JP2000215607A - Write-once optical disk recording/reproducing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To speedily continuously reproduce user data written on a write-once optical disk by storing link information to a sector where the information becomes invalid as the user data before a link area when the user data is written on the optical disk. SOLUTION: When data is completely written on an optical disk medium 1, a controller 10 records link information based on a size of a sector for storing dummy data and a size of a link area to a first sector where dummy data which is invalid as user data and which is to be added before and after valid user data at the write time is to be stored. The controller reads the link information at the next write time, and starts writing the valid user data from a sector position based on the information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus for additionally writing information on a write-once optical disk and reading the added area to reproduce the information.

[0002]

2. Description of the Related Art A write-once optical disk is a medium that can be written only once. Such a write-once optical disk allows additional recording as many times as there is an unrecorded portion in the information recording area.

[0003] At the time of the additional recording, it is necessary to connect the last part of the previously recorded area and the first part of the currently recorded area so as not to be affected during reproduction, and this processing is called linking. The connection region of the portion connected by the processing is called a linking region.

Conventionally, a write-once optical disk recording / reproducing apparatus (see, for example, Japanese Patent Application Laid-Open No. 9-270171) for performing the above-described linking on a write-once optical disk and additionally writing data, and reproducing the added data has been known. there were.

FIG. 6 is a format diagram of a recording area for explaining additional recording on a write-once optical disc. Here, the format of a track at the time of additional recording between the first recording (recording 1) operation and the second recording (recording 2) is shown.

A conventional write-once optical disc recording / reproducing apparatus is
In the first recording 1, when valid data valid as user data is interrupted, dummy data which is invalid data as user data is recorded from the sector which is the next minimum recording information unit for the next linking. I do.

In the second recording 2, dummy data invalid as user data is recorded in several sectors from the first sector before the end of the first recording 1, and a number of sectors consisting of a linking area and dummy data is recorded. Create an area for a sector.

[0008]

However, in the write-once optical disc recording / reproducing apparatus as described above, when reading the area additionally written on the write-once optical disc continuously,
Since invalid data is read together with valid data when reproducing user data, it is necessary to take out dummy data as invalid data after extracting it as user data. Therefore, there is a problem in that the processing at the time of reproduction becomes complicated and continuous reproduction of user data cannot be performed quickly.

Without the process of removing the dummy data, it is impossible to divide and record additional data in continuous data, and the above problem becomes more remarkable as the number of additional recording portions increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and by storing linking information in a sector which becomes invalid as user data before a linking area at the time of additional recording on a write-once optical disk, the write-once optical disk It is an object of the present invention to be able to quickly perform continuous reproduction of additionally written user data.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a write-once optical disc recording / reproducing apparatus for additionally writing and reproducing data on a write-once optical disc. In the first sector for recording invalid dummy data as user data added before and after the data, linking information based on the size of the sector for storing the dummy data and the size of the linking area is recorded. An additional writing control means is provided for reading linking information and starting additional writing of valid user data from a sector position based on the information.

Further, in the write-once optical disc recording / reproducing apparatus as described above, it is preferable to provide a means for recording, as the linking information, a sector for storing an address of a sector for storing valid user data for the next additional write.

Further, in the write-once optical disc recording / reproducing apparatus as described above, it is preferable that a means for recording a sector having information indicating that the linking information is stored be provided in the sector for storing the dummy data.

Further, in the write-once optical disc recording / reproducing apparatus as described above, when reproducing at the write-once position of the write-once optical disc, the linking information is reproduced, and valid user data is read from a sector position based on the linking information. It is preferable to provide a reproduction control means for restarting the reproduction of the data.

The write-once optical disc recording / reproducing apparatus according to the present invention stores linking information in a sector which is invalid as user data before a linking area for a write-once optical disc, thereby enabling an optical disc having many write-on portions to be written. Can also continuously reproduce the data before and after the added data.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a write-once optical disc recording / reproducing apparatus according to an embodiment of the present invention.

This write-once optical disk recording / reproducing device is a device for additionally writing and reproducing data on a write-once optical disk, and has a microcomputer including a CPU, a ROM, a RAM, and the like, and is realized by the microcomputer. It is composed of various circuits.

This write-once optical disk recording / reproducing apparatus has a C
A write-once optical disc medium 1 such as a DR or DVD-R is rotated by a spindle motor 2, and the rotation is controlled by a servo circuit 3 based on information from an optical pickup 7.

