JP2008047216A - Adaptively learning method and apparatus for improving write strategy - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adaptively learning method and apparatus for improving a write strategy for discs of the same type produced by the same manufacturer. <P>SOLUTION: When a write action is completed, the previous written data is reproduced for checking the write quality of the written data. If the write quality does not comply with requirements, the write strategy is tuned, and the new write strategy is recorded in a memory for the use of a next write action. In this way, the write quality of the present write action is better than that of the previous write action so as to maintain the write quality. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an adaptive learning method and apparatus for improving the writing method, and more particularly to an adaptive learning method and apparatus for improving the writing method of an optical disc of the same type manufactured by the same manufacturer. It is about.

  In general, all relevant data is immediately written to the optical disc by the optical disc drive so as to complete the write operation in response to a write command issued by the host. During the writing operation process, the data is encoded by the control element of the optical disk drive device. For example, CD data is encoded into an 8/14 modulation signal and DVD data is encoded into an 8/16 modulation signal by the control element. The 8/14 or 8/16 modulation signal represents above the lands and pits formed on the track of the optical disc, and the resulting land and pit recording length must be between 3T and 11T.

  During the writing operation, a type of structure called “pit” is formed on the track of the optical disc when the relatively high power laser light emitted by the optical disc drive device is focused on the track, and is called “land”. Another type of structure called is formed on the track of the optical disc when the relatively low power laser light emitted by the optical disc drive is focused on the track. Further, a writing method is referred to by the optical disk drive device in order to determine a laser diode drive signal for selectively forming a land structure and a pit structure on the optical disk. The writing method is generally determined by the specifications of the optical disk drive device.

  FIG. 1a shows an example of a writing method for writing to a CD-R, and FIG. 1b shows an example of another writing method for writing to a CD-RW. Different types of optical discs have different dye materials that function as data recording layers, so different writing methods are applied depending on the type of optical disc in order to form similar structures including lands 15, pits 10 and pits 20. It is preferable to do. For example, according to the CD-R writing method, the pit structure can be formed on the CD-R by a laser diode driven by a single pulse having an amplitude PW (write power). On the other hand, according to the CD-RW writing method, a pit structure can be formed on the CD-RW by a laser diode driven by a plurality of pulses having an amplitude PW or PB (bias power). Furthermore, according to the CD-RW writing method, the land structure can be formed on the CD-RW by a laser diode driven by a single pulse having an amplitude PE (erasing power).

  Even for the same type of optical disc, the dye material varies depending on the disc manufacturer. Therefore, the writing method is also different. Therefore, before a new optical disk drive device is commercialized, a series of tests must be performed on different types of optical disks manufactured by different manufacturers, and a method of writing on these tested optical disks Is recorded in the memory of the optical disk drive.

  For example, a writing method proposed by a certain CD-R specification is defined as a CD-R standard writing method. For CD-Rs manufactured by other manufacturers, write to this standard writing method by adjusting one or more parameters such as power, pulse start position, pulse end position and / or pulse width. It is necessary to change the method. Thus, the writing method for CD-Rs manufactured by different manufacturers is positioned in accordance with the standard writing method for recorded CD-Rs. Similar changes can be applied to other types of optical discs such as DVD + R, DVD + RW, DVD-R, DVD-RW, CD-R and CD-RW.

  When an optical disk is loaded into the optical disk drive device, the type of the loaded optical disk is first determined by the optical disk drive device, and then the manufacturer of the loaded optical disk refers to the data track of the loaded optical disk Is determined by After the type and manufacturer of the loaded optical disk are determined, the specific writing method for the loaded optical disk is read from the memory by the control element of the optical disk drive device, and then the predetermined land and pit structure is According to the specific method, it is formed on the track of the optical disc.

  Unfortunately, due to the limited capacity of the memory, it is not possible to record the writing method of all different types of optical disks manufactured by different manufacturers in the memory of the optical disk drive device. Generally, only the writing method of an optical disk manufactured by a large and famous manufacturer is recorded in the memory. A standard writing method is applied to a method for writing an optical disc that is not recorded in the memory. Therefore, when an optical disc is loaded into the optical disc drive device, the type of the loaded optical disc is first determined by the optical disc drive device, and then the manufacturer of the loaded optical disc determines the data track of the loaded optical disc. Determined by reference. If there is no specific writing method for the optical disk loaded in the memory, the standard writing method recorded in the memory is used by the optical disk drive device to write to the loaded optical disk. For example, the standard DVD + R writing method is used for writing a loaded optical disc in which the corresponding writing method is not recorded in the memory. Although the write operation can be completed by standard write methods, the resulting write quality may be unsatisfactory. For example, if the access failure rate is high, it means that data written to the optical disk may not be successfully accessed by the optical disk drive device.

