JP2005216397A - Information recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restore accurately a start time and a finish time of a track which cannot be reproduced when address information of the track recorded in a PMA region of an optical disk cannot be reproduced by a reproduction error. <P>SOLUTION: This apparatus is provided with a restoring means 27 in which when address information of the track recorded in a PMA region of an optical disk 10 cannot be reproduced by a reproduction error, the start time of the track out of address information of the track which cannot be reproduced is restored by obtaining a start time of the track in TOC information recorded in a read-in region of the optical disk, a finish position of the track is restored by obtaining sub-code Q data of a boundary of the track which cannot be reproduced and the immediately after track. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for restoring the start time and end time of a track when the address information of the track recorded in the PMA area of the optical disk cannot be reproduced due to a reproduction error.

  When information is recorded on a single optical disc by using various information recording / reproducing devices of each company, the PMA area (Program Memory Area) of the optical disc is changed due to the difference in recording characteristics of each information recording / reproducing device. The recording state may become uneven. An optical disc recorded in this way is highly likely to cause a playback error during playback of the PMA area during playback. In the PMA area, track address information such as the start time and end time of the track is recorded at the end of the information recording on the track or before the information is recorded on the track.

  At the time of reproduction or additional recording, the address information of all tracks on the optical disc is grasped by collecting the address information of the tracks existing in the PMA area, and the reproduction or additional recording of the track is performed based on the address information. . Accordingly, if reproduction of the PMA area results in a reproduction error and data in the PMA area cannot be obtained, subsequent information reproduction or additional recording cannot be performed.

  In a CD-R (write-once CD) disk drive device, when the address information recorded in the PMA area of the CD-R disk cannot be reproduced, the lead-in area of the CD-R disk is read. Patent Document 1 already discloses a technique for generating address information by copying recorded TOC (Table of Contents) information and calculating the start time and end time of the track that could not be reproduced from the recorded track start time. (See, for example, Patent Document 1).

Japanese Patent Laid-Open No. 9-55033

  However, nothing is said about how to restore the end time of the track that could not be reproduced from the start time of the recorded track.

  Here, the layout of each area of an actual optical disc will be described.

  FIG. 3 is a diagram showing an example of the layout of each area of the optical disc. In general, the recording surface of an optical disk is configured from the innermost circumference toward the outermost circumference, a PCA area (Power Calibration Area) 31, a PMA area (Program Memory Area) 32, and a lead-in area (Lead-In Area) 33. , A track 1 area 34, a track 2 area 35, and a lead-out area 36. An area from a lead-in area 33 to a lead-out area 36 is called a session, and the track 1 area 34 and the track 2 area 35 are called a program area.

  Each of the track 1 area 34 and the track 2 area 35 has areas 34-1 and 35-1 called pre-gap at the head part thereof, but a PMA area (Program Memory Area) 32 and a lead-in area (Lead- The start time of the track recorded as TOC (Table of Contents) information of In Area) 33 indicates the start time of the track 1 area 34 and the track 2 area 35 after the pre-gap 34-1 and 35-1. ing. The TOC (Table of Contents) information does not record the end time of each track area. On the other hand, the end position of the track 1 area 34 continues to the head position of the pre-gap 35-1 of the next track 2 area 35. Therefore, if the lengths of the pre-gap 34-1 and 35-1 are known, the end times of the track 1 area 34 and the track 2 area 35 can be obtained, but the TOC (Table of Contents) information includes the length of the pre-gap. There is also no information indicating.

  Therefore, the track end time cannot be obtained directly from TOC (Table of Contents) information.

  The above-mentioned patent document does not mention how to restore the end time of the track that could not be reproduced from the start time of the recorded track. The start time of the track could be the end time of the track that could not be played, or the time before the start time of the next track could be the end time of the track that could not be played. However, the end time of the track that could not be reproduced cannot be accurately restored.

