JP2004348903A - Method for determining optical disk, method for playing optical disk, and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a playing operation for each optical disk by increasing an optical disk determining efficiency. <P>SOLUTION: A logical sector number LSN16 is read in ST3. When the displaying of a predetermined standard identifier is determined in ST4, the process proceeds to ST5 where the basic volume descriptor of a volume recognition row is read. In ST6, the recording position information of a path table in which description regarding a directory hierarchical layer is obtained from the basic volume descriptor. When a path table reading request is made in ST9, path table reading is executed in ST10. When the read information contains the directory identifier of video or voice, the optical disk of a type in which the video or the voice is recorded is determined in ST12. When no directory identifier of video or voice is contained, it is determined in ST13 that a disk is not the optical disk of a type in which video or voice is recorded. Based on the determining result of the optical disk, the playing operation of the optical disk is controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical disk discriminating method, an optical disk reproducing method, and an optical disk device. More specifically, the first information in which the description about the volume space in the volume recognition sequence is made is read from the optical disc, and the recording position information of the second information in which the description about the directory hierarchy is made is obtained. The discrimination of the optical disc is performed based on whether or not the second information read based on the information includes a predetermined directory identifier, and the reproducing operation of the optical disc is controlled according to the discrimination result.
[0002]
[Prior art]
2. Description of the Related Art In recent years, along with advances in optical disk technology, there have been provided optical disks having the same physical specifications and different recorded signal contents. For example, various types of compact discs include not only a CD-DA on which music data is recorded, but also a CD-ROM on which computer data and the like are recorded, and a video CD (Compact Disc) on which video (moving images) and audio are recorded. An optical disk is provided. Further, in an optical disk called a DVD (Digital Versatile Disc) having a higher recording density and a larger recording capacity than a compact disk, a DVD-ROM in which computer data is recorded, a DVD-ROM in which video and audio such as a movie are recorded, and the like. Video and the like are provided. For this reason, the optical disk device is designed to reproduce a plurality of optical disks of different types.
[0003]
Here, when the recorded signal is, for example, computer data, it is desirable to be able to read the recorded data as quickly and correctly as possible. Also, when the recorded signal is video or audio data, it is sufficient to read the data so that the video and audio are not interrupted. Is desirable. For this reason, what kind of signal is recorded on an optical disk is determined by a method as shown in Patent Document 1, and the reproduction operation of the optical disk is controlled according to the determination result.
[0004]
[Patent Document 1]
International Publication WO01 / 54123A1 pamphlet
[0005]
[Problems to be solved by the invention]
By the way, the method disclosed in Patent Document 1 reads out data at a predetermined position on an optical disc, for example, LSN (Logical Sector Number) "257", and generates a character string that can determine that video data is recorded. Whether the disc is a disc on which computer data is recorded or a disc on which video and audio are recorded is determined depending on whether the disc is included in the "Path Table".
[0006]
On the other hand, with the spread of writable and rewritable optical disks, users of optical disks edit video and audio data using authoring software, and record the edited data on the optical disk. When the user writes the data using the authoring software, the data of the “Path Table” may be recorded at a position different from the LSN “257” depending on the software. In such a case, even if the data is read from the predetermined position as described above, the data of the “Path Table” cannot be obtained.
[0007]
Therefore, the present invention provides an optical disc discriminating method, an optical disc reproducing method, and an optical disc apparatus that can perform a discrimination operation according to each optical disc by increasing the discriminating ability of the optical disc.
[0008]
[Means for Solving the Problems]
An optical disc discrimination method according to the present invention reads out, from an optical disc, first information describing a volume space in a volume recognition sequence, and acquires recording position information of second information describing a directory hierarchy. A step of reading out the second information based on the recording position information, and a step of determining the optical disk based on whether or not the second information includes a predetermined directory identifier. Have
[0009]
Also, the optical disk reproducing method according to the present invention reads out the first information describing the volume space in the volume recognition sequence from the optical disk and records the recording position information of the second information describing the directory hierarchy. And reading the second information based on the recording position information, and discriminating the optical disk based on whether the read second information includes a predetermined directory identifier. And controlling the reproduction operation of the optical disc according to the discrimination result of the optical disc.
