JP5437332B2 - Automatic light strategy calibration method for optical drive - Google Patents

Description

Cross-reference of related applications

  [0001] This application claims the benefit of US Provisional Application No. 60 / 71,866, filed September 23, 2005. The disclosure of the above application is incorporated herein by reference in its entirety.

Field

  [0002] This disclosure relates to optical media playback devices and media, and more particularly to calibrating a write strategy for an optical media.

background

  [0003] Optical media such as compact discs (CDs) and digital versatile discs (DVDs) store data that is optically read back. Optical discs typically include a substrate consisting of plastic and alternating reflective / non-reflective layers containing continuous helical tracks for data encoding. The optical media playback device reads the data by passing a laser over the track. The light sensor receives light returned from the encoded data on the track.

  [0004] Reference is now made to FIG. An exemplary one-time writable disc (eg, CD-writable disc / CD-R and / or DVD-writable disc / DVD +/- R) 10 generally comprises a polycarbonate plastic substrate 12, a dye layer 14, and a reflective layer. A metal layer 16 is included. For example, the reflective metal layer 16 may include an aluminum layer. When the disk 10 is blank, the dye layer 14 is translucent, and light passes through it to illuminate the reflective metal layer 16 and is reflected from the reflective metal layer 16. When writing to the disk 10 with a laser, a selected portion of the dye layer 14 is heated at a particular intensity and frequency, which makes this selected portion opaque. The opaque part of the dye layer 14 does not reflect light. The opaque non-reflective portion of the dye layer 14 is referred to as a “mark”. Conversely, the translucent reflective portion of the dye layer 14 is referred to as “space”. The optical media playback device may include a read laser that reads data from the disk 10 and a write laser that alters the dye layer 14 for recording purposes.

  [0005] During readback, the optical disc is rotated by the optical media playback device. An optical media playback device typically includes at least one laser, a spindle motor, and an optical sensor. The spindle motor rotates the optical medium. The laser is directed onto the track of the optical medium, and the optical sensor measures the reflected light. If the photosensor produces a high current level corresponding to a high reflectivity (ie space), this data is interpreted as “1” (or “0”). If the light sensor produces a low current level corresponding to low reflectivity (ie, a mark), this data is interpreted as “0” (or “1”). In some devices, a signal commonly described as a space / mark signal, or a converted non-return to zero inverted (NRZI) signal, as shown in FIG. -return to zero non-zero return) signal. Here, 1 represents a transition, and 0 represents the absence of a transition.

  [0006] Reference is now made to FIG. Exemplary rewritable discs (e.g., CD-rewritable disc / CD-RW and / or DVD-rewritable disc / DVD +/- RW) 20 are typically a polycarbonate plastic substrate 22, a dielectric layer 24, a phase change compound layer. 26, and a reflective metal layer 28. The phase change compound layer 26 may be a compound of, for example, silver, antimony, tellurium, and / or indium. The compound is heated above the crystallization and / or melting temperature using a laser. When rapidly cooled from a temperature above this melting temperature, the compound remains in a flowable amorphous state, resulting in a non-reflective portion (ie, mark). Conversely, when held at the crystallization temperature for a period of time, the compound returns to the solid state before being cooled, resulting in a reflective portion (ie, space). Thus, in addition to the read laser, the optical media playback device includes a write laser that is sufficiently powerful to heat the compound above the melting temperature and an erase laser that is sufficiently powerful to heat the compound above the crystallization temperature. May be included.

  [0007] In either the one-time writable disc application or the rewritable disc application, the writing process is non-linear. Marks (and spaces in rewritable disc applications) are generated according to focused heating from a write laser and / or an erase laser. Therefore, thermal diffusion and phase change problems can occur at high rotational speeds of moving optical media.

  [0008] Reference is now made to FIGS. An exemplary laser power profile 30 required to write to a one-time writable medium such as a DVD +/− R medium is shown. In order to form a mark 32 starting from the track position t, a pulse 34 is started at the track position ty. In order to end the mark 32 at the track position u, the pulse 34 is ended at the track position u-x. In other words, the adjustment of the laser power 30 is offset from the desired position of the mark 32 as a result of the thermal diffusion nonlinearity. The position offsets y and x (corresponding to pulse timing edges 36 and 38, respectively) may depend on various factors including, but not limited to, laser power 30, media type, and / or its writing speed.

  [0009] Reference is now made to FIGS. 5A and 5B. A typical laser power profile 40 required to write to a rewritable medium such as DVD +/− RW is shown. The write pulse 42 is greater than both the cooling power level 44 and the erase power level 46. Similar to the laser profile 30 as shown in FIGS. 4A-4D, these pulses 42 begin prior to the desired start position t of the mark 48 and end prior to the desired end position u of the mark 48. The

  [0010] Due to the non-linear nature of heating-based writing to optical media, these various power levels and pulse timing edges are in accordance with individual desired mark lengths (ie, based on each mark length). It is necessary to calibrate. Furthermore, this calibration relies on the leading and trailing spaces adjacent to the mark and on either side of the mark. In the encoding scheme used in current optical media recording standards, the length of both marks and spaces is in the range of 3T to 14T. Here, T is a channel bit period.

  [0011] A write strategy table provided in the optical drive stores data entries that specify how a particular mark length should be formed. In other words, because the writing process is non-linear, the write strategy table includes laser power, pulse timing edges, and other related data for each mark length. Usually, the write strategy table is stored in a non-volatile memory module such as a flash memory module provided in the optical drive.

