JP2000285461A - Method for judging invalid session of optical disk, method for obtaining track information thereon and optical disk apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent data of an erased old session from mistakenly being obtained by accessing a position corresponding to a start time of a lead-in area or a position appropriately set between positions, and judging the side of a disk outer circumference of a next session and thereafter as an invalid session when an HF signal cannot be obtained from the accessed position. SOLUTION: Start time information on a program area of a next session is read from a lead-in area of a session at the side of a disk inner circumference. A position corresponding to a start time of the program area, a position corresponding to a start time of a lead-in area of the next session specified to be a position a predetermined time before the start time of the program area, or a position appropriately set between the two positions is accessed. Whether or not an HF signal can be obtained from the accessed position is judged. When the HF signal cannot be obtained, the side of an outer circumference of the next session and thereafter is judged to be an invalid session.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for determining an invalid session
The present invention relates to a method for obtaining track information by ble of contents and an optical disc apparatus for implementing the methods, and to a multi-session recorded CD.
-Prevents erroneous acquisition of old session data that should have been erased from a rewritable optical disk such as a RW (compact disk rewritable).

[0002]

2. Description of the Related Art Multi-session recording is standardized as one of recording methods for CD-RW discs. This is because a combination of the lead-in area, the program area, and the lead-out area is regarded as one session, and a plurality of sessions are defined as one session.
This is recorded on a single disk. In each session, the lead-in area stores TOC information that is information of a track in each session. Although user data is stored in the program area, the path table in the previous session is often inherited here. In addition, recording is performed in such a manner that sessions are sequentially recorded from the inner circumference to the outer circumference of the disc.

Therefore, multi-session compatible optical disk devices (CD-ROM drive, CD-R drive,
In a CD-RW drive, etc., in order to obtain all track information and the latest user data information (a path table recorded in the last session), a lead-in area of the innermost circumference after the disc is loaded is acquired. When the Q subcode information is read and it is determined that the disc is a multi-session recorded disc, all the track information up to the last session is obtained, and then, in exchange with the host computer, the path table of the last session is obtained. A search is performed.

As a method of searching for all track information up to the last session, there is a method of successively reading the lead-in area of each session. That is, first, the TOC information of the lead-in area of the first session is read, and the program start time information of the second session obtained at this time is used as a clue to access the lead-in area of the second session. Then, the TOC information of the third session is read by accessing the lead-in area of the third session using the program start time information of the third session obtained at this time as a clue. In this way, the lead-in area of each session is sequentially accessed. Then, if there is no data in the lead-in area at the accessed location, it is determined as an unrecorded portion, and the session immediately before that is determined as the last session. When all the track information up to the last session is obtained, the host computer continuously searches the path table of the last session by exchanging with the drive.

A conventional erasing method for erasing the entire surface of a CD-RW disk is a full erase (Full E).
race and Quick Erase (Quick Eras)
e). Full erasure writes logic "0" over the entire surface, and has the advantage of completely erasing the recorded contents, but has the disadvantage of requiring a long erasing time. For example, when erasing a 74 minute disc at 1 × speed, 74
It will take more than a minute. On the other hand, quick erase is a PM that is on the inner peripheral side of the lead-in area of the first session.
A area (Program Memory Area: 1)
After the recording of the track of one session is completed, the information of the start time and the end time of each track in the session necessary for generating the TOC information of the session and recording it in the lead-in area of the session is written down. region. In the PMA area, information on the start time and end time of the tracks of all the currently valid sessions already completed is left as it is. ) And erase from the lead-in area of the first session to the pre-gap (information on the outer peripheral side is left as it is). When the PMA area and the lead-in area of the first session are erased, the multi-session compatible optical disc apparatus loaded with the CD-RW disc does not receive any information on tracks from the PMA area to be accessed first or from the lead-in area. Since it cannot be obtained, it is determined that the disk has all tracks erased. Therefore, the quick erase can achieve the same effect as the full erase by a short erasing operation.

[0006]

The data from the first track of the first session on the CD-RW disc on which the quick erasing has been performed is still left. Therefore, a problem may occur when a new multi-session recording is performed. is there. That is, when a CD-RW disc that has been quick erased and newly recorded up to the first session is loaded into the multi-session compatible optical disc apparatus, the optical disc apparatus starts from the lead-in area of the new first session to the start time of the program area of the second session. Information is acquired, and an address where the lead-in area of the second session should exist is accessed based on the information. At this time, if data of the old session before the quick erase remains at the accessed position, it may be erroneously obtained. In particular,
If it is the data of the lead-in area of the old session, the optical disc apparatus erroneously judges that the data is the data of the lead-in area of the second session, and the lead-in area of the old session is sequentially determined based on the data. By reading and reading, all the TOC information of the remaining old session is obtained, and the path table of the old last session is obtained based on the TOC information of the old last session. As a result, even though the new first session is recorded on the optical disc, there is no information corresponding to the new first session in the acquired path table. Inaccessible.
Further, even if an attempt is made to record a new second session, the recording cannot be continued immediately after the new first session.

[0007] The present invention solves the above-mentioned problems in the prior art, and prevents invalid data of an old session that should have been erased from being erroneously obtained from a rewritable optical disc on which multisession recording has been performed. And a track information acquisition method and an optical disc device.

[0008]

According to a first invalid session judging method of the present invention, start time information of a program area of a next session is read from a lead-in area of a session on an inner circumference side of a disk, and the program area start time is read. Accessing a corresponding position or a position corresponding to a start time of the lead-in area of the next session defined as a position before a predetermined time before the program area start time, or an appropriately determined position between these two positions, It is determined whether or not an HF signal can be obtained from the accessed position.
If no signal is obtained, the disc outer side after the next session is determined to be an invalid session.