  If the start time of the next track is the end time of the corresponding track, the pre-gap of the next track will be played, and the time before the next track's start time can be played back. If the end time of the track is not present, the length of the pre-gap is not constant and the user can change the length. Depending on the set length of the predetermined time, the track may end without being played to the end of the track. The phenomenon will occur.

  Further, the above-mentioned patent document is an explanation only for CD-R (write-once CD) discs, and there is no mention of other overwritable CD-RW (rewritable CD) discs.

  The present invention accurately restores the start time and end time of a track that could not be reproduced when the address information of the track recorded in the PMA area of the optical disc could not be reproduced due to a reproduction error. In addition, in the overwritable optical disc, the start time and end time of the restored track are overwritten in the PMA area of the overwritable optical disc, so that the overwritable optical disc can be obtained by accurately restoring the start time and end time of the track. As a result, even an information recording / reproducing apparatus that does not include a restoring unit that restores the accurate start time and stop time of a track can perform reproduction or additional recording.

  Accordingly, an object of the present invention is to accurately restore the start time and end time of a track that could not be reproduced when the address information of the track recorded in the PMA area of the optical disc could not be reproduced due to a reproduction error. It is to provide a recording / reproducing apparatus.

  Another object of the present invention is to provide an information recording / reproducing apparatus for overwriting the start time and end time of a restored track in the PMA area of an optical disc capable of being overwritten.

  According to the present invention, in an information recording / reproducing apparatus for recording and reproducing information in a program area of an optical disc, the information cannot be reproduced when address information of a track recorded in the PMA area of the optical disc cannot be reproduced due to a reproduction error. Among the track address information, the track start time is restored by acquiring the track start time in the TOC information recorded in the lead-in area of the optical disc, and the end position of the track can be reproduced. There is provided a restoration means for obtaining and restoring the subcode Q data at the boundary between the track that did not exist and the track immediately thereafter.

  Further, the present invention provides an information recording / reproducing apparatus for recording and reproducing information in a program area of an rewritable optical disc when the track address information recorded in the PMA area of the optical disc cannot be reproduced due to a reproduction error. Of the address information of the track that could not be reproduced, the start time of the track is restored by acquiring the start time of the track in the TOC information recorded in the lead-in area of the optical disc, and the end position of the track is determined. And a means for acquiring and restoring the subcode Q data at the boundary between the track that could not be reproduced and the track immediately thereafter, and overwriting the PMA area of the optical disc with the start time and end time of the restored track. It is characterized by that.

  Further, the present invention provides an information recording / reproducing apparatus for recording and reproducing information in a program area of an rewritable optical disc when the track address information recorded in the PMA area of the optical disc cannot be reproduced due to a reproduction error. Of the address information of the track that could not be reproduced, the start time of the track is restored by acquiring the start time of the track in the TOC information recorded in the lead-in area of the optical disc, and the end position of the track is determined. The subcode Q data at the boundary between the track that could not be reproduced and the track immediately thereafter is acquired and restored, and the start time and end time of the restored track, and the track recorded in the PMA area of the optical disc The address information of the track when the address information has been reproduced is Characterized by comprising means for overwriting the MA region.

  According to the present invention, when the address information of the track recorded in the PMA area of the optical disc cannot be reproduced due to a reproduction error, the information recording / reproduction that accurately restores the start time and the end time of the track that could not be reproduced. A device can be obtained. Further, according to the present invention, it is possible to obtain an information recording / reproducing apparatus that overwrites the PMA area of an optical disc that can overwrite the start time and end time of the restored track.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a CD-RW drive apparatus which is an embodiment of an optical disk apparatus according to the present invention.

  In FIG. 1, a CD-RW drive device 20 for an overwritable optical disc 10 of the CD-RW standard includes an optical head 21, an optical head feed mechanism 22, an RF amplifier 23, a decoder 24, an external interface 25, a buffer memory 26, and a system controller. 27, an encoder 28, a laser drive circuit 29, and a spindle motor 30. The CD-RW drive device 20 is connected to the host computer 40 via the external interface 25, and records information input from the host computer 40 on the writable optical disc 10 of the CD-RW standard and reproduces it from the optical disc 10. The information is output to the host computer 40.

