JP4130138B2 - Optical disc information recording / reproducing apparatus and disc management information acquisition method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical disc information recording / reproducing apparatus for reproducing recorded information from a so-called multi-session recording type optical disc capable of recording a plurality of sets of recording information including video and the like in a predetermined unit called a session, In particular, the present invention relates to a method for acquiring disk management information in such an apparatus.
[0002]
[Prior art]
A multi-session recording type optical disc in which a plurality of sessions can be recorded on the same disc is widely adopted especially in an optical disc capable of recording a large amount of information. As such an optical disc capable of multi-session recording, a write-once disc such as CD-R or CD-RW (hereinafter referred to as CD-R / WR) is generally used. DVDs such as DVD-R and DVD + R that can record a larger amount of information including image information and the like have been widely used.
[0003]
As described above, in a write once type optical disc represented by CD-R (CR-Recordable), data can be written by a user. However, once written data cannot be rewritten, When data is written to the disk, it is recorded on the disk in a unit called the above-described session, that is, as a session different from the session including already written data.
[0004]
When the recorded information is taken out from such a write-once disc, the optical disc is mounted on the recording / reproducing apparatus. In this case, generally, the data recording state and contents of information recorded on the disc and usable are confirmed. Therefore, a so-called search operation is performed. In particular, in a multi-session recording type disc, the above search is performed in the order recorded on the disc for a set of data units called sessions.
[0005]
In addition, the so-called multimedia information that can be optically read and recorded in a large amount of various types of information, including the above-described write-once optical disc, is called ECC in order to correct errors caused by various causes such as reading. An error correction code is added to the data, which makes it possible to correctly demodulate the data from the disk. Examples of using such error correction in an optical disc recording / reproducing apparatus include Patent Documents 1 to 3 listed below.
[0006]
By the way, as described above, in a multi-session recording type optical disc in which a plurality of sessions can be recorded on the same disc, when the optical disc is mounted on the recording / reproducing apparatus, information recorded on the disc can be used. An operation called a search for confirming the data recording state and its contents is performed. At that time, particularly in the case of a multi-session recording type disc, the above search is performed according to the order recorded on the disc for a set of data units called sessions.
[0007]
In particular, in CD-R / RW, a plurality of sessions each consisting of three areas called a lead-in area (I), a data area (D), and a lead-out area (O) are recorded on the recording area of the disc. Therefore, when performing the above-described search, for example, as known in the following Patent Documents 4 to 6, information recorded on the disc is recorded in units of the session. Then, when you go through one by one and search for the last session, use the management information (especially the sub-code called TOC (Table Of Contents) recorded in the lead-in area of each session) Reading and writing are performed.
[0008]
[Patent Document 1]
JP-A-8-214104 [Patent Document 2]
JP-A-7-296531 [Patent Document 3]
JP 2001-168798 A [Patent Document 4]
Japanese Patent Laid-Open No. 2002-1224068 [Patent Document 5]
JP 2000-285461 A [Patent Document 6]
JP-A-6-349252
[Problems to be solved by the invention]
As described above, in the above-described prior art, in the write-once type optical disc represented by the above-described CD-R, the recording / reproducing operation by the apparatus is possible by reading the disc management information recorded in the area on the disc. However, if this disc management information recording area is broken, this disc management information cannot be read, so that the last session required for the recording / playback operation by the device cannot be recognized. There was a problem that it would become impossible.
[0010]
Accordingly, the present invention solves the problems in the prior art as described above, that is, in the case of disc management information recorded on the write-once multi-session disc represented by CD-R or the like cannot be read. However, by making it possible to discriminate the final session recorded on the disc, the recognition rate when recording / reproducing the disc is improved, and the optical disc information enabling more reliable recording / reproduction of recorded information It is an object of the present invention to provide a recording / reproducing apparatus, and further to provide a method for acquiring management information of a multi-session type optical disc in such an apparatus.