At the time of additional recording on the optical disk medium 1, user data from the host computer is divided into sectors of a recording unit by the encoder circuit 5 via the external host interface 4, and after adding an error correction code, the data is modulated and encoded into pit information. The laser beam is sent to the LD driver 6 to apply a laser drive current to the optical pickup 7, and the data is recorded on the optical disk medium 1 by the laser light emitted thereby.

On the other hand, at the time of reproduction from the optical disk medium 1, a laser drive current of a reproduction level is applied to the optical pickup 7 by the LD driver 6, and reflected light from the optical disk medium 1 is again received by the optical pickup 7 by the laser light by the reproduction power. Then, a signal is obtained by the reproduction signal detection circuit 8, sent to the decoder circuit 9, decoded and converted into data, and after error correction, valid user data is passed to the host computer via the external host interface 4. .

The servo circuit 3 controls the movement of the optical pickup 7 while synchronizing with the data input / output timing during recording and reproduction. The controller 10 connects the servo circuit 3, the LD driver 6, the decoder circuit 9, and the encoder circuit 5, determines and controls the operation of each circuit and the driver, and controls the overall operation of the apparatus.

That is, when the data recording is completed, the controller 10 sets the size of the sector for storing the dummy data in the first sector in which dummy data that is invalid as user data to be added before and after valid user data at the time of additional recording is recorded. And linking information based on the size of the linking area, and read the linking information at the time of the next appending,
It functions as a write-once control means for starting the write-on of valid user data from the sector position based on the information.

Also, it functions as a means for recording a sector for storing an address of a sector for storing valid user data at the time of additional writing as the above-mentioned linking information.

Further, it also functions as means for recording a sector having information indicating that linking information is stored in the sector storing the dummy data.

Further, at the time of reproduction at the recordable position of the recordable optical disk, the reproduction control means also reproduces linking information and resumes reproduction of valid user data from a sector position based on the linking information.

FIG. 2 is a diagram showing a format of a sector configuration of data recorded on the optical disk medium 1. As shown in FIG.
In the figure, the sector which is the minimum recording unit includes, at the beginning, an ID area 11 for storing a sector address, an IEC area 12 which is an error correction code of the ID, a user data area 14 for storing user data, and an error in the user data area 14. Correction code addition (EDC) area 15 and user data area 14
The linking flag area 13 indicates whether linking information is stored in the linking flag.

Next, the write-once processing of this write-once optical disc recording / reproducing apparatus will be described. FIG. 3 is a diagram showing a case where a sector is created for performing additional recording according to claim 1 of the present invention, and modulation and
9 is a flowchart showing a control procedure of a recording operation in an encoder circuit 5 for encoding.

In this control operation, first, in step (indicated by "S" in the figure) 1, recording data is obtained from the external host interface. Proceed to step 2 to check whether there is any unprocessed recording data. If there is, proceed to step 8 to perform error correction processing or the like on the data to create a sector, and proceed to step 9 The sector is modulated and encoded, and input to the LD driver 6. After that, the process returns to step 2 until step 2 is completed.
To 9 are repeatedly performed.

When there is no more data to be recorded in step 2, the processing after step 3 is executed as recording completion processing. First, the process proceeds to step 3, where the size of the dummy data and the size of the linking area are calculated, and the sum thereof is obtained. That is, the sum of the size of the sector for storing dummy data, which becomes invalid user data at the time of additional writing, and the size of the linking area is obtained from the current sector address, and the sum is calculated as the size of the sector that becomes valid as user data at the time of the next additional writing. And linking information indicating the linking information.

Since the size of the linking area and the size of the sector invalidated as user data vary depending on the linking policy, the value of the linking information is determined according to the policy.

Thereafter, the process proceeds to step 4, where the linking information is stored in the first sector, that is, in the first area of the user data area 14 shown in FIG. 2, and the rest is created with dummy data. Further, the process proceeds to step 5 where an error correction code is added to the sector, modulated, encoded, and input to the LD driver 6.

Then, proceeding to step 6, it is determined whether or not the number of dummy data sectors to be recorded at the end of recording (completion) has been output to the LD driver 6 by the planned number calculated in step 3, and if not, the process proceeds to step 10. Proceed to create a sector using the dummy data as user data, and step 5
Then, the process of inputting to the LD driver 6 is repeated.

