data stream
scrambled
Prior art date
Application number
PCT/IB2006/051923
Other languages
English (en)
Other versions
WO2006136986A3 (fr
Inventor
Peter Bentvelsen
Jo Frisson
Engelbertus P. G. M. Kramer
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 WO2006136986A2 publication Critical patent/WO2006136986A2/fr
Publication of WO2006136986A3 publication Critical patent/WO2006136986A3/fr

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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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
    • G11B20/00557—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas
    • 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
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00579—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the data encoding, e.g., modulation schemes violating run-length constraints, causing excessive DC content, or involving uncommon codewords or sync patterns
    • 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
    • G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
    • G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
    • 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
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1288—Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
    • 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
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs

Definitions

  • the present invention relates to a device and a method for embedding a secondary information signal in the channel data stream of a primary information signal to obtain a modulation stream. Further, the present invention relates to a device and a method for extracting from a modulation stream a secondary information signal embedded in scrambled form in the channel data stream of a primary information signal. Still further, the present invention relates to a record carrier and a signal carrying a modulation stream storing a secondary information signal embedded in scrambled form in the channel data stream of a primary information signal. Finally, the present invention relates to a computer program for implementing said methods on a computer.
  • WO 02/15185 Al discloses how to encode and decode a secondary signal in a RLL code.
  • the secondary signal is stored in the absolute polarity at a predetermined position in the NRZI channel bit stream; this polarity is set using a degree of freedom existing in the operation of the DC-control means (for CD: merging bits; for DVD: primary/secondary syncs, main/substitution table, state flip; for BD: DC-control bits).
  • a secondary channel bit with value zero is encoded as polarity low (low reflectance, as pit or written mark), while a secondary channel bit with value one is encoded as polarity high (high reflectance, as land between pits or written marks).
  • the accumulated digital sum value (DSV) shall be minimized to keep the low frequency content of the modulated signal as small as possible. If at a predetermined position a degree of freedom in the DC-control is used to encode a secondary channel bit instead of minimization of the DSV, the low frequency content will generally increase.
  • the secondary channel bits as described above are encoded into polarity settings, in particular at regular intervals in the bit stream, then in the case that the secondary channel data has a constant value or is a repetitive or otherwise regular pattern, the power spectrum will have spikes at the repetition frequencies of the secondary channel bit positions. Such spikes are undesired since they might disturb, for instance, the servo control.
  • an embedding device as claimed in claim 1 comprising: a scrambling unit for scrambling the secondary channel bits of said secondary information signal according to a scrambling rule, and a setting unit for setting the polarity of said channel data stream at predetermined positions based on the binary value of the scrambled secondary channel bits
  • an extracting device as claimed in claim 13 comprising: a detection unit for detecting the polarity of said modulation stream at predetermined positions to obtain scrambled secondary channel bits of said secondary information signal, and - a descrambling unit for descrambling said scrambled secondary channel bits according to a descrambling rule corresponding to a scrambling rule used for scrambling the secondary channel bits to obtain said scrambled secondary channel bits during embedding of said secondary information signal in the channel data stream of said primary information signal.
  • the present invention is based on the idea, to generally use the known concept for embedding the secondary information signal into the channel data stream of the primary information signal, but to scramble the secondary channel bits beforehand in order to minimize unwanted frequency components in the signal spectrum.
  • the polarity setting at the secondary channel bit location is randomized. In this way it is avoided that regular modulation patterns are formed so that unwanted frequency peaks in the power spectrum of the modulation signal are efficiently avoided according to the present invention.
  • a preferred embodiment of the invention is proposed to use scrambling bits for scrambling the secondary channel bits derived from channel bits of the channel data stream of the primary information signal.
  • This has the advantage that the device for extracting the secondary information signal from a modulation stream can easily descramble the scrambled secondary channel bits since it will also be provided with the channel bits of the channel data stream of the primary information signal enabling it to reconstruct the scrambling bits.
  • no additional information needs to be transmitted from an encoder to a decoder, but just the way in which such scrambling bits are formed has to be known to both, the encoder and the decoder, i.e. the decoder has to use a descrambling rule that corresponds and is complementary to the scrambling rule during by the encoder.
  • These rules are preferably predetermined and reconstructable.
  • Such scrambling bits are derived from address information bits of the channel data stream.
  • address information bits can, for instance, be the physical sector number.
  • any kind of scrambling can be applied for the purpose of the invention as long as both the device for embedding and the device for extracting know the particular scrambling/descrambling rule so that both apply the same scrambling/descrambling scheme.
  • a shift register in particular a linear feedback shift register, is used for this purpose as it is generally known and used for a scrambling of the main channel data bits in BD.
  • Such a shift register can be easily implemented and requires only a limited number of calculations.
  • Said shift register is preferably loaded with an initial information from which an initial scrambling word is taken for scrambling a first secondary information word, a word meaning preferably one byte of 8 bits. Subsequently, one or more predetermined shifts are performed to obtain further scrambling words for scrambling further secondary information words.
  • all secondary information words to be embedded in one ECC cluster of the channel data stream are scrambled using the scrambling words which are obtained starting from the same initial information loaded into this shift register.
  • a new start is made by loading a new information into the shift register leading to the advantages described above when using address information for deriving the scrambling bits.
  • the initial information is a number of predetermined address information bits of the physical sector number of an ECC cluster into which said scrambled secondary channel bits shall be embedded for deriving said scrambling bits.
  • the scrambling rule determines which bits of the physical sector number are to be loaded into the shift register and how the shift register shall be shifted.
  • contents of the shift register can also be subjected to another operation, for instance one or more predetermined logic operations for forming said scrambling bits.
  • the polarity of the channel data stream is preferably set in the frame sync, in particular in a long run length in the frame sync, preferably in the first long run length thereof.
  • one secondary channel bit can be embedded in each frame sync.
  • one or more DC-control bits are set in front of the predetermined position to control the polarity of the subsequent frame sync.
  • other possibilities exist, in particular for other optical storage systems than BD.
  • Fig. 1 shows different DSV power spectra illustrating the effect of the invention
  • Fig. 2 illustrates how a polarity can be set in a modulation stream
  • Fig. 3 shows polarity control using DC-control bits
  • Fig. 4 shows the data format of one ECC cluster of secondary channel bits