[0010]
Also, an optical disk reproducing apparatus according to the present invention includes a reading unit that reads information recorded on an optical disk, and a control unit that controls the reading unit, and describes a volume space in a volume recognition sequence from the optical disk. 1 is read, and the recording position information of the second information in which the description about the directory hierarchy is made is obtained. A predetermined directory identifier is added to the second information read based on the recording position information. Control means for determining the optical disk based on whether or not the optical disk is included, and performing operation control according to the determination result.
[0011]
In the present invention, the first information (for example, the basic volume descriptor) in which the description about the volume space in the volume recognition sequence is read from the optical disc, and the second information (in which the description about the directory hierarchy is made) ( For example, recording position information of a path table is obtained. Based on this recording position information, the discrimination of the optical disc is performed based on whether or not the read second information includes a predetermined directory identifier (for example, a video and / or audio directory identifier). Further, the read speed of information from the optical disk and the response process when information recorded on the optical disk cannot be read are switched according to the determination result of the optical disk. Further, when it is determined that the optical disk is a format in which video and / or audio is recorded, a reproducing operation having different power consumption, for example, a rotation driving method of the optical disk can be switched.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the optical disk device 20. The optical disc 10 is controlled at a predetermined rotation speed by a spindle motor 22 driven by a spindle motor drive unit 21 constituting a reading unit. The reading means includes a spindle motor driving unit 21 and a spindle motor 22, and an optical pickup 30, an RF amplifier 31, a signal processing unit 32, a servo processing unit 33, a driver 38, a feed driving unit 39 and a feed motor 40, which will be described later. Is done.
[0013]
The optical disk 10 is irradiated with a light beam whose light amount is controlled from the optical pickup 30 of the optical disk device 20 so that the optical beam is focused on the optical disk 10. The light beam reflected by the optical disk 10 is applied to a light detection unit (not shown) of the optical pickup 30. The photodetector performs photoelectric conversion and current-voltage conversion based on the reflected light beam, generates a voltage signal having a signal level corresponding to the amount of light of the reflected light beam, and supplies the voltage signal to the RF amplifier 31.
[0014]
The RF amplifier 31 generates a read signal SRF, a tracking error signal STE, and a focus error signal SFE using a voltage signal from the optical pickup. In addition, the generated read signal SRF is supplied to the signal processing unit 32, and the tracking error signal STE and the focus error signal SFE are supplied to the servo processing unit 33.
[0015]
The signal processing unit 32 performs EFM (Eight to Fourteen Modulation) demodulation and error correction on the readout signal SRF, and extracts information AR for determining the address position or the like irradiated with the light beam from the obtained information. It is supplied to a control unit 50 as a control means. For example, information on ATIP (Absolute Time In Pre-Groove) recorded according to the type of optical disc, information on LPP (Land Pre-Pit) indicated by pits arranged in a land area, address information on wobbles Is extracted and supplied to the control unit 50.
[0016]
The signal processing unit 32 is connected to a memory unit 34 such as a DRAM (Dynamic Random Access Memory). The memory unit 34 performs EFM demodulation and error correction. The memory unit 34 can also be used as a cache for the reproduction data RD output from the host interface 35 and the recording data WD supplied to the host interface 35.
[0017]
The recording data WD supplied from the host interface 35 is supplied to the signal modulator 36. The signal modulation unit 36 performs EFM modulation of the supplied recording data WD to generate a modulation signal MW, and supplies the modulation signal MW to the light beam modulation unit 37. The light beam modulator 37 drives a semiconductor laser (not shown) of the optical pickup 30 based on the modulation signal MW, and controls the output of the light beam output from the optical pickup 30 based on the modulation signal MW. Thus, the recording data is recorded on the optical disk 10.
[0018]
Based on the supplied focus error signal SFE, the servo processing unit 33 controls a focus control signal SFC for controlling an objective lens (not shown) of the optical pickup 30 so that the focus position of the laser light is on the recording layer of the optical disk 10. Is generated and supplied to the driver 38. Further, a tracking control signal STC for controlling the objective lens of the optical pickup 30 is generated based on the supplied tracking error signal STE so that the irradiation position of the light beam is at the center of the desired track, and the tracking control signal STC is supplied to the driver 38. I do. Further, the servo processing unit 33 generates a feed control signal SSC for moving the optical pickup 30 in the radial direction of the optical disc 10 so that the irradiation position of the laser beam does not exceed the tracking control range, and sends the feed control signal SSC to the feed drive unit 39. Supply. Further, the servo processing unit 33 generates a drive signal SSP based on the synchronization signal DSY output from the signal processing unit 32 so that the rotation speed of the optical disc 10 becomes a desired speed, and supplies the drive signal SSP to the spindle motor drive unit 21. I do.
