JP2005078742A - Recording condition learning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording condition learning device which is capable of shortening the time of recording condition learning operation based on self-recording and reproducing by trusting disk information of a manufacturer to adopt recording condition values as they are in the case that optical disks of the manufacturer does not have any trouble actually by adoption of nominal values. <P>SOLUTION: Keys for collation of disk information identifying manufacturer are preliminarily stored for a plurality of manufacturers in a database 22 for collation. When a value of reproduced disk information coincides with a key for collation, a manufacturer of an optical disk is estimated from the key for collation, and recording condition set values of disk information of the estimated manufacturer are utilized as they are. In the case that optimum values acquired and stored by self-recording and reproducing are stored in the database 22 for collation, the optimum values are utilized as set data. Therefore, recording condition learning operation of general self-recording and reproducing is omitted. Thus the problem is resolved that information of disk information cannot be used for optical disks of all manufacturers because disk information has the same contents per manufacturing lot of optical disks. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recording condition learning device, particularly when determining the recording condition of a recordable optical disc, reading the disc information recording the nominal recording condition of the optical disc, and determining it as a reliable recording condition if it is a known value, The present invention relates to a recording condition learning device that sets the value as it is as a recording condition and omits a recording condition learning operation for performing general self-recording and reproduction.

  FIG. 4 is a block diagram showing an example of a general recordable optical disk apparatus to which the present invention is applied. In the figure, the recordable optical disc apparatus has a recordable optical disc 1, a spindle motor 2 that rotates the optical disc 1, an optical pickup (PU) 3, and drivers 4 and 5 that drive them. The recordable optical disk apparatus has an HF (High Frequency) system to which a signal read from the optical disk 1 by the optical pickup 3 is input, and a servo system.

  The HF system performs binarization, demodulation, decoding, error correction, etc. on the read signal, and outputs the recording data to the optical pickup 3 at the time of recording, and records the recording data on the optical disc 1 For example, a recording signal processing unit 8, an RF signal processing unit 7, a drive controller 9 connected between the recording signal processing unit 8 and the host interface. On the other hand, the servo system includes a servo processing unit 10 that applies focus servo or tracking servo from a focus error signal or tracking error signal from the optical disc 1. The drive controller 9 is controlled by the microprocessor 11.

  In the above recordable optical disc apparatus, when data is recorded on the recordable optical disc 1, it is necessary to set in advance a number of recording conditions such as recording power, erasing power, and recording timing. However, since the optical disc 1 has various inherent variations, the set value has an optimum value for each disc. If recording is performed with a set value of one kind of combination, the discrepancy from the optimum value unique to the disc. As a result, problems such as an increase in data error may occur due to deterioration of the read signal.

  For this reason, generally, before the data is formally recorded on the optical disc 1, the optimum value of the recording condition specific to the disc is obtained and recording is performed under the obtained recording condition. This is called recording condition learning here. Specifically, there is known a disk recording condition learning device that measures the degree of modulation by an optical disk determined as a reference and sets an optimum power for each drive (see, for example, Patent Document 1).

  Conventionally, the recording condition learning operation is also performed by the recording condition learning apparatus of the block diagram shown in FIG. In the figure, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 5, the learning parameters are two items of recording power and recording timing. In FIG. 5, the optical power control unit 16 obtains the recording power setting value from the recording condition learning control unit 14, generates the recording optical power, and transmits the optical beam with the recording optical power through the laser driver 17 and the optical pickup 3. 1 is irradiated. In addition, the timing control unit 15 obtains a recording timing set value from the recording condition learning control unit 14, generates a predetermined recording waveform, and records data on the optical disc 1 with the above light beam through the laser driver 17 and the optical pickup 3. To do.

  The data signal recorded on the optical disk 1 by these is also reproduced by the optical pickup 3 and supplied to the jitter signal processing unit 12 and the envelope signal processing unit 13 through the head amplifier 6, and the signal jitter is jittered by the jitter signal processing unit 12. The envelope is detected as a value, and the envelope signal processor 13 detects the degree of modulation.