According to a second invalid session determination method of the present invention, start time information of a program area of a next session is read from a lead-in area of a session on an inner side of a disk, and a position corresponding to the program area start time or the program is read. Access the position corresponding to the start time of the lead-in area of the next session, which is defined as the position before the area start time by a predetermined time, or an appropriately determined position between these two positions, and read from the accessed position It is determined whether or not the information to be obtained is configured in a logical erase format. If the information is configured in a logical erase format, the outer peripheral side of the disk after the next session is determined to be an invalid session.

According to a third invalid session determination method of the present invention, the start time information of the program area of the next session is read from the lead-in area of the session on the inner side of the disk, and the start time information is set as a position immediately before the program area start time by a predetermined time. Find the start time of the lead-in area of the specified next session, and access a position corresponding to the start time of the lead-in area or an appropriately determined position after the position and before the start position of the program area. Then, it is determined whether or not the information read from the accessed position is configured in the recording format of the lead-in area. If the information is not configured in the recording format of the lead-in area, the outer peripheral side of the disc is invalidated after the next session. The session is determined.

According to a fourth invalid session determination method of the present invention, the start time information of the program area of the next session is read from the lead-in area of the session on the inner circumference side of the disk, and the start time information is set as a position that is a predetermined time before the program area start time. Access a position corresponding to the specified start time of the lead-in area of the next session or a suitably determined position after the position and before the start position of the program area, and from the accessed position, The start time information of the first track of the session is read, and the difference between the start time information of the first track of the next session and the start time information of the program area read in the previous session is determined. It is determined whether the time difference is a predetermined time difference. One in which it is determined that the cushion.

According to a fifth invalid session determination method of the present invention, the last track number information of the session and the start time information of the program area of the next session are read from the lead-in area of the session on the inner peripheral side of the disc, and the start of the program area is started. Access a position corresponding to the start time of the lead-in area of the next session, which is defined as a position before a predetermined time before the time, or an appropriately determined position before the start position of the program area after the position. Determining whether the first track number of the next session included in the information read from the accessed position is continuous with the last track number of the previous session included in the information read in the previous session. If they are not consecutive, the disc outer side after the next session will be invalid. One in which it is determined that the Deployment.

According to a sixth method of determining an invalid session of the present invention, start time information of a program area of a next session is read from a lead-in area of a session on the inner circumferential side of the disk, and an appropriate minute time is calculated from the program area start time. Access to the previous position, trace from this position to a position corresponding to the program area start time or a position slightly later than the time, and record the lead-in area at the boundary of the program area start time. It is determined whether or not the format is switched to the recording format of the program area. If the format is not switched, the outer peripheral side of the disk after the next session is determined to be an invalid session. Note that the above determination methods can be used in an appropriate combination (that is, weighted determination conditions).

According to a first track information acquiring method of the present invention, the recording information is read from a lead-in area on the innermost circumference of the disc, and when the information includes start time information of a program area of a next session, A start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined, and a position corresponding to the lead-in area start time or a start position of the program area at or after the position. Access the appropriately determined position before, read the record information of the lead-in area of the next session from the accessed position,
This operation is repeated to successively read the lead-in area of each session and sequentially acquire the table of contents information of the disc. The first track information acquiring method is to determine whether an HF signal is obtained from the accessed position. Judge, H
If the F signal cannot be obtained, the reading and ending is ended at that point, and the table of contents information up to the previous session is obtained as valid information.

According to a second track information acquiring method of the present invention, it is determined whether or not information read from the accessed position is configured in a logical erase format.
In the case of the logical erasing format, the reading and ending is ended at that point, and the table of contents information up to the previous session is obtained as valid information. The third track information obtaining method of the present invention determines whether the information read from the accessed position is configured in a recording format of a lead-in area, and determines whether the information is not configured in a recording format of a lead-in area. Therefore, the reading and reading is ended, and the table of contents information up to the session before that is acquired as valid information.

According to a fourth track information obtaining method of the present invention, the start time information of the first track of the next session included in the information read from the accessed position and the start of the program area read in the previous session are included. The difference from the time is obtained, it is determined whether or not the difference is a predetermined time difference. If the difference is not the predetermined time difference, the reading and reading is ended there, and the table of contents information up to the session before that is obtained as valid information. .

According to a fifth track information acquiring method of the present invention, the first track number of the next session included in the information read from the accessed position is included in the information read in the previous session. It is determined whether the last track number of the session is continuous or not, and if not continuous, the reading is terminated and the table of contents information up to the previous session is obtained as valid information. The sixth track information acquisition method is as follows.
Prior to or after reading the record information of the lead-in area of the next session, the program accesses a position immediately before the program area start time by an appropriate minute time, and from this position, a position corresponding to the program area start time or Trace is performed over an appropriate minute time later than the time, and it is determined whether or not the recording format is switched from the recording format of the lead-in area to the recording format of the program area after the start time of the program area. End reading,
The table of contents information up to the previous session is acquired as valid information. In each track information acquisition method, after the table of contents information is obtained, a location where the path table of the last session in which the table of contents information is validated is accessed by exchanging with the host computer, and the path table is obtained. Can also be obtained.

