JP2007073187A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of continuously and correctly reading written data as if it is written by one write processing when reproduced even when data is written again from an interrupted position after temporary interruption. <P>SOLUTION: During pause write PW, a write control unit 34 stores current time information, information on EFM frames written based on a subcode sync to be written is stored in a built-in register, data is written to the end of the EFM frames to interrupt the write processing. During restart writing ReW, when time progresses to the writing interruption time, the control unit waits for the subcode synch based on the time information of ATIP or the time information of a subcode, and starts rewriting from the position of counting frame synchs corresponding to the number of EFM frames stored in a register at the time of writing interruption upon detection of the subcode synch. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that records and reproduces information on a data writable optical disc such as a CD-R / RW, a DVD-R / RW, and a DVD + RW.

  It is necessary to complete data recording on an optical disk capable of writing data, such as CD-R / RW, DVD-R / RW, DVD + RW, etc. in one writing operation, and the writing method is Track at Once. , Called Disc at Once. If the writing speed to the optical disk is faster than the data transfer speed from the host computer during this one writing operation, and the data to be written to the optical disk is interrupted, that is, if a buffer underrun occurs, Data writing will fail.

  The buffer underrun is more likely to occur as data is written at a higher speed. When the buffer underrun occurs, it is fatal for a medium that cannot be rewritten such as a CD-R. Conventionally, as a method for avoiding buffer underrun, the capacity of a buffer RAM (for example, composed of DRAM) is increased, or the data writing speed to the optical disk is made slower than the data transfer speed from the host computer. The method is taken.

On the other hand, when buffer underrun occurs rather than a buffer underrun avoidance method, data writing to the optical disk is interrupted once and a sufficient amount of data transferred from the host computer is accumulated in the buffer RAM. There is a technique for resuming writing from the position of the interrupted optical disc (see, for example, Patent Document 1), and data writing fails even when a fatal buffer underrun occurs in data writing processing to the optical disc. Thus, the data write operation can be normally terminated.
Japanese Patent Laid-Open No. 10-49990

  In such recording control, there is a possibility that the data recording operation to the optical disk is frequently stopped and restarted. Normally, data transferred from the host computer is once transferred to and held in the buffer RAM, and a predetermined parity or the like is encoded and added. Thereafter, the data is subjected to processing such as CIRC and EFM modulation, and is recorded on the optical disc as recording data. Currently, in a general optical disc apparatus, the capacity of the buffer RAM is about 512 Kbytes to 8 Mbytes.

  On the other hand, for example, the recording speed of a CD is 150 Kbyte / sec at the standard speed, and if the recording speed is increased as it is now, the recording speed is 2.4 Mbyte / sec at the 16-times speed, and the data once held in the buffer RAM. It takes a very limited time to record all of the above. That is, if no new data transfer is performed from the host computer during this time, the buffer underrun state occurs and the recording operation is suspended. Although the performance of the host computer connected to the optical disk device is improved, the recording operation is frequently paused and resumed to ensure stable operation on all host computers. Have to deal with.

  However, in situations where the recording operation is frequently stopped and restarted, if the end of the previous recording position is detected and control is performed to resume recording accurately from the end position, If there is a deviation between the absolute position information and the recorded data position, the deviation is accumulated, and if the deviation exceeds a certain value, recording cannot be resumed. That is, as described above, the maximum amount of data that can hold one data transfer from the host computer is the capacity of the buffer RAM, and from the host computer again until the data stored in the buffer RAM is recorded. If data transfer is not performed, the recording operation must be paused. The possibility of the above problem increases as the buffer RAM capacity decreases and as the recording speed onto the optical disk increases.

  The present invention has been made in order to solve such a problem. Even if the writing process is temporarily interrupted during the writing process and then the writing process is performed again from the interrupted position, the writing is performed once during the reproduction. An object of the present invention is to obtain an optical disc apparatus capable of reading data written continuously and normally in the same manner as the processing is performed.