  These overall controls are handled by the recording condition learning control unit 14. The recording condition learning control unit 14 receives the jitter data from the jitter signal processing unit 12 and the envelope data from the envelope signal processing unit 13 as inputs, controls the recording power stepwise, and records when the modulation degree is optimum. The result is obtained by using the power as the optimum recording power, and the recording timing is controlled step by step, and the result is obtained by using the recording timing when the jitter is optimum as the optimum recording timing. The recording condition learning control unit 14 sends these results as a formal recording condition value to a recording control unit (not shown), which is used at the time of recording as a future recording condition. The above is a general recording condition learning operation. Thereafter, the same recording condition learning operation is performed for various setting values such as erasing power.

JP 2002-358644 A

  However, as described above, the conventional recording condition learning device that calculates the optimum recording condition by performing self-recording / reproducing can obtain the result of recording / reproducing by the recording type optical disc device (recorder) itself, and therefore the future recording operation The most appropriate setting value can be obtained, but it takes time to record and reproduce by itself only by obtaining one recording condition, and since there are many recording condition setting values, all optimum recording conditions There is a problem that it takes a very long time to calculate.

  In order to shorten the learning time, it is effective to use existing information. In general, the basic information of the disc called disc information preformatted in a wobble groove or the like is recorded on the optical disc. This disc information is recorded with optical disc attributes (size, rewritable, etc.), recording characteristics (optimal recording power, recording timing, etc.), playback characteristics, etc., and the recorder (optical disc device) first reads this information. It is designed to be used as basic information for optical discs.

  However, the content of the disc information is the same for each optical disc production lot, and is not information optimized for each optical disc as described above, but the set value can be said to be a nominal value. Therefore, the information of the disc information cannot be used as it is for the optical discs of all manufacturers.

  If reliable disc information is found, the value is trusted, or even if the optimum recording conditions for the recorder itself are stored in advance and the value is used, the general disc information format includes the manufacturer name. Since there is no such thing as whether it is possible to judge whether or not it is reliable with one identification code, it is necessary to collate a plurality of values in the disc information to estimate reliable disc information.

  The present invention has been made in view of the above points, and in the case of a manufacturer that has no practical problem even if the nominal value is adopted, the disc information is used as it is and the recording condition value is adopted as it is. An object of the present invention is to provide a recording condition learning device capable of shortening the recording condition learning operation time.

  In order to achieve the above object, the present invention provides a recording condition learning apparatus for learning a recording condition for setting a recording condition suitable for a recording medium. A collation in which at least a collation key is stored among setting data consisting of reading means for reading from a recording medium, a collation key indicating the value of basic information for each medium maker, and various recording condition information obtained by recording and reproduction Compare the basic database, the basic information from the reading means, and the verification key read from the verification database, and if they match, use the matched basic information as is or use the matching basic information from the verification database Recording condition setting means for reading setting data corresponding to the key and setting it as a recording condition of the recording medium, and performing recording and reproduction It is obtained by omitted from conditions learning operation.

  In the present invention, attention is paid to the fact that variations in basic information indicating recording condition values recorded in advance in the production lot of the recording medium are very small. By relying on the basic information and adopting the basic information as it is, the recording condition learning operation is omitted and the time is shortened.

  Therefore, in the present invention, a list of verification keys corresponding to basic information for each manufacturer that can be trusted on the recorder side is prepared in advance, and if there is a verification key corresponding to the basic information read from the recording medium, It is determined that the basic information of the manufacturer can be used, and the content of the basic information is adopted as it is, or a database of setting values that is most suitable for the recorder is provided, and the setting values in the database are adopted.

  Since the recording condition cannot be estimated if the manufacturer name of the basic information read from the recording medium is not in the list, the optimum recording condition value is obtained by performing a recording condition learning operation by normal self-recording / reproducing. As a result, the recording condition learning operation time is reduced under the actual usage conditions of the recorder, and the problem of making the user wait can be reduced overall. Here, when the recording medium is a recordable optical disk, the basic information recorded in advance on the recording medium is disk information.

  According to the present invention, by having a collation database that stores a collation key corresponding to basic information of a known manufacturer in advance, if there is a collation key corresponding to the basic information read from the recording medium, Since it is possible to omit self-recording / reproduction by simply determining the basic information of a reliable manufacturer and adopting the contents of the basic information as it is, conventional recording conditions learning by self-recording / reproduction for all recording media The overall learning time can be shortened compared to the apparatus.

