JPH05174386A - Optical disk reproducing method - Google Patents

Abstract

PURPOSE:To increase the range of applications of a write once type disk by identifying the unrecorded, partial recorded and recorded states of an optical disk respectively and performing the access and reproducing operations for a partly recorded disk based on the data on a PMA. CONSTITUTION:When a write once type disk 1 is reproduced, the access and reproducing operations are applied to the head of a lead-in area of the disk 1 by an optical pickup 2. Then an unrecorded/recorded state identifying circuit 15 decides an unrecorded or recorded state according to a fact whether an EFM signal is included in an RF signal or not. If not, i.e., a complete unrecorded or partly recorded state is decided, the switches 12 and 13 are switched toward a terminal (b) and the revolution of the disk 1 is controlled by the data on an ATIP. Then an access is applied to the head of a PMA and a partial recorded state is decided if the data are written into the disk 1. These data are stored in a memory 16 and used as the lead-in data. Thus the access is possible to each track and the access and reproducing operations are attained like a recorded disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when reproducing an optical disk, identifies whether the optical disk is in a non-recorded state, a partially recorded state or a recorded state, and makes it possible to reproduce the partially recorded disc. It relates to a reproducing method.

[0002]

2. Description of the Related Art Conventionally, in the reproducing method of an optical disc of this type, the data in the lead-in area of the optical disc is reproduced, and the start time of the track for all tracks (music songs, data) recorded on the optical disc. ,
The number of tracks, the time when the last track ends, that is, the table of contents of the same disc is read out, and each read-out data is used to reproduce each track.

[0003]

By the way, in the above-mentioned optical disk reproducing method, in the case of an optical disk in which data is not written in the lead-in area, the optical disk cannot be reproduced.

Therefore, for example, in the case of a write-once disc,
As shown in FIG. 3, there are a completely unrecorded state, a partially recorded state due to additional recording, and a recorded state due to the end of additional recording, but there is a drawback that the disc in the partially recorded state cannot be reproduced.

That is, in the case of the write-once disc 1, additional write can be performed up to 99 times from the standard, and when the last write-once is completed, the information of all tracks is recorded in the lead-in area of the write-once disc. This is because no information is recorded in the lead-in area in the unrecorded or partial recording of the write-once disc 1 (shown in FIG. 3).

When the additional recording disk 1 in the partially recorded state is reproduced, the additional recording space (the user area shown in FIG. 3) is present even though the additional recording disk 1 still exists.
Write data to the lead-in area of the same disc 1
Must be recorded, and a large capacity (eg 54
In some cases, an optical disk of 0 MB) cannot be used effectively.

The present invention has been made in view of the above problems, and an object thereof is to reproduce a partially recorded disc, that is, in the midst of additional recording, thereby expanding the use of the additional recording disc. Another object of the present invention is to provide a method of reproducing the optical disc.

[0008]

In order to achieve the above object, the reproducing method of an optical disk of the present invention, when reproducing the optical disk, accesses and reproduces the lead-in area of the optical disk and changes the recording state of the lead-in area. Whether the optical disc is in a non-recorded state or a recorded state is discriminated. If the optical disc is not in the recorded state, the PMA is accessed and reproduced by the ATIP data of the optical disc, and the optical disc is discriminated by the recorded state of the PMA. Disc is in a completely unrecorded state or a partially recorded state, and when the optical disc is in the partially recorded state, the PMA data is stored in the memory, and the stored data is read from the optical disc. As in-area data, access the program area of the same optical disc,
The point is that reproduction is possible.

[0009]

Since the above method is adopted, the unrecorded state, the partially recorded state and the recorded state of the optical disc can be discriminated, and in the case of the disc in the partially recorded state, the data (PMA data ) Can access and play the disc.