If the predetermined number of dummy data sectors have been output in the judgment of step 6, the process proceeds to step 7 to notify the controller 10 which performs the overall control of completion, and ends this processing.

Next, a control procedure of the controller 10, the decoder circuit 9 and the encoder circuit 5 at the start of the additional recording in this write-once optical disc recording / reproducing apparatus will be described. FIG. 4 is a flowchart showing a control procedure of the controller 10, the decoder circuit 9 and the encoder circuit 5 at the start of the additional recording according to claim 1 of the present invention.

At this time, the optical pickup 7 performs the reproduction process by tracking the vicinity of the recording end portion. First, in step 11, the decoder circuit 9 obtains a signal from the reproduction signal detection circuit 8, decodes the signal and converts it into data. Proceeding to step 12, it is determined whether the sector has linking information based on whether the data has dummy data. If the sector does not have the linking information in the determination of step 12, the processing of steps 11 to S12 is repeated.

If it is determined in step 12 that the sector has linking information, the process proceeds to step 13 to obtain the size up to the effective user data sector based on the linking information, and to start the additional writing from the current sector address. Is calculated.

Then, the flow advances to step 14 to create a sector in which dummy data is stored in the encoder circuit 5 so that valid data starts from the obtained sector address. Then, a dummy sector is output to the LD driver 6, and the process ends.

After this processing, the operation shifts to the recording operation processing by the encoder circuit 5 shown in FIG. And
The controller 10 controls the decoder circuit 9 (S11 to S11).
13), control switching between encoder circuits (S14 to S15) is performed.

In this manner, by performing the above-described additional recording control, it is possible to clarify the sector location where the next valid user data is stored on the optical disk medium 1 and perform additional recording.

Next, a reproducing process in the write-once optical disc recording / reproducing apparatus will be described. FIG. 5 is a diagram showing a control procedure of a reproducing operation in the decoder circuit 9 for decoding a sector near the additionally recorded area of the optical disc medium 1 according to claim 4 of the present invention.

First, at step 21, the reproduction signal detection circuit 8
, A reproduction signal is obtained in units of sectors, and the process proceeds to step 22 to determine whether or not a reproduction signal has been obtained. .

If a reproduced signal is obtained in the judgment of step 22, the process proceeds to step 23, where the reproduced signal is decoded,
Perform error correction. Thereafter, the process proceeds to step 24, where it is determined whether or not the sector is valid user data based on the linking information of the data.

If it is determined in step 24 that the data is valid user data, the flow advances to step 25 to send the data in the sector to the external host interface 4, and the flow returns to step 21 to repeat the processing control in steps 21 to 25. If the data is not valid user data in the determination of step 24, the process returns to step 21 to repeat the processing control of steps 21 to 24.

As described above, by executing the above-described reproduction control, the additionally recorded continuous data can be reproduced quickly except for the linking area and the sector area invalid as the user data.

Next, a description will be given of a control process when an address of a sector for storing valid user data at the time of additional writing is used as the linking information. First, a description will be given of a control procedure of a recording operation in the encoder circuit 5 for creating, modulating, and encoding sectors when performing additional recording according to claim 2 of the present invention.

In this control operation, first, recording data is obtained from the external host interface, it is checked whether or not there is any unprocessed recording data, and if so, error correction processing or the like is performed on the data. A sector is created, the sector is modulated and encoded, and input to the LD driver 6. Thereafter, the above-described control processing is repeatedly performed until the recording data ends.

On the other hand, when there is no more data to be recorded, the subsequent processing is executed as recording completion processing. First, the address of a sector for storing valid user data for the next additional writing as linking information is obtained, and the linking information is stored in the first sector, that is, in the first area of the user data area 14 shown in FIG. The rest creates sectors containing dummy data. Further, an error correction code is added to the sector, modulated, encoded, and input to the LD driver 6.

Then, it is determined whether the number of dummy data sectors to be recorded at the end of recording (completion) has been output to the LD driver 6 by a predetermined number based on the linking information. And the process of inputting the data to the LD driver 6 is repeatedly performed. Then, when the predetermined number of dummy data sectors are output, a completion notification is sent to the controller 10 which controls the entire system, and this processing ends.

Next, a control procedure of the controller 10, the decoder circuit 9 and the encoder circuit 5 at the start of the additional recording according to the second aspect of the present invention will be described. At this time, the optical pickup 7 performs the reproduction process by tracking the vicinity of the recording end portion.