  The optical disk apparatus according to the present invention is an optical disk apparatus that records and reproduces information on an optically writable optical disk on which address information indicating the position of an unrecorded data portion is formed in advance. A data storage unit that temporarily stores the write data for performing predetermined data processing, a data processing unit that performs predetermined data processing on the data stored in the data storage unit, and the data processing An encoder unit that modulates and outputs the write data processed in the unit by a predetermined method, and performs operation control of the data processing unit and the encoder unit and performs storage control of the write data in the data storage unit, The supply of write data to the write control unit that controls data writing to the optical disc and the data storage unit is interrupted. A write operation command unit that detects the occurrence of a state and issues an operation command to the write control unit according to the detection result, and the write control unit includes a data processing unit and an encoder unit when interrupting data writing to the optical disc In contrast, the access to the data storage unit is stopped after the access to the data storage unit is terminated, and access to the data storage unit is stopped and storage of the write data in the data storage unit is stopped.

  According to the optical disc apparatus of the present invention, when interrupting the data writing to the optical disc, the write control unit puts the data processing unit and the encoder unit into a standby state after the access to the data storage unit is completed, and enters the data storage unit. Access was stopped and storage of write data in the data storage unit was stopped. Thus, interleaving can be managed and disturbance of DSV calculation can be avoided, and even when the data writing process is resumed after temporarily interrupting the data writing process to the optical disk, the writing data Can be read out in the same manner as when writing is performed continuously without interruption.

  In addition, the write control unit may detect abnormality of various information read from the optical disc at the time of data writing, and if the abnormality is detected, the data writing process to the optical disc may be interrupted. This makes it possible to interrupt the writing process to the optical disk and prevent failure of data writing to the optical disk when an emergency stop is required during the writing process to the optical disk due to a spindle malfunction, tracking error, or the like. Can do.

  In this case, when the write control unit detects that the various types of information read from the optical disk are normal after the write control unit detects the abnormality and interrupts the data write process, the write control unit On the other hand, data writing is resumed from the writing end position when the data writing process is interrupted. For this reason, even when an emergency stop needs to be performed during the writing process to the optical disk due to a spindle malfunction, tracking error, or the like, the writing process to the optical disk can be performed normally.

  Furthermore, an end position information storage unit for storing information indicating the data writing end position on the optical disc is provided, and when the data writing to the optical disc is ended, the position information on the optical disc at the end is stored in the end position information storage unit. Stored. From this, it is possible to easily confirm the seek position and write start position when performing the rewrite process.

  Specifically, the write end position stored in the end position information storage unit is detected from the position information obtained from the data recorded on the optical disc. As described above, when the data recorded on the optical disk is read, timing signals indicating one sector or one frame are extracted according to the respective formats of CD-R / RW, DVD-R / RW, and DVD + R, and these timing signals are extracted. By using, it is possible to synchronize with data already written on the optical disc, and rewrite can be performed from the immediately preceding write end position.

  In addition, when writing data to an optical disc, in order to check whether the writing can be completed normally, the writing operation is not actually performed, but a test write which is a pseudo writing process is performed for a series of operation checks. There is a case. As with actual writing, when a buffer underrun occurs and data writing is interrupted and data is rewritten, test writing does not actually write to the optical disk. The detected data cannot be detected, and rewriting cannot be started. In such a case, writing to the optical disk is started by timing and using the absolute position information obtained from the wobble formed on the CD-R / RW, DVD-R / RW, or DVD + RW optical disk. Even when there is no data, rewriting can be performed normally.

  In addition, an inherent demodulation delay occurs when demodulating the wobble formed on the optical disk. It is necessary to correct the demodulation delay in order to connect the data accurately on the optical disc at the time of rewriting, and by making it possible to arbitrarily set the correction amount, regardless of differences in optical pickups, decoders, etc. The demodulation delay can be corrected, and accurate rewriting can be performed.

  Specifically, when writing data from the write end position, the write operation command unit uses the end position information stored in the end position information storage unit to perform a rewrite position and a seek position for performing rewrite. Can be decided.

  In addition, the current position on the optical disk and the end position information stored in the end position information storage unit may be compared, and a rewrite operation may be automatically performed when they match. It is possible to reduce the load on the write operation command unit used by the CPU or the like.