[0011]
[Means for Solving the Problems]
The present invention has been made for the first time by paying attention to the fact that such write-once disc management information is rewritten by adding only a part of the previously recorded data (ie, there are many identical portions). Based on this fact, when the disk management information of the last session cannot be read (even by ECC), the data portion having a high probability of being identical is read and interpolated by reading the previous readable information, The essential point is to make it possible to correct the disk management information of the necessary final session by the ECC function.
[0012]
More specifically, according to the present invention, in order to solve the above-described problems, first, an optical head is moved onto a disk-shaped optical disc and irradiated with a laser beam to record or reproduce recorded information on the optical disc. An optical disk information recording / reproducing apparatus comprising: means for reading disk management information that can be recorded on a predetermined unit of a plurality of pieces of recording information on the optical disk; and the disk management information reading means is the latest disk When the management information cannot be read, an optical disk information recording / reproducing apparatus provided with means for reading and reproducing the previously recorded disc management information is provided.
[0013]
According to the present invention, in the optical disc information recording / reproducing apparatus described above, the disc management information reproducing means interpolates a part of the latest disc management information that cannot be read by previously recorded disc management information. And / or the disk management information reproducing means further includes means for performing error correction on the read disk management information.
[0014]
Further, according to the present invention, in order to achieve the above-mentioned object, the optical head is moved onto a disk-shaped optical disk and irradiated with a laser beam to record or reproduce recorded information on the optical disk. In the reproducing apparatus, when the disc management information of the optical disc is obtained and the disc management information that can be recorded on the optical disc in a predetermined unit is read and the latest disc management information cannot be read. Provides a method of acquiring disk management information for reading and playing back previously recorded disk management information.
[0015]
In the present invention, in the disk management information acquisition method described above, when the latest disk management information is not readable, a part of the latest disk management information that cannot be read was previously recorded. When the disc management information is interpolated and / or the latest disc management information cannot be read, error correction is performed on the read disc management information.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First, FIG. 2 of the accompanying, optical information recording / reproducing apparatus, according to an embodiment of the present invention (so-called drive) by information additional recording / reproducing possible optical disks, Chi I nest, CD-R / RW, DVD Appearances such as −R and DVD + R are shown. As shown in this figure, generally in such a write-once type optical disc by multi-session, data is called a so-called session starting from the inner peripheral portion 110 of the disc-like disc 100 and moving toward the outer periphery of the recording area 120. It is recorded in a predetermined unit.
[0017]
However, among the above optical disks, in particular, in a disk called DVD + R, an area (block) in which session position information, which is a part of the management information of the disk, is recorded on the inner periphery 110 of the disk-shaped disk 100. In the recording area 120, a plurality of information of a predetermined unit called the session can be recorded.
[0018]
Next, the format of the multi-session recorded on the optical disc called CD-R / RW is configured from the inner circumference side of the disc as a PMA area, a first session, a second session, and so on. Each session includes a lead-in area (LI), a program area (PGM), and a lead-out area (LO) as shown in FIG. A TOC (Table Of Contents), which is disc management information, can be additionally written at a predetermined position in the lead-in area (LI).
[0019]
On the other hand, in the DVD disc called DVD + R, as information of predetermined units called recordable session thereon, In general, TOC (Tn: where, n is a natural number) blocks (regions) called, the disc 100 Ru Tei provided on the inner peripheral portion 110 (see Figure 2). Each of the plurality of sessions recorded in the recording area 120 includes a lead-in, an intro (In: where n is a natural number), a data zone (DZn: where n is a natural number), as shown in FIG. ), A region (block) called a closure (Cn: where n is a natural number).
[0020]
Further, in this DVD + R, in the TOC block of the inner periphery 110 of the disc, session position information (that is, the start / end address of each session is written) every time each session is closed. Are added one block at a time. That is, in a DVD + R multi-session disc, disc management information called a TOC block is collected and arranged in a predetermined area of the disc, that is, the inner periphery of the disc, and the block immediately before the unrecorded portion is arranged. The TOC is effective.