Therefore, since the data recorded up to that time can be reproduced during the additional recording of the optical disk, and the additional recording operation can be performed up to 99 times in the case of the additional recording disk, the additional recording operation is started after the reproduction. can do. In other words, in the case of a write-once disc, new data can be recorded while checking the recorded data (each file). When the disc is full, the write-once is terminated and the lead-in area By recording the above, the large capacity of the disc can be fully utilized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical disc reproducing method of the present invention discriminates whether the optical disc is in a non-recorded state (including a partially recorded state) or a recorded state by the recording state of the lead-in area of the write-once disc. If is not a recorded state, the PMA of the optical disc is accessed and reproduced, and whether the optical disc is in a completely unrecorded state or a partially recorded state is discriminated by the recorded state of the PMA, and it is in a partially recorded state. In this case, the PMA data is recorded in the memory, and the disc in the same partial recording state can be accessed and reproduced according to the recorded data.

Therefore, the optical disk reproducing apparatus of the present invention uses a spindle motor 2 for rotating an optical disk (recordable disk) 1, an optical pickup 3 for reproducing data on the optical disk 1, and an RF signal from the optical pickup 3. A focus servo 4 and a tracking servo 5 for controlling the drive of the optical pickup 3, a sync detector 6, a digital signal processor 7, and a sub-coding detector 8 for digitally processing the RF signal.
The PLL unit 9 for synchronizing the same digital processing and controlling the rotation of the spindle motor 2, and the R unit
An ATIP signal reproducing unit 10 for detecting an ATIP signal by an F signal, a PLL unit 11 for synchronizing the ATIP signal detecting unit 10, an access control signal of the reproduced signal from the sub-coding detecting unit 8 and an ATIP signal detecting unit 10.
The first switch 1 for switching the access control signal of the ATIP signal from the
2, a second switch 13 for switching between a rotation servo signal based on the reproduction signal from the PLL unit 9 and a rotation servo signal based on the ATIP signal from the PLL unit 11, and rotation control of the spindle motor 2 based on the rotation servo signal. Then, it is judged whether or not data is recorded in the lead-in area of the optical disc 1 by the rotary servo 14 for keeping the linear velocity of the optical disc 1 at a predetermined value and the RF signal, and the unrecorded state of the optical disc 1 is judged. An unrecorded / recorded discriminating circuit 15 which can discriminate a recorded state (including a partially recorded state) and a memory section 16 for recording PMA data of the optical disc 1 when the optical disc 1 is in the partially recorded state. It has and.

Next, a reproducing method applied to the optical disc reproducing apparatus having the above structure will be described with reference to the flowchart of FIG.

First, when the write-once disc 1 is set in the optical disc reproducing apparatus and the write-once disc 1 is played back, the lead-in area of the write-once disc 1 is accessed by the optical pickup 2.

By the RF signal reproduced by this access,
The unrecorded / recorded discriminating circuit 15 determines whether the write-once disc 1 is in a non-recorded state (recordable state) or a recorded state (recordable state).

This is to access and reproduce the beginning of the lead-in area of the write-once disc 1 (step ST
1) In the recorded state, depending on whether or not the reproduced RF signal includes the EFM signal (step ST2), that is, whether or not data (track information or the like) is written in the lead-in area. Identify whether or not there is.

When the track information and the like have already been written, the additional write disc 1 is a recorded disc, so that the data in the program area of the additional write disc 1 is recorded in the same manner as in the conventional case according to the information. It can be reproduced (step ST3).

At this time, the first and second switches 12 and 13 are switched to the terminal a side, respectively.
Access control of the reproduction signal is performed, and rotation servo control by the reproduction signal is performed.

Next, if the reproduction signal (RF signal) in the lead-in area does not include an EFM signal, that is, if the write-once disc 1 is completely unrecorded or partially recorded, the first and Second switch 1
2 and 13 are respectively switched to the terminal b side, and the rotation of the additional recording disk 1 is controlled by the ATIP data recorded on the disk 1.

In this case, the additional recording disk 1 has an ATIP
Since time data and the like are recorded in advance by the signal, this data may be encoded.

With the encoded data, it is possible to access and reproduce the write-once disc 1 even when the write-once disc 1 is in an unrecorded state or a partially recorded state.