  In addition, when rewriting is not started normally due to a problem that the writing end position is not found when the writing end position stored in the end position information storage unit is detected, a re-seek is performed to retry the rewriting. If this is done, there is a possibility that the writing end position is found and rewriting is started while the reading state is unstable. When rewriting is retried, it is possible to prevent the start of rewriting in an unstable state by detecting the writing end position after the read state is stabilized after re-seeking.

  On the other hand, when the write end data and the rewrite data are pits, if a gap is formed at the data connection position due to the alignment error of the data connection at the time of rewriting, a space corresponding to the gap is formed. Since the PLL for reading data is also controlled by the minimum or maximum pit or space length determined by the standard, there is a possibility that the PLL will be disturbed if there is a space with a non-standard length. Therefore, by setting both the write end data and the rewrite data as spaces, it is possible to prevent the data reading PLL from being disturbed even if there is a gap between the data.

  Specifically, by setting the data connection position as the space of the EFM frame sync, the error in the write start position can be absorbed by the synchronization protection performed when the read data is demodulated, and accurate reproduction can be performed. Data writing processing that can be performed can be performed.

  In addition, since the CAV control is performed so that the clock signal serving as the reference clock at the time of data writing is PLL-locked to the wobble signal read from the optical disc in accordance with the rotation speed of the optical disc, the writing end position is also set. Since the rewrite position can also be adjusted using wobble, the error in the data connection position can be further reduced as compared with the case where CLV control is performed.

Next, the present invention will be described in detail based on the embodiments shown in the drawings.
First embodiment.
FIG. 1 is a block diagram showing a schematic configuration example of an optical disc apparatus according to the first embodiment of the present invention. FIG. 1 shows a CD-R as an example. In the following description, the sync pattern is abbreviated as sync.
In the optical disc apparatus 1 of FIG. 1, an optical pickup 3 that reads and writes data from and on an optical disc 2 includes a semiconductor laser, an optical system, a focus actuator, a track actuator, a light receiving element, a position sensor, and the like (not shown). It is built in and reads and writes data by irradiating the optical disk 2 with laser light.

  The data signal read by the optical pickup 3 is amplified and binarized by the read amplifier 4. The CD decoder 5 performs decoding by performing EFM demodulation and CIRC operation (deinterleaving, error correction, etc.) on the data amplified and binarized by the read amplifier 4, and the decoded data is music data (hereinafter referred to as “data for music”). In the case of CD data), it is D / A converted by the D / A converter 6 and output as an audio signal.

  The CD decoder 5 outputs the decoded CD data and personal computer data (hereinafter referred to as CD-ROM data) to the CD-ROM decoder 7. The CD-ROM decoder 7 stores the input data in the buffer RAM 9 as needed via the buffer manager 8 and performs error correction processing on the stored data in order to further improve the reliability of the data. Even in such a case, the data stored in the buffer RAM 9 is read and the data is transferred to and from the buffer RAM 9 by writing back the data by error correction through the buffer manager 8.

  Data for which the error correction processing has been completed by the CD-ROM decoder 7 is read out via the buffer manager 8 and transferred to the external host computer HC via the host interface 10. The host interface 10 performs an interface with the host computer HC, and conforms to a standard such as ATAPI or SCSI.

  On the other hand, the ATIP data is embedded in the unrecorded optical disc 2 in the manufacturing process, and when the data is written in the unrecorded portion of the optical disc 2, the ATIP data is read by the optical pickup 3. That is, a wobble signal on the optical disc 2 is read by the optical pickup 3, amplified by the read amplifier 4, binarized, and output to the ATIP decoder 11.

  The ATIP decoder 11 generates a synchronization signal (hereinafter referred to as ATIP sink), time information (hereinafter referred to as ATIP time information), and CRC calculation result of ATIP data (hereinafter referred to as ACRC result) from the input ATIP data. And output to the CD encoder 12. The CD encoder 12 uses the ATIP data input as important information for detecting the writing position on the optical disk 2 when writing data to an unrecorded portion of the optical disk 2. The CD encoder 12 enables writing from an accurate position on the optical disc 2 based on the ATIP sync and ATIP time information.