  [0012] Configuring a write strategy table generally requires a calibration sequence that depends on both the media type (eg, media manufacturer) and its writing speed. The calibration sequence is performed during manufacture for each optical medium playback device. In addition, this calibration sequence contains data to account for all possible known media types that can be utilized by potential users for optical media playback devices and is stored in a non-volatile memory module. The

  [0013] However, when a new media type is introduced by the media manufacturer, the write strategy table must be updated. For example, the user can download new firmware (eg, from the Internet) that includes an updated write strategy table from the manufacturer. When Internet access is not available, the user needs to obtain an update disk from the manufacturer via the shopping center. In some situations, the user may unintentionally obtain counterfeit or non-specific media that cannot be properly written using the original write strategy table. Thus, any updates from the drive manufacturer may not solve the resulting write problem. Often, consumers purchase optical media playback devices such as DVD drives and attempt to operate these drives using low cost media. When consumers find that these drives cannot properly write to or read the media, many return the drive to the store, which adds cost to the drive manufacturer. It is.

Overview

  [0014] A write strategy calibration system for an optical media playback device includes a memory for storing a write strategy table. The control module generates a write signal and writes the training pattern to the optical storage medium according to the calibration data stored in the write strategy table. The write strategy analysis module receives a read signal indicating a training pattern written in the optical storage medium, and adjusts calibration data according to the read signal.

  [0015] In other features of the invention, the training pattern includes a preamble pattern and a main data sequence, each of which includes a mark pattern and a space pattern indicating binary data. The training pattern includes a synchronization mark indicating the end of the preamble pattern and the start of the main data sequence. The main data sequence includes mark patterns and space patterns that represent all possible combinations of mark length and space length. The training pattern further includes a reference pattern interspersed with at least one of the training pattern and the main data sequence.

  [0016] In other features of the invention, the timing module obtains a timing lock on the training pattern according to at least one of the preamble pattern and the reference pattern. The timing module obtains a timing lock at the first transition edge of the reference pattern. The first transition edge is one of a front (rising) transition edge and a rear (falling) transition edge of the reference pattern. The mark and space patterns forming the preamble pattern are equivalent to the reference pattern. The write strategy analysis module reads transition edges from the training pattern. At least one of the write strategy analysis module and the timing module selectively adjusts the timing lock. The write strategy analysis module includes a timing module.

  [0017] In other features of the invention, the optical media playback device includes a write strategy calibration system. The optical media playback device is at least one of a compact disc (CD) writable drive, a CD rewritable drive, a digital versatile disc (DVD) writable drive, a DVD rewritable drive, a Blu-ray DVD drive, and an HDDVD drive. is there. The write strategy table has calibration data for known optical storage media types. The optical medium reproducing device rewrites the training pattern after adjusting the calibration data in the write strategy table. The write strategy table is stored in at least one of a volatile memory and a nonvolatile memory. The write strategy table is implemented by firmware of the optical medium playback device. The write strategy analysis module communicates with the firmware of the optical medium playback device to adjust the calibration data.

ここで、ｘＳ／ｙＭのマークとスペースの組合せは、ｘの長さを有するスペースと、ｙの長さを有するマークとを含んでおり、ｘとｙは整数であり、またこのトレーニングパターンは、ＤＣバランシングのための冗長パターンを更に含んでいる。 [0018] In other features of the invention, the training pattern includes a main data sequence having a mark and space combination according to the following table.

Here, the combination of xS / yM mark and space includes a space having a length of x and a mark having a length of y, where x and y are integers, and this training pattern is It further includes a redundant pattern for DC balancing.

  [0019] A method for calibrating a write strategy for an optical media playback device includes storing a write strategy table, generating a write signal, and training the optical storage medium according to calibration data stored in the write strategy table. Writing a pattern; receiving a read signal indicating a training pattern written to the optical storage medium; and adjusting calibration data according to the read signal.

  [0020] In other features of the invention, the training pattern includes a mark pattern and a space pattern, each of which includes a preamble pattern indicative of binary data and a main data sequence. The training pattern includes a synchronization mark indicating the end of the preamble pattern and the start of the main data sequence. The main data sequence includes mark and space patterns that represent all possible combinations of mark length and space length. The training pattern further includes a reference pattern interspersed with at least one of the training pattern and the main data sequence.

  [0021] In other features of the invention, the method further includes obtaining a timing lock on the training pattern according to at least one of the preamble pattern and the reference pattern. The step of acquiring includes the step of acquiring a timing lock on the first transition edge of the reference pattern. The first transition edge is one of the front transition edge and the rear transition edge of the reference pattern. The mark and space patterns forming the preamble pattern are equivalent to the reference pattern.

  [0022] In other features of the invention, the method further includes reading transition edges from the training pattern. The method further includes selectively adjusting the timing lock. The write strategy table contains calibration data for known optical storage media types. The method further includes the step of rewriting the training pattern after adjusting the calibration data in the write strategy table. The storing step includes storing the write strategy table in at least one of volatile memory and nonvolatile memory. The write strategy table is implemented by firmware of the optical medium playback device. The method further includes communicating with the firmware of the optical media playback device to adjust the calibration data.

ここで、ｘＳ／ｙＭのマークとスペースの組合せは、ｘの長さを有するスペースと、ｙの長さを有するマークとを含んでおり、ｘとｙは整数であり、またトレーニングパターンは、ＤＣバランシングのための冗長パターンを更に含んでいる。 [0023] In other features of the invention, the training pattern includes a main data sequence that includes a combination of marks and spaces according to the following table.