In the first optical disk apparatus of the present invention, at an appropriate time after the disk is loaded, the lead-in area on the innermost periphery of the disk is accessed to read the recorded information, and the information is stored in the information of the next session. It is determined whether or not the start time information of the area is included. If the information is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is obtained. A position corresponding to the start time of the lead-in area or an appropriately determined position before the start position of the program area after the position is accessed, and recording information of the lead-in area of the next session is obtained from the accessed position. Is read, and this operation is repeated to successively read the lead-in area of each session to sequentially obtain the table of contents information of the disc. To, when accessing the position determined appropriately in front than the starting position of the program area at the position or the position after corresponding to the lead-in area start time of the next session, H from a position the access
A control unit for determining whether an F signal can be obtained, and in a case where an HF signal cannot be obtained, ending the reading and reading therefrom, and having a control unit for performing control to obtain the table of contents information up to the session before the valid information as valid information; Is what it is.

The second optical disk device of the present invention accesses the lead-in area on the innermost circumference of the disk and reads the recorded information at an appropriate time after the disk is loaded, and stores the information in the next session. It is determined whether or not the start time information of the area is included. If the information is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is obtained. A position corresponding to the start time of the lead-in area or an appropriately determined position before the start position of the program area after the position is accessed, and recording information of the lead-in area of the next session is obtained from the accessed position. Is read, and this operation is repeated to successively read the lead-in area of each session to sequentially obtain the table of contents information of the disc. The information read from the accessed position when the user accesses a position corresponding to the lead-in area start time of the next session or an appropriately determined position before the start position of the program area after the position. Is configured to determine whether or not is configured in the logical erase format, and if it is configured in the logical erase format, ends the read-through and controls to obtain the table of contents information up to the previous session as valid information Part.

In the third optical disk apparatus of the present invention, at an appropriate time after the disk is loaded, the innermost peripheral lead-in area is accessed to read the recorded information, and the information of the next session is stored in the information. It is determined whether or not the start time information of the area is included. If the information is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is obtained. A position corresponding to the start time of the lead-in area or an appropriately determined position before the start position of the program area after the position is accessed, and recording information of the lead-in area of the next session is obtained from the accessed position. Is read, and this operation is repeated to successively read the lead-in area of each session to sequentially obtain the table of contents information of the disc. The information read from the accessed position when the user accesses a position corresponding to the lead-in area start time of the next session or an appropriately determined position before the start position of the program area after the position. Is determined in the recording format of the lead-in area, and if it is not configured in the recording format of the lead-in area, the read-through is ended there, and the table of contents information up to the session before that as valid information. It is provided with a control unit for performing control to acquire.

According to a fourth optical disk apparatus of the present invention, at an appropriate time after the disk is loaded, the lead-in area on the innermost circumference of the disk is accessed to read the recorded information, and the information is stored in the information of the next session. It is determined whether or not the start time information of the area is included. If the information is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is obtained. A position corresponding to the start time of the lead-in area or an appropriately determined position before the start position of the program area after the position is accessed, and recording information of the lead-in area of the next session is obtained from the accessed position. Is read, and this operation is repeated to successively read the lead-in area of each session to sequentially obtain the table of contents information of the disc. The information read from the accessed position when the user accesses a position corresponding to the lead-in area start time of the next session or an appropriately determined position before the start position of the program area after the position. The difference between the start time information of the first track of the next session included in the next session and the program area start time read in the previous session is determined, and it is determined whether or not the difference is a predetermined time difference. In such a case, a control unit is provided which performs control to end the reading and reading and obtain the table of contents information up to the session before that as valid information.

According to a fifth optical disk apparatus of the present invention, at an appropriate point in time after a disk is loaded, a lead-in area on the innermost circumference of the disk is accessed and its recorded information is read, and the information of the next session is stored in the information. It is determined whether or not the start time information of the area is included. If the information is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is obtained. A position corresponding to the start time of the lead-in area or an appropriately determined position before the start position of the program area after the position is accessed, and recording information of the lead-in area of the next session is obtained from the accessed position. Is read, and this operation is repeated to successively read the lead-in area of each session to sequentially obtain the table of contents information of the disc. The information read from the accessed position when the user accesses a position corresponding to the lead-in area start time of the next session or an appropriately determined position before the start position of the program area after the position. It is determined whether the first track number of the next session included in the information contained in the previous session is continuous with the last track number of the previous session included in the information read in the previous session. It is provided with a control unit for performing control for ending the joining and acquiring the table of contents information up to the session before the joining as valid information.

According to a sixth optical disk apparatus of the present invention, at an appropriate time after the disk is loaded, the innermost peripheral lead-in area is accessed to read the recorded information, and the information is stored in the information of the next session. It is determined whether or not the start time information of the area is included. If the information is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is obtained. A position corresponding to the start time of the lead-in area or an appropriately determined position before the start position of the program area after the position is accessed, and recording information of the lead-in area of the next session is obtained from the accessed position. Is read, and this operation is repeated to successively read the lead-in area of each session to sequentially obtain the table of contents information of the disc. Prior to or after reading the record information of the lead-in area of the next session, an appropriate short time before the program area start time is accessed, and a position corresponding to the program area start time from this position is accessed. Alternatively, the trace is performed over an appropriate minute time after the time, and it is determined whether or not the recording format is switched from the recording format of the lead-in area to the recording format of the program area after the start time of the program area. Is provided with a control unit for controlling to end the reading and reading and obtain the table of contents information up to the previous session as valid information.

In each of the optical disk devices, after the table of contents information is obtained, the position where the path table of the last session in which the table of contents information is validated is accessed by exchange with the host computer, and You can get a table. In the present invention, a session refers to a block composed of a lead-in area, a program area, and a lead-out area.