  Thus, in the unrecorded portion of the optical disc 2, time information indicating the position on the optical disc can be obtained only from the ATIP data. On the other hand, in the data recorded portion of the optical disc 2, the quality of the wobble signal is poor, and the ATIP decoder 11 may not be able to generate accurate ATIP sync and ATIP time information. However, sub-code data is recorded in the recorded part of the optical disc 2 together with a sub-code sync that forms a synchronization signal, and the CD decoder 5 processes the sub-code data to convert time information on the optical disc 2 into a CD encoder. 12 is output. As described above, when writing data to the recorded portion of the optical disc 2, the CD encoder 12 uses the subcode data to obtain time information indicating the position of the optical disc.

  Data for writing to the optical disc 2 is transferred from the host computer HC to the buffer RAM 9 via the buffer manager 8. The CD-ROM encoder 13 reads the data in the buffer RAM 9 via the buffer manager 8, adds an error correction code, EDC code, SYNC code, header information, etc., and writes it back to the buffer RAM 9.

  Further, the CD-ROM encoder 13 reads the prepared data from the buffer RAM 9 via the buffer manager 8 and writes it in a later-described CIRC calculation RAM section in the CD encoder 12. The CD encoder 12 performs CIRC operation on the data in the CIRC operation RAM unit, adds an error correction code and interleaves, and further performs EFM modulation on the completed data and outputs the result. Data output from the CD encoder 12 is recorded on the optical disc 2 via the laser control circuit 14 and the optical pickup 3.

  A wobble signal obtained from the optical disk 2 is input to the servo circuit 15 via the optical pickup 3 and the read amplifier 4, and a rotation control signal generated by the servo circuit 15 is supplied to the spindle motor 17 via the motor driver 16. Is done. The operation of the CD decoder 5, the CD-ROM decoder 7, the host interface 10, the ATIP decoder 11, the CD encoder 12 and the CD-ROM encoder 13 is controlled by the CPU 20.

  Here, FIG. 2 shows a format of a data writing unit of CD-R / RW defined in Orange Book. Normally, due to deinterleaving and synchronization pull-in at the time of reproduction of data recorded on the optical disc 2, it is not possible to read the data completely only by writing data in a user data block (User Data Block). Therefore, by providing 5 redundant blocks before the user data block and 2 redundant blocks after the user data block, the user data block is protected and data can be reliably read out.

  The five blocks before the user data block are composed of a link block (Link Block) LB and first to fourth run-in blocks (RIB1 to RIB4), and the two blocks after the user data block are the first block. 1 run-out block ROB1 and second run-out block ROB2.

FIG. 3 is a diagram showing a format example when the data shown in FIG. 2 is written in a plurality of times.
In FIG. 3, when data is written, data from the host computer HC is received, and when the data is filled in the buffer RAM 9, the CD encoder 12 executes a start write (Start Write) StartW.

  Further, the CD encoder 12 starts writing data to the optical disc 2, and when the data in the buffer RAM 9 becomes small and is likely to cause a buffer underrun, the CD encoder 12 executes a pause write PW to the optical disc 2. Pauses data writing. Thereafter, the CD encoder 12 waits for data transfer from the host computer HC. When the data is again filled in the buffer RAM 9, the CD encoder 12 executes a restart write (Restart Write) ReW and locates the position where the data write is paused by the pause write PW. Detect and start writing data continuously from that position.

  As described above, the CD encoder 12 suspends data writing by the pause write PW when the data in the buffer RAM 9 decreases, and repeats the process of resuming data writing by the restart write ReW when the buffer RAM 9 is filled again. . When all the write data from the host computer HC is written to the optical disc 2, the CD encoder 12 finally executes a stop write (Stop Write) StopW to complete the write process. By such data processing, it is possible to perform data writing as if one time of writing processing was performed, similarly to the format shown in FIG.

Here, an operation flow in the write control operation of each unit shown in FIG. 1 will be described.
First, the CPU 20 issues a start write (StartW) command, and the CD encoder 12 starts a writing operation on the optical disc 2. Next, the buffer manager 8 receives the data transferred from the host computer HC, and the data is stored in the buffer RAM 9. The CPU 20 transfers the data transferred from the host computer HC and stored in the buffer RAM 9 to a predetermined amount. A predetermined method is used to check whether or not the number has decreased.