Here, the combination of xS / yM mark and space includes a space having a length of x and a mark having a length of y, where x and y are integers, and the training pattern is DC It further includes a redundant pattern for balancing.

  [0024] A write strategy calibration system for an optical media playback device includes a memory means for storing a write strategy table and a write pattern generated on the optical storage medium in accordance with calibration data stored in the write strategy table. Control means for writing, and write strategy analysis means for receiving a read signal indicating the training pattern written in the optical storage medium and adjusting the calibration data in accordance with the read signal.

  [0025] In other features of the invention, the training pattern includes a preamble pattern and a main data sequence, each of which includes a mark pattern and a space pattern indicating binary data. The training pattern includes a synchronization mark indicating the end of the preamble pattern and the start of the main data sequence. The main data sequence includes mark and space patterns that represent all possible combinations of mark length and space length. The training pattern further includes a reference pattern interspersed with at least one of the training pattern and the main data sequence.

  [0026] In other features of the invention, the write strategy calibration system includes timing means for obtaining a timing lock on the training pattern according to at least one of a preamble pattern and a reference pattern. The timing means obtains a timing lock on the first transition edge of the reference pattern. The first transition edge is one of the front transition edge and the rear transition edge of the reference pattern. The mark and space patterns forming the preamble pattern are equivalent to the reference pattern. The write strategy analysis means reads the transition edge from the training pattern. At least one of the write strategy analysis means and the timing means selectively adjusts the timing lock. The write strategy analysis means includes timing means.

  [0027] In other features of the invention, the optical media playback device includes a write strategy calibration system. The optical media playback device is at least one of a compact disc (CD) writable drive, a CD rewritable drive, a digital versatile disc (DVD) writable drive, a DVD rewritable drive, a Blu-ray DVD drive, and an HDDVD drive. is there. The write strategy table contains calibration data for known optical storage media types. The optical medium reproducing device rewrites the training pattern after adjusting the calibration data in the write strategy table. The write strategy table is stored in at least one of a volatile memory and a nonvolatile memory. The write strategy table is implemented by firmware of the optical medium playback device. The write strategy analysis unit communicates with the firmware of the optical medium playback device to adjust the calibration data.

ここで、ｘＳ／ｙＭのマークとスペースの組合せは、ｘの長さを有するスペースと、ｙの長さを有するマークとを含んでおり、ｘとｙは整数であり、またトレーニングパターンは、ＤＣバランシングのための冗長パターンを更に含んでいる。 [0028] In other features of the invention, the training pattern includes a main data sequence that includes a combination of marks and spaces according to the following table.

Here, the combination of xS / yM mark and space includes a space having a length of x and a mark having a length of y, where x and y are integers, and the training pattern is DC It further includes a redundant pattern for balancing.

  [0029] A computer program executed by a processor that calibrates a write strategy for an optical media playback device stores a write strategy table, generates a write signal, and stores calibration data stored in the write strategy table Writing a training pattern to the optical storage medium according to the method, receiving a read signal indicating the training pattern written to the optical storage medium, and adjusting the calibration data according to the read signal.

  [0030] In other features of the invention, the training pattern includes a preamble pattern and a main data sequence, each of which includes a mark pattern and a space pattern indicating binary data. The training pattern includes a synchronization mark indicating the end of the preamble pattern and the start of the main data sequence. The main data sequence includes mark patterns and space patterns that represent all possible combinations of mark length and space length. The training pattern further includes a reference pattern interspersed with at least one of the training pattern and the main data sequence.

  [0031] In other features of the invention, the computer program further includes obtaining a timing lock on the training pattern according to at least one of the preamble pattern and the reference pattern. The obtaining step includes obtaining a timing lock on the first transition edge of the reference pattern. The first transition edge is one of the front transition edge and the rear transition edge of the reference pattern. The mark and space patterns forming the preamble pattern are equivalent to the reference pattern.

  [0032] In other features of the invention, the computer program further comprises reading transition edges from the training pattern. The computer program further includes the step of selectively adjusting the timing lock. The write strategy table contains calibration data for known optical storage media types. The computer program further includes the step of rewriting the training pattern after adjusting the calibration data in the write strategy table. The storing step includes the step of storing the write strategy table in at least one of the volatile memory and the nonvolatile memory. The write strategy table is implemented by firmware of the optical medium playback device. The computer program further includes communicating with the firmware of the optical media playback device to adjust the calibration data.

ここで、ｘＳ／ｙＭのマークとスペースの組合せは、ｘの長さを有するスペースと、ｙの長さを有するマークとを含んでおり、ｘとｙは整数であり、またトレーニングパターンは、ＤＣバランシングのための冗長パターンを更に含んでいる。 [0033] In other features of the invention, the training pattern includes a main data sequence that includes a combination of marks and spaces according to the following table.

Here, the combination of xS / yM mark and space includes a space having a length of x and a mark having a length of y, where x and y are integers, and the training pattern is DC It further includes a redundant pattern for balancing.

  [0034] In still other features, the systems and methods described above are implemented by a computer program executed by one or more processors. The computer program can reside on a computer readable medium such as, but not limited to, memory, non-volatile data storage media, and / or other suitable tangible storage media.

  [0035] Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. While the preferred embodiments of the present invention are shown, it is understood that these detailed descriptions and specific examples are for purposes of illustration and are not intended to limit the scope of the invention. I want to be.