[0019]
The feed drive unit 39 drives the feed motor 40 based on the feed control signal SSC to move the optical pickup 30 in the radial direction of the optical disc 10. The feed drive unit 39 is supplied with a feed control signal SSE from the control unit 50. The feed control signal SSE drives the feed motor 40 when the operation of the optical disc apparatus 20 starts and ends, and the optical pickup 30 Is moved to a predetermined position.
[0020]
The control unit 50 communicates with an external device (not shown) such as a computer device via the host interface 35, and outputs a control signal CS for controlling the operation of the optical disc device 20 according to a command from the external device. It is generated and supplied to the signal processing unit 32 and the servo processing unit 33.
[0021]
Here, at the time of data recording, the irradiation position of the light beam is set to a desired position using the information AR supplied from the signal processing unit 32, and the output of the light beam is set to the recording power. At this time, the output of the light beam is modulated according to the recording data WD as described above. The recording layer of the optical disk 10 is made of a substance whose crystal structure changes when heated by light beam irradiation, and pits are formed by the change in the crystal structure due to heating. Further, since the output of the light beam is modulated in accordance with the recording data WD, the presence or absence of pits and the length of the pits correspond to the recording data WD. That is, pits corresponding to the recording data WD are formed. At the time of data erasing, the light beam output position is set to the erasing power as the light beam irradiation position as the data recording position of the data to be erased. At this time, in the portion irradiated with the light beam, the crystal state changed at the time of data recording returns to the original state, the pits disappear, and the data is erased. At the time of data reproduction, the irradiation position of the light beam is set to a desired data read position, and the output of the light beam is set to reproduction power. The reproducing power is set to a level at which no change in the crystal structure occurs even when the light beam is irradiated. Here, when the optical beam having the reproducing power is applied to the optical disk 10, the amount of reflected light from the optical disk 10 changes according to the pit formation state. Therefore, the reproduction data RD can be generated using the reflected light.
[0022]
FIG. 2 shows a part of the format configuration of an optical disc, for example, a DVD. The vertical direction is the system layer, and the horizontal direction is the DVD family. In the system layer, a file system layer is provided above the physical layer, and an application layer is provided above the file system layer.
[0023]
The physical layer defines a sector format, an error correction method, a modulation method, and the like of the optical disk. Although the basic signal recording format is unified within the family, in reality, recording and reproduction and reproduction only are not completely the same, and have a specific structure according to the function. That is, for recording, there is a recording layer for recording information, and a recording track is generated in advance, and an address for setting a recording timing is recorded in advance. However, the system is fully compatible.
[0024]
The file system layer is DVD-Video / DVD-Audio / DVD-ROM / DVD-R, and employs a UDF (Universal Disc Format) bridge format. UDF is a standard of ISO (International Organization for Standardization) that includes both recording and reproduction. The UDF bridge describes both a subset extracted mainly from a UDF reproduction part and ISO 9660.
[0025]
The UDF bridge is adopted so that compatibility can be ensured because the conventional CD-ROM employs ISO9660 as a file system layer. An application layer for recording a movie or the like is defined above these file system layers.
[0026]
DVDs have such a unified format structure, and therefore have excellent compatibility for video, music, and computers. For example, a DVD-Video disc can be reproduced not only by a DVD player but also by a DVD-ROM drive of a computer peripheral device, so that a movie can be viewed on a personal computer.