  The spindle motor 30 rotates the optical disk 10.

  The optical head 21 irradiates the optical disk 10 with a weak laser beam and reproduces the recorded information already recorded on the optical disk 10 by the reflected light of the laser beam during the reproducing operation for reproducing the recorded information from the optical disk 10. The RF signal corresponding to the recording information is output. Further, the optical head 21 forms a recording pit in the recording layer by a phase change caused by laser light heat by irradiating the optical disk 10 with a laser beam stronger than that at the time of reproduction during a recording operation for recording the recording information on the optical disk 10. Recording information is recorded by changing the reflectance of the recording layer.

  The optical head feeding mechanism 22 carries the optical head 21 and moves from the innermost circumference to the outermost circumference of the optical disc 10.

  The RF amplifier 23 amplifies the RF signal output from the optical head 21, binarizes the RF signal, and outputs it as digital data.

  The decoder 24 demodulates the digital data output from the RF amplifier 23 according to the CD format and the CD-ROM format, performs data error correction and error detection, and temporarily records them in the buffer memory 26.

  The external interface 25 controls information exchange between the connected host computer 40 and the CD-RW drive device 20.

  The buffer memory 26 also temporarily stores information recorded on the optical disc 10 input from the host computer 40 via the external interface 25.

  The encoder 28 modulates input information from the host computer 40 temporarily stored in the buffer memory 26 in accordance with the CD-ROM format and the CD format.

  The laser drive circuit 29 outputs a drive signal for driving the laser light source of the optical head 21.

  The system controller 27 is a CPU that controls all operations of the CD-RW drive device 20, and performs operation control of the optical head feed mechanism 22, the decoder 24, the encoder 28, and the external interface 25. Further, the information temporarily stored in the buffer memory 26 is read and the information is written to the buffer memory 26.

For example, when receiving a reproduction command, the system controller 27 instructs the optical head feed mechanism 22 to move the optical head 21 to a position facing the PMA area of the optical disk 10, and the optical head 21 moves the PMA of the optical disk 10. The track address information recorded in the area is reproduced to output an RF signal, amplified by the RF amplifier 23 and output as digital data, and the decoder 24 demodulates and outputs the digital data.
The system controller 27 determines whether the track address information recorded in the PMA area of the optical disc 10 according to the present invention has been reproduced or has not been reproduced due to a reproduction error, by looking at the output of the decoder 24.

  Here, when the track address information recorded in the PMA area of the optical disc 10 cannot be reproduced due to a reproduction error, the system controller 27 or the like executes the operation shown in FIG. Of the address information, the track start time and end time are accurately obtained and restored. The operation of FIG. 2 will be described below.

  In FIG. 2, in step 201, the system controller 27 instructs the optical head feeding mechanism 22 to move the optical head 21 to a position facing the lead-in area 33 of the optical disk 10, and the optical head 21 moves the optical disk 10. The start time of the track in the TOC information recorded in the lead-in area is acquired, restored, and stored.

  In step 202, the system controller 27 determines whether the track that could not be reproduced is the last track of the session including the track (track 2 corresponds in FIG. 3). If it is not the last track, the system controller 27 obtains the start time of the next track in the TOC information in step 203 and proceeds to step 205.

  In the case of the last track in step 202, in step 204, the system controller 27 acquires the start time of the lead-out area 36 of the session in the TOC information, and proceeds to step 205.

  In step 205, the system controller 27 instructs the optical head feeding mechanism 22 to move the optical head 21 to a position corresponding to a time slightly before the start time acquired in step 203.

In step 205, the system controller 27 instructs the optical head feed mechanism 22 to move the optical head 21 toward a position corresponding to the start time acquired in step 203.
In step 206, the sub-code Q information recorded over the entire track of the optical disc 10 is reproduced by the optical head 21, amplified by the RF amplifier 23, demodulated by the decoder 24, and output.