In the case of a CD-RW disc, currently effective track information is recorded in a PMA area. Therefore, in the case of a recordable drive such as a CD-R / RW drive that reads the PMA area, it is considered that the track information read from the PMA area can be effectively used to determine whether the session is valid or invalid. In contrast, C
In the case of a read-only drive such as a D-ROM drive or a DVD-ROM drive, generally, information in the PMA area cannot be used for determining whether a session is valid or invalid.
Considering this point, the present invention can determine the validity / invalidity of the session without using the information in the PMA area.
In particular, it is highly applicable to a read-only drive that does not have a function of reproducing the PMA area. However, CD-R / R
Even in a recordable drive such as a W drive (and also in a read-only drive having a function of reproducing the PMA area), the determination method of the present invention is used alone or based on information read from the PMA area. The validity / invalidity of the session can be determined together with the determination.

[0026]

Embodiments of the present invention will be described below. Here, the present invention is applied to a multi-session C
C such as D-ROM drive, DVD-ROM drive, etc.
A case will be described in which the present invention is applied to an optical disk device having a read-only drive capable of reproducing a D-RW disk and not reading a PMA area. The multi-session compatible CD-ROM drive is a CD-DA,
-R, CD-RW, and CD-ROM discs can be reproduced. The DVD-ROM drive can additionally reproduce a DVD-ROM disc.

First, the format of a multi-session of the CD-RW will be briefly described. As shown in FIG. 2, the recording area of the optical disc on which multi-session recording is performed is configured from the inner circumference side into a PMA area, a first session, a second session, a third session, and so on. Each session has a lead-in area (L
I), a program area (PGM), and a lead-out area (LO). The TOC information of the session is recorded in the lead-in area. Further, a path table is recorded in each session. In the path table of each session, directory information on tracks of the own session and all sessions on the inner side thereof is recorded. Therefore, if the path table of the last session is obtained, any track of all sessions can be accessed.

The lead-in area of the first session is set at a position 23 to 25 mm from the center of the disc. In addition, the length of the lead-out area of the first session is defined as 01 minutes, 30 seconds, and 00 frames (hereinafter referred to as 01:30:00). In the second and subsequent sessions, the length of the lead-in area is set to 01: 00: 0, and the length of the lead-out area is set to 00:30:30.

FIG. 3 shows the Q subcode format of each lead-in area. TNO is the lead-in area
= 0. The multi-session recording is performed when the ADR = 5 (mode 5) for the CD-R disc and the CD-ROM disc.
It can be seen from the existence of the state of INT = B0. In the case of a CD-RW disc, ADR = 5 (mod
TIME at POINT = B0 in e5) is FF: F
F: It can be understood from a value other than FF. ADR =
5, TIME when POINT = B0 (FF: FF:
The value other than FF) indicates the start time of the program area of the next session. Also, P when POINT = 1 to 99
TIME represents the start time of the track number represented by the POINT value. PMI when POINT = A0
N represents the first track number of the session. PO
PMIN when INT = A1 indicates the last track number of the session. PT when POINT = A2
IME represents the start time of the lead-out area of the session.

FIG. 4 shows the Q subcode format of the program area and the lead-out area of each session. Whether the area is a program area or a lead-out area can be identified by TNO # 0. TNO in the program area indicates the track number at that position. In the lead-out area, TNO = AA (h). A section of INDEX = 0 is provided as a pregap between 00:02:00 from the start position of the program area. Therefore, the first track of the session is recorded after 00:02:00 from the start position of the program area. TIM
E is the relative time within the track, ATIME is the absolute time from the start of the program area in the first session,
A value corresponding to the time information recorded as ATIP is recorded in the pregroove.

Recording on a CD-RW disc is performed by sequentially writing tracks from the inner circumference to the outer circumference in the program area. Until the recording of one session is completed, each time recording is interrupted, the information of the previous tracks (information on the start time and end time of each track necessary for generating TOC information) is temporarily written in the PMA area. And accumulate sequentially. When the recording of one session is completed, the lead-in area is recorded based on the stored information, and further, the path table and the lead-out area are recorded to complete the recording of the session.

Quick erasing of a CD-RW disc is usually performed by recording erase data in the PMA area, the lead-in area of the first session, and the pre-gap of the first session in the respective erase formats. Data on the outer side of the pre-gap of the first session (that is, the first track to the outer side) is left as it is.

FIG. 5 shows an example of a system configuration of an optical disk apparatus to which the present invention is applied. This is a multi-session compatible CD-ROM drive, DVD-ROM drive, etc., a read-only optical disk drive 10 capable of reproducing a CD-RW disc, and a host computer 1 such as a personal computer.
2. Combination with 2. Optical discs (CD-DA,
CD-R, CD-RW, CD-ROM, DVD-ROM
Etc.) 14 are driven by a spindle motor 16 and information is reproduced by an optical pickup 18. The optical pickup 18 is transported in the radial direction of the optical disk 14 by a feed motor 20. The data of the optical disk 14 read by the optical pickup 18 is transmitted to the EFM / C
EFM demodulation and error correction processing are performed by the IRC decoder 24. The demodulated data is temporarily stored in a buffer memory 28 via a memory control unit 26, read out according to an internal reference clock to absorb jitter, and then transmitted to the host computer 12 via an interface unit 30. Can be

The servo controller 32 performs constant linear velocity control of the spindle motor 16, focus control of the optical pickup 18, tracking control, and feed control of the feed motor 20 based on the output signal of the RF amplifier 22. The system control unit 34 controls the optical disk drive 10 to execute the commands and the like based on the commands and the like from the host computer 12.
Control of each part in. The control unit of the optical disk device according to the present invention is constituted by a combination of the host computer 12 and the system control unit 34 shown in FIG.