  [0036] The present invention will become more fully understood from this detailed description and the accompanying drawings, wherein:

Detailed Description of the Preferred Embodiment

  [0056] The following description of one (or more) preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. . For purposes of clarity, the same reference numbers will be used in the drawings to identify similar elements. As used herein, the terms module, circuit, and / or device refer to an ASIC (Application Specific Integrated Circuit), electronic circuit, which executes one or more software programs or firmware programs, Means processor (shared, dedicated, or group) and memory, combinatorial logic, and / or other suitable components that implement the functions described. As used herein, the phrase at least one of A, B, and C is taken to mean logic (A or B or C) using non-exclusive OR. Should. It should be understood that the internal steps of a method can be performed in a different order without changing the principles of the invention.

  [0057] The present invention allows optical media playback devices to adapt to a variety of writable and / or rewritable media types without having to rely on manufacturer or firmware updates. As a result, consumer satisfaction and manufacturer profitability are improved by increasing sales and decreasing product return rates.

  [0058] More specifically, the present invention allows for automated calibration of a write strategy table stored on an optical media playback device. The optical medium reproducing device realizes high-precision control of the write strategy laser pulse and high-precision measurement of data written by the writing laser. In current optical media storage technology, high precision control of write strategy pulses has been available for several generations of products. However, conventionally, integrated circuits or modules that perform both writing and high-precision measurements are not available. High-precision measurements of readback waveforms can be performed using expensive instruments (eg, high-speed digital sampling scopes), but for such implementations, factories, laboratories, or other high-cost It is limited to only the production environment.

  [0059] Reference is now made to FIG. The present invention is implemented in an optical medium playback device 50 such as a DVD system. The optical media playback device 50 is shown to include a DVD printed circuit board (PCB) 52 that is read data, write data, and / or volatile related to the control of the optical media playback device 50. A buffer 54 for storing control codes is included. The buffer 54 may be a volatile memory such as SDRAM or other types of low latency memory. Nonvolatile memory 55, such as flash memory, can also be used for critical data, such as data associated with DVD write formats and / or other non-volatile control codes. A processor 56 disposed on the DVD PCB 52 performs data processing and / or control processing related to the operation of the optical medium playback device 50. The processor 56 also performs copy protection and / or compression / decompression decoding as required. DVD control module 58 communicates with input / output interface 60, spindle / feed motor (FM) driver 62, and / or read / write channel module 64. The DVD control module 58 coordinates (coordinates) the control of the spindle / FM driver, the read / write channel module 64 and the processor 56, and data input / output via the interface 60.

  [0060] During a write operation, the read / write channel module 64 encodes data to be written to the DVD platter by an optical read / write (ORW) or optical read only (OR) device 66. The read / write channel module 64 processes the signal for reliability and can apply, for example, error checking correction (ECC) encoding, run length limited (RLL) encoding, and the like. During a read operation, the read / write channel module 64 converts the analog output of the ORW or OR device 66 into a digital signal. Next, the signal converted by a known technique is detected and decoded to reproduce the data written on the DVD.

  [0061] DVD assembly (DVDA) 68 includes an optical storage medium 70, such as a DVD platter, that optically stores data. The optical storage medium 70 is rotated by a spindle motor schematically shown at 71. The spindle motor 71 rotates the optical storage medium 70 at a controlled speed and / or a variable speed during read / write operations. The ORW or OR device 66 moves relative to the optical storage medium 70 to read and / or write data to or from the optical storage medium 70. The ORW or OR device 66 typically includes a laser and an optical sensor.

  [0062] In DVD read / write systems and DVD read-only systems, the laser is directed at a track on the optical storage medium 70 during a read operation. The light sensor senses reflections caused by land / pits. In DVD read / write (RW) applications, a laser is also used to heat the dye layer on the optical storage medium 70 during a write operation.

  [0063] The spindle / FM driver 62 controls the spindle motor 71, thereby causing the optical storage medium 70 to be controllably rotated. The spindle / FM driver 62 also generates a control signal that positions the feed motor 72 using, for example, a voice coil actuator, a stepper motor, or other suitable actuator. The feed motor 72 moves the ORW or OR device 66 generally in a radial direction relative to the optical storage medium 70. The laser driver 73 generates a laser drive signal based on the output of the read / write channel module 64. DVDA 68 includes a preamplifier circuit 74 that amplifies the analog read signal. When reading data, the preamplifier circuit 74 amplifies the low level signal from the ORW or OR device 66 and outputs the amplified signal to the read / write channel module 64.

  [0064] The optical media playback device 50 further includes a codec module 75 for encoding and / or decoding video, such as any of the MPEG formats. Audio and / or video digital signal processors and / or modules 76 and 77 perform audio and / or video signal processing, respectively.

  [0065] A portion of the optical media playback device 50 may be implemented by one or more integrated circuits (ICs) or chips. For example, the processor 56 and the DVD control module 58 can be implemented by a single chip. The spindle / FM driver 62 and / or the read / write channel module 64 can also be implemented by the same chip as the processor 56, DVD control module 58, and / or additional chips. Most optical media playback devices 50 other than DVDA 68 can also be implemented as SOC.

