JP2727837B2 - Optical disc playback method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk capable of discriminating whether the optical disk is in an unrecorded state, a partially recorded state, or a recorded state when reproducing the optical disk, and enabling reproduction of the disk in the partially recorded state. It relates to a reproduction method.

[0002]

2. Description of the Related Art Conventionally, in this type of optical disk reproducing method, data in a lead-in area of an optical disk is reproduced, and the start time of all tracks (musical music, data) recorded on the optical disk is read. ,
The number of tracks, the end time of the last track, that is, the table of contents of the disk is read, and each track is reproduced using the read data.

[0003]

By the way, in the above-mentioned method for reproducing an optical disk, it is impossible to reproduce the optical disk if no data is written in the lead-in area.

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. However, there is a disadvantage that the disk in the partially recorded state cannot be reproduced.

That is, in the case of the above-mentioned write-once disc 1, up to 99 times of write-once can be performed from the standard, and when the last write-once is completed, 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 and partial recording of the additional recording disc 1 (shown in FIG. 3).

When reproducing the additional recording disk 1 in the partial recording state, even though there is still an additional recording space (user area shown in FIG. 3), the same recording
Write data to the lead-in area of
Must be in a recorded state, and a large capacity (for example, 54
(0 Mbytes) optical disk may not be used effectively.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reproduce a partially recorded disk even during additional recording, that is, to increase the use of the additional recording disk. It is another object of the present invention to provide a method for reproducing an optical disk.

[0008]

Means for Solving the Problems To achieve the above object,
Because, an optical disk reproducing method of the present invention, when reproducing the optical disk, access the lead-in area of the optical disc, to play, whether the optical disc by the recording state of the lead-in area is an unrecorded state or recorded state If the disc is identified and the optical disc is not in the recorded state, the PMA (Program) is obtained from the ATIP data of the optical disc.
m Memory Area) is accessed and reproduced, and whether the optical disc is in a completely unrecorded state or a partially recorded state is identified based on the recording state of the PMA. The gist of the present invention is that PMA data is stored in a memory, and the stored data is used as data in a lead-in area of the optical disc, so that a program area of the optical disc can be accessed and reproduced.

[0009]

According to the above method, an unrecorded state, a partially recorded state, and a recorded state of the optical disk can be identified. In a partially recorded disk, the data (PMA data) stored in the memory unit can be identified. ) Allows the same disk to be accessed and played.

Therefore, during the additional recording of the optical disk, the data recorded so far can be reproduced, and in the case of the additional recording disk, the additional recording operation can be performed up to 99 times. 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), and when the capacity of the disc becomes full, the write-once is terminated and the lead-in area is read. By performing the recording, the large capacity of the disc can be fully utilized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk reproducing method according to the present invention discriminates whether an optical disk is in an unrecorded state (including a partially recorded state) or a recorded state based on a recording state of a lead-in area of a write-once disk. If the optical disk is not in the recorded state, the PMA of the optical disk is accessed and reproduced, and whether the optical disk is in a completely unrecorded state or a partially recorded state is identified based on the recorded state of the PMA, and the PMA is in a partially recorded state. In this case, the data of the PMA is recorded in the memory, and the disk in the partially recorded state can be accessed and reproduced according to the recorded data.

Therefore, the optical disk reproducing apparatus of the present invention comprises a spindle motor 2 for rotating an optical disk (recording disk) 1, an optical pickup 3 for reproducing data of 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 driving of the optical pickup 3; a synchronization detector 6, a digital signal processor 7 and a sub-coding detector 8 for digitally processing the RF signal;
A PLL unit 9 for synchronizing the digital processing and controlling the rotation of the spindle motor 2;
An ATIP signal reproducing unit 10 for detecting an ATIP signal based on the F signal; a PLL unit 11 for synchronizing the ATIP signal detecting unit 10; an access control signal of the reproduced signal from the subcoding detecting unit 8 and an ATIP signal detecting unit 10
A first switch 1 for switching between an ATIP signal and an access control signal from the controller and outputting the signal to the tracking servo 5
2, a second switch 13 for switching between a rotation servo signal based on a reproduction signal from the PLL unit 9 and a rotation servo signal based on an ATIP signal from the PLL unit 11, and controlling the rotation of the spindle motor 2 by the rotation servo signal. Then, it is determined whether or not data is recorded in the lead-in area of the optical disc 1 based on the rotary servo 14 for keeping the linear velocity of the optical disc 1 constant at a predetermined value, and the unrecorded state of the optical disc 1 is determined. An unrecorded / recorded discrimination circuit 15 for identifying a recorded state (including a partially recorded state) or a memory section 16 for recording PMA data of the optical disk 1 when the optical disk 1 is in a partially recorded state And

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

First, assuming that the additional recording disk 1 is set in the optical disk reproducing apparatus and the additional recording disk 1 is to be reproduced, the lead-in area of the additional recording disk 1 is accessed by the optical pickup 2.

