JP2789530B2 - Optical disk device - Google Patents

Description

The present invention relates to an optical disk recording device.

[Conventional technology]

When recording on an optical disc such as a write-once CD that is compatible with a read-only CD, the TOC (TABLE OF
An empty area is recorded to record (CONTENT), and the music signal is recorded from the outside to the outer periphery. Then, when the recording reaches the predetermined outer peripheral position, or when it is determined that no more music signals are recorded on the optical disk, the optical pickup is moved to the TOC area on the inner peripheral surface of the optical disk, and the recording is performed. The table of contents information of the tune is recorded in this TOC area, and is completed as a write-once CD recording completed disc.

As described above, in the recording / reproducing apparatus such as the write-once CD, it is necessary to complete the recording at a stretch and record the TOC on the disk while the power is turned on. Therefore, the power of the apparatus cannot be turned off until the recording including the TOC is completed.

If you can't record at once, and you need to interrupt the recording and restart it later,
It has been practiced to temporarily record a TOC of a music signal or the like recorded on a CD on a floppy disk or the like defined corresponding to each write-once CD. In this way, even if the power of the recording apparatus is cut off when the recording is interrupted, the TOC can be read from the floppy disk when the next recording is to be performed.

[Problems to be solved by the invention]

However, in this case, it is necessary to manage the floppy disk corresponding to each write-once disk,
There is a drawback that the device becomes complicated and large.

[Means for solving the problem]

The present invention relates to an optical disc device for recording a plurality of recording signal blocks in a program area by EFM modulation and recording the table of contents information of the recording signal in a TOC area on an inner periphery of the program area. Means for recording the provisional table of contents of the recording signal blocks recorded in the program area in a temporary recording area provided on the inner peripheral side outside the area by modulation different from EFM modulation, and a plurality of recording signal blocks After being recorded in the area by EFM modulation and recorded in the temporary recording area by a modulation different from EFM modulation, the table of contents information recorded in the temporary recording area is reproduced, and E is recorded in the TOC area.
This is an optical disk device having means for recording by FM modulation.

[Action]

According to the present invention, the table of contents information of information recorded in a predetermined recording area by EFM modulation is recorded as temporary table of contents information in a temporary recording area further inside the TOC area by modulation different from EFM modulation, and is recorded. The TOC information is always recorded on the optical disk, and multiple recording signal blocks are recorded on the optical disk.The table of contents information recorded in the predetermined recording area reproduces the provisional table of contents information already recorded in the temporary recording area. Then, since the table of contents is recorded by EFM modulation in the TOC area adjacent to the temporary recording area, the possibility of missing the table of contents is reduced, and the signal is reliably recorded in a predetermined area to obtain and reproduce the table of contents. Can be. Also, the provisional table of contents information recorded outside the predetermined recording area is
EFM was recorded with a different modulation from EFM modulation.
According to the reproducing apparatus using modulation, reproduction can be performed without error, and recording of an optical disk having compatibility can be performed.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of an optical recording / reproducing apparatus according to the present invention. In the figure, an optical disc 3 is CLV-controlled by a spindle motor 1 and given a required rotation speed. The information recorded on the optical disk 3 is read by the optical pickup 2, and is passed through a head amplifier 6 and a signal detection circuit 7 to an EFM demodulation circuit 8 and a PE (PHSE ENCODIN).
G) Applied to demodulation circuit 10. The output of the EFM demodulation circuit 8 is
The music signal is added to the system control unit 20 via the subcode extraction circuit 9, and the music signal is demodulated via the demodulation circuit 11 and is output to the output terminal 12. The output of the PE demodulation circuit 10 is applied to a system control unit 20.

The provisional table of contents information signal from the system control unit 20 is applied to the laser modulation circuit 14 via the PE modulation circuit 15. The sub code signal from the system control unit 20 is applied to the EFM modulation circuit 16, and the recording signal 17 from the recording information input terminal is
It is applied via an A / D converter 19 and a modulation signal processing circuit 18. The output of the EFM modulation circuit 16 is applied to the laser modulation circuit 14, and the output of the laser modulation circuit 14 is applied to the optical pickup 2.