(Initial Operation Example 1) Optical Disk Drive 10
FIG. 1 shows an example of control of the initial operation (read operation of track information) when the optical disk 14 is loaded in the optical disc 14. In FIG. 1, each symbol represents the following. SES: current session number SES-1: current previous session number TNO: acquired track number First TNO: first track number of session Last TNO: last track number of session B0 pointer: Q sub in lead-in area Start time information of the program area of the next session given by TIME when the code is ADR = 5 (mode 5) and POINT = B0

In the control shown in FIG. 1, the optical disk drive 10 controls the optical disk 14
Is loaded and is spontaneously implemented. The reading of the path table is performed by the host computer 12 and the optical disk drive 14 in the form of data transmission for a command through an interface.

The optical disk drive 10 has an optical disk 14
Is loaded, the loading is detected by detecting means (not shown) in the optical disk drive 10 (S1). When the loading of the optical disk 14 is detected, the optical pickup 18 is moved to the innermost lead-in area (46 to 50 from the center of the disk).
It is fixedly defined as the area of mm. ) (S2), and attempts to read the TOC information (S3). It is determined whether or not TOC information can be obtained (S4). If not, the initial operation ends (S4).
5). When the TOC information is obtained, the session number is set to 1 (S6).

When the reading of the TOC information of the first session is completed, it is determined whether or not the multi-session recording is performed based on the information (S7). The multi-session recording means that, in the case of a CD-R disc and a CD-ROM disc, PDR is set when ADR = 5 (mode 5).
It can be seen from the existence of the state of OINT = B0. In the case of a CD-RW disc, ADR = 5 (mod
TIME at POINT = B0 in e5) is FF: F
F: It can be understood from a value other than FF. If it is determined that the recording is not the multi-session recording, the optical pickup 18 is moved to the position where the path table of the first session is recorded (the head position of the program area) to read the path table (S8), and the initial operation is started. End (S
5). In the case of a single session, the initial operation ends here.

If it is determined that the recording is the multi-session recording, the session number is incremented by 1 (S9). The second session already obtained from the TOC information of the first session
Start time information of the program area of the session (B0 p
pointer (SES-1)), access to a position (a position considered to be within the lead-in area of the second session) a predetermined time (for example, 2 seconds before) the start time, and start tracing therefrom; Attempt to acquire the Q subcode of the second session (S10). This trace is
To the position corresponding to the start time information of the program area of the session (or to a position that is a predetermined time later than that)
Done. Based on the result of the trace, it is determined whether or not the Q subcode has been acquired, and the format of the reproduction information is changed from the format of the lead-in area to the program area at a position corresponding to the start time information of the program area of the second session. Is determined (S11). Whether the format of the reproduction information has been switched from the format of the lead-in area to the format of the program area can be determined by, for example, the TNO of the Q subcode. That is, since TNO = 0 in the lead-in area and TNO ≠ 0 in the program area and the lead-out area, TNO changes from 0 to a value other than 0 at a position corresponding to the start time information of the program area in the second session. Can be determined.

If the Q subcode is not obtained as a result of the determination in step S11, or the format of the reproduction information is changed from the format of the lead-in area to the program area at a position corresponding to the start time information of the program area of the second session. If the format has not been switched to the previous session, it is considered to be a remaining area of the old session or the like. Therefore, the second session is determined to be an invalid session, and the path table of the first session which is the last session determined to be valid up to that time Is read (S8), and the initial operation ends (S5).

As a result of the determination in step S11, a Q subcode is obtained, and the format of the reproduction information is switched from the format of the lead-in area to the format of the program area at a position corresponding to the start time information of the program area in the second session. In the case of a change, access is made to the start position of the lead-in area of the second session (the position of the value obtained by subtracting 01: 00: 0 from the start time of the program area of the second session), and an attempt is made to read the TOC information ( S
12). There, it is first checked whether an HF signal can be obtained (S13).
Since the session is considered to be incomplete, the second session is determined to be an invalid session, the path table of the first session, which is the last session determined to be valid, is read (S8), and the initial operation ends. Do (S
5).

On the other hand, when the HF signal is obtained, the Q subcode is read (S14). Then, the format of the read Q subcode is checked (S15, S1).
6) In the case of the logical erase format or the format of the program area or the lead-out area, the second session is determined to be an invalid session, and the track information acquired in the lead-in area of the second session is discarded (S17). Then, the path table of the first session, which is the last session determined to be valid, is read (S8), and the initial operation is terminated (S5).

In other cases, that is, in the case of the non-erasing format of the lead-in area, the TOC information is obtained as it is (S18). At this time, the continuity check between each track number TNO included in the TOC information and the last track number of the preceding first session is performed. That is, each time the track number TNO is obtained from the TOC information, the track number is compared with the last track number of the first session (S1).
9) If the last track number of the first session is equal to or smaller than the last track number, the second session is determined to be an invalid session. In this case, the TOC information acquired in the lead-in area of the second session is discarded (S
17), the path table of the first session, which is the last session determined to be valid, is read (S8), and the initial operation ends (S5).

On the other hand, when it is determined that all the track numbers TNO included in the obtained TOC information are higher than the last track number of the session before the current one (S2).
0) further compares the last track number of the first session with the first track number of the second session (S).
21). If the value obtained by adding 1 to the last track number of the first session is smaller than the first track number of the second session, the last track number of the first session and the first track number of the second session are discontinuous. Therefore, the TOC information acquired in the lead-in area of the second session is discarded (S17), and the path table of the first session, which is the last session determined to be valid, is read ( S8), the initial operation ends (S5).

