JP3466566B2 - Information reproducing method and information reproducing apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing method and an information reproducing apparatus for recording record data on an optical disc.

[0002]

2. Description of the Related Art Write-once type optical disks have been developed which can record data only once. In this write-once optical disc, the organic dye applied to the pre-groove in which the wobbling signal and the position information for keeping the linear velocity at the time of recording just before the reflection layer are formed is irradiated with laser light. Information is recorded by making an optical change.

A conventional apparatus for recording data on such a write-once type optical disc has been designed to perform recording according to the format shown in FIG. That is, FIG.
(A) shows a recording format of a write-once optical disc (CD-R), where PCA is an area for checking write power, RI is a lead-in area, DATA is a write data area, and RO is a lead-out area. .

Writing data to a conventional CD-R is shown in FIG.
As shown in (A), the RI data and RO data are added before and after the additional write data for each additional write data, and the CD-R is added.
I am trying to write to. Further, as shown in FIG. 5B, the format of each data to be written in the CD-R is such that a sync signal (SYNC) and a sync signal number (S #) are added for each fixed length of write data. I try to put it in.

[0005]

As described above, in the conventional writing of data to a CD-R, a large amount of lead-in data and lead-out data is added to each additional write data.

Therefore, the lead-in and lead-out areas increase in accordance with the number of times of additional recording on the CD-R, and the recording area for recording necessary data decreases accordingly. Also, when reproducing the data recorded in this way, it is not possible to determine the last lead-out because it is not known how much writing is done, and the last lead-out area is passed. The reading is performed, and the determination is made by knowing that the writing is not performed (not formatted) there.

Therefore, if the formatting is not performed, the synchronization signal used for the spindle servo control cannot be obtained, the synchronization is lost, and the information must be reproduced again by the complicated processing. According to the present invention, the data recording area does not decrease much even if the number of additional recordings increases,
Another object of the present invention is to provide an information reproducing method and an information reproducing apparatus for reproducing an optical disc recorded in a recording format including a write data area and a partition area so that the recording end position can be easily determined.

[0008]

Before describing the means for solving the above-mentioned problems, the recording format of the optical disk according to the present invention will be described with reference to FIG. Figure 4
4A shows the recording format of the CD-R used in the present invention, and FIG. 4B shows the write data format. Figure 4
The write data format shown in FIG. 5B uses the same format as that described with reference to FIG.

In FIG. 4A, the write power check area (PCA), the lead-in area (RI), the data (DATA) and the lead-out area (RO) are the same as those described with reference to FIG. 5A. is there. According to the present invention, a management information area (MA) for recording a directory of data to be recorded before writing data, a partition address indicating a recording end position, and the like, and a partition area (PA) indicating a recording end position next to the recording data are provided. Set up. Since the amount of data in MA and PA is much smaller than that in RI and RO, the reduction of the data area due to the addition of MA and PA is very small.

As the data to be written in the PA, a predetermined binary data (P) is written. As shown in FIG. 5 (A),
When performing the second additional recording (Chapter 2 ) on the CD-R on which the first writing (Chapter 1) has been performed, first the MA is read to know the PA position, and the partition data (P) is recorded at the PA position. If (P) is recorded, it is necessary to rewrite data (E) other than (P) and then write MA, DATA and PA shown in Chapter 2. To Therefore, when a plurality of additional recordings are performed, only the last added PA of the chapter is recorded with the partition data (P) indicating the ending position, and the previous PA of the chapter is rewritten with (E). The writing end position can be easily known by changing to data other than (P). In addition, when the additional recording to the CD-R is finished, as shown in FIG.
Write O.

Next, means for solving the problem will be described. The present invention according to claim 1, the write data area to record therein the record data, is placed behind of the write data area, for recording the partition data indicating whether or not the recording end position An information reproducing method for reproducing an optical disc in which a plurality of chapters each having a partition area are recorded, wherein the recording data is reproduced first.
Standing, read the partition data from the partition area of one chapter, determine whether the read partition data indicates the recording end position, if the read partition data does not indicate the recording end position, until the read partitions data indicating the recording end position, have rows operation determines whether reading the partition data from the partition area of the next chapter, the partition data issued said read indicates the recording end position, then, Record day
It is characterized by starting reproduction of data.