First, the decoder circuit 9 obtains a signal from the reproduction signal detection circuit 8, decodes the signal and converts it into data.
It is determined whether or not the sector has linking information based on whether or not the data has dummy data. If the sector does not have linking information, the above processing is repeated.

If the sector has linking information in the above determination, the address of the sector for storing the effective user data for the next additional writing is obtained based on the linking information, and the obtained sector is sent to the encoder circuit 5. A sector storing dummy data is created so that valid data starts from the address, a dummy sector is output to the LD driver 6 at a predetermined additional write timing, and the process ends.

After this processing, the operation shifts to the recording operation processing according to claim 2 by the encoder circuit 5.
The controller 10 performs control switching between the decoder circuit 9 and the encoder circuit.

Next, a description will be given of a control procedure of a reproducing operation for the optical disk medium in which the linking information based on the sector address is recorded in the decoder circuit 9 of the write-once optical disk recording / reproducing apparatus.

First, a reproduction signal in sector units is obtained from the reproduction signal detection circuit 8, and it is determined whether or not the reproduction signal is obtained. If the reproduction signal is not obtained, the completion of reproduction is notified to the controller 10, and this processing is completed. I do.

When a reproduced signal is obtained in the above determination, decoding processing and error correction of the reproduced signal are performed. Thereafter, a sector of valid user data is read based on the linking information of the data, data in the sector is sent to the external host interface 4, and the above-described processing control is repeated.

In this way, by executing the above-described reproduction control, it is possible to rapidly reproduce only the effective user data continuously from the additionally recorded continuous data based on the linking information.

Next, control processing when a linking flag indicating the presence or absence of linking information is stored in a sector for storing the dummy data will be described. First, a description will be given of a control procedure of a recording operation in the encoder circuit 5 which creates, modulates and encodes a sector when performing additional recording according to claim 3 of the present invention.

In this control operation, first, print data is obtained from the external host interface, and it is checked whether or not there is any unprocessed print data. If so, error correction processing or the like is performed on the data. A sector is created, the sector is modulated and encoded, and input to the LD driver 6. Thereafter, the above-described control processing is repeatedly performed until the recording data ends.

On the other hand, when there is no more data to be recorded, the subsequent processing is executed as recording completion processing. First, the size of the dummy data and the size of the linking area are calculated, and the sum is obtained.

That is, the sum of the size of the sector for storing dummy data, which becomes invalid user data at the time of additional writing, and the size of the linking area is obtained from the current sector address, and the sum is made effective as user data at the next additional writing. The linking information indicates the size of the sector.

Thereafter, the process proceeds to step 4, where the linking information is stored in the first sector, that is, in the first area of the user data area 14 shown in FIG. 2, and the rest is created with dummy data. Further, an error correction code is added to the sector, modulated, encoded, and input to the LD driver 6.

Alternatively, the address of a sector for storing valid user data for the next additional writing as linking information is obtained, and the linking information is stored in the first sector, that is, the first area of the user data area 14 shown in FIG. , And the rest creates sectors containing dummy data. Further, an error correction code is added to the sector, modulated, encoded, and input to the LD driver 6.

It is determined whether dummy data sectors to be recorded at the end of recording (completion) have been output to the LD driver 6 by a predetermined number based on the linking information. And the process of inputting the data to the LD driver 6 is repeatedly performed. Then, when the predetermined number of dummy data sectors are output, a completion notification is sent to the controller 10 which controls the entire system, and this processing ends.

Next, the control procedure of the controller 10, the decoder circuit 9 and the encoder circuit 5 at the start of the additional recording according to claim 3 of the present invention will be described. At this time, the optical pickup 7 performs the reproduction process by tracking the vicinity of the recording end portion.

First, the decoder circuit 9 obtains a signal from the reproduction signal detection circuit 8, decodes the signal and converts it into data. It is determined whether the sector has linking information based on the linking flag in the data. If the sector does not have linking information, the above processing is repeated.

If the sector has linking information in the above determination, the size up to the effective user data sector is obtained based on the linking information, and the sector address of the position where the additional writing is started is calculated from the current sector address.

Then, a sector storing dummy data is created for the encoder circuit 5 so that valid data starts from the obtained sector address, and a dummy sector is output to the LD driver 6 in accordance with the additional writing timing. The process ends.