Therefore, the PMA of the additional recording disk 1 is
The head of (see FIG. 3) is accessed to reproduce the data of the same PMA (step ST4), and it is determined whether or not the reproduced signal (RF signal) includes the EFM signal (step ST5).

When no data is written in the PMA of the additional write disc 1, the additional write disc 1 is in a completely unrecorded state, and when some data is written in the PMA, the additional write disc 1 is recorded. Is a partial recording state, that is, a recordable state.

Subsequently, when the additional recording disk 1 is in a completely unrecorded state, the reproducing process is ended, and when the additional recording disk 1 is in a partially recorded state, the PMA of the additional recording disk 1 is finished. The data recorded in is read and these data are stored in the memory unit 15.

By using the data stored in the memory section 15 as the lead-in data of the additional write disc 1, each track of the additional write disc 1 can be accessed, and the additional write disc 1 is a recorded disc. Similarly, the program area can be accessed and played.

The additional recording disc 1 can be additionally recorded up to 99 times, and the start and end time information of each track is sequentially recorded in the PMA of the additional recording disc 1 for each additional recording, and the last additional recording is completed. When you do the same disk 1 for additional recording
The PMA data (track information) is recorded in the lead-in area of the write-once disc 1.

As described above, when reproducing the above-mentioned additional recording disc 1, since it is possible to distinguish the unrecorded state, the partially recorded state, and the recorded state, and it is possible to reproduce the partially recorded state of the additionally recorded disc. However, even if there is no data written in the lead-in area, the data recorded up to that point can be reproduced, and the write-once operation can be restarted after this reproduction, so that a large-capacity optical disk can be used without waste. Therefore, the use range of the write-once disc 1 can be further expanded.

[0028]

As described above, according to the optical disc reproducing method of the present invention, it is discriminated whether the disc is in the unrecorded (and partially recorded) state or the recorded state by the reproduction signal in the lead-in area of the disc. In the unrecorded state, the rotation of the optical disc is controlled by the ATIP data of the optical disc, and the PMA of the optical disc is accessed.
Playback is performed, and whether this is a completely unrecorded state or a partially recorded state is identified by this reproduced signal (RF signal), and when it is in the partially recorded state, the data in the PMA area of the same disc is recorded in the memory section. Since each track of the optical disc can be accessed and reproduced by the data of the part, when the optical disc is reproduced, not only the unrecorded state, the partially recorded state or the recorded state of the optical disc is identified, but also the partially recorded state of the optical disc, that is, additional recording is in progress. The data already recorded on the optical disc can be recorded, and after that, the optical disc can be additionally recorded, the large-capacity optical disc can be fully used, and the range of use of the additional recording disc can be further expanded. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an optical disc reproducing apparatus to which an optical disc reproducing method of the present invention is applied, showing an embodiment of the present invention.

FIG. 2 is a schematic flow chart explaining a reproducing method of the optical disk reproducing apparatus shown in FIG.

FIG. 3 is a schematic diagram of a schematic area for explaining the state of the write-once optical disc.

[Explanation of symbols]

 1 optical disk (optical disk for additional recording) 2 spindle motor 3 optical pickup 4 focus servo 5 tracking servo 6 sync detection unit 7 digital signal processing unit 8 subcoding detection unit 9, 11 PLL unit 10 ATIP signal reproduction unit 12 first switch 13th 2 switch 14 rotary servo 15 unrecorded / recorded identification circuit 16 memory section

Claims (1)

[Claims] 1. When reproducing an optical disc, the lead-in area of the optical disc is accessed and reproduced, and whether the optical disc is in an unrecorded state or a recorded state is discriminated by the recording state of the lead-in area. If it is not in the recorded state, the PMA is accessed and reproduced by the ATIP data of the optical disc, and whether the optical disc is in the completely unrecorded state or the partially recorded state is identified by the recording state of the PMA, If the optical disk is in the partial recording state, the PM
The data of A is stored in the memory, and the stored data is used as the lead-in area data of the optical disc.
A method of reproducing an optical disk, characterized in that a program area of the optical disk can be accessed and reproduced.