  • Fig. 5 shows an embodiment of a scrambling circuit according to the present invention
  • Fig. 6 shows a block diagram of an encoder according to the present invention
  • Fig. 7 shows a block diagram of a decoder according to the present invention.
  • Fig. 1 the low frequency part of the power spectrum is shown for three modulation streams in DVD.
  • Spectrum A is from a normal DVD modulation stream that is encoded using the DC-control strategy as described in annex J.I of the DVD Specification for Read-only disc, part 1 Physical Specifications.
  • Spectrum B shows an example of a DVD modulation stream that contains one secondary channel bit in each main channel sync frame (encoded as described in WO 02/15185 Al), where the secondary channel bits consist of a regular data pattern.
  • Spectrum C shows an example of a DVD modulation stream that contains one secondary channel bit in each main channel sync frame (encoded as described in WO 02/15185 Al), but where the secondary channel bits are essentially random as proposed according to the present invention. It will be explained in detail in the following how this can be obtained based on an example for BD rewritable format.
  • a secondary channel bit (obtained from the secondary information signal by secondary channel preprocessing, such as adding of CRC and/or ECC bits), is stored in the first 9T runlength of a recording frame sync.
  • An ECC cluster in BD contains 496 frame syncs of which all or a limited number can be used for storing the secondary channel bits.
  • the 17PP modulation stream in BD can result in two signal polarities in the NRZI modulation stream as shown in Fig. 2.
  • the correspondence between the secondary channel bit value and the modulation signal polarity can be defined as follows.
  • the secondary channel bit is '0' if the polarity of the modulation signal is low, corresponding to a written mark on the disc.
  • the secondary channel bit is '1' if the polarity of the modulation signal is high, corresponding to a land between written marks on the disc.
  • the definition can also be made vice versa.
  • DC-control bits inserted in the data bit stream are used to minimize the accumulated DSV of the modulation bit stream. If a DC-control bit is set to ' 1 ', the polarity of the recorded signal is inverted.
  • the polarity of the sync of recording frame N+l is controlled by setting one or more DC- control bits of recording frame N to such a value that the secondary channel bit in the sync of the next recording frame has the desired polarity as shown in Fig. 3.
  • the polarity can be controlled by setting the DC-control bits are described in European patent application EP 04105194 (PHNL 041167) to which reference is herewith made.
  • the secondary channel bits are organized, for instance, as 400 secondary information bits, 16 bits CRC and 80 bits of ECC protecting the secondary information bits and the CRC, in total 496 bits.
  • the most significant bit is written first.
  • CRC Cyclic Redundancy Check
  • the 18 bytes A 27 to A 10 containing the secondary information bits and inverted CRC are now scrambled.
  • the output of the scrambling circuit shown in Fig. 5 is used for this purpose, in which bits S 7 (msb) to S 0 (lsb) represent a scrambling byte at each 8-bit shift.
  • LFSR Linear Feedback Shift Register
  • the shift register is, according to this preferred embodiment, preset with a value derived from the first (virtual) Physical Sector Number (PSN) of the ECC cluster where the secondary channel bits frames are located.
  • PSN Physical Sector Number
  • S 7 ...S 0 are taken out as scrambling byte S 27 .
  • an 8-bit shift is repeated 17 times and the following 17 bytes are taken from s 7 ... S 0 as the scrambling bytes S 26 to S 10 .
  • the scrambled channel bytes are preferably extended with error correction information.
  • the secondary channel user data and CRC can optionally be protected by an Error Correction Code, e.g. a Reed-Solomon code, in this example a [62, 52, 11]-RS code.
  • an Error Correction Code e.g. a Reed-Solomon code, in this example a [62, 52, 11]-RS code.
  • a Reed-Solomon code in this example a [62, 52, 11]-RS code.
  • Fig. 6 shows a simple block diagram of an encoder according to the present invention. It comprises a first preprocessing unit 10 for channel preprocessing of the primary channel user data P, for instance for adding a CRC, interleaving and/or error correction. Further, it comprises a second preprocessing unit 11 for channel preprocessing of the secondary channel user data S. Said preprocessing comprises, more or less, the same or similar steps as the preprocessing of the primary channel user data P performed in the first preprocessing unit 10. However, as proposed according to the present invention, said second preprocessing unit 11 is further adapted for a scrambling of the secondary channel user data as described above. For this purpose the physical sector number PSN of the current ECC cluster into which one secondary channel information bit shall be embedded is provided as input to the second preprocessing unit 11 from the output of the first preprocessing unit 10.
  • the encoder shown in Fig. 6 further comprises a modulation encoding and embedding unit 12 for modulation encoding of the primary channel bit stream 1 outputted from the first preprocessing unit 10 and for embedding therein the preprocessed and scrambled secondary channel bit stream C2 outputted from the second preprocessing unit 11.
  • This embedding is done, according to this preferred embodiment for BD, by setting the polarity in one, e.g. the first, of the long run lengths of the frame sync such that the polarity at this location of the modulation bit stream M represents the bit value of the secondary channel bit stream C2 to be embedded at this location (see Fig. 2).
  • This polarity setting can be done by setting one or more DC control bits of the previous recording frame to appropriate values which is possible due to the degree of freedom available in the DC control.
  • the finally outputted modulation bit stream M can be stored on a record carrier or transmitted as a signal, for instance via a transmission line. Due to this scrambling of the secondary channel user data S it is achieved that the spectrum of the modulation bit stream M does not show undesired spikes which could disturb the servo control.
  • a block diagram of an embodiment of a decoder according to the present invention is shown in Fig. 7. It comprises a modulation decoding and extracting unit 20 for modulation decoding of the inputted modulation stream M and for extracting therefrom the secondary channel bit stream C2 which has been embedded therein as described above.
  • a first processing unit 21 the primary channel bit stream Cl is processed in the usual way (corresponding to the processing performed in the first preprocessing unit 10 of the encoder).
  • a second processing unit 22 the secondary channel bit stream C2 extracted from the modulation stream M is processed including descrambling consistent with the preprocessing and scrambling performed in the second preprocessing unit 11 during encoding.
  • the physical sector number PSN is again provided from the first processing unit 21 to the second processing unit 22 to use the same scrambling method (inversely) as has been applied during encoding.
  • the primary and secondary channel user data streams P, S are obtained.
  • the present invention is not limited to this very detailed embodiment, neither to the use in BD and the way of setting polarities therein, nor to the use of the particular scrambling method explained above.
  • the invention can be applied in any optical storage system, such as CD, DVD, BD or any future system, where a secondary information signal can be embedded in the primary channel bit stream of a primary information signal by setting the polarity at a predetermined location to represent one bit value of a secondary information bit.
  • any other scrambling method can be used as well as long as it is ensured that during encoding and decoding the same scrambling method is used.
  • the scrambling method can be fixed in advance and pre-stored in the encoder and decoder.
  • the scrambling method could also be stored in the modulation stream itself so that information about the scrambling method applied during encoding is carried along with the modulation stream from the encoder to the decoder. For instance, this information could be stored on a record carrier together with the modulation stream.
  • information from the primary channel bit stream is used for scrambling of the secondary channel bit stream.
  • the PSN has been used for this purpose which is loaded to a linear feedback shift register in which subsequently further scrambling words are calculated.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