Alternatively, based on the linking information, an address of a sector for storing valid user data at the time of the next additional writing is obtained, and a dummy data is sent to the encoder circuit 5 so that the valid data starts from the obtained sector address. A sector in which data is stored is created, a dummy sector is output to the LD driver 6 at a predetermined write timing, and the process ends.

After this processing, the operation shifts to the recording operation processing according to claim 3 by the encoder circuit 5.
The controller 10 performs control switching between the decoder circuit 9 and the encoder circuit 5.

Next, a description will be given of a control procedure of a reproducing operation for the optical disk medium in which the linking flag is recorded together with the linking information based on the sector address in the decoder circuit 9 of the write-once type optical disk recording / reproducing apparatus.

First, a reproduction signal in sector units is obtained from the reproduction signal detection circuit 8, and it is determined whether or not the reproduction signal is obtained. If not, the completion of reproduction is notified to the controller 10, and this processing is terminated. I do.

When a reproduced signal is obtained by the above determination, decoding processing and error correction of the reproduced signal are performed. Thereafter, the presence or absence of linking information is determined based on the linking flag of the data. When there is linking information, a valid user data sector is read based on the linking information, and the data in the sector is sent to the external host interface 4. The above processing control is repeated.

As described above, by executing the above-described reproduction control, it is possible to easily and accurately obtain the existence of the linking area and the linking information thereof. Can be played back continuously and quickly.

[0074]

As described above, according to the write-once optical disc recording / reproducing apparatus according to the present invention, linking information is stored in a sector which is invalid as user data before a linking area when writing on a write-once optical disc. As a result, continuous reproduction of the additionally written user data can be quickly performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a write-once optical disc recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a format of a sector configuration of data recorded on the optical disc medium 1 shown in FIG.

FIG. 3 shows a control procedure of a recording operation in the encoder circuit 5 of the write-once optical disc recording / reproducing apparatus shown in FIG. 1, which creates, modulates and encodes a sector when performing additional recording according to claim 1 of the present invention. It is a flowchart.

FIG. 4 is a flowchart showing a control procedure of a controller 10, a decoder circuit 9, and an encoder circuit 5 of the write-once optical disc recording / reproducing apparatus shown in FIG. 1 at the start of additional recording according to claim 1 of the present invention.

FIG. 5 is a diagram showing a control procedure of a reproducing operation in the decoder circuit 9 of the write-once optical disc recording / reproducing apparatus shown in FIG. 1 for decoding sectors near the additionally recorded area of the optical disc medium 1 according to claim 4 of the present invention. It is.

FIG. 6 is a format diagram of a recording area for explaining additional recording on a write-once optical disc.

[Explanation of symbols]

 1: Optical disk media 2: Spindle motor 3: Servo circuit 4: External host interface 5: Encoder circuit 6: LD driver 7: Optical pickup 8: Reproduction signal detection circuit 9: Decoder circuit 10: Controller 11: ID area 12: IEC area 13: Linking flag area 14: User data area 15: EDC area

Claims (4)

[Claims] 1. A write-once optical disc recording / reproducing apparatus for additionally recording and reproducing data on a recordable optical disc, comprising: when data recording is completed, dummy data invalid as user data added before and after valid user data at the time of additional recording. In the first sector to be recorded, linking information based on the size of the sector for storing the dummy data and the size of the linking area is recorded, the linking information is read at the time of the next additional recording, and the effective user is read from the sector position based on the information. A write-once optical disc recording / reproducing apparatus, further comprising a write-once control means for starting data write-on. 2. The write-once optical disc recording / reproducing apparatus according to claim 1, further comprising means for recording, as the linking information, a sector for storing an address of a sector for storing valid user data for the next additional recording. Characteristic write-once optical disc recording / reproducing device. 3. The write-once optical disc recording / reproducing apparatus according to claim 1, further comprising: means for recording a sector having information indicating that the linking information is stored in a sector for storing the dummy data. A write-once optical disc recording / reproducing apparatus, characterized in that: 4. The write-once optical disc recording / reproducing apparatus according to claim 1, wherein the linking information is reproduced when reproducing at a write-once position of the recordable optical disc. A write-once optical disc recording / reproducing apparatus, comprising: a reproduction control means for resuming reproduction of valid user data from a sector position based on the data.