According to a second aspect of the present invention, in the information reproducing method according to the first aspect, when the partition data is in a non-written state, it indicates a recording end position.

The present invention according to claim 3 provides the invention according to claim 1 or 2.
In the information reproducing method described, the chapter is further
A management information area is provided in front of the write data area for recording an address of the partition area.

According to a fourth aspect of the present invention, in the information reproducing method according to the third aspect, when the partition data does not indicate a recording end position, the partition is deleted from the management area arranged after the partition area. It reads the address of the area, based on the address, and wherein the Pate I shea Yon'eria the next chapter be read the partition data.

According to a fifth aspect of the present invention, a write data area for recording the record data and partition data arranged after the write data area and indicating whether or not the recording end position is recorded. Is an information reproducing apparatus for reproducing an optical disc in which a plurality of chapters each having a partition area for recording are reproduced, and a reading means for reading the partition data from the partition area of one chapter, and a read end position of the read partition data If the read partition data does not indicate the recording end position, the reading means continues to read the next chapter until the read partition data indicates the recording end position. Read the partition data from the partition area of An information reproducing apparatus characterized in that the recording determination means repeats an operation of determining whether or not the read partition data indicates a recording end position, and then reads the recording data corresponding to the input command. .

According to a sixth aspect of the present invention, in the information reproducing apparatus according to the fifth aspect, when the partition data is in a non-written state, it indicates a recording end position.

The present invention according to claim 7 is the claim 5 or 6
In the information reproducing apparatus described, the chapter is further
A management information area is provided in front of the write data area for recording an address of the partition area.

The present invention according to claim 8 is the information reproducing apparatus according to claim 7, wherein when the partition data does not indicate a recording end position, the reading means is arranged behind the partition area. It reads the address of the partition area from the management area, based on the address, and wherein the reading the partition data from the next chapter <br/> Pate I shea Yon'eria. The present invention according to claim 9 is a contract
The information reproducing method according to any one of claim 3 or 4
The recording format of the optical disc depends on the writing power.
Write power check area for checking
It has a built-in area and the management information area
The data amount of is more than the data amount of the lead-in area
Characterized by the small number. The present invention according to claim 10 is
Information reproduction method according to any one of claims 1 to 4 and 9.
In the law, when adding the recorded data at the end,
Indicates that the lead-out area is on the outermost peripheral side of the optical disc.
The amount of data in the partition area is
Note that the amount of data is less than that in the lead-out area.
To collect. The present invention according to claim 11 provides the invention according to claim 7 or 8.
In the information reproducing device described in any one of
Check the writing power for the disk recording format.
Write power check area and read-in area
And the amount of data in the management information area
Is less than the amount of data in the lead-in area
Is characterized by. The present invention according to claim 12 provides the invention according to claim 5.
The information reproducing apparatus according to any one of items 8 to 11
When adding the recorded data at the end, read
An out area is formed on the outermost peripheral side of the optical disc,
The amount of data in the partition area is
It is characterized in that it is smaller than the amount of data in the out area.

[0019]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of an embodiment of the present invention. In FIG. 1, 1 is a write-once optical disc (CD-R), 2 is a motor, 3 is a pickup, 4 is a servo circuit, 5 is a laser, 6 is an encoder, 7 is a power control circuit for the laser 5,
Reference numeral 8 is a regenerative amplifier, 9 is a decoder, 10 is a guide signal decoder, 11 is a management information reading unit, 12 is a management information writing unit, 13 is a partition data reading unit, 14 is a determination unit, and 15 is partition data (re).
A writing unit, 16 is a control unit, 17 is an input unit, 18 to 23 are interfaces (I / O), and 24 is a processor (CPU) that performs processing.