  [0066] The optical media playback device 50 stores and dynamically updates the write strategy table. For example, the optical medium playback device 50 can store the write strategy table in the volatile memory 54 and / or the nonvolatile memory 55. The write strategy table includes calibration data. The optical medium playback device 50 writes to the optical storage medium 70 (via the read / write channel module 64 and / or the laser driver 73) according to the calibration data stored in the write strategy table. The optical media playback device 50 updates the calibration data stored in the write strategy table according to the specific type of optical storage medium 70 used. Therefore, an update initiated from outside the calibration data is not necessary.

  [0067] To update the write strategy table, the optical media playback device 50 first writes a training pattern to the optical storage medium 70 according to the initial write strategy. The training pattern may include data representing all possible mark length and space length combinations. The initial write strategy may include laser power data or other data according to known optical media types. For example, an initial write strategy for a known media type can be stored in firmware (eg, non-volatile memory 55) and / or on optical storage medium 70. For unknown media types, an initial write strategy may be estimated. For example, the initial write strategy can be a default write strategy stored in firmware and / or a previously used write strategy.

  [0068] Optical media playback device 50 then reads the written training pattern from optical storage media 70 (via ORW or OR device 66 and / or read / write channel module 64). The optical media playback device 50 analyzes the written training pattern to determine whether the length and location of the mark and space correspond to the intended length and location of the pattern. In other words, the optical media playback device 50 determines the distance that the marks and spaces are offset from the intended location. Based on the offset distance, the optical medium reproducing device 50 adjusts the write strategy table to additionally correct the calibration data. For example, the optical media playback device 50 can adjust the write strategy table to reflect whether the written mark is too long or too short, based on the initial strategy.

  [0069] The optical medium playback device 50 rewrites the training pattern to the optical storage medium 70 according to the updated write strategy table, and rereads the training pattern written for analysis. The optical media playback device 50 repeats this procedure until it is determined that it can accept the write strategy.

  [0070] Reference is now made to FIG. The automatic write strategy calibration method 80 begins at step 82. In step 84, the optical media playback device 50 implementing the method 80 is powered on. In step 86, the optical media playback device 50 writes the training pattern to the optical storage medium 70. In step 88, the optical medium playback device 50 reads the training pattern written from the optical storage medium 70. In step 90, the optical medium reproducing device 50 analyzes the written training pattern to obtain the data offset. In step 92, the optical media playback device 50 determines whether the written training pattern can be accepted based on the offset. If true, method 80 proceeds to step 94. If false, method 80 proceeds to step 96.

  [0071] In step 94, the optical media playback device 50 continues normal operation. For example, the optical medium playback device 50 may write data to the optical storage medium 70 according to the current write strategy table. The optical media playback device 50 may continue to operate until it is powered off at step 98 and / or until a new optical storage medium 70 is presented.

  [0072] In step 96, the optical media playback device 50 adjusts the write strategy table based on the analysis of the written training pattern. The method 80 then proceeds to step 86. In this way, the method 80 continues to adjust the write strategy table and analyze the resulting training pattern until an acceptable write strategy is found.

  [0073] Referring now to FIGS. 8 and 9, the operation of the optical media playback device 50 is described in further detail. Data stored on the optical storage medium 70 typically includes alternating synchronization patterns 100 and data blocks 102. The synchronization pattern 100 is used to specify the data block 102. In other words, the optical medium playback device 50 needs to be able to identify the location of the synchronization pattern 100 in order to be able to read the corresponding data block 102 properly.

  [0074] The optical media playback device 50 may include a sync detector module 104 and a timing module 106. For example, the sync detector module 104 and / or the timing module 106 can be located elsewhere on the read / write channel module 64, the DVD control module 58, and / or the DVD PCB 52, as shown in FIG. . The sync detector module 104 is used to identify the sync pattern 100. More specifically, the sync detector module 104 receives readback data 108 read from the optical storage medium 70 and identifies transition edges in the sync pattern 100. The timing module 106 generates a timing signal 110 for the sync detector module 104 and / or other modules disposed within the optical media playback device 50. Synchronization detector module 104 generates timing error signal 112 to adjust the timing loop of timing module 106. In this way, this timing loop can be locked against transition edges in the written pattern. For example, the timing loop can lock on to the forward and / or backward transition edges in the written pattern.

  [0075] The optical media playback device 50 further includes a write strategy analysis module 120. For example, the write strategy analysis module 120 can be located elsewhere on the read / write channel module 64, the DVD control module 58, and / or the DVD PCB 52 as described in FIG. The write strategy analysis module 120 receives the synchronization detection signal 122 from the synchronization detector module 104, the timing signal 110 from the timing module 106, and the readback data 108. The write strategy analysis module 120 determines when to receive the data block 102 according to the synchronization detection signal 122. The write strategy analysis module 120 receives transition edges in the data block 102 accordingly. For example, the write strategy analysis module 120 can receive the readback data 108 on the digital channel 124. Readback parameters for digital channel 124 may be selected according to the particular ORW or OR device used to read data from optical storage medium 70. Appropriate settings for these parameters can be determined according to conventional calibration attempts. In other implementations, the write strategy analysis module 120 includes a timing module 106 and / or a sync detector module 104.

  [0076] The write strategy analysis module 120 then analyzes the marks and spaces of the written training pattern, as shown in FIGS. Alternatively, the transition edge and the written training pattern can be analyzed by an analysis program stored in the firmware of the optical medium playback device 50. The write strategy analysis module 120 (and / or firmware) updates the write strategy table according to this analysis.