On the other hand, if the value obtained by adding 1 to the last track number of the first session is not smaller than the first track number of the second session, the last track number of the first session and the first track number of the second session It is determined that the pre-gap length of the second session is the specified 00:02:00 (S22). This pregap length is obtained as the difference between the start time of the first track of the second session and the start time of the program area of the second session. The start time of the first track of the second session is determined by the POI of the Q subcode in the lead-in area of the second session.
The first track number of the second session given by NT = A0 is given as PTIME when the value of POINT is the same track number. The start time of the program area of the second session is given by TIME when the Q subcode of the lead-in area of the first session is ADR = 5 and POINT = B0. Therefore, by calculating the difference between these PTIME and TIME,
Check if it is the specified 00:02:00.

As a result, if the difference is not 00:02:00, the second session is determined to be an invalid session, and the track information obtained in the lead-in area of the second session is discarded (S17). The path table of the first session, which is the last session determined to be valid, is read (S8), and the initial operation ends (S5). On the other hand, if the difference is 00:02:00, it is determined that the second session is valid, and the above determination operation is repeated for each session after the third session. As a result, all TOC information up to the previous session determined to be invalid (until the last session determined to be valid) and the path table of the last session determined to be valid are acquired, and a storage device in the host computer 12 or the like is obtained. Is stored.

When the initial operation is completed and access to an arbitrary track is instructed by an operation of the operator or the like, access to the corresponding track is executed based on the obtained information, and information of the track is obtained. Is read.

In the above-described embodiment, the position corresponding to the start time of the lead-in area of the next session is determined based on the start time information of the program area of the next session read from the Q subcode of the lead-in area. The information necessary for validity / invalidity and the track information are acquired from the lead-in area by accessing (from step S12 in FIG. 1), but the invention is not limited to this, and the start of the lead-in area of the next session is started. The information can also be obtained by accessing an appropriately determined position (intermediate position in the lead-in area) before the start position of the program area of the next session after the position.

Further, the control unit (system control unit 34, host computer 12) of the optical disk device determines the validity / invalidity by weighting or replacing another condition with the method described in the above embodiment. Can be. For example,
Based on the start position information of the program area of the next session read from the Q subcode of the lead-in area, prior to accessing the lead-in area of the next session and acquiring the track information (or acquiring the track information). (After) accessing the start position of the program area of the next session to determine the presence / absence of an HF signal, the presence / absence of an erase format, or the presence / absence of a format of the program area; If there is no format, the next session is determined to be an invalid session. At this time, it is also possible to actually measure the length of the section of INDEX = 0 and determine whether the section is valid or invalid based on whether 00:02:00. When it is determined that the track information of the next session has already been acquired, the track information of the next session is discarded. Before the track information of the next session is obtained, the track information of the next session is not obtained. If it is not determined to be invalid, if the track information of the next session has already been obtained, the next session is accessed on condition that other conditions are also satisfied. Before the track information of the next session is obtained, the start position of the lead-in area of the next session or the intermediate position in the lead-in area is accessed to obtain the track information of the next session and Then, other conditions relating to the next session are determined.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of a track information acquisition method according to the present invention.

FIG. 2 is a schematic diagram showing a divided state of each area of an optical disc on which multi-session recording is performed.

FIG. 3 is a diagram showing a Q subcode format of a lead-in area according to the CD standard.

FIG. 4 is a diagram showing a Q subcode format of a program area and a lead-out area according to the CD standard.

FIG. 5 is a system configuration block diagram showing an embodiment of the optical disk device of the present invention.

[Explanation of symbols]

10, 12 optical disk device (optical disk drive, host computer), 14 optical disk, 12, 34 ...
Control unit (host computer, system control unit).

Claims (19)