  If the data stored in the buffer RAM 9 is not reduced to a predetermined amount, the CPU 20 determines whether or not the data writing to the optical disc 2 is completed according to a predetermined firmware. Then, a stop write (StopW) command is issued, and the writing process ends. If data writing to the optical disc 2 has not been completed, the CD encoder 12 continues the writing operation to the optical disc 2.

  On the other hand, when the CPU 20 determines that the data stored in the buffer RAM 9 has decreased to a predetermined amount, the CPU 20 issues a pause write (PW) command to the CD encoder 12 to interrupt the writing process to the optical disc 2. Next, the buffer manager 8 receives the data transferred from the host computer HC, and the data is stored in the buffer RAM 9. The CPU 20 transfers the data transferred from the host computer HC and stored in the buffer RAM 9 to a predetermined amount. A predetermined method is used to check whether it has become.

  When the CPU 20 determines that a predetermined amount of data has been stored in the buffer RAM 9, it issues a restart write (ReW) command to the CD encoder 12 to restart the writing process to the optical disc 2, and the buffer manager 8 Data transferred from the computer HC is received and stored in the buffer RAM 9. If the CPU 20 determines that a predetermined amount of data is not stored in the buffer RAM 9, the buffer manager 8 continues to receive the data transferred from the host computer HC and store it in the buffer RAM 9.

  As described above, when the CPU 20 receives a write command and a certain amount of data from the host computer HC, the CPU 20 issues a start write (StartW) command for starting data writing. The start write (StartW) command is a normal write sequence starting from the link block, and repeats a predetermined length of writing to the optical disc 2 and reception of data from the host computer HC. If the data transfer speed from the host computer HC is slower than the writing speed to the optical disc 2 during the writing process, the data in the buffer RAM 9 decreases and the writing process cannot be continued.

  Therefore, if the CPU 20 detects a decrease in the amount of data in the buffer RAM 9 and determines that the data transfer from the host computer HC is not in time, it issues a pause write (PW) command and interrupts the writing process. Let Note that when the writing process is interrupted by the pause write (PW) command, the writing sequence is temporarily interrupted without writing the run-out block.

  Thereafter, when the CPU 20 has received enough data from the host computer HC and stored in the buffer RAM 9, it issues a restart write (ReW) command. When performing a write process with a restart write (ReW) command, data is not written to the link block as in a normal write sequence, and continuity is maintained from the continuation of the data when the write process is interrupted, and This is a write sequence in which the writing process is accurately performed from the end of the writing data when the writing process is interrupted so that synchronization is not lost due to the writing position alignment. When predetermined data is written on the optical disc 2, the CPU 20 issues a stop write (StopW) command. When the write process is terminated by a stop write (StopW) command, this is a normal write sequence for writing a runout block.

  As described above, the optical disc apparatus 1 monitors the data amount of the buffer RAM 9 during the write sequence, and repeats the pause write PW and the restart ReW as needed to prevent a write failure due to a buffer underrun. By doing so, when data transfer from the host computer HC is not in time during data writing to the optical disc 2, the writing process is temporarily interrupted and data is sufficiently sent from the host computer HC. Resume writing data. Therefore, even if the data transfer from the host computer HC is temporarily interrupted or the transfer rate is lowered, the data can be normally written to the optical disc 2 in a plurality of times, and data writing failure is prevented. Can do. Further, the capacity of the buffer RAM 9 that absorbs the pulsation of data transfer can be reduced, and the cost of the optical disc apparatus 1 can be reduced.

Next, FIG. 4 is a schematic block diagram showing a configuration example of the CD encoder 12. The data writing operation of the CD encoder 12 on the optical disc 2 will be described in a little more detail with reference to FIG.
In FIG. 4, a CD encoder 12 includes a clock signal generation unit 30 including a clock generator composed of a PLL circuit, a CIRC calculation RAM unit 31, a CIRC calculation unit 32, an EFM encoder unit 33, and a write control unit. 34.

  The clock signal generation unit 30 generates a channel clock signal, which is a reference clock signal for writing required in the CD encoder 12, from a clock signal of, for example, 33.8688 MHz input from a crystal oscillator (not shown), and the CD encoder 12. Output to each part. The CIRC calculation RAM unit 31 temporarily stores the write data read from the buffer RAM 9 by the CD-ROM encoder 13 in order to perform CIRC calculation and the like.