[0027]
FIG. 3 illustrates the volume structure of the UDF bridge. LSNs (Logical Sector Numbers: logical sector numbers) 0 to 15, LSNs 21 to 31, and LSNs 66 to 255 in the data area of the optical disk 10 are reserved areas. The LSNs 16 to 20 are “UDF Bridge Volume Recognition Sequence (VSR): Volume Recognition Sequence” of the UDF bridge, LSN 16 is “Primary Volume Descriptor: Basic Volume Descriptor”, and LSN 17 is “Volume Descriptor Set: Volume Descriptor: Terminator ", LSN 18 is" Beginning Extended Area Descriptor: Extended Area Descriptor ", LSN 19 is" NSR Descriptor: NSR descriptor ", and LSN 20 is" Terminating Extended Area Descriptor: Extended Area Descriptor. "
[0028]
The “Primary Volume Descriptor” of the LSN 16 is a basic volume descriptor of a CD-ROM standardized by ISO9660, and describes a volume space. The “Volume Descriptor Set Terminator” of the LSN 17 indicates the end of the “Primary Volume Descriptor”. “Beginning Extended Area Descriptor” of the LSN 18 is a descriptor indicating the start of the extension area. Also, the “NSR Descriptor” of the LSN 19 is provided with a descriptor indicated by the standard of ISO / IEC (International Electrotechnical Commission) 1344. The “Terminating Extended Area Descriptor” of the LSN 20 is a descriptor indicating the end of the extension area.
[0029]
The LSNs 32 to 47 are “Main Volume Descriptor Sequence: Main Volume Descriptor Sequence”, and the LSN 32 is “Primary Volume Descriptor: Basic Volume Descriptor: LSN 33” in UDF (Universal Disk Format) standard. Processing System Volume Descriptor ", LSN 34 is" Partition Descriptor: Partition Descriptor ", LSN 35 is" Logical Volume Descriptor: Logical Volume Descriptor ", LSN 36 is" Unallocated Space Descriptor: Unallocated Space Descriptor ", LSN 37 is Lmining Desc descriptor: terminal descriptor ". The LSNs 38 to 47 are "Trailing Logical Sector: subsequent logical sector".
[0030]
The LSNs 48 to 63 are “Reserve Volume Descriptor Sequence: spare volume descriptor sequence”, and the spare volume descriptor sequence is assumed to be equal to the main volume descriptor sequence, and the information of the main volume descriptor sequence cannot be read. Sometimes used as a backup.
[0031]
The “Logical Volume Integrity Descriptor: Logical Volume Integrity Descriptor” of the LSN 64 is a descriptor for managing various types of failure information generated in the logical volume, and the “Terminating Descriptor: Termination Descriptor” of the LSN 65 indicates the end of the descriptor. Is shown.
[0032]
The “Anchor Volume Descriptor Pointer: Start Volume Descriptor Pointer” of the LSN 256 indicates the position of the main volume descriptor sequence. The LSN 257 and later indicate the ISO9660 file structure such as “Path Table: path table” or “Root Directory: root directory” indicating the path to reach the target file. For example, the UDF file structure of the information standardized in the above, for example, “File Set Descriptor: file set descriptor” or “File Entry: file entry” is shown. The subsequent area is used as a UDF / ISO file storage area, in which computer data, video data, and the like are recorded. The last LSN is a second anchor point. This second anchor point is made equal to the anchor point of LSN 256, and is used as a backup because the anchor point of LSN 256 cannot be read. The UDF logical volume space is allocated from the position of the logical sector number p indicating the UDF file structure.
[0033]
FIG. 4 shows a part of the configuration of “Primary Volume Descriptor” in the bridge volume recognition sequence. The byte position BP (Byte Position) 0 of “Primary Volume Descriptor” is “Volume Descriptor Type: volume descriptor type”, and an 8-bit number indicating “Primary Volume Descriptor” is specified.
[0034]
The five bytes from BP1 are a standard identifier "Standard Identifier: standard descriptor", and for example, a character string "CD001" indicates that the standard corresponds to the ISO9660 standard. BP6 is “Volume Descriptor Version: Volume Descriptor Version”, and indicates the version number of “Primary Volume Descriptor”.
[0035]
BP7 is an unused area, and 32 bytes from BP8 are "System Identifier: system identifier". “System Identifier” is to specify the identification information of a system that can recognize and process the contents of the logical sectors from LSN0 to LSN15.
[0036]
"Volume Identifier: Volume identifier" of 32 bytes from the BP 40 indicates identification information of the volume, and 8 bytes from the BP 72 is an unused area. "Volume Space Size: Volume space size" of 8 bytes from the BP 80 indicates the number of logical sectors recorded in the volume space. The 32 bytes from the BP 88 are unused areas.
[0037]
Four bytes from BP 120 are “Volume Set Size: Volume set size”, and four bytes from BP 124 are “Volume Sequence Number: Volume sequence number”. For example, since a DVD playback-only disc has a single volume, Each becomes "1". Also, 4 bytes from BP128 are “Logical Block Size: size of logical block”.