[0021]
Further, FIG. 5 attached here shows more detailed configuration contents of blocks (areas) constituting each session in the DVD + R. First, an initial zone, an inner disc identification zone, a buffer zone, control data, and a buffer zone are provided in the lead-in area. Further, Buffer Zone, SIZ, and control data are sequentially provided in the intro area, and further, Buffer Zone and SIZ are provided in the closure area. That is, in each session, control data (DCB: Disc Control Block) which is disc management information is written, and the start / end addresses in the session to which it belongs (however, in the case of lead-in, The start / end address of session # 1 is recorded. Although not shown here, the final session (open) configuration (track configuration) is written in the SIZ of the intro of the final session, and the drive cannot be recorded on the disk unless this SIZ is read. . Therefore, in order to read this SIZ, recognition of the above-mentioned final session is necessary and important.
[0022]
The search operation in the DVD + R having the above configuration will be briefly described with reference to FIG. 5. When a disk is loaded in the apparatus, the head is first moved to the disk inner periphery 110 to search for the TOC block. The position (address) of the last session is confirmed by searching this TOC block, the head is moved to the position of the last session, and the SIZ is read from the control data in the lead-in or intro (see the arrow in the figure). On the other hand, when the TOC block is destroyed and cannot be read, the control data is read from the lead-in of session # 1, the address of the next session is confirmed, the head is moved to that position, and the intro control is performed. Moves further from the data to the next session, repeats this to reach the final session, and is written in the SIZ of the final session intro to read the final session (open) configuration (track configuration), and the device plays / records it Operation is possible.
[0023]
Next, a schematic configuration and operation of an optical disc apparatus (hereinafter simply referred to as a drive) which is an information recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the block diagram of FIG. Explained.
[0024]
In FIG. 6, the host device 400 is a so-called host device of the so-called optical disk device 500 configured from, for example, a host computer. The command issued from the host device 400 is received by the interface controller 502 constituting the optical disk device 500 and transmitted to the microprocessor 504. The microprocessor 504 has a control memory 505 that is a high-speed IC memory. In the control memory 505, so-called micro program codes that operate on the microprocessor 504 are recorded.
[0025]
Here, when the command issued from the host device 400 is a recording request, the microprocessor 504 performs an operation of transferring the recording request data from the host device 501 to the buffer memory 503 via the interface controller 502. I do.
[0026]
Next, the microprocessor 504 constituting the optical disc apparatus 500 instructs the recording circuit 506 to perform encoding, and the recording circuit 506 performs recording request data encoding processing on the buffer memory 503. Then, the microprocessor 504 instructs the recording circuit 506 to record the data that has been encoded at a predetermined position of the optical disc medium 100, and the recording circuit 506 passes through the optical head 508 and the optical disc medium 100. The recording is performed at a predetermined position.
[0027]
When the instruction issued from the host device 400 is a reproduction request, the microprocessor 504 instructs the reproduction circuit 507 to reproduce data from a predetermined position on the optical disc medium 301. On the other hand, the reproduction circuit 507 stores the data reproduced from the predetermined position of the optical disc medium 100 via the optical head 508 in the buffer memory 503. If there is an error in the reproduced data, the reproduction circuit 507 performs error correction. Next, the microprocessor 504 performs an operation of transferring the reproduction data from the buffer memory 503 to the host device 400 via the interface controller 502. The above operation is the same as that of a general drive. In addition, the movement of the optical head on the optical disk may be performed by the microprocessor 504 via, for example, a servo circuit or a feed mechanism unit (not shown), which is similar to the operation of a general drive. .
[0028]
Next, a method for acquiring disc management information in the optical disc apparatus (drive) according to an embodiment of the present invention, particularly in the multi-session type optical disc, will be described in detail below with reference to the flowchart of FIG. explain.
[0029]
In the following description, the management information of the disc recorded on the disc is represented by the symbol M. The disk management information M is, for example, TOC information additionally recorded at a predetermined position in the lead-in area (LI) of each recorded session in the recordable CD-R / RW. On the other hand, in the DVD + R, the TOC information in the TOC block of the inner peripheral portion 110 of the disc, or the control data DCB added to the lead-in area or intro area of each session corresponds.