  When a user wants to use a specific brand of optical disc, an optimal writing method is important. A user may obtain tens or hundreds of discs at the same time. If the writing method for that type of optical disk is not recorded in the memory of the optical disk drive device, and the standard writing method is always used for the writing operation for all tens or hundreds of disks, the user Will suffer from the poor write quality of all these discs.

  FIG. 2 shows a flowchart of a writing quality improving method according to a conventional example. In US Pat. No. 6,636,468, in order to set the power of the laser (step 420), the optical disk drive apparatus performs OPC (Optimum Power Control) calibration (step 415). Data writing is started (this time is recorded as the start point) (step 425).

  While data is being written to the optical disc (step 427), if the trigger sends a signal to re-evaluate the laser power (this point is recorded as a stop point) (step 430), the optical disc drive The device stops writing and the data written by the optical disk drive is read and checked (step 440). If the write quality of the written data does not satisfy the requirement, it is necessary to adjust the laser power of the optical disk drive device, and a new laser power is determined according to the write quality of the written data (step 445 and step 455). On the other hand, when the writing quality of the written data is sufficient, it is not necessary to adjust the laser power (step 445). Thereafter, the optical disc drive finds the starting point (step 450) and the data is written to the optical disc with the original or adjusted laser power (step 425).

  According to the above prior art, the optical disc drive apparatus reevaluates the laser power during execution of the writing operation. Therefore, even if the writing quality of the written data is sufficient, a new writing operation is necessary from the start point, that is, the optical head has to move to return to the previous track. This process delays the write operation. Furthermore, complicated control is required in order to ensure that the written data is continuous. Further, since the write conditions are improved during the write operation, a complicated circuit configuration is required to determine whether or not the laser power needs to be re-evaluated. Otherwise, the entire laser power adjustment process must be performed once again when another optical disc of the same type manufactured by the same manufacturer as the previous disc is loaded.

  Therefore, the present invention provides an adaptive learning method to improve the writing method, and the improved writing method is used directly on the next loaded optical disc of the same type manufactured by the same manufacturer. be able to.

  According to one embodiment of the present invention, an adaptive learning method for improving a writing method used in an optical disk drive device for writing to a specific type of optical disk manufactured by a specific manufacturer is a memory. Performing a write operation for obtaining write data according to the first write method recorded in the step, detecting a write quality of the write data after the write operation is completed, and writing the write data Determining whether the first writing method needs to be adjusted according to quality; and when the writing quality of the writing data does not satisfy a preset criterion, Adjusting the first writing method to cause the second writing method to And a step of recording the memory.

  In one embodiment, the second writing method replaces the first writing method to be recorded in the memory and performs a next writing operation on a specific type of optical disc manufactured by the specific manufacturer. Used to execute.

  In one embodiment, the method of learning while adapting includes performing another write operation to obtain other write data according to the second write method recorded in the memory; and Detecting the write quality of the other write data after completion of determining the second write method according to the write quality of the other write data; and When the write quality of the write data does not satisfy the preset criterion, the second write method is adjusted to generate a third write method, and the third write method is changed to the memory. The method further includes recording.

  For example, the write operation is a TAO (Track At Once) write operation, an SAO (Session At Once) write operation, a DAO (Disc At Once) write operation, or a package write write operation.

  For example, the first writing method can be adjusted by adjusting parameters of laser power, pulse start point, pulse end point or pulse width. The laser power may include a write power, an erase power, and / or a bias power.

  In one embodiment, the memory is a non-volatile memory.

  For example, the predetermined criterion may be a predetermined access failure rate.

  In one embodiment, the first writing method is a preset writing method recorded in the memory for writing on an unconfirmed optical disc. Alternatively, the first writing method is a preset writing method recorded in the memory for writing on a specific type of optical disk manufactured by the specific manufacturer.

  The above description of the present invention will be readily understood by those having ordinary skill in the art upon review of the following detailed description and accompanying drawings.

FIG. 1 a is a schematic diagram illustrating an example of a CD-R writing method.

FIG. 1 b is a schematic diagram illustrating another example of a CD-RW writing method.

FIG. 2 is a flowchart of a method for improving the writing method according to the conventional example.

FIG. 3 is a flowchart of a method of learning while adapting to improve the writing method according to the present invention.