The slide control signal from the system control unit 20 is applied to the slide device 4 via the slide drive circuit 13. The optical pickup position detection output from the slide device 4 and the optical disk mounting detection output from the optical disk sensor 5 are:
Each is added to the system control unit 20.

FIG. 2 is a cross-sectional view showing an example of the optical disk 3 used in the present invention. The optical disk 3 has a center hole 31 at the center and a TOC area 32 and a program area 33 in order from the inner circumference.
In the program area 33, songs A,
The music signals 34, 35,... Of the song B are recorded and the TOC area 3
The music signals 34, 35,...
Are recorded as provisional table of contents information 36, 37,...

 The operation according to the above configuration will be described in detail below.

In the figure, when the power is turned on, the system controller 20
Checks the presence / absence of mounting of the optical disk 3 based on the output of the optical disk sensor 5. When the optical disk 3 is loaded,
The optical pickup 2 is moved toward the inner circumference of the optical disc 3 while controlling the position of the optical pickup 3 based on a detection signal from a position sensor attached to the slide device 4.

Here, in order to check the TOC of the optical disk 3, the signal from the optical pickup 2 is processed by the head amplifier 6, the signal detection circuit 7, and the EFM demodulation circuit 8, and the subcode signal is extracted by the subcode extraction circuit 9. . Here, in the optical disc 3 based on the CD standard, the TOC area (lead-in)
Contains the table of contents information for the song. Therefore, if the optical disk 3 has been recorded, this TOC information enters the system control unit 20 from the subcode extraction circuit 9 as a subcode signal, so that the mounted optical disk 3 It can be recognized as a CD or a read-only CD. At this time, the recording is not performed on the loaded optical disc 3, and the system controller 20 does not respond even if a recording command is issued to the recording command terminal 21 from the host device or the operation key. That is, an operation of only reproduction is performed.

Next, when the TOC cannot be detected, the loaded optical disk 3 is recognized as a write-once CD. In this case, the program area 33 of the optical disc 3 is prepared in response to the recording command.
Start position, i.e., TOC area 32 and program area 33
The optical pickup 2 is moved to the boundary position of. Here, when a recording command signal is added to the recording command terminal 21, the input recording signal 17 such as music is applied to a modulation signal processing circuit 18 via an A / D converter 19, and an error correction code word is The signal processing to be added is performed, and is applied to the EFM modulation circuit 16. At this time, a subcode such as a time code is also added to the EFM modulation circuit 16 from the system control unit 20 at the same time. E
The output of the FM modulation circuit 16 is applied to the laser modulation circuit 14, and recording is performed on the optical disk 3 by the optical pickup 2.

Assuming that the recording signal is music piece A, the music signal 34 of music piece A is recorded on the optical disk as shown in FIG. Here, when a recording stop command 23 is input to the system control unit 20, the recording of the music signal on the optical disc 3 is stopped. At the same time, the optical pickup 3 is moved to the inner circumference of the disc in order to record the temporary table of contents information a of the recorded music piece A. Here, song A
Is added to the laser modulation circuit 14 through the PE modulation circuit 15 in a band different from that of the EFM modulation circuit, and is recorded from the optical pickup 2 to the area 36 of the optical disk 3. When this recording is completed, the optical pickup 2 is returned to the recording stop position of the music signal on the optical disk 3 just before. Then, it waits for a recording command for the next song. Here, even if the power of the apparatus is turned off, since the provisional music table of contents information a has already been recorded on the optical disc 3, the PE modulated signal is PE-demodulated and recorded from the optical disc 3 by the above-described procedure. The position can be recognized. When a recording instruction is given again at the recording stop position of the music A, the music signal of the music B and the temporary music table of contents B of the music B are stored in the area 37 in the area 36 in which the temporary table of information a is recorded. Record continuously next to. As described above, the music signal is recorded from the inside as song A, song B,..., And from the innermost circumference of the TOC area 32 to the inner circumference, the table of contents information a, b of each music A, B,. ,…
Is recorded.