[0030]
In the flowchart of the disc management information reading process shown in FIG. 1, first, an unrecorded search of the disc management information area is performed (step S11), and then, an effective disc immediately before the unrecorded portion (ie, the last session). Management information (block) is read (step S12). In particular, since the DVD data is scrambled, descrambling processing is performed here (step S13).
[0031]
Thereafter, it is determined whether or not the reading of the latest valid disk management information is OK (step S14). As a result, when the effective disk management information can be read (“Y (es)” in the figure), the disk management information reading process is normally terminated.
[0032]
On the other hand, for example, when the TOC block in the lead-in area or the inner periphery of the disk is damaged and correction is impossible even by ECC (ECC correction impossible: “N (o)” in the figure), the previous one A block is read (step S15). Here, for the same reason as described above, the descrambling process is also performed on the read block data (step S16).
[0033]
Thereafter, it is determined again whether or not the reading of the effective disk management information of the previous block is OK (step S17). As a result, if the reading of the disk management information of the previous block is also uncorrectable by ECC ("N (o)" in the figure), the process moves to step S15. Read the block. However, even in this case, if the first block cannot be read, the process ends abnormally.
[0034]
Next, when “Y” in step S17, that is, the new disc management information immediately before the unrecorded portion (final session) cannot be read, but the previous (old) disc management information can be read. Performs the interpolation by copying the same data portion of the old management information (B) read in step S16 to the effective management information (A) that could not be read in step S12 (step S18). At this time, the identity of the data between the new disk management information (A) and the old management information (B) is determined according to whether or not the parts should be the same according to the standard. Is possible. Thereafter, the interpolated data is scrambled again (step S19), and further ECC correction is performed (step S20).
[0035]
Thereafter, the scrambled data is descrambled (step S21), and it is further determined whether or not the correction is OK (step S22). Accordingly, if it is determined in step S22 that the ECC correction is successful (“Y” in the figure), the descrambled data can be used as valid management information, but the ECC correction is impossible (“N” in the figure). If it is determined that the disk management information cannot be read, the process ends abnormally.
[0036]
The above-described acquisition of the disk management information is performed by the microprocessor 504 in accordance with the contents of the micro program code recorded in the control memory 505 in the configuration shown in FIG.
[0037]
Further, the principle of the disk management information acquisition method according to the present invention described above will be described in more detail below.
[0038]
That is, as shown in FIG. 7 attached, since data once recorded cannot be rewritten on a write-once disc, data is frequently updated. In particular, the management information of the disk is added as a new data block every time data is updated (added), so the last block (just before the unrecorded part) of the disk management information area is the only effective management. Information (in the case of FIG. 7, M4). An example of the contents of the disk management information recorded in each of the blocks M1 to M4 is shown in the lower part of the figure. As can be seen from the following, each data update (addition) is performed immediately before that. In addition to the update data written in the block, new update data is written. (For example, in updating M2, “update data 2” is added to “header data” and “update data 1” of M1 and recorded.)
[0039]
Therefore, when reading the disc management information as described above, first, an unrecorded search of the management information area is performed, and the block immediately before the unrecorded portion is read (in the case of FIG. 7, M4).
[0040]
However, at this time, as shown in the attached FIG. 8, when the block (M4) immediately before the unrecorded block cannot be read due to the ECC correction failure, according to the present invention, the block immediately before ( Read M3). As described above, the position and amount of the update data for each update of the management information is clear according to the standard (however, the content of the data to be updated is undefined). Therefore, for the data that is not updated (in FIG. 8, “header data”, “update data 1”, “update data 2”, “update data 3” of M4), valid blocks (original data not destroyed) It should be the same for the block M4) and the previous block (M3).
