JP2009076124A - Optical disc apparatus, optical disc recording method and reproducing method - Google Patents

Abstract

When a type of optical disk is a download disk, even if data recording or reproduction fails, data subsequent to the data can be continuously recorded or reproduced.
In an optical disc apparatus for recording / reproducing data on a write-once type optical disc, a type of the optical disc is determined, an error occurrence during recording and reproduction is detected, and a microcomputer for controlling a signal processing circuit is provided. Is provided. If the microcomputer 7 detects an error during recording or reproduction, if the optical disc is a download disc, the microcomputer 7 skips the defective portion where the error occurred and records or reproduces the next data from the next recording area. Control to continue.
[Selection] Figure 3

Description

  The present invention relates to an optical disc apparatus, an optical disc recording method, and a reproduction method that are suitably processed when a recording or reproducing operation fails according to the type of the optical disc medium.

  In a recordable optical disc, if a defective portion exists on the recording surface of the disc, servo control cannot be performed and the recording operation fails. At present, in a write-once type DVD-R disc that can be recorded only once, a retry process is not performed when recording fails, and the recording operation is interrupted at that time. For this reason, unless special recovery processing is performed, it is impossible to use an unrecorded and recordable area ahead of a defective portion where recording has failed.

  On the other hand, some recovery techniques have been proposed for continuously recording data on a recording medium even when data recording fails.

  Japanese Patent Application Laid-Open No. 2004-228561 discloses a technique for continuing recording of stream data as a new file when a recording error occurs and then correcting the file management information. As its effect, it is stated that the processing time from the occurrence of a recording error to the resumption of recording is short, and stream data lost due to the recording error is reduced.

  In Patent Document 2, in an optical disc having a plurality of recording layers, when recording cannot be continued in the middle of recording, the recording layer differs in the inner circumferential direction from the point where recording cannot be continued on the optical disc surface. A technique for continuing recording is disclosed. As an effect thereof, it has been stated that when a recording error occurs in the outer peripheral portion of the optical disc, the inner peripheral portion of a different recording layer of the optical disc that has been wasted can be used without waste.

  In Patent Document 3, when a recording error occurs, address information of a sector beyond the defective area where the recording error has occurred is obtained based on the address of the sector where the recording error has occurred, and an optical pickup is used as the address information. A technique is disclosed in which input data is recorded from a seek position by seeking a sector based on the seek position. As its effect, it is stated that the recording operation can be continued beyond the defect portion, and the unrecorded portion can be minimized even in the optical disc having the defect portion.

JP 2007-18631 A JP 2006-216126 A JP 2005-332494 A

  Recently, a dedicated optical disc (hereinafter referred to as “download disc”) for recording video and audio contents supplied via download from the Internet or the like has been proposed.

  One example is a “DVD-Download Disc”. This is a dedicated medium for recording content (CSS encrypted DVD-Video content) of a predetermined format supplied via download, and is a write-once disc that is additionally defined in the DVD-R standard (DVD Recordable Disc for General). It is. In other words, the DVD download disc is limited to the use (CSS Managed Recording) for recording the content of the DVD video format encrypted by using the CSS system (Content Scramble System).

  Even for download discs, it is necessary to appropriately determine the processing method for recording failure. As such a method, as disclosed in Patent Documents 1 to 3, a recovery process for continuously recording data after the occurrence of a recording error can be considered. Here, in Patent Documents 1-3 described above, in accordance with the standard of a conventional write-once disc (DVD-R), rewriting of file management information such as change of recording address is essential in the recovery processing step. On the other hand, the new download disc is restricted by the DVD video format, and the file management information of the downloaded content cannot be changed. Therefore, the recovery process as disclosed in Patent Documents 1-3 cannot be adopted for the download disk.

  An object of the present invention is to enable continuous recording or reproduction of data after the data even when data recording or reproduction fails when the type of the optical disk is a download disk.

  The present invention provides an optical disc apparatus for recording and reproducing data on a write-once type optical disc, a pickup for irradiating the optical disc with laser light to record or reproduce data, processing the recorded data and supplying the pickup to the pickup. A signal processing circuit for processing a reproduction signal from the recording medium, and a microcomputer for determining the type of the optical disc, detecting an error during recording and reproduction, and controlling the signal processing circuit, and the microcomputer When the occurrence of an error is detected, if the optical disc is a download disc, control is performed to skip the defective portion where the error has occurred and continue recording the next data from the next recording area.