La présente invention concerne un dispositif et un procédé correspondant pour intégrer un signal d'informations secondaire (S) au flux de données de canal (C1) d'un signal d'informations primaire (P), pour obtenir un train de modulation (M). Afin d'éviter la formation de motifs de modulations réguliers qui peuvent conduire à des pics de fréquences indésirables dans le spectre de puissance du signal de modulation, l'invention concerne un dispositif qui comprend: une unité d'embrouillage (11) qui sert à embrouiller les bits de canal secondaire du signal d'informations secondaire (S) selon une règle d'embrouillage; et une unité de réglage (12) qui sert à régler la polarité du train de données de canal (C1) aux emplacements prédéterminés, sur la base de la valeur binaire des bits de canal secondaire embrouillés (C2). L'invention a également pour objet un dispositif et un procédé correspondant pour extraire d'un train de modulation (M), un signal d'informations secondaire (S) intégré sous forme embrouillée à un train de données de canal (C1) d'un signal d'informations primaire (P), et un support d'enregistrement et un signal porteur d'un tel train de modulation.
PCT/IB2006/051923 2005-06-21 2006-06-15 Dispositif et procede pour integrer un signal d'informations secondaire au flux de donnees de canal d'un signal d'informations primaire, au moyen d'un embrouillage WO2006136986A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05105493 2005-06-21
EP05105493.0 2005-06-21