  Further, according to the present invention, if there is an optimum value for the recorder itself, which is different from the collation key in the collation database, the optimum value is stored in a database of preset values stored in advance as the optimum data. Can be used to set more optimal recording conditions than basic information.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of a recording condition learning apparatus according to the present invention. In the figure, the same components as those in FIG. In FIG. 1, a drive controller 20 is provided on the output side of the head amplifier 6 via a DI read signal processing unit 19. The drive controller 20 includes a disc information memory 21, a collation database 22, a comparison calculation unit 23, and a setting extraction unit 24. The drive controller 20 receives a read signal of disc information (DI) preformatted on the optical disc 1 as an input, and performs collation. The recording condition setting value corresponding to the comparison result with the collation information stored in advance in the database 22 is supplied to the recording condition learning control unit 14.

  Next, the operation of the present embodiment will be described. First, the optical pickup 3 is moved to a predetermined area of the optical disc 1 and the disc information a preformatted in the disc manufacturing stage is read there. The reproduction signal of the optical pickup 3 is supplied to the DI read signal processing unit 19 through the head amplifier 6, where the disk information a is extracted from the reproduction signal, supplied to the disk information memory 21 in the drive controller 20 and stored therein. The

  The drive controller 20 stores collation information for estimating the manufacturer from the disc information in advance, and has a collation database 22 for storing the optimum recording condition setting value if necessary. The drive controller 20 sequentially collates the value of the disc information a read from the disc information memory 21 with the collation information read from the collation database 22 by the comparison operation unit 23. When the value of the disc information a matches the verification information, the comparison calculation unit 23 supplies the comparison match result to the setting extraction unit 24.

  When the comparison match result is input, the setting extraction unit 24 uses the recording condition setting value in the disc information at that time as it is, or if there is another optimum value in the collation database 22, the setting value is used. Use. When one of the set values is determined, the setting extraction unit 24 outputs the set value to the recording condition learning control unit 14 as a recording condition set value. The recording condition learning control unit 14 supplies the recording timing setting value generated by the input recording condition setting value to the timing control unit 15 to generate a predetermined recording waveform, and the recording generated by the input recording condition setting value. The power setting value is supplied to the optical power control unit 16 to generate the recording optical power, and these are supplied to the optical pickup 3 to modulate the light beam that emits the data with the setting recording optical power to the optical disc 1. Record. Thereafter, recording is performed under these recording conditions.

  If the comparison operation unit 23 sequentially collates and the value of the disc information a and the collation information do not match, the recording condition setting cannot be estimated, so the recording condition learning operation by self-recording / reproduction is performed as usual. To obtain the recording conditions.

  FIG. 2 shows a schematic configuration of the disc information and a schematic configuration of the verification database 22. As shown in FIG. 2 (A), the contents of the disc information include the disc attributes of the optical disc (RW when rewritable), version, recording power, erasing power, recording timing information, etc. The feature is that there is no item such as a manufacturer name for easily identifying the manufacturer.

  Therefore, in order to estimate the manufacturer name of the optical disk from these pieces of information of the disk information, when the values such as the recording power, the erasing power, and the recording timings 1 and 2 are used as key information, they match each other. It can be estimated as information. Therefore, in the collation database 22 of the present embodiment, as shown in FIG. 2B, a disc information collation key (recording power, erasing power, recording timing 1) for identifying one maker is shown for one maker. 2) is stored in advance for a plurality of manufacturers. If the disc information value matches the collation key, the disc manufacturer's disc information is estimated by estimating the optical disc manufacturer from the collation key. If the value is reliable (if it is known that the manufacturer has little variation in individual products at the time of manufacturing the apparatus), the recording condition setting value is used as it is.

  In addition, as shown in FIG. 2B, if the optimum value acquired and stored by, for example, self-recording / reproduction for the disc apparatus separately from the disc information is stored in the collation database separately from the collation key, The optimum value is used as setting data.

  If the input disc information value does not match the verification key of manufacturer # 1 in FIG. 2B, the comparison operation unit 23 of FIG. 1 compares the value of the verification key of the next manufacturer # 2. Go. If there is no matching key that matches all the matching keys in the matching database 22, it is determined as an optical disk of an unknown manufacturer.