  In the optical disk recording method for recording data on a write-once type optical disk, the present invention detects a recording error, a step of determining the type of the optical disk, and a detection of an error in recording. If the optical disc is a download disc, the method includes a step of skipping a defective portion where an error has occurred and continuing to record the next data from the next recording area.

  The present invention relates to an optical disc reproducing method for reproducing data from a write-once type optical disc, in the case of detecting an error occurrence during reproduction, a step of determining the type of the optical disc, and an error occurrence during reproduction, If the optical disc is a download disc, the method includes a step of skipping a defective portion where an error has occurred and continuing reproduction of the next data from the next recording area.

  According to the present invention, wasteful use of a download disc due to recording failure can be suppressed, and interruption of content (video and audio) playback during playback from the download disc can be suppressed, improving user convenience. To do.

  FIG. 1 is a block diagram showing an embodiment of an optical disc apparatus according to the present invention. The optical disk apparatus 10 of this embodiment rotates a mounted download-only optical disk 1 (DVD download disk) by a spindle motor 2, and the pickup 3 irradiates the recording surface of the optical disk 1 with laser light generated by a semiconductor laser. Record or play data. The pickup 3 is moved to a desired track position on the optical disc by a thread mechanism (not shown). The driver 4 supplies a drive signal to the spindle motor 2 and the pickup 3.

  The signal processing circuit 5 processes a signal read from the optical disc 1 to acquire disc management information and reproduces data based on the disc management information. The reproduced data is temporarily stored in the memory 6 and then transferred to the host device 9 such as a PC via the interface 8. On the other hand, the contents of the DVD video format and file management information (recorded data) are transferred from the host device 9 via the interface 8. The transferred recording data is temporarily stored in the memory 6 and then converted into a predetermined recording signal by the signal processing circuit 5. The pickup 3 records the file management information on the optical disc 1 together with the content as it is.

  The microcomputer 7 determines the type of the loaded disk based on the disk management information read from the optical disk 1 and a signal specific to the disk. Further, the occurrence of a recording or reproduction error is detected from address information read from the disc. When a recording / reproducing error occurs, if the disc is a DVD download disc, the defective portion where the error has occurred is skipped and recording or reproduction of the next data is continued from the next recording area. To control.

  Here, the DVD download disk will be described. DVD download discs are limited to applications that download and record DVD video format content encrypted using CSS.

  In the case of an unrecorded DVD download disc, a predetermined code indicating that the disc is a DVD download disc is included in prepit information obtained by decoding a prepit formed (embossed) in advance on a land portion of the disc. In the case of a recorded DVD download disc, the control data in the lead-in area of the disc includes a predetermined index indicating that it is a DVD download disc. Therefore, the disc type can be determined by detecting these predetermined data. In addition, the disc can be identified as a DVD download disc from the disc-specific characteristics such as the wobble frequency and disc reflectivity.

  FIG. 2 is a diagram illustrating an example of a recording pattern on the optical disc. (A) shows a recording pattern in normal recording. .. Are recorded in a predetermined unit (ECC block unit) in the order of data D1, D2, D3,...

  (B) shows a recording error detection signal 29. Here, it is assumed that an error has occurred while recording the data D2 in the area 22. The cause of the recording error is often due to defects such as scratches and fingerprints on the disk, which causes tracking and focus control to be lost and data cannot be recorded normally. The recording error is detected by comparing the address information detected from the disc with an expected value, and generating a recording error detection signal 29 if there is a mismatch. Alternatively, the recording error detection signal 29 may be generated when the envelope of the tracking error signal or the focus error signal is monitored and the amplitude level exceeds an allowable value. According to these detection methods, since the recorded data is not reproduced and verified (verify operation), an error can be quickly determined while recording.

  (C) shows a recording pattern when an error occurs. When a recording error occurs during recording in the area 22, recording in the area 22, which is a defective area, is stopped, and recording is continued from the next data D3 in the adjacent area 23 that follows. If the recording of the data D3 also fails, recording is continued from the next data D4 in the further adjacent area 24.