In step 207, the system controller 27 looks at the output of the decoder 24 and determines whether the track that could not be reproduced has been switched to the next track or the lead-out area 36.
If not switched in step 207, the process returns to step 206. If switched, in step 208, the system controller 27 obtains time information in the subcode Q information at the time of switching to obtain the end time of the track. Restore and remember.

  In this way, when the track address information recorded in the PMA area of the optical disc cannot be reproduced due to a reproduction error, the start time and end time of the track that could not be reproduced can be accurately restored.

  The optical disk 10 of the present embodiment is a CD-RW standard rewritable optical disk. In this case, the system controller 27 instructs the encoder 28 to restore the restored track (not shown) following step 208. Are overwritten in the PMA area of the optical disc 10 via the laser drive circuit 29 and the optical head 21.

  Also, the track address information when the track address information recorded in the PMA area of the optical disc 10 can be reproduced is stored, and the start time and end time of the track when the reproduction could not be performed due to a reproduction error. Can be overwritten in the entire PMA area of the optical disc 10 together with the address information of the track when the track address information can be reproduced and the start time and end time of the restored track. In this case, the start time and end time of the track can be restored on the optical disc 10 more easily and accurately.

  As a result, even an information recording / reproducing apparatus that does not have a restoring means for restoring accurate track start time and stop time can perform reproduction or additional recording, which is convenient.

1 is a block diagram showing a schematic configuration of a CD-RW drive apparatus which is an embodiment of an optical disc apparatus according to the present invention. It is a figure which shows the restoration operation | movement flow when the address information of the track currently recorded on the PMA area | region of the optical disk based on this invention has not been able to be reproduced | regenerated by the reproduction | regeneration error. It is a figure which shows an example of the layout of each area | region of an optical disk.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... CD-RW standard overwritable optical disk, 20 ... CD-RW drive apparatus, 21 ... Optical head, 22 ... Optical head feed mechanism, 23 ... RF amplifier, 24 ... Decoder, 25 ... External interface, 26 ... Buffer memory 27 ... System controller, 28 ... Encoder, 29 ... Laser drive circuit, 30 ... Spindle motor, 40 ... Host computer.

Claims (3)

  In an information recording / reproducing apparatus for recording and reproducing information in a program area of an optical disc, when the address information of a track recorded in the PMA area of the optical disc cannot be reproduced due to a reproduction error, the address of the track that could not be reproduced Of the information, the start time of the track is restored by acquiring the start time of the track in the TOC information recorded in the lead-in area of the optical disc, and the end position of the track is An information recording / reproducing apparatus comprising a restoring means for acquiring and restoring subcode Q data at a boundary with a track immediately thereafter.   In an information recording / reproducing apparatus for recording and reproducing information in an overwritable optical disc program area, when the address information of the track recorded in the PMA area of the optical disc could not be reproduced due to a reproduction error, the information could not be reproduced. Of the track address information, the track start time is restored by acquiring the track start time in the TOC information recorded in the lead-in area of the optical disc, and the track end position cannot be reproduced. Means for acquiring and restoring the subcode Q data at the boundary between the recorded track and the track immediately after it, and overwriting the PMA area of the optical disc with the start time and end time of the restored track. Information recording / reproducing apparatus. In an information recording / reproducing apparatus for recording and reproducing information in an overwritable optical disc program area, when the address information of the track recorded in the PMA area of the optical disc could not be reproduced due to a reproduction error, the information could not be reproduced. Of the track address information, the track start time is restored by acquiring the track start time in the TOC information recorded in the lead-in area of the optical disc, and the track end position cannot be reproduced. The subcode Q data at the boundary between the recorded track and the track immediately after it is acquired and restored, and the start time and end time of the restored track and the address information of the track recorded in the PMA area of the optical disc can be reproduced. The address information of the track at the time of recording on the PMA area of the optical disc. Information recording and reproducing apparatus comprising the sake means.

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