  Next, the recording condition learning operation of FIG. 1 will be described in more detail with the operation flowchart of the drive controller of FIG. When the optical disc 1 is inserted into the apparatus, the drive controller 20 first moves the optical pickup 3 to a predetermined disc information area preformatted on the optical disc 1, and records the disc information (DI) a recorded therein. The contents are read (step S1).

  The contents of the read disk information a are stored in the disk information memory 21 of the drive controller 20 through the head amplifier 6 and the DI read signal processing unit 19 in FIG. 1 (step S2). Subsequently, the comparison operation unit 23 confirms whether or not the reading of the disk information verification keys for each manufacturer shown in FIG. 2 from the verification database 22 has been completed (step S3). The disc information collation key for each manufacturer shown in FIG. 2 read from the database 22 and the contents of the disc information memory 21 read from the disc information memory 21 are collated (step S4). The verification key) is updated to continue the verification (steps S5, S3, S4).

  If they match, the setting extraction unit 24 reads the setting value from the contents of the disc information at that time, or reads the setting data stored in the collation database 22 (step S6). Is transmitted to the recording condition learning control unit 14 (step S7), and the recording learning is terminated (step S9). If there is no collation key that matches the disc information in the collation database 22 (step S3), recording condition learning by normal self-recording reproduction is performed (step S8).

  If the disc information collation key for each manufacturer shown in FIG. 2 read from the collation database 22 and the content read from the disc information memory 21 match, the setting data corresponding to the matching collation key. If the disc information is recorded, the setting data is used without using the disc information contents as it is. The disc information data is the optimum condition in combination with the device measured by the disc manufacturer. This is because it is not a value obtained by a combination with a recorder (optical disk device) that reproduces 1 and may not be an optimum value.

  Therefore, for example, even if the recording power of the disc information of the optical disc of a known manufacturer is “4”, the optimum value of the recording power for the optical disc of the known manufacturer of the recorder (optical disc apparatus) to be reproduced is “5”. If it is known in advance before manufacturing the apparatus, the optimum value is stored in the collation database 22 in advance, so that the optimum recording power can be used without using the recording power of the disc information as it is. Is used.

  As described above, according to the present embodiment, when the recording condition of the recordable optical disk is obtained, the disk information a in which the nominal recording condition of the optical disk 1 is recorded is read, and if it is a known value, the reliable recording condition is obtained. Judgment and setting the value as the recording condition as it is, or when the setting data corresponding to the disc information is stored, the setting data is set as the recording condition and the recording condition learning operation for performing general self-recording / reproduction is performed. Since it is omitted, the learning time can be shortened compared to the conventional case.

  Note that the present invention is not limited to the above-described embodiment, and the present invention can be applied to a recording medium in which basic information is recorded in advance even in a recording medium other than an optical disk. Further, in FIG. 2, it has been described that one verification key is stored in the verification database for each manufacturer. However, the present invention is not limited to this. Thus, there may be a plurality of types of verification keys.

It is a block diagram of one embodiment of a recording condition learning apparatus of the present invention. It is a schematic diagram which shows the content of the disc information and the database for collation. It is a flowchart for operation | movement description of the principal part of the recording condition learning apparatus of this invention. 1 is a block diagram of an example of an optical disc apparatus to which the present invention can be applied. It is a block diagram of an example of the conventional recording condition learning apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 3 Optical pick-up 14 Recording condition learning control part 15 Timing control part 16 Optical power control part 19 DI read signal processing part 20 Drive controller 21 Disc information memory 22 Database for collation 23 Comparison calculating part 24 Setting extraction part a Disc information

Claims (1)

In a recording condition learning apparatus for learning a recording condition for setting a recording condition suitable for a recording medium,
Reading means for reading basic information of the recording medium recorded in advance on the recording medium from the recording medium;
A collation key indicating the value of the basic information for each medium manufacturer, and a collation database in which at least the collation key is stored among setting data composed of various information of recording conditions obtained by recording and reproduction;
The basic information from the reading means is compared with the verification key read from the verification database, and when they match, the matched basic information is used as it is or matched from the verification database Recording condition learning means for reading out the setting data corresponding to the verification key and setting it as a recording condition of the recording medium, and omitting a recording condition learning operation for performing self-recording / reproducing apparatus.

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