According to the RF signal reproduced by this access,
The unrecorded / recorded discrimination circuit 15 determines whether the additional recording disk 1 is in an unrecorded state (recordable state) or a recorded state (nonrecordable state).

This means that the head of the lead-in area of the write-once disc 1 is accessed and reproduced (step ST).
1) Depending on whether or not the reproduced RF signal includes an EFM signal (step ST2), that is, whether or not data (track information or the like) is written in the lead-in area, the recorded state is determined. The presence or absence is identified.

If the track information or the like has already been written, the additional recording disk 1 is a recorded disk, and the data in the program area of the additional recording disk 1 is written in the same manner as in the prior art in accordance with the information. It can be reproduced (step ST3).

At this time, the first and second switches 12 and 13 are each switched to the terminal a, and
The access control of the reproduction signal is performed, and the rotation servo is controlled by the reproduction signal.

Subsequently, when the reproduction signal (RF signal) of the lead-in area does not include the EFM signal, that is, when the write-once disc 1 is completely unrecorded or partially recorded, Second switch 1
The terminals 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.

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

With the encoded data, the additional recording disk 1 can be accessed and reproduced even when the additional recording disk 1 is in an unrecorded state or a partially recorded state.

The PMA of the write-once disc 1
(Program Memory Area:Figure3 participants
Access to the beginning of the PMA and play the same PMA data
(Step ST4) The reproduction signal (RF signal) is subjected to EF
Contains M signalOrIs determined (step ST
5).

When no data is written on the PMA of the additional recording disk 1, the additional recording disk 1 is in a completely unrecorded state, and when any data is written on the PMA, the additional recording disk 1 is not written. Is a partial recording state, that is, a state in which additional recording is possible.

Subsequently, when the write-once disc 1 is in a completely unrecorded state, the reproduction process is terminated, and when the write-once disc 1 is in a partially-recorded state, the PMA of the write-once disc 1 is Are read, and these data are stored in the memory unit 15.

By using the data stored in the memory unit 15 as the lead-in data of the additional recording disk 1, each track of the additional recording disk 1 can be accessed, and the additional recording disk 1 can be read from the recorded disk. Similarly, the program area can be accessed and reproduced.

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

As described above, when reproducing the above-mentioned additional recording disk 1, since the unrecorded state, the partially recorded state, and the recorded state can be identified, and the partially recorded state of the disk can be reproduced. In this case, the data recorded up to that point can be reproduced without writing data to the lead-in area, and the additional recording operation can be resumed after the reproduction, so that a large-capacity optical disk can be used without waste. As a result, the usable range of the additional recording disk 1 can be further expanded.

[0028]

As described above, according to the optical disk reproducing method of the present invention, it is determined whether the disk is in an unrecorded (and partially recorded) or recorded state by a reproduced signal in the lead-in area of the disk. In the unrecorded state, the rotation of the optical disk is controlled by the ATIP data of the optical disk, and the PMA of the optical disk is accessed.
The disc is reproduced to determine whether the disc is in a completely unrecorded state or a partially recorded state based on the reproduced signal (RF signal). When the disc is in the partially recorded state, data in the PMA area of the disc is recorded in a memory section. Since each track of the optical disk can be accessed and reproduced by the data of the part, when reproducing the optical disk, not only discrimination of the unrecorded, partial recorded or recorded state of the optical disk but also the optical disk in the partially recorded state, that is, during the additional recording Data that has already been recorded on the same optical disk, and after that the additional recording of the same optical disk can be performed, making it possible to make full use of the large-capacity optical disk and further expanding the use range of the additional recording disk. There is an effect that can be.

[Brief description of the drawings]

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

FIG. 2 is a schematic flowchart illustrating a reproducing method of the optical disk reproducing device shown in FIG.

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

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 27/10 A

Claims (1)

(57) [Claims] At the time of reproduction of an optical disk, a lead-in area of the optical disk is accessed and reproduced, and whether the optical disk is in an unrecorded state or a recorded state is identified based on a recording state of the lead-in area. If it is not in the recorded state, the PMA (Program Memory Area) is used according to the ATIP data of the optical disc.
a) is accessed and reproduced, and according to the recording state of the PMA,
Discriminates whether the optical disc is in a completely unrecorded state or a partially recorded state, and when the optical disc is in a partially recorded state, the PM
A data is stored in a memory, and the stored data is used as data in a lead-in area of the optical disc,
A method for reproducing an optical disk, wherein a program area of the optical disk can be accessed and reproduced.