Next, the recording operation of the present invention will be described with reference to FIG. In process S1, the servo circuit 4 performs a servo process for controlling the rotation of the motor 2 and the tracking and focus of the pickup 3. In process S2, the control unit 16 instructs the power control circuit 7 to execute the operation shown in FIG.
The output of the laser 5 is increased in the PCA area of the CD-R shown in (A), and the optimum power value for writing is checked.

In the process S3, if the CD-R 1 is an unwritten optical disc, the process proceeds to the process S4, and if it is already written, the process proceeds to the process S9. In step S4, the management information writing unit 12 creates management information and
It is output via O18, encoded by the encoder 6 to modulate the output of the laser 5, and the CD-R from the pickup 3.
1 is irradiated and management information is written.

In step S5, the control section 7 outputs the recording data input from the I / O 22 via the I / O 18,
Write data to CD-R1. When the writing of the data is completed, in step S6, the partition data (re) writing unit 15 writes the partition data (P).

In step S7, the CD-R1 is input from the input unit 17.
If the input for terminating the writing has not been input, the processing is ended, and if the input has been input, the processing proceeds to step S8 and the processing shown in FIG.
As shown in (A), the lead-out data and the MO are written, and the process ends. Further, if the determination in process S3 is NO, the process proceeds to process S9, and in process S9, the management information reading unit 11 reads the management information from the CD-R 1 via the I / O 20.

In process S10, the partition data reading unit 13 reads the partition data from the address corresponding to the address where the partition data is recorded in the management information read in process S9. In process S11, the determination unit 14 determines whether the data read in process S10 is regular partition data (P). If the determination is YES, the process proceeds to process S12, and if the determination is NO. The process proceeds to step S9, the management information is read, and steps S9 to S11 are repeated.

In step S12, if there is no write area on the CD-R 1, the process proceeds to step S8, and if there is a write area, the process proceeds to step S13. In the process S13, the partition data (re) writing unit 15 rewrites the data (E) different from the regular partition data (P) into the address of the partition data read in the process S10.
Go to 4.

That is, PA of Chapter 1 of FIG. 4 (A)
If (P) is detected at, then (E) is rewritten to the PA of Chapter 1 so that the recording is not (P), and only the PA of the last recorded Chapter (P) is recorded. It In the embodiment, the management information is written in the processing S4 by writing only the management information for the data to be written. However, the management recording for the data recorded before being read in the processing S9 is performed. Information may also be added and writing may be performed.

Further, in the embodiment, when the partition data (P) is detected, (E) is written to write the additional write data so that (P) is written only in the PA of the last Chapter. However, the data is not written in the PA for the additional write data, and when there is an unwritten PA in the additional write, it is determined that this position is the previous write end position, and (P) is written, Then, additional write data may be written.

That is, in the additionally written chapter PA, the SYNC and S # shown in FIG. 4B are written, but the write data is not written. Even with this, S
Since the YNC is written, there is no problem of loss of synchronization. Next, the operation during reproduction will be described with reference to FIG.

When a reproduction command is input from the input unit 17 in the process S21, the process proceeds to a process S22 and the focus, spindle and tracking servo system processes are performed. In step S23, the management information reading unit 11
Reads the management information from the MA of the first Chapter.

In process S24, the partition data reading unit 13 reads data from the address of the partition data in the management information read in process S23. In process S25, the determination unit 14 determines whether or not the data read in process S24 is regular partition data (P). If the determination is NO, the process moves to process S23 to read the management information of the next Chapter. Processing S
23 to S25 are repeated.

If the determination in step S25 is YES, the process moves to step S26, the read management information is referred to, the head is skipped to the position corresponding to the command input in step S21, and the process proceeds to step S27. Read the recorded data. When the reading of the data is completed and the next command is input, the process proceeds to step S26, and when not input, the process ends.

[0032]

As described above, according to the present invention,
An optical disc recorded in a recording format composed of a write data area and a partition area can be reproduced. Further, according to the present invention, after the recording end position is determined, the recording data corresponding to the input command is read out, so that the pickup does not come out to the unformatted portion, and the synchronization loss occurs. It never happens.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of an operation at the time of recording in the embodiment.