[0041]
Therefore, according to the present invention, the portion of data that is not updated in accordance with the standard is interpolated by copying the data of the immediately preceding block. That is, as shown on the right side of the figure, most of the destruction ("header data" to "update data 3" of M4) is reproduced by this interpolation. Then, ECC correction is performed again in this interpolated state, and as a result, if correction is possible, data obtained by the correction is used as effective management information. In other words, the ECC capability normally employed in write-once discs including CD-R / RW, DVD-R, DVD + R, etc. is that when the amount of destroyed data is smaller than the total amount of data in the block. Can expect enough. For this reason, the data amount of the disk management information to be updated is usually smaller than the data amount of the entire block as described above (that is, a part of “update data 4” in the case of FIG. 8). If the data of the portion ("header data" to "update data 3") is correct, the updated data ("update data 4") can be sufficiently corrected by the ECC even if it is broken. Note that since the ECC correction code uses a valid block, it is not erroneously corrected to old block data.
[0042]
Incidentally, by using the disc management information reproduced as described above, the optical disc apparatus which is an information recording / reproducing apparatus for recording / reproducing information from the disc stores the necessary disc management information. Even when a block (area) is destroyed and cannot be read, valid disk management information (block) immediately before the unrecorded portion (that is, the last session) can be correctly read. As a result, the intro SIZ of the last session can be read. Thus, the recognition rate when recording / reproducing the disc is improved, and recording / reproduction of recorded information can be performed more reliably.
[0043]
【The invention's effect】
As described in detail above, according to the optical disc information recording / reproducing apparatus and the disc management information acquisition method thereof according to the present invention, when a block (area) in which disc management information is recorded cannot be read due to destruction. However, it is possible to correctly read the valid disc management information immediately before the unrecorded portion (final session), thereby improving the recognition rate when recording / reproducing the disc, and more reliable recording / reproducing of the recorded information. Demonstrate the excellent effect that is possible.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a method for acquiring disk management information in an optical disk information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a multi-session recording type disc on which information can be additionally recorded / reproduced by the optical disc information recording / reproducing apparatus.
FIG. 3 is a diagram showing an example of a format structure of a multi-session called CD-R / RW which is a kind of the multi-session recording type disc.
FIG. 4 is a diagram showing an example of a multi-session format configuration called DVD + R, which is a kind of the multi-session recording type disc.
FIG. 5 is a diagram illustrating a block arrangement on a multi-session recording type DVD disc called DVD + R.
FIG. 6 is a block diagram showing a schematic configuration of an optical disc information recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 7 is an explanatory diagram for explaining a method of acquiring disc management information in the optical disc information recording / reproducing apparatus of the present invention.
FIG. 8 is also an explanatory diagram for explaining a method of acquiring disc management information in the optical disc information recording / reproducing apparatus of the present invention.
[Explanation of symbols]
100 Optical disc (DVD + R)
110 Inner circumference 120 Recording area 500 Optical disk device 504 Microprocessor 505 Control memory 508 Optical head.

Claims (2)

An optical disc information recording / reproducing apparatus for moving an optical head onto a disk-shaped optical disc and irradiating a laser beam to record or reproduce recorded information on the optical disc, and managing a plurality of discs recorded in a predetermined unit A disc management information reading means for reading the disc management information from the optical disc on which the information is recorded, and the disc management information reading means is recorded before the latest disc management information if it cannot be read; The disc management information is read out , a part of the latest disc management information that cannot be read is interpolated by the previously recorded disc management information, and further, the error is corrected to the latest disc management information that has been interpolated. comprising means for performing, when a correction is made, the disk management information obtained by correcting a valid disk management information Optical information recording / reproducing apparatus characterized by the use. This is an acquisition method for acquiring disk management information of an optical disk in an optical disk information recording / reproducing apparatus that records or reproduces recording information on the optical disk by moving an optical head onto a disk-shaped optical disk and irradiating a laser beam. When the disc management information is read from the optical disc on which a plurality of disc management information recorded in a predetermined unit is recorded , and the latest disc management information cannot be read, the disc management information recorded before that reads, interpolated by some previous disc management information recorded in the latest disc management information unreadable, further performs error correction on the latest disc management information of said portion is interpolated, corrections If it made, especially to utilize the disc management information obtained by the correction as a valid disc management information How to get the disk management information to.

Images