[0038]
The “Path Table Size: Path Table Size” of 8 bytes from the BP 132 indicates the size of the path table in which the description about the directory hierarchy is made, and the “Location of Occurrence of Type L” of 4 bytes from the BP 140. “Path Table: position of L-type path table” is recording position information of the L-type path table, and indicates the first logical sector number allocated to an extent including the L-type path table. Further, "Location of Optional Occurrence of Type L Path Table: position of arbitrary L-shaped path table" for four bytes from BP 144 is recording position information of the arbitrary L-shaped path table, and is allocated to an extent including the arbitrary L-shaped path table. The first logical sector number assigned is shown. In the “Location of Occurrence of Type L Path Table” and “Location of Optional Occurrence of Type L Path Table”, a plurality of byte numbers in a record of the path table are expressed in little endian.
[0039]
"Location of Occurrence of Type M Path Table: position of M-type path table" for 4 bytes from BP 148 is recording position information of the M-type path table, and is the first logical sector allocated to an extent including the M-type path table. The number is indicated. Further, “Location of Optional Occurrence of Type M Path Table: the position of the arbitrary M-type path table” of 4 bytes from the BP 152 is the recording position information of the arbitrary M-type path table, and is allocated to the extent including the arbitrary M-type path table. The first logical sector number assigned is shown. In the “Location of Occurrence of Type M Path Table” and “Location of Optional Occurrence of Type M Path Table”, the numerical value of a plurality of bytes in the record of the path table is expressed in big endian (big).
[0040]
FIG. 5 shows the configuration of “Path Table Record: path table record” in the path table. RBP0 (RBP indicates the byte position in the record) is “Length of Directory Identifier (LEN_DI): length of directory identifier”, and specifies the number of bytes in the directory identifier column of “Path Table Record”. RBP1 is “Extended Attribute Record Length: length of extended attribute record”. The 4 bytes from RBP2 are "Location of Extent: Extent position", which specifies the logical block number of the first logical block allocated to the extent in which the directory is recorded. Two bytes from the RBP 6 are “Parent Directory Number: parent directory number”, which specifies a record number for the parent directory of the directory. The (LEN_DI) portion from the RBP 8 is “Directory Identifier: directory identifier”, which specifies identification information for the directory. The b bytes from RBPa (a = 8 + LEN_DI) are “Padding Field: embedded”, and are provided only when the directory identifier is an odd number.
[0041]
FIG. 6 shows the configuration of the application layer shown in FIG. 2. The video data is a directory of "VIDEO_TS", the audio data is a directory of "AUDIO_TS", and the computer data is computer data of a computer data different from video and audio. Stored in each directory. The directory having the extension “IFO” relates to reproduction control information. The extension “VOD” relates to video data, and the extension “AOD” relates to audio data. The extension "BUP" is for backup.
[0042]
Here, for example, a directory of “VIDEO_TS” always exists on an optical disc recorded in the DVD-Video format, and a directory identifier “VIDEO_TS” indicating a directory of video data is included in “Directory Identifier” of “Path Table Record”. Is set. For this reason, the optical disk device 20 reads from the optical disk 10 the “Primary Volume Descriptor” in which the description about the volume space is made, and acquires the recording position information of “Path Table” in which the description about the directory hierarchy is made. Further, “Path Table” is read out based on the recording position information, and the optical disc is determined based on whether or not a directory identifier indicating a directory of video or audio is included.
[0043]
FIG. 7 is a flowchart showing the optical disc determining operation. In step ST1, it is determined whether an external device connected via the host interface 35 has made a request to read a signal recorded on an optical disc. Here, when a read request is made, the process proceeds to step ST2. If the read request has not been made, the optical disc discriminating operation ends.
[0044]
In step ST2, it is determined whether or not the read request is for reading the LSN 16. The LSN 16 is a logical sector in which information describing the volume space in the volume recognition sequence is recorded as described above. If the LSN 16 is to be read, the process proceeds to step ST3. If the reading is not the LSN 16, the process proceeds to step ST8.