FIG. 3 is an operation flowchart during reproduction according to the embodiment.

FIG. 4 is a diagram showing a recording format on a write-once optical disc of the present invention.

FIG. 5 is a diagram showing a recording format on a conventional write-once optical disc.

[Explanation of symbols]

1 Write-once optical disc (CD-R) 2 motor 3 pickups 4 Servo circuit 5 laser 6 encoder 7 Power control circuit 8 Regenerative amplifier 9 decoder 10 Guide signal decoder 11 Management information reading section 12 Management information writing section 13 Partition data reading section 14 Judgment section 15 Partition data (re) writing section 16 Control unit 17 Input section 18-23 interface (I / O) 24 processors (CPU)

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Claims (12)

(57) [Claims] 1. A write data area to record therein the record data, is placed behind of the write data area, and a partition area for recording partition data indicating whether or not the recording end position An information reproducing method for reproducing an optical disc having a plurality of recorded chapters, wherein the partition data is read from a partition area of one chapter before the reproduction of the recorded data, and the read partition data indicates a recording end position. If the read partition data does not indicate the recording end position, the partition data is read from the partition area of the next chapter until the read partition data indicates the recording end position. Recorded partition data is recorded Ryo position have line operation of determining whether shows, then, the information reproducing method characterized by initiating playback of the recorded data. 2. The information reproducing method according to claim 1, wherein when the partition data is in an unwritten state, it indicates a recording end position. 3. The information reproduction according to claim 1, wherein the chapter further comprises a management information area arranged before the write data area and for recording an address of the partition area. Method. Wherein when said partition data does not indicate a recording end position, reads the address of the partition area from said management area disposed behind the partition area, based on the address, the next chapter Pate I information reproducing method according to claim 3, wherein the reading the partition data from shea Yon'eria. 5. A write data area for recording the record data and a partition area arranged after the write data area for recording partition data indicating whether or not the recording end position exists. An information reproducing apparatus for reproducing an optical disc in which a plurality of chapters are recorded, input means for inputting a reproduction command, reading means for reading the partition data from a partition area of one chapter, and the read partition data Determining means for determining whether or not indicates the recording end position, the reading means until the read partition data indicates the recording end position when the read partition data does not indicate the recording end position. Is the partition from the next chapter partition area Reading the data, and the determining means repeats the operation of determining whether or not the read partition data indicates the recording end position, and thereafter reads the recording data corresponding to the input command. An information reproducing device characterized by. 6. The information reproducing apparatus according to claim 5, wherein when the partition data is in a non-written state, it indicates a recording end position. 7. The information reproducing apparatus according to claim 5, wherein the chapter further comprises a management information area arranged before the write data area and for recording an address of the partition area. apparatus. 8. If the partition data does not indicate the recording end position, the reading means reads the address of the partition area from the management area arranged after the partition area, Pate I of chapter
The information reproducing apparatus according to claim 7, characterized in that reading the partition data from shea Yon'eria. 9. The recording format of the optical disc is
Check the write power to check the write power.
Equipped with a rear and lead-in area, The amount of data in the management information area is
Characterized by being less than the amount of data in the doin area
The information reproducing method according to claim 3. 10. When adding the recorded data at the end
Is the lead-out area on the outermost circumference side of the optical disc.
Formed in The amount of data in the partition area is
Contracts characterized by less than the amount of data in the out area
Information reproduction method according to any one of claims 1 to 4 and 9
Law. 11. Recording format of the optical disc
Is a write power check to check the write power.
Equipped with querier and lead-in area, The amount of data in the management information area is
Characterized by being less than the amount of data in the doin area
The information reproducing apparatus according to claim 7. 12. The method according to claim 12, When adding the recorded data at the end
Is the lead-out area on the outermost circumference side of the optical disc.
Formed in The amount of data in the partition area is
Contracts characterized by less than the amount of data in the out area
The information reproducing apparatus according to any one of claims 5 to 8 and 11.
Place