Publications (2)

Publication Number Publication Date
WO2006136986A2 true WO2006136986A2 (fr) 2006-12-28
WO2006136986A3 WO2006136986A3 (fr) 2007-04-12

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PCT/IB2006/051923 WO2006136986A2 (fr) 2005-06-21 2006-06-15 Dispositif et procede pour integrer un signal d'informations secondaire au flux de donnees de canal d'un signal d'informations primaire, au moyen d'un embrouillage

Country Status (2)

Country Link
TW (1) TW200705393A (fr)
WO (1) WO2006136986A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2192586A1 (fr) * 2008-11-28 2010-06-02 Kabushi Kaisha Toshiba Système de traitement de signal et support de stockage d'informations

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149560A (en) * 1983-11-10 1985-06-12 Philips Nv Method of and apparatus for, recording and/or reproducing information in or from an optical record carrier
WO1996027191A1 (fr) * 1995-02-28 1996-09-06 Isis Innovation Limited Element d'identification secret
US5949750A (en) * 1993-11-30 1999-09-07 Victor Company Of Japan, Ltd. Method and apparatus for recording an information signal with scrambling thereof
WO2002011136A1 (fr) * 2000-07-28 2002-02-07 Macrovision Europe Limited Protection de disques optiques contre la copie
WO2002015185A1 (fr) * 2000-08-14 2002-02-21 Koninklijke Philips Electronics N.V. Procede et dispositif destines a ajouter ou a extraire un signal d'information secondaire d'une sequence de code rll
WO2004075187A1 (fr) * 2003-02-20 2004-09-02 Koninklijke Philips Electronics N.V. Porteur d'informations comprenant des informations d'acces
WO2005071676A2 (fr) * 2004-01-19 2005-08-04 Koninklijke Philips Electronics N.V. Incorporation d'un signal d'information auxiliaire dans un flot de donnees de canal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2149560A (en) * 1983-11-10 1985-06-12 Philips Nv Method of and apparatus for, recording and/or reproducing information in or from an optical record carrier
US5949750A (en) * 1993-11-30 1999-09-07 Victor Company Of Japan, Ltd. Method and apparatus for recording an information signal with scrambling thereof
WO1996027191A1 (fr) * 1995-02-28 1996-09-06 Isis Innovation Limited Element d'identification secret
WO2002011136A1 (fr) * 2000-07-28 2002-02-07 Macrovision Europe Limited Protection de disques optiques contre la copie
WO2002015185A1 (fr) * 2000-08-14 2002-02-21 Koninklijke Philips Electronics N.V. Procede et dispositif destines a ajouter ou a extraire un signal d'information secondaire d'une sequence de code rll
WO2004075187A1 (fr) * 2003-02-20 2004-09-02 Koninklijke Philips Electronics N.V. Porteur d'informations comprenant des informations d'acces
WO2005071676A2 (fr) * 2004-01-19 2005-08-04 Koninklijke Philips Electronics N.V. Incorporation d'un signal d'information auxiliaire dans un flot de donnees de canal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2192586A1 (fr) * 2008-11-28 2010-06-02 Kabushi Kaisha Toshiba Système de traitement de signal et support de stockage d'informations
US7949071B2 (en) 2008-11-28 2011-05-24 Kabushiki Kaisha Toshiba Signal processing system and information storage medium

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TW200705393A (en) 2007-02-01
WO2006136986A3 (fr) 2007-04-12

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