[0045]
In step ST3, the reading of the LSN 16 is performed, and the process proceeds to step ST4. In step ST4, it is determined whether or not “Standard Identifier” of BPs 1 to 5 indicates a predetermined standard identifier. Here, when a predetermined standard identifier is indicated, the process proceeds to step ST5. When the predetermined standard identifier is not included, the process proceeds to step ST7. For example, when the information obtained by reading the LSN 16 is as shown in FIG. 8, the “Standard Identifier” of BPs 1 to 5 is “43 44 30 30 31 (= CD001)”, which corresponds to the standard of ISO9660. The process proceeds to step ST5 because the identifier is a predetermined standard identifier indicating that the operation is performed. If the standard identifier is not the character string "CD001", the process proceeds to step ST7.
[0046]
In step ST5, it is determined that the read information of the LSN 16 is "Primary Volume Descriptor", and the process proceeds to step ST6. In step ST6, the recording position information of the path table is obtained from the read information, and the process proceeds to step ST8.
[0047]
In step ST7, since the read information of the LSN 16 does not include a predetermined standard identifier, it is assumed that the read information is not “Primary Volume Descriptor”. That is, it is determined that the recording position information of the path table cannot be obtained from the read information of the LSN 16 and the optical disc discriminating operation ends.
[0048]
In step ST8, it is determined whether or not the recording position information of the path table has been acquired. If the recording position information of the path table has been acquired, the process proceeds to step ST9. If the recording position information of the path table has not been obtained, the path table cannot be read, and the optical disc discrimination operation ends.
[0049]
In step ST9, it is determined whether or not a path table read request has been made. If the path table read request has been made, the process proceeds to step ST10, and if the path table read request has not been made for a predetermined time, the optical disc discrimination operation ends.
[0050]
In step ST10, the path table is read using the acquired recording position information, and the process proceeds to step ST11. Here, when the information obtained by reading the LSN 16 is as shown in FIG. 8, the “Location of Occurrence of Type L Path Table” of 4 bytes from the BP 140 is “01 01 00 00”. Since the path table indicated by the “Location of Occurrence of Type L Path Table” is in little endian notation, the address of the path table is “00000101”. The “Location of Occurrence of Type M Path Table” for 4 bytes from BP 148 is “00 00 01 02”. Since the path table indicated by “Location of Occurrence of Type M Path Table” is in the big endian notation, the address of the path table is “00000102”.
[0051]
In step ST11, it is determined whether or not the read path table information includes a predetermined directory identifier. If a predetermined directory identifier, for example, a directory identifier indicating a video or audio directory, is detected, the process proceeds to step ST12, where the optical disk is determined to be a format in which video and audio are recorded, and the optical disk determination operation ends. If a directory identifier indicating a directory of video or audio is not detected, the process proceeds to step ST13, where the optical disk is determined not to have a format in which video and audio are recorded, and the optical disk determination operation ends.
[0052]
Here, the path table is read in step ST10, and when the information of the path table read from the address “00000102” is that shown in FIG. 9, “Directory Identifier” indicating the directory identifier is the first record. And "56 49 44 45 4f 5f 54 53 (= VIDEO_TS)" in the second record. That is, since the directory identifier “VIDEO_TS” indicating the directory of the video is indicated, it is determined that the optical disk is a DVD-Video format optical disk. When only the directory identifier “AUDIO_TS” is detected, it is determined that the optical disk is a DVD-Audio format optical disk. Further, when the directory identifiers “VIDEO_TS” and “AUDIO_TS” are not detected, it is determined that the optical disk is not an optical disk of a format in which video and audio are recorded.
[0053]
As described above, the basic volume descriptor describing the volume space in the volume recognition sequence is read from the optical disc 10, and the recording position information of the path table in which the description related to the directory hierarchy is described is obtained. The optical disc is determined based on whether or not the path table read based on the information includes a directory identifier indicating that video or audio data is recorded. Here, since the information of the volume recognition sequence is always read information, the recording position of the path table can be determined even when an optical disc having a different recording position of the path table is used. That is, the optical disk can be identified by reading the path table, and the optical disk identification ability can be enhanced. In addition, the discrimination of the optical disk can be performed simultaneously when the information of the volume recognition sequence is read. The discrimination of the optical disc is not limited to the case where the discrimination is performed in response to a read request from the computer device, but may be performed automatically when the optical disc 10 is mounted on the optical disc device 20.
[0054]
In this way, the optical disk device 20 determines the optical disk, and controls the reproducing operation based on the determination result. FIG. 10 is a flowchart showing the reproducing operation of the optical disk. In step ST21, it is determined whether or not the optical disc is a format in which video and audio are recorded. Here, when it is determined by the above-described optical disk determination operation that the optical disk is a format in which video and audio are recorded, the process proceeds to step ST22. If it is not determined that the optical disk is a format in which video and audio are recorded, the process proceeds to step ST24.