Although the program area gradually disappears as the recording is performed in this way, the management of this is performed by the system control unit 20, and when all the recording has been performed on the program area of the disc, or when no more recording is performed, According to the judgment, when an end command is applied to the command terminal 22 from the host device, the provisional music table of contents information a, b,... Is converted into the TOC area 32 of FIG. Record.

The operation during recording in the TOC area will be described with reference to the operation flowchart of FIG. Step 1
Then, a command from the host device or the operation key is received. The received command is analyzed from step 2 to step 6, and each operation is performed. However, at the same time that the operations of steps 7, 8, 9, and 10 are performed, the process returns to step 1 and receives the command from the upper device or the operation keys as described above. That is, playback operation, recording operation, recording pause, and temporary TOC
While performing each operation of recording operation and search operation, at the same time,
A command is being input from the host device. However, if it is determined in step 6 that the command is a recording end command,
Perform TOC write operation. In step 12, looping is performed until the operation is completed. In the previous reproduction operation and the like, while returning to step 1 while performing the operation, the instruction is received. Here, looping is performed without returning to step 1. This is to prevent the recording from being stopped halfway due to the operation of the device upon receiving another command while writing a very important TOC on the CD. If the TOC recording is interrupted on the way, the TOC data may be interrupted. Becomes Therefore, during the TOC recording, the TOC data can be surely recorded by not responding to other commands.

Now, when the write-once CD on which the temporary music table of contents information a and b as described above is recorded is used as the optical disc 3, the system control unit 20
First, while recognizing the position of the optical pickup 2 by the position sensor of the slide device 4, the slide drive circuit 13 moves the optical pickup 2 further to the inner periphery of the TOC area 32 to perform the reproducing operation. The obtained reproduction signal is applied to the PE demodulation circuit 10 via the signal detection circuit 7, and the presence or absence of the provisional music table of contents information a, b,. When a music piece has already been recorded halfway on the optical disc 3, the index information a and b of the temporary music piece is fetched from the areas 36 and 37 as described above. Therefore, from these pieces of information, it is possible to know from which part of the optical disk 3 recording is possible, and the tune can be reproduced by the provisional table of contents information 36, 37 of the already recorded tune.

On the other hand, if the table of contents information of the music is not taken in at all, the mounted optical disk 3 is regarded as an unrecorded disk on which all recording is not performed, and the recording command is awaited.

〔The invention's effect〕

As described above, according to the present invention, even for an optical disk in the middle of recording, the table of contents information of the information recorded on the optical disk can be reproduced, and even if the power is cut off during the recording. The table of contents information of the signal block recorded in the predetermined recording area can be read from the temporary recording area, so that the operability is good, and the table of contents information is reproduced from the adjacent temporary recording area to the TOC area with modulation different from EFM. Regular T
Since the recording is performed by EFM modulation in the OC area, the possibility of data loss accident during transfer recording can be reduced,
The recorded optical disk can be reproduced by EFM modulation.

[Brief description of the drawings]

FIG. 1 is a block diagram of an optical disk recording apparatus of the present invention,
FIG. 2 is a conceptual diagram showing an example of a recording state of an optical disk on which recording has been performed according to the present invention, and FIG. 3 is an operation flowchart of the optical disk device of the present invention.

Claims (1)

(57) [Claims] 1. An optical disc device for recording a plurality of recording signal blocks in a program area by EFM modulation and recording the table of contents information of the recording signal in a TOC area on an inner periphery of the program area. Means for recording the provisional table of contents of the recording signal blocks recorded in the program area in a temporary recording area provided on the inner peripheral side outside the recording area by a modulation different from EFM modulation, and a plurality of recording signal blocks as described above. After being recorded in the program area by the EFM modulation and recorded in the temporary recording area by a modulation different from the EFM modulation, the table of contents information recorded in the temporary recording area is reproduced, and the E is recorded in the TOC area.
An optical disc device comprising means for recording by FM modulation.