  In this way, data (D2 here) is lost due to a recording error, but other recorded data is correctly recorded in an area (address) that should be recorded. Also, the management information including the address information is left unchanged as it is downloaded without being changed. Therefore, the recorded management information can be referred to, the recorded data can be correctly reproduced, and the content (video or audio) can be viewed without hindrance.

  FIG. 3 is a flowchart showing the optical disk recording method in this embodiment. Hereinafter, each step will be described in order.

  In S301, the signal processing circuit 5 receives the recording data (block unit) from the memory 6, and advances the pickup 3 to a predetermined area (address) on the disc to record the data. In S302, the microcomputer 7 monitors the address information (or tracking error signal) being recorded to determine whether a recording error has occurred. If it is determined that the recording is normal, it is determined in S303 whether or not all the data has been recorded. If there is remaining data, the process proceeds to the next data processing in S304.

  If it is determined in S302 that the recording has failed (error has occurred), the type of the disc is determined in S305. For example, by reading the prepit information and control data in advance, it can be determined whether or not it is a download disc. If it is determined that the disk is a download disk, recording of the current data is stopped, and the process proceeds to S306 to continue processing from the next data. If it is determined in S305 that the disc is not a download disc (for example, a conventional DVD-R), the recording is stopped at that point and the processing ends.

  In this way, when the content to be recorded is a DVD download disc that is limited to the DVD video format, the recording area of the remaining disc can be used effectively by continuing the recording operation from the next data even if data recording fails. can do.

  So far, the processing when a recording error has occurred during data recording has been described, but the same processing can be performed when a reproduction error has occurred during data playback. The error at the time of reproduction includes not only an error (defective part) generated at the time of recording but also an error newly generated at the time of reproduction. Here, data is missing at the error location during recording. On the other hand, the data is normally recorded at a new error location at the time of reproduction, but it cannot be reproduced normally due to a scratch on the disc received thereafter.

  FIG. 4 is a flowchart showing an optical disk reproducing method in the present embodiment. Hereinafter, each step will be described in order.

  In S401, the signal processing circuit 5 advances the pickup 3 to a predetermined area (address) on the disk and reproduces data (block unit). In S402, it is determined whether or not a reproduction error has occurred. This is based on whether or not the error correction of the reproduction data has been normally performed in the signal processing circuit 5, or whether or not the address information being reproduced matches the expected value. Determine. If it is determined that the reproduction is normal, the reproduction data is stored in the memory 6, and it is determined in step S403 whether or not all the data has been reproduced. If there is remaining data, processing proceeds to the next data in S404.

  If it is determined in S402 that the reproduction has failed (error has occurred), the type of the disc is determined in S405. For example, by reading the prepit information and control data in advance, it is determined whether the disc is a download disc. If it is determined that the disk is a download disk, reproduction of the current data is stopped, and the process proceeds to S406 to continue processing from the next data.

  If it is determined in S405 that it is not a download disc (for example, a conventional DVD-R), a playback retry is executed in S407. In step S408, it is determined whether the reproduction retry is successful. If successful, the reproduction data is stored in the memory 6, and the process proceeds to the next data in S406. If playback retry fails, retry again. At this time, it is determined in S409 whether or not the number of retries exceeds a specified value, and if it exceeds the specified value, the reproduction process is terminated (retry over).

  In this way, in the case of a DVD download disc, even if data reproduction fails, continuous reproduction of the subsequent data may cause a video or audio disturbance at the defective part, Playback interruption can be avoided. This is an effective process especially when the disk has many physical scratches.

  FIG. 5 is a modification of the flowchart of FIG. In this example, when a playback error occurs, a playback retry is first executed regardless of the type of the disk.

  Steps S501 to S504 are the same as steps S401 to S404 in FIG. If it is determined in S502 that the reproduction has failed, a reproduction retry is performed in S505. In step S506, it is determined whether the reproduction retry is successful. If successful, the reproduction data is stored in the memory 6 and the process proceeds to the next data processing in S507. If the reproduction retry fails, it is determined in S508 whether or not the number of retries exceeds a specified value, and if it is within the specified value, the retry is executed again.