  The CIRC operation unit 32 performs CIRC operation on the data stored in the CIRC operation RAM unit 31, further adds an error correction code and interleaves, and the EFM encoder unit 33 is processed by the CIRC operation unit 32. The data is EFM modulated by a predetermined method and output to the laser control circuit 14. Further, the write control unit 34 performs write control on the CD interface unit 35 that interfaces with the CD encoder 12 in the CIRC calculation unit 32, the EFM encoder unit 33, and the CD-ROM encoder 13 in accordance with a command from the CPU 20. Each control signal to be generated is generated and output.

  Specifically, the write controller 34 generates a predetermined write signal W when a start light (StartW) command is input from the CPU 20, and a predetermined pause signal when a pause light (PW) command is input from the CPU 20. P is generated and output to the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively. The write controller 34 generates a predetermined pause release signal PX when a restart light (ReW) command is input from the CPU 20, and a predetermined stop signal S when a stop light (StopW) command is input from the CPU 20. Are output to the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively. In FIG. 4, A indicates address data, D indicates data, Req indicates a request signal, and Ack indicates an acknowledge signal.

  In such a configuration, when a pause write (PW) command is output from the CPU 20, the write control unit 34 finishes writing to the CIRC calculation unit 32, EFM encoder unit 33, and CD interface unit 35 in advance. The writing process is continued until the EFM frame. After the writing process is performed until the end of the EFM frame, the writing process is interrupted. In addition, the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35 that access the CIRC calculation RAM unit 31 have completed the calculation and read processing required in the frame at the end of the EFM frame. In this state, a standby state is entered.

  In the standby state, the generation operation of the address data, data, request signal, and acknowledge signal between the CIRC calculation unit 32, the EFM encoder unit 33 and the CD interface unit 35, and the CIRC calculation RAM unit 31 is stopped. Further, the EFM encoder unit 33 stops outputting the write signals such as the EFM signal and the write gate signal WGATE. Since the output of the write gate signal WGATE is thus stopped, the data writing to the optical disc 2 is also interrupted.

  Here, when buffer underrun occurs, data writing to the optical disc 2 fails because the CIRC calculation unit 32 that generates the writing data cannot perform the same state at the time of rewriting. This is because the DSV (Digital Sum Value) calculation performed by the EFM encoder unit 33 is disturbed during the rewrite operation. When receiving a write interruption command from the CPU 20, each unit of the CD-ROM encoder 13, the CIRC calculation unit 32, and the EFM encoder unit 33 that accesses the CIRC calculation RAM unit 31 to generate write data is Interleaving can be managed by controlling to enter a standby state after the access is completed and to resume the operation at the start of rewriting. At the same time, the EFM encoder unit 33 is also set in the standby state, so that the disturbance of the DSV calculation can be avoided.

  When the restart light (ReW) command is output from the CPU 20 in the interrupted state, the write control unit 34 is in a standby state with the pause signal P after detecting the rewrite position as described later. Pause release signals PX are output to the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively. In this way, the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35 perform the subsequent processing from the standby state, and the output of the EFM signal and the write gate signal WGATE from the EFM encoder unit 33 is resumed. The By restarting the output of the write gate signal WGATE, data writing to the optical disc 2 is resumed from the continuation of the standby state.

  In this way, since writing is performed to maintain the continuity of the writing data at the writing end position and the rewriting start position of data on the optical disc 2, the writing operation is temporarily stopped and rewritten at the time of writing. Later, the data can be read out accurately and continuously.

FIG. 5 is a flowchart showing an example of a write control operation in the optical disc apparatus shown in FIGS.
In FIG. 5, the CPU 20 issues a start write (StartW) command to the write control unit 34 (step ST1), and the write control unit 34 sends a predetermined write signal W to the CIRC calculation unit 32, the EFM encoder unit 33, and The data is output to the CD interface unit 35 to start writing to the optical disk 2 (step ST2). Next, the buffer manager 8 receives the data transferred from the host computer HC, the data is stored in the buffer RAM 9 (step ST3), and the CPU 20 transfers the data transferred from the host computer HC and stored in the buffer RAM 9. Is determined by a predetermined method (step ST4).