  [0077] Reference is now made to FIG. The optical medium playback device 50 writes an exemplary training pattern 130 as shown in the figure. The training pattern 130 includes a preamble pattern 132 and a main data sequence 134. The preamble pattern 132 may correspond to the synchronization pattern 100 as described with reference to FIG. 8 and may include a reference pattern 136 interspersed in the preamble pattern 132. Preamble pattern 132 is provided so that synchronization detector module 104 and timing module 106 can lock the timing loop onto the leading edge 136 of training pattern 130 (and reference pattern 136). The synchronization mark 138 indicates the end of the preamble pattern 132 and the start of the main data sequence 134. The preamble pattern 132 and / or the reference pattern 136 can be formed based on the minimum transition interval of the optical medium playback device 50 and / or the optical storage medium 70. For example, the minimum transition interval for the current standard DVD using a red laser is 3T (3-channel bit period) for both space length and mark length. One skilled in the art will appreciate that other spacings between the preamble pattern 132 and the reference pattern 136 are possible. As shown in the figure, the preamble pattern 132 is 3S / 3M, 3S / 3M, 3S / 3M,..., 3S / 3M. Here, the notation xS / yM indicates a pattern including a space having a length of xT followed by a mark having a length of yT. As shown in the figure, the synchronization mark 138 is 10S / 3M.

[0078] The main data sequence 134 includes data representing all possible mark length and space length combinations. For example, the main data sequence includes a combination of mark length and space length according to the following exemplary table.

  [0079] The table above shows a main data sequence 134 including a space length of 5T or less and a mark length of 14T or less. In other words, the table above assumes that space lengths greater than 5T do not affect mark formation. However, those skilled in the art will appreciate that the main data sequence 134 may include larger space lengths such as 6T, 7T,..., And / or 14T. Further, the main data sequence 134 can include a pattern representing the rear space length (ie, a pattern representing the space following the mark). In this implementation, the main data sequence 134 is configured to be substantially free of DC components so that channel offsets can be removed through the use of AC coupling. As a result, the processing of readback data is simplified. In other implementations, an AC / DC coupling circuit is included as described in US patent application Ser. No. 11 / 185,563, filed Jul. 20, 2005, which is incorporated herein by reference in its entirety. You can also.

  [0080] The main data sequence 134 may include a redundancy pattern for DC balancing as shown in the table above. This redundant pattern is configured such that the timing loop can be locked to the DC offset signal. For example, the redundant pattern can include alternating bit patterns such as 1010101. This DC offset signal can then be removed.

  [0081] As described in FIGS. 8, 9, and 10, the timing loop locks against transition edges in the training pattern 130. During the calibration process, the timing loop preferably locks against the transition edge with a minimal amount of uncertainty. In this implementation, the initially selected transition edge is the front edge of the 3T mark, and the timing loop attempts to lock against the front edge of the 3T mark during the 3S / 3M preamble readback. . Therefore, the timing loop should complete the timing lock prior to detecting the sync mark 138.

  [0082] When the digital channel 124 of the write strategy analysis module 120 begins to process 4S / 3M data and 5S / 3M data during the readback of the main data sequence 134, the backward transition location of the 3T mark is different. It can be measured against pacing history. For example, the trailing edge of a 3T mark preceding a 4T space can be measured based on an analysis of a 3S / 3M pattern and a 4S / 3M pattern. Similarly, the trailing edge of a 3T mark preceding a 5T space can be measured based on an analysis of the 3S / 3M pattern and the 5S / 3M pattern. After these initial measurements, the timing loop can be locked to the trailing edge of any 3T mark in the main data sequence and the remaining backward transition edges of the data pattern can be measured. Alternatively, this timing loop can remain locked to the leading edge of the 3T mark and / or against the leading edge of the 3T mark at reduced bandwidth throughout the entire readback process. Can remain locked. The write strategy table is updated based on the measurement and analysis of all patterns included in the main data sequence 134.

  [0083] In other implementations, the optical media playback device 50 may include a write laser power (eg, from a minimum power level to a maximum power level) for a particular pattern until a particular desired result is achieved. And timing can be adjusted. For example, the optical medium reproducing device 50 can adjust the power and timing of the writing laser for the 3S / 3M pattern of the preamble pattern 132. In this way, the power level and timing required to achieve maximum contrast (ie, peak-to-peak measurements) and / or optimal duty cycle (eg, 50% duty cycle) can be determined. .

  [0084] Reference is now made to FIG. The present invention can be implemented in a high-definition television (HDTV) 420, which can be implemented in either or both of signal processing circuitry and / or control circuitry, generally identified at 422, WLAN interface, HDTV 420. Mass data storage and / or power supply 423 is included. The present invention may implement mass data storage 427 and / or may be implemented with mass data storage 427. The HDTV 420 receives the HDTV input signal in a wired format or a wireless format and generates an HDTV output signal for the display 426. In some implementations, the signal processing and / or control circuit 422 of HDTV 420 and / or other circuitry (not shown) processes the data, performs encoding and / or encryption, and computes , Format the data, or perform any other type of HDTV processing that may be required, or any combination thereof.

  [0085] The HDTV 420 may communicate with mass data storage 427 that stores data in a nonvolatile manner, such as an optical storage device. HDTV 420 may be connected to memory 428 such as RAM, ROM, low latency nonvolatile memory such as flash memory, and / or other suitable electronic data storage. The HDTV 420 can also support connection to a WLAN via the WLAN network interface 429.