  If retry-over occurs, the type of the disk is determined in S509. If it is determined that the disk is a download disk, the reproduction of the current data is stopped, and the process proceeds to S507 to continue the process from the next data. If it is determined that the disc is not a download disc, the playback process is terminated.

  Also in FIG. 5, in the case of a DVD download disc, even if data reproduction fails, it is possible to avoid interruption of content reproduction. In this example, since there is a possibility that the data is recovered by the reproduction retry process, it is possible to suppress disturbance of video and audio.

  It is also possible for the user to select and set the implementation / non-implementation of the above function. In other words, if the user can tolerate a momentary video or audio disturbance, a command for enabling the above function is issued from the host device to the optical disc device, for example, before the start of recording / reproduction on the download disc. Conversely, when the user requests strict recording / playback of content, a command for disabling the above function may be issued.

  In the above embodiment, a DVD download disk has been described as an example of a recording medium. However, the present invention can be similarly applied to a write-once type dedicated disk for downloading content such as a DVD video format. Further, it goes without saying that the data to be recorded is the same as long as the content is supplied via download from the Internet or the like.

1 is a block diagram showing an embodiment of an optical disc apparatus according to the present invention. The figure which shows an example of the recording pattern on an optical disk. 3 is a flowchart showing an optical disk recording method in the present embodiment. The flowchart which shows the optical disk reproduction | regeneration method in a present Example. The other example of the flowchart which shows the optical disk reproduction | regeneration method in a present Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 3 ... Pickup, 4 ... Driver, 5 ... Signal processing circuit, 6 ... Memory, 7 ... Microcomputer, 9 ... Host apparatus, 10 ... Optical disk apparatus.

Claims (10)

In an optical disc apparatus for recording / reproducing data on a write-once type optical disc,
A pickup for irradiating an optical disc with laser light to record or reproduce data;
A signal processing circuit that processes the recording data and supplies it to the pickup, and processes a reproduction signal from the pickup;
A microcomputer for determining the type of the optical disc, detecting an error occurrence during recording and reproduction, and controlling the signal processing circuit;
When the microcomputer detects an error in recording, if the optical disk is a download disk, the microcomputer skips the defective portion where the error has occurred and continues recording the next data from the next recording area. An optical disc apparatus characterized by controlling. The optical disc apparatus according to claim 1,
The microcomputer determines whether or not the optical disc is a download disc from pre-pit information formed on the disc or control data in a lead-in area. The optical disc apparatus according to claim 1,
An optical disc apparatus characterized in that the microcomputer determines that an error has occurred during recording when the address information detected from the disc does not match an expected value. The optical disc apparatus according to claim 1,
The microcomputer further determines that an error has occurred when error correction during playback fails or the address information detected from the disc does not match the expected value, and an error occurs if the optical disc is a download disc. An optical disc apparatus characterized in that control is performed so as to skip the defective portion and continue reproduction of the next data from the next recording area. In an optical disc recording method for recording data on a write-once type optical disc,
Detecting the occurrence of an error during recording;
Determining the type of the optical disc;
When detecting the occurrence of an error at the time of recording, if the optical disc is a download disc, skipping the defective portion where the error has occurred and continuing the recording of the next data from the next recording area;
An optical disc recording method comprising: The optical disc recording method according to claim 5,
An optical disc recording method for determining whether or not the optical disc is a download disc from pre-pit information formed on the disc or control data in a lead-in area. The optical disc recording method according to claim 5,
An optical disc recording method comprising: determining that an error has occurred during recording when address information detected from the optical disc does not match an expected value. In an optical disc reproducing method for reproducing data from a write-once type optical disc,
A step of detecting an error occurrence during playback;
Determining the type of the optical disc;
When the occurrence of an error at the time of reproduction is detected, if the optical disc is a download disc, the step of skipping the defective portion where the error has occurred and continuing the reproduction of the next data from the next recording area;
An optical disc reproducing method comprising: The optical disc playback method according to claim 8, comprising:
An optical disc reproducing method, wherein whether or not the optical disc is a download disc is determined from pre-pit information formed on the disc or control data in a lead-in area. The optical disc playback method according to claim 8, comprising:
An optical disc reproducing method, wherein when an error correction of the reproduction data fails or when address information detected from the disc does not match an expected value, it is determined that an error occurs during reproduction.

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