  If it is not decreased to the predetermined amount in step ST4 (NO), the CPU 20 determines whether or not the data writing to the optical disc 2 is completed according to the predetermined firmware (step ST5). When data writing is completed in step ST5 (YES), the CPU 20 issues a stop write (StopW) command to the write control unit 34 (step ST6), and the write control unit 34 outputs a predetermined stop signal S. The data is output to the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively, and the writing operation to the optical disc 2 is finished (step ST7), and this flow is finished. If the process is not completed at step ST5 (NO), the process returns to step ST2.

  On the other hand, if it is determined in step ST4 that the amount has decreased to a predetermined amount (YES), the CPU 20 issues a pause write (PW) command to the write control unit 34 (step ST8), and the write control unit 34 The pause signal P is output to the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively, and the writing process to the optical disc 2 is interrupted (step ST9). Next, the buffer manager 8 receives the data transferred from the host computer HC, the data is stored in the buffer RAM 9 (step ST10), and the CPU 20 transfers the data transferred from the host computer HC and stored in the buffer RAM 9. Is reached by a predetermined method (step ST11).

  If it is determined in step ST11 that a predetermined amount of data has been stored (YES), the CPU 20 issues a restart write (ReW) command to the write control unit 34 (step ST12). The write control unit 34 outputs a predetermined pause release signal PX to the CIRC calculation unit 32, the EFM encoder unit 33, and the CD interface unit 35, respectively, and restarts the writing process on the optical disc 2 (step ST13), and step ST3. Return to. If it is determined in step ST11 that a predetermined amount of data is not stored (NO), the process returns to step ST10 and the writing process is continued.

Next, detection of the rewrite position will be described.
FIG. 6 is a diagram showing the positional relationship between the end of writing of data on the optical disc 2 and the start of writing as defined in the Orange Book. As shown in FIG. 6, the Orange Book allows a very large data overlap of 4 EFM frames. If there is such a large amount of data overlap, even in an optical disk device such as a CD having a high correction capability, frame synchronization is lost and normal reproduction cannot be performed. The reason for having such a large allowable value is to absorb the rotation control error of the spindle motor, and the next write start position is demodulated from the wobble signal regardless of the already written data. This is because it is decided at the sink.

  In order to reproduce the data without losing the synchronization at the connection part of the data recording, the format shown in FIG. 7 is taken in consideration of the frame synchronization protection window width. That is, in order to perform writing that can be reproduced without losing synchronization, it is necessary to form a data recording connection portion with a deviation of about ± 2 bit clock. Thus, it is difficult to determine an accurate data writing position by writing control based on the rotation control accuracy of the spindle motor as in the conventional optical disk apparatus.

  Therefore, in the optical disc apparatus 1 according to the first embodiment, when the pause write (PW) command is output from the CPU 20, the write control unit 34 writes the time information at that time and the subcode sync (S0 or S1) to be written. Is stored in a built-in register (not shown), data is written until the end of the EFM frame, and the writing process is interrupted. In the rewriting process in which the restart write (ReW) command is output from the CPU 20, the CPU 20 reads and confirms the position on the optical disc 2 where the data writing has been interrupted from the register of the write control unit 34, and before that position. Seek.

  After the seek is performed by the CPU 20, the write control unit 34 waits for the subcode sync (S 0 or S 1) from the time information of the ATIP or the time information of the subcode to the time when the writing is interrupted, and waits for the subcode. When sync is detected, the frame sync is waited for the number of EFM frames stored in the register when writing is interrupted. When writing is interrupted, the writing control unit 34 always performs processing so that writing is interrupted at the time when the frame sync is written. Therefore, when the rewriting is resumed after waiting for the demodulation delay time of the frame sync from that time, Can connect data accurately.