[Claims] An information processing apparatus reads start time information of a program area of a next session from a lead-in area of a session on an inner circumference side of a disk, and determines the start time information as a position corresponding to the program area start time or a position before a predetermined time before the program area start time. Accessing a position corresponding to the start time of the lead-in area of the specified next session or an appropriately determined position between these two positions, and determining whether an HF signal can be obtained from the accessed position; An invalid session determination method for an optical disc in which if the HF signal is not obtained, the outer peripheral side of the disc is determined to be an invalid session after the next session. 2. The start time information of the program area of the next session is read from the lead-in area of the session on the inner circumference side of the disk, and the start time information is read as a position corresponding to the start time of the program area or a position immediately before the start time of the program area. A position corresponding to the specified start time of the lead-in area of the next session or an appropriately determined position between these two positions is accessed, and information read from the accessed position is configured in a logical erase format. An invalid session determination method for an optical disk which determines whether or not the disk outer peripheral side is an invalid session after the next session if it is determined whether the disk is in a logical erase format. 3. The start time information of the program area of the next session is read from the lead-in area of the session on the inner circumference side of the disk, and the lead-in of the next session is defined as a position that is a predetermined time before the program area start time. Information obtained by obtaining a start time of an area, accessing a position corresponding to the start time of the lead-in area or an appropriately determined position after the position and before the start position of the program area, and reading from the accessed position Discriminating whether or not the disc is configured in a recording format of the lead-in area. If the disc is not configured in the recording format of the lead-in area, the disc outer periphery side is determined to be an invalid session after the next session. . 4. A start time information of a program area of a next session is read from a lead-in area of a session on an inner circumferential side of the disk, and a lead-in of the next session is defined as a position a predetermined time before the start time of the program area. A position corresponding to the start time of the area or an appropriately determined position before the start position of the program area after the position is accessed, and the start time information of the first track of the next session is accessed from the accessed position. reading,
A difference between the start time information of the first track of the next session and the start time information of the program area read in the previous session is determined, and it is determined whether the difference is a predetermined time difference. Is a method for determining an invalid session of an optical disc that determines the outer peripheral side of the disc as an invalid session after the next session. 5. The program reads the last track number information of the session and the start time information of the program area of the next session from the lead-in area of the session on the inner peripheral side of the disk, and defines the information as a position that is a predetermined time before the program area start time. Access to a position corresponding to the start time of the lead-in area of the next session or an appropriately determined position before the start position of the program area after the position, and the information read from the accessed position. It is determined whether or not the first track number of the next session included is continuous with the last track number of the previous session included in the information read in the previous session, and if not, the next session is determined. An invalid session of the optical disc that determines the disc outer side as an invalid session thereafter Constant method. 6. The start time information of the program area of the next session is read from the lead-in area of the session on the inner circumference side of the disc, and a position slightly shorter than the start time of the program area is accessed. Trace over a position corresponding to the area start time or a position slightly later than the time, and determine whether the recording format is switched from the lead-in area recording format to the program area recording format at the program area start time. An invalid session determination method for an optical disc in which, when the switching is not performed, the outer peripheral side of the disc is determined to be an invalid session after the next session. 7. The recording information is read from the lead-in area on the innermost circumference of the disk, and when the information includes the start time information of the program area of the next session, a predetermined time before the start time of the program area. A start time of the lead-in area of the next session defined as a position is obtained, and a position corresponding to the start time of the lead-in area or a position appropriately determined before the start position of the program area after the position. And reading the record information of the lead-in area of the next session from the accessed position, repeating this operation to read over the lead-in area of each session, and sequentially obtain the index information of the disc. It is determined whether or not the HF signal is obtained from the accessed position. Exit and track information acquisition method of the optical disc to retrieve the table of contents information to the front session as valid information. 8. The recording information is read from the lead-in area on the innermost circumference of the disc, and when the information includes the start time information of the program area of the next session, a predetermined time before the program area start time. A start time of the lead-in area of the next session defined as a position is obtained, and a position corresponding to the start time of the lead-in area or a position appropriately determined before the start position of the program area after the position. And reading the record information of the lead-in area of the next session from the accessed position, repeating this operation to read over the lead-in area of each session, and sequentially obtain the index information of the disc. Determining whether the information read from the accessed location is in a logical erase format, When configured in formatted exit joint reading there, the track information acquisition method of the optical disc to retrieve the table of contents information to the front session as valid information. 9. The recording information is read from the lead-in area on the innermost circumference of the disk, and when the information includes the start time information of the program area of the next session, a predetermined time before the start time of the program area. A start time of the lead-in area of the next session defined as a position is obtained, and a position corresponding to the start time of the lead-in area or a position appropriately determined before the start position of the program area after the position. And reading the record information of the lead-in area of the next session from the accessed position, repeating this operation to read over the lead-in area of each session, and sequentially obtain the index information of the disc. Whether the information read from the accessed position is in the recording format of the lead-in area. Sectional, and leads if in-area recording format not configured to exit the joint reading there, the track information acquisition method of the optical disc to retrieve the table of contents information to the front session as valid information. 10. The recording information is read from the lead-in area on the innermost circumference of the disk, and when the information includes the start time information of the program area of the next session, a predetermined time before the start time of the program area. A start time of the lead-in area of the next session defined as a position is obtained, and a position corresponding to the start time of the lead-in area or a position appropriately determined before the start position of the program area after the position. And reading the record information of the lead-in area of the next session from the accessed position, repeating this operation to read over the lead-in area of each session, and sequentially obtain the index information of the disc. The start time information of the first track of the next session included in the information read from the accessed position, and A difference from the program area start time read in the previous session is determined, and it is determined whether the difference is a predetermined time difference. If the difference is not the predetermined time difference, the reading is ended there, and the table of contents up to the previous session is determined. A method of acquiring track information of an optical disc for acquiring information as valid information. 11. The recording information is read from the lead-in area on the innermost circumference of the disk, and when the information includes the start time information of the program area of the next session, a predetermined time before the program area start time. A start time of the lead-in area of the next session defined as a position is obtained, and a position corresponding to the start time of the lead-in area or a position appropriately determined before the start position of the program area after the position. And reading the record information of the lead-in area of the next session from the accessed position, repeating this operation to read over the lead-in area of each session, and sequentially obtain the index information of the disc. , The first track number of the next session included in the information read from the accessed position is the previous track number. Judge whether the last track number of the previous session included in the information read in the session is continuous, and if it is not continuous, stop the reading and then make the table of contents information up to the previous session valid For obtaining track information of an optical disc that is obtained as important information. 12. The recording information is read from the lead-in area on the innermost circumference of the disk, and when the information includes the start time information of the program area of the next session, a predetermined time before the program area start time. A start time of the lead-in area of the next session defined as a position is obtained, and a position corresponding to the start time of the lead-in area or a position appropriately determined before the start position of the program area after the position. And reading the record information of the lead-in area of the next session from the accessed position, repeating this operation to read over the lead-in area of each session, and sequentially obtain the index information of the disc. Before or after reading the record information of the lead-in area of the next session,