[0055]
In step ST22, a reproduction operation emphasizing silence is performed. In this reproducing operation, the rotation speed of the optical disk is reduced by reducing the reading speed in a range where the video and audio are not interrupted, and the operation sound generated by the rotation of the optical disk is reduced, and the process proceeds to step ST23.
[0056]
In step ST23, when a part of the data cannot be correctly read from the optical disk, a response process that emphasizes real-time reproduction is performed. In this response process, even if part of the data cannot be correctly read from the optical disk during the reproduction of the video or audio, the reproduction operation is continued so that the video or audio is not interrupted.
[0057]
When the process proceeds from step ST21 to step ST24, in step ST24, it is assumed that a reproduction operation that emphasizes the reading speed is performed. In this reproducing operation, the reading speed is increased so that the data recorded on the optical disc can be read in a short time. That is, the rotation speed of the optical disk is set high, and the process proceeds to step ST25.
[0058]
In step ST25, a response process that emphasizes accuracy is performed. In this response process, when data cannot be read correctly, a retry operation is performed, and data reading is repeated. In the retry operation, the rotation speed and the read conditions are changed so that data can be read correctly. For example, the rotation speed of the optical disk may be reduced, or data may be read from a position before the position where the data reading failed.
[0059]
Thus, the reproducing operation of the optical disk is controlled according to the result of the determination of the optical disk. Further, when it is determined that the optical disk has a format in which video and audio are recorded, the reproducing operation may be switched so that not only the silence but also the power consumption can be reduced. For example, when the noise reduction is most important, the optical disc 10 is driven by a CLV (Constant Liner Velocity) method. In this case, since the optical disk 10 is rotated at a constant linear velocity, the rotation speed is lower on the outer peripheral side than on the inner peripheral side, so that the operation sound can be reduced. When not only reducing noise but also reducing power consumption, the optical disk is driven by a CAV (Constant Angular Velocity) method. In this case, since the optical disk 10 is rotated at a constant angular velocity, the load on the spindle motor 22 is reduced, and power consumption can be reduced. The rotation driving method is not limited to the CLV method or the CAV method, but may be a method using a ZCLV (ZoneCLV) method, a ZCAV (ZoneCAV) method, or the like. As described above, by making it possible to switch between a plurality of reproduction operations having different power consumptions, it is possible to perform a reproduction operation that prioritizes noise reduction and a reproduction operation with low power consumption as well as the noise reduction.
[0060]
Furthermore, the data amount of the data to be pre-read can be switched based on the determination result of the optical disk. That is, in an optical disk of a format in which video and audio are recorded, recorded data is often read out sequentially. For this reason, by increasing the data amount of the data to be pre-read, the processing of the read data can be performed efficiently, and the interruption of the video and audio can be prevented. Also, when the optical disk is not an optical disk of a format in which video and audio are recorded, for example, when computer data is recorded, if the recorded data is to be read randomly, the data that is read in advance sequentially becomes invalid. . Therefore, by reducing the amount of data to be pre-read, data can be read efficiently without reading unnecessary data.
[0061]
As described above, by controlling the reproducing operation according to the discrimination result of the optical disk, the reproducing operation suitable for the information recorded on the optical disk can be performed.
[0062]
【The invention's effect】
According to the present invention, the first information describing the volume space in the volume recognition sequence is read from the optical disc, and the recording position information of the second information describing the directory hierarchy is obtained. You. The optical disc is determined based on whether or not the second information read based on the recording position information includes a predetermined directory identifier. For this reason, even if the recording position of the second information including the predetermined directory identifier is changed, the discrimination can be performed, and the discrimination ability of the optical disc can be enhanced.
[0063]
In addition, since the reproducing operation of the optical disk is controlled according to the discrimination result of the optical disk, the reproducing operation suitable for the information recorded on the optical disk can be performed. Here, since the reading speed of the information from the optical disc is switched according to the determination result, it is possible to perform the reproducing operation that emphasizes the noise reduction and the reproducing operation that emphasizes the reading speed. In addition, since the response processing when information recorded on the optical disk cannot be read is switched based on the determination result, it is possible to perform a response processing emphasizing real-time reproduction and a response processing emphasizing accuracy. Furthermore, when it is determined that the optical disk is of a format in which video and / or audio is recorded, a plurality of playback operations having different power consumptions can be switched, so that the playback operation with the highest emphasis on noise reduction and noise reduction and low power consumption. The reproduction operation can be performed in a timely manner.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an optical disk device.