  [0086] Reference is now made to FIG. The vehicle 430 includes a vehicle control system and a power source 433. The present invention may be implemented with and / or implemented with mass data storage in a vehicle control system. The vehicle control system implements a powertrain control system 432 that includes one or more of a temperature sensor, pressure sensor, rotation sensor, airflow sensor, and / or any other suitable sensor. Receives input from the sensors and / or generates one or more output control signals, such as engine operating parameters, transmission operating parameters, and / or other control signals.

  [0087] The present invention may also be implemented in other control systems 440 of the vehicle 430. Control system 440 may similarly receive signals from input sensor 442 and / or output control signals to one or more output devices 444. In some implementations, the control system 440 includes an ABS (anti-lock braking system), a navigation system, a telematics system, a vehicle telematics system, a lane departure system, an adaptive cruise control system, and / Or can be part of a vehicle entertainment system such as stereo, DVD, compact disc. Still other implementations are contemplated.

  [0088] The powertrain control system 432 may communicate with mass data storage 446 that stores data in a nonvolatile manner. Mass data storage 446 may include optical storage devices and / or magnetic storage devices, such as hard disk drives HDD and / or DVDs. The powertrain control system 432 may connect to memory 447 such as RAM, ROM, low latency nonvolatile memory such as flash memory, and / or other suitable electronic data storage. The powertrain control system 432 may also support connection with a WLAN via a WLAN network interface 448. The control system 440 may also include mass data storage, memory, and / or a WLAN interface (all not shown).

  [0089] Reference is now made to FIG. The present invention may be implemented in a mobile phone 450 that may include a cellular antenna 451. Cellular phone 450 includes either or both of signal processing circuitry and / or control circuitry, generally identified at 452, a WLAN interface, mass data storage for cellular phone 450, and / or power supply 453. The present invention may be implemented with mass data storage of mobile phone 450 and / or implemented with mass data storage. In some implementations, the mobile phone 450 includes a microphone 456, an audio output 458, such as a speaker and / or audio output jack, a display 460, and / or a keypad, pointing device, voice driven device, and / or other An input device 462, such as an input device, is included. Signal processing circuitry and / or control circuitry 452 and / or other circuitry (not shown) in mobile phone 450 processes the data, performs encoding and / or encryption, performs calculations, and performs data processing. And / or other mobile phone functions may be implemented.

  [0090] The cell phone 450 may communicate with mass data storage 464 that stores data in a nonvolatile manner, such as optical and / or magnetic storage devices, eg, hard disk drives HDD and / or DVDs. The cell phone 450 may be connected to memory 466 such as RAM, ROM, low latency non-volatile memory such as flash memory, and / or other suitable electronic data storage. The mobile phone 450 can also support connection to a WLAN via the WLAN network interface 468.

  [0091] Reference is now made to FIG. The present invention may be implemented with a set top box 480. Set top box 480 includes either or both of signal processing circuitry and / or control circuitry identified generally at 484, a WLAN interface, mass data storage of set top box 480, and / or power supply 483. The present invention may implement mass data storage for set top box 480 and / or may be implemented with mass data storage. The set top box 480 receives signals from a source such as a broadband source, and is suitable for a standard and / or high display 488 such as a television and / or monitor, and / or other video and / or audio output devices. Outputs high definition audio / video signals. The signal processing circuitry and / or control circuitry 484 of set top box 480 and / or other circuitry (not shown) may process the data, perform encoding and / or encryption, perform calculations, The data may be formatted and / or any other set top box function may be implemented.

  [0092] The set top box 480 may communicate with mass data storage 490 that stores data in a nonvolatile manner. Mass data storage 490 may include optical storage devices and / or magnetic storage devices, such as hard disk drives HDD and / or DVDs. Set top box 480 may connect to memory 494 such as RAM, ROM, low latency nonvolatile memory such as flash memory, and / or other suitable electronic data storage. The set top box 480 can also support connection to a WLAN via a WLAN network interface 496.

  [0093] Reference is now made to FIG. The present invention may be implemented in the media player 500. The media player 500 includes either or both of signal processing circuitry and / or control circuitry identified generally at 504, a WLAN interface, media data storage for the media player 500, and / or a power supply 503. The present invention may implement mass data storage of media player 500 and / or may be implemented with mass data storage. In some implementations, the media player 500 includes a display 507 and / or user input 508 such as a keypad, touchpad, and the like. In some implementations, the media player 500 typically includes a graphical user interface (GUI) that uses a menu, drop-down menu, icon and / or point-and-click interface via the display 507 and / or user input 508. ) Can be used. Media player 500 further includes an audio output 509, such as a speaker and / or an audio output jack. The signal processing circuit and / or control circuit 504 and / or other circuit (not shown) of the media player 500 processes the data, performs encoding and / or encryption, performs calculations, and performs data processing. And / or any other media player function may be implemented.

  [0094] The media player 500 may communicate with mass data storage 510 that stores data such as compressed audio content and / or video content in a nonvolatile manner. In some implementations, the compressed audio file includes a file that conforms to the MP3 format, or other suitable compressed audio and / or video format. Mass data storage may include optical storage devices and / or magnetic storage devices, such as hard disk drives HDD and / or DVDs. The media player 500 may be connected to memory 514 such as RAM, ROM, low latency nonvolatile memory such as flash memory, and / or other suitable electronic data storage. The media player 500 may also support connection with a WLAN via a WLAN network interface 516. In addition to these implementations described above, still other implementations are contemplated.