Accessing a position that is an appropriate minute before the program area start time, and tracing from the position to a position corresponding to the program area start time or a position that is an appropriate minute after the time, and tracing the program area start time It is determined whether the recording format is switched from the recording format in the lead-in area to the recording format in the program area at the boundary.If not, the reading is terminated and the table of contents information up to the previous session is used as valid information. A method of acquiring track information of an optical disc to be acquired. 13. The method according to claim 7, further comprising, after obtaining the table of contents information, accessing a position where a path table of the last session in which the table of contents information is validated is recorded to obtain the path table. 2. The method for acquiring track information of an optical disc according to item 1. 14. At an appropriate point in time after the disk is loaded, the lead-in area on the innermost circumference of the disk is accessed to read the recorded information, and the information includes the start time information of the program area of the next session. Is determined, and if it is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined to be equivalent to the lead-in area start time. Access to a predetermined position before or after the start position of the program area at or after the start position, read the record information of the lead-in area of the next session from the accessed position, and repeat this operation. By reading the lead-in area of each session and sequentially acquiring the table of contents information of the disc, the lead-in area of the next session is obtained. When accessing a position corresponding to the region start time or a suitably determined position before the start position of the program region after the position, it is determined whether an HF signal is obtained from the accessed position, An optical disc apparatus comprising a control unit for controlling to end reading and reading when the HF signal is not obtained and to obtain the table of contents information up to the session before that as valid information. 15. At an appropriate point in time after a disc is loaded, an innermost lead-in area of the disc is accessed to read recorded information, and the information includes start time information of a program area of the next session. Is determined, and if it is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined to be equivalent to the lead-in area start time. Access to a predetermined position before or after the start position of the program area at or after the start position, read the record information of the lead-in area of the next session from the accessed position, and repeat this operation. By reading the lead-in area of each session and sequentially acquiring the table of contents information of the disc, the lead-in area of the next session is obtained. When an access is made to a position corresponding to the region start time or a suitably determined position before the start position of the program region after the position, information read from the accessed position is configured in a logical erase format. An optical disc apparatus having a control unit for judging whether or not there is a logical erasing format, ending the reading and reading there, and acquiring the table of contents information up to the session before that as valid information . 16. At an appropriate point in time after the disc is loaded, an innermost lead-in area of the disc is accessed to read the recorded information, and the information includes the start time information of the program area of the next session. Is determined, and if it is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined to be equivalent to the lead-in area start time. Access to a predetermined position before or after the start position of the program area at or after the start position, read the record information of the lead-in area of the next session from the accessed position, and repeat this operation. By reading the lead-in area of each session and sequentially acquiring the table of contents information of the disc, the lead-in area of the next session is obtained. When an access is made to a position corresponding to the area start time or an appropriately defined position before the start position of the program area after the position, information read from the accessed position is stored in the recording format of the lead-in area. Determine whether it is configured,
An optical disc device comprising a control unit for performing control to end read-through when the recording format is not configured in the recording format of the lead-in area and to acquire the table of contents information up to the preceding session as valid information. 17. At an appropriate point in time after the disc is loaded, the innermost lead-in area of the disc is accessed to read the recorded information, and the information includes the start time information of the program area of the next session. Is determined, and if it is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined to be equivalent to the lead-in area start time. Access to a predetermined position before or after the start position of the program area at or after the start position, read the record information of the lead-in area of the next session from the accessed position, and repeat this operation. By reading the lead-in area of each session and sequentially acquiring the table of contents information of the disc, the lead-in area of the next session is obtained. When accessing a position corresponding to the region start time or an appropriately determined position before the start position of the program region after the position, the start of the next session included in the information read from the accessed position The difference between the start time information of the track and the program area start time read in the previous session is determined, it is determined whether or not the difference is a predetermined time difference. An optical disc apparatus including a control unit for performing control to obtain table of contents information up to a session before the information as valid information. 18. At an appropriate point in time after a disc is loaded, a read-in area is accessed by accessing an innermost lead-in area of the disc, and the information includes start time information of a program area of the next session. Is determined, and if it is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined to be equivalent to the lead-in area start time. Access to a predetermined position before or after the start position of the program area at or after the start position, read the record information of the lead-in area of the next session from the accessed position, and repeat this operation. By reading the lead-in area of each session and sequentially acquiring the table of contents information of the disc, the lead-in area of the next session is obtained. When accessing a position corresponding to the region start time or an appropriately determined position before the start position of the program region after the position, the start of the next session included in the information read from the accessed position It is determined whether or not the track number of the previous session is continuous with the last track number of the previous session included in the information read in the previous session. An optical disc device including a control unit for controlling acquisition of table of contents information up to a session as valid information. 19. At an appropriate point in time after the disc is loaded, the recording information is read by accessing the innermost lead-in area of the disc, and the information includes the start time information of the program area of the next session. Is determined, and if it is included, the start time of the lead-in area of the next session, which is defined as a position before the program area start time by a predetermined time, is determined to be equivalent to the lead-in area start time. Access to a predetermined position before or after the start position of the program area at or after the start position, read the record information of the lead-in area of the next session from the accessed position, and repeat this operation. By reading the lead-in area of each session and sequentially acquiring the table of contents information of the disc, the lead-in area of the next session is obtained. Prior to or after reading the recording information of the area, a position that is an appropriate minute time before the program area start time is accessed, and a position corresponding to the program area start time or an appropriate minute time less than the time is accessed from the position. Trace to the position after time,
It judges whether or not the recording format is switched from the recording format of the lead-in area to the recording format of the program area at the boundary of the program area start time. An optical disc device including a control unit that performs control to obtain the information as valid information.