FIG. 2 is a diagram showing a format configuration of a DVD.
FIG. 3 is a diagram showing a volume structure.
FIG. 4 is a diagram illustrating a part of the configuration of a “Primary Volume Descriptor”.
FIG. 5 is a diagram showing a configuration of a path table record.
FIG. 6 is a diagram showing a configuration of an application layer.
FIG. 7 is a flowchart illustrating an optical disc determination operation.
FIG. 8 is a diagram illustrating an example of information of the LSN 16;
FIG. 9 is a diagram illustrating an example of information of a path table.
FIG. 10 is a flowchart showing an optical disk reproducing operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Optical disk, 20 ... Optical disk apparatus, 21 ... Spindle motor drive part, 22 ... Spindle motor, 30 ... Optical pickup, 31 ... RF amplifier, 32 ... Signal processing part , 33 ... servo processing unit, 34 ... memory unit, 35 ... host interface, 36 ... signal modulation unit, 37 ... light beam modulation unit, 38 ... driver, 39 ... Feed drive unit, 40 ... feed motor, 50 ... control unit

Claims (14)

Reading the first information describing the volume space in the volume recognition sequence from the optical disc and acquiring recording position information of the second information describing the directory hierarchy;
Reading the second information based on the recording position information;
Discriminating the optical disc based on whether or not the second information contains a predetermined directory identifier. 2. The method according to claim 1, wherein the first information is a basic volume descriptor, the second information is a path table, and the predetermined directory identifier is a video and / or audio directory identifier. The reading of the first information includes:
2. The method according to claim 1, wherein a predetermined logical sector is read from a data area of the optical disc, and when the read information includes a predetermined standard identifier, the read information is used as the first information. Optical disc discrimination method described in the above. Reading the first information describing the volume space in the volume recognition sequence from the optical disc and acquiring the recording position information of the second information describing the directory hierarchy;
Reading the second information based on the recording position information;
Determining the optical disc based on whether or not the read second information includes a predetermined directory identifier;
Controlling the reproduction operation of the optical disk according to the discrimination result of the optical disk. 5. The optical disc reproducing method according to claim 4, wherein in the step of controlling the reproducing operation, a reading speed of information from the optical disc is switched according to the result of the determination. 5. The optical disc reproducing method according to claim 4, wherein, in the step of controlling the reproducing operation, a response process when information recorded on the optical disc cannot be read is switched based on the determination result. In the step of controlling the reproduction operation, a plurality of reproduction operations having different power consumptions can be switched when it is determined that the optical disk has a format in which video and / or audio is recorded by the determination of the optical disk. Item 5. An optical disk reproducing method according to Item 4. 8. The optical disk reproducing method according to claim 7, wherein the plurality of reproducing operations are different from each other in a rotation driving method of the optical disk. Reading means for reading information recorded on the optical disc;
By controlling the reading means, the first information in which the description about the volume space in the volume recognition sequence is made is read from the optical disk, and the recording position information of the second information in which the description about the directory hierarchy is made is obtained. The discrimination of the optical disc is performed based on whether or not the second information read based on the recording position information includes a predetermined directory identifier, and operation control is performed according to the discrimination result. An optical disk device comprising a control unit. 10. The optical disk device according to claim 9, wherein the first information is a basic volume descriptor, the second information is a path table, and the predetermined directory identifier is a video and / or audio directory identifier. 10. The optical disk device according to claim 9, wherein the control unit switches a reading speed of information from the optical disk based on the determination result. 10. The optical disk device according to claim 9, wherein the control unit switches response processing when information recorded on the optical disk cannot be read based on the determination result. 10. The apparatus according to claim 9, wherein the control means is capable of switching among a plurality of reproduction operations having different power consumptions when the discrimination of the optical disc determines that the optical disc has a format in which video and / or audio is recorded. Optical disk device. 14. The optical disk device according to claim 13, wherein the plurality of reproduction operations are reproduction operations in which the rotation driving method of the optical disk is different.

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