  [0095] Those skilled in the art can now appreciate from the foregoing description that the broad teachings of the present invention can be implemented in a variety of forms. Thus, while the invention has been described with reference to specific embodiments thereof, other modifications will become readily apparent to those skilled in the art upon review of the drawings, the specification, and the appended claims. As such, the true scope of the present invention should not be so limited.

It is sectional drawing of the one-time writable optical disk by a prior art. FIG. 3 shows an exemplary mark / space signal generated by an optical reproducing device that reads an optical medium and a corresponding NRZI converted signal. It is sectional drawing of the rewritable optical disk by a prior art. FIG. 2 shows a first exemplary laser power profile for writing to a one-time writable optical medium according to the prior art. FIG. 4 shows a second exemplary laser power profile for writing to a one-time writable optical medium according to the prior art. FIG. 6 shows a third exemplary laser power profile for writing to a one-time writable optical medium according to the prior art. FIG. 6 shows a fourth exemplary laser power profile for writing to a one-time writable optical medium according to the prior art. FIG. 2 shows a first exemplary laser power profile for writing to a rewritable optical medium according to the prior art. FIG. 3 shows a second exemplary laser power profile for writing to a rewritable optical medium according to the prior art. FIG. 3 is a functional block diagram of an optical medium reproducing device including a write strategy table according to the present invention. It is a figure which shows the step of the automatic write strategy calibration method by this invention. FIG. 4 shows an exemplary alternating synchronization pattern and data block according to the present invention. 2 is a functional block diagram of an exemplary optical medium playback device including a write strategy analysis module according to the present invention. FIG. 4 illustrates an exemplary training pattern according to the present invention. It is a functional block diagram of a high-definition television. It is a functional block diagram of a vehicle control system. It is a functional block diagram of a mobile phone. It is a functional block diagram of a set top box. It is a functional block diagram of a media player.

  DESCRIPTION OF SYMBOLS 50 ... Optical medium reproducing device, 52 ... DVD PCB, 54 ... Volatile memory, 55 ... Non-volatile memory, 56 ... Processor, 58 ... DVD control module, 60 ... Input / output interface, 62 ... Spindle / feed motor (FM) driver 64 ... Read / write channel module, 66 ... Optical read / write (ORW) or optical read only (OR) device, 68 ... DVD assembly (DVDA), 70 ... Optical storage medium, 71 ... Spindle motor, 72 ... Feed motor 73 ... Laser driver, 74 ... Preamplifier circuit, 75 ... Codec module, 76 ... Audio digital signal processor, 77 ... Video digital signal processor, 104 ... Synchronization detector module, 106 ... Timing module, 120 ... Write strategy Analysis module, 124 ... digital channel.

Claims (13)

A write strategy calibration system for an optical media playback device,
A memory for storing a write strategy table;
A control module, the control module comprising:
A write signal is generated and a training pattern is written to the optical storage medium according to the calibration data stored in the write strategy table, and the training pattern has a plurality of marks and a plurality of spaces formed by the first pattern. Including a preamble pattern and a main data sequence having a plurality of marks and a plurality of spaces formed by a second pattern different from the first pattern, and the calibration data has a plurality of specific lengths. Specifies how the mark should be formed on the optical media device,
Read the training pattern previously written to the optical storage medium and determine whether one length of the plurality of marks of the main data sequence corresponds to the specific length specified by the calibration data And
Adjusting the calibration data stored in the memory in response to the one length of the plurality of marks not corresponding to the specific length specified by the calibration data;
The main data sequence includes a redundant pattern, and the redundant pattern includes two spaces having the same first length and two marks having the same second length, and includes a DC offset signal. A control module that appears in the main data sequence and the control module locks to and removes the DC offset signal caused in response to the redundancy pattern;
A light strategy calibration system comprising:   The write strategy calibration system according to claim 1, wherein the preamble pattern is formed based on a minimum transition interval of the optical medium playback device and / or the optical storage medium.   The write strategy calibration system according to claim 1, wherein the training pattern includes a synchronization mark indicating an end of the preamble pattern and a start of the main data sequence.   The write strategy calibration system according to claim 1, wherein the main data sequence includes mark length / space length combinations representing all possible combinations of mark length and space length.   An optical medium reproducing device comprising the write strategy calibration system according to claim 1.   6. A compact disc (CD) writable drive, a CD rewritable drive, a digital versatile disc (DVD) writable drive, a DVD rewritable drive, a Blu-ray DVD drive, and an HD DVD drive. An optical medium reproducing device according to 1.   The write strategy calibration system of claim 1, wherein the write strategy table includes calibration data for known optical storage media types.   The write strategy calibration system according to claim 1, wherein the optical medium reproducing device rewrites the training pattern after adjusting the calibration data in the write strategy table.   The write strategy calibration system according to claim 1, wherein the write strategy table is stored in at least one of a volatile memory and a nonvolatile memory.   The write strategy calibration system according to claim 1, wherein the write strategy table is implemented by firmware of the optical medium playback device.   The light strategy calibration system of claim 1, wherein the control module selects the training pattern based on whether the optical storage medium is a known medium type or an unknown medium type.   The optical medium reproducing device according to claim 1, wherein the main data sequence further includes a plurality of marks and a plurality of spaces formed in a third pattern different from the second pattern.   2. The optical medium reproducing device according to claim 1, wherein the main data sequence includes a plurality of marks and a plurality of spaces formed in a plurality of different patterns, and the plurality of different patterns include the second pattern.

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