  FIG. 3 shows a flowchart of a method of learning while adapting to improve the writing method according to the present invention. When an optical disc is loaded into the optical disc drive device for writing data (step 510), the type and manufacturer of the optical disc are first determined by the optical disc drive device and then executed by the optical disc drive device. For this purpose, the first writing method for the loaded optical disc is retrieved from the memory (step 515). Next, in order to set the laser power, OPC calibration is executed by the optical disk drive device, and data is written to the optical disk with the laser power according to the first writing method (step 520). After the data is completely written on the optical disc (step 525), the optical disc drive device reads the previous write data and checks the write quality (step 530). Then, it is determined by the optical disk drive whether or not the writing method needs to be adjusted according to the writing quality of the writing data (step 535). If it is determined that the writing quality is excellent, there is no need to adjust the writing method, so the first writing method should be used as a standard for writing on this type of optical disc manufactured by the same manufacturer. (Step 550). Conversely, if it is determined that the write quality is insufficient, eg, does not meet a predetermined criterion, the write method needs to be adjusted according to the write quality (step 540). The adjusted writing method is recorded in memory to replace the first writing method (step 545) and is used as a standard for writing to this type of optical disc manufactured by the same manufacturer.

  In step 540 of adjusting the writing method according to the writing quality of the previous writing data, a plurality of writing parameters can be adjusted in addition to the laser power. For example, if the length of the read pit or land, for example 4.2T, is longer than the required length, for example 4T, it means that the pulse width recorded in the writing method needs to be shortened. ing. Further, other parameters recorded in the writing method, for example, the start point and end point of the pulse may be checked and adjusted as necessary.

  The write operation defined in the present invention may be a TAO (Track At Once) write operation, an SAO (Session At Once) write operation, a DAO (Disc At Once) write operation, or a package write write operation.

  In one embodiment, the first writing method may be a preset writing method recorded in the memory for writing to an unconfirmed optical disc. After the improved writing method is obtained according to the adaptive learning method according to the present invention and recorded in the memory of the optical disk drive device, the same type of optical disc manufactured by the same manufacturer loaded next is Written under better writing method. Therefore, the writing quality can be improved without delaying the writing operation as in the conventional example. Further, the first writing method may be a writing method already recorded in the memory in order to write to the optical disk on the road. According to the adaptive learning method of the present invention, the writing method can be improved by replacing the existing writing method with an adjusted writing method. Of course, the writing method can be further improved by replacing the second writing method with the third writing method by repeating the method of learning while adapting to other optical discs.

  In summary, the present invention provides a method of learning while adapting to improve the writing method, which improves the writing method without stopping and restarting the writing operation. Can be used directly on optical discs of the same type produced by the manufacturer.

  The method of learning while adapting according to the present invention can be implemented in a control element. The control element reads the first writing method from the memory, records the new writing method in the memory, and controls the optical head according to the original or new writing method.

  Although the present invention has been described in what is considered to be the most realistic and preferred embodiment at the present time, it will be understood that the invention is not limited to the described embodiment. On the contrary, it is intended to cover various modifications and similar arrangements that fall within the spirit and scope of the appended claims, and is the broadest to encompass all such modifications and similar structures. Should be interpreted.

Claims (10)

An adaptive learning method used in an optical disk drive device to write on a specific type of optical disk manufactured by a specific manufacturer, comprising:
Performing a write operation to obtain write data according to a first write method recorded in a memory;
Detecting the write quality of the write data after the write operation is completed;
Determining whether it is necessary to adjust the first writing method according to the writing quality of the writing data;
When the write quality of the write data does not satisfy a predetermined criterion, the first write method is adjusted to generate a second write method, and the second write method is stored in the memory. A method comprising the step of recording.   The second writing method replaces the first writing method to be recorded in the memory and is used to perform the next writing operation of a specific type of optical disc manufactured by the specific manufacturer. The method of claim 1, wherein: Performing another write operation to obtain other write data according to the second write method recorded in the memory;
Detecting the write quality of the other write data after the other write operation is completed;
Determining whether it is necessary to adjust the second writing method according to the writing quality of the other writing data;
When the write quality of the write data does not satisfy the preset criterion, the second write method is adjusted to generate a third write method, and the third write method is changed to the memory. The method of claim 1, further comprising the step of recording.   The method according to claim 1, wherein the write operation is a track at once (TAO) write operation, a session at once (SAO) write operation, a disc at once (DAO) write operation, or a package write write operation. .   The method of claim 1, wherein the first writing method is adjusted by adjusting parameters of laser power, pulse start point, pulse end point or pulse width.   The method of claim 1, wherein the laser power includes a write power, an erase power, and / or a bias power.   The method of claim 1, wherein the memory is a non-volatile memory.   The method according to claim 1, wherein the predetermined criterion is a predetermined access failure rate.   2. The method according to claim 1, wherein the first writing method is a preset writing method recorded in the memory for writing on an unconfirmed optical disc.   2. The first writing method according to claim 1, wherein the first writing method is a preset writing method recorded in the memory for writing on a specific type of optical disk manufactured by the specific manufacturer. The method described.

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