  FIG. 8 is a diagram showing the relationship between the subcode sync and frame sync on the optical disc 2 and the demodulated subcode sync and frame sync. The subcode sync and frame sync shown in FIG. 8 are signals obtained even when an inexpensive general-purpose LSI dedicated to the CD decoding function is used. As can be seen from FIG. 8, an inherent demodulation delay occurs when demodulating the subcode sync and the frame sync. When rewriting is performed, the demodulation delay needs to be corrected in order to connect the data accurately on the optical disc 2. By allowing the write control unit 34 to arbitrarily set the correction amount, it is possible to correct the demodulation delay regardless of differences in the optical pickup, decoder, etc., and accurate rewriting can be performed.

  On the other hand, when writing data to an optical disc, data is not actually written to check whether writing can be completed normally, but a pseudo writing process (hereinafter referred to as test write) is used to check a series of operations. Calling). In this case as well, since the test write does not write data to the optical disc 2 when performing the interruption and rewrite processing when the buffer underrun occurs as in the actual writing processing, the optical disc as described above Data already recorded in 2 cannot be detected, and rewriting cannot be started. In such a case, writing is started at the timing of the wobble signal on the CD-R / RW, DVD-R / RW, or DVD + RW optical disk, so that it is normal even when there is no write data on the optical disk 2. Can be rewritten.

  FIG. 9 is a diagram showing the relationship between the ATIP sync on the optical disc 2 and the demodulated ATIP sync. As can be seen from FIG. 9, in the case where the alignment is performed using the ATIP sync when performing the test write, an inherent demodulation delay occurs when demodulating the wobble signal. When rewriting is performed, the demodulation delay needs to be corrected in order to connect the data accurately on the optical disc 2. By allowing the write control unit 34 to arbitrarily set the correction amount, it is possible to correct the demodulation delay regardless of differences in the optical pickup, decoder, etc., and accurate rewriting can be performed.

  Also, as shown in FIG. 10, when both the write end data and the rewrite data are pits, if a gap due to an alignment error is opened at the data joint at the time of rewrite, there is no illegal space corresponding to the gap, that is, no pits. A state is made. Since the PLL for reading data in the CD decoder 5 is controlled even by the minimum or maximum pit or space length determined by the standard, there is a possibility that a space having a non-standard length may be disturbed. Therefore, by setting both the write end data and the rewrite data as spaces, the above-described problem can be avoided even if there is a gap between the data.

  Also, as shown in FIG. 11, two types of EFM data actually recorded on the optical disc 2 are generated from the EFM code, and when the margin bit starts with a space and the sync code starts with a pit, the EFM data is connected with the margin bit. . Therefore, a margin bit having a predetermined length, usually 3T (T indicates one cycle of the clock signal CK) in FIG. 11, is 3T or more due to rotational fluctuation of the spindle motor or synchronization deviation. Even in this case, if the sync pattern can be recognized by the synchronization protection in the CD decoder 5, it can be read normally. That is, both subcode data and main data can be read without error. The clock signal CK in FIGS. 10 and 11 indicates a channel clock signal.

  In general, the CD decoder 5 performs synchronization protection on the sync portion and error correction on the data portion in consideration of reading failure when reading data. In order to perform such synchronization protection, it is better to connect the data at the sync portion. Further, by the function of connecting the data in the space of the sync pattern as described above, the write alignment error can be eliminated by using the synchronization protection function of the CD decoder 5.

  In the above description, the case where data is written to the optical disc by CLV control has been described as an example. Since the CLV control is performed, there arises a problem of how to make the gap between the data joints and the data joint as described above. As described above, since the CLV control performs the rotation control with the writing system clock, there is a possibility that the alignment error at the data joint is inevitably caused by the rotation control error of the spindle motor and the phase difference between the reading system and the writing system clock. There is. Further, there is a problem that a sampling error occurs even if the rotation fluctuation of the optical disk due to the phase difference between the read clock and the write clock is minimized.

  On the other hand, in the CAV control in which the PLL is locked to the wobble signal read from the optical disk in accordance with the rotation speed of the optical disk, the write end position and the rewrite position can be matched with the wobble signal. In this case, the alignment error at the data joint can be reduced. In the CAV control, the writing clock follows the spindle motor movement, so that the rotation fluctuation of the optical disk can be ignored at all, and the reading system and the writing system can be synchronized. The generation of errors can also be suppressed.

  When CAV control is performed, the clock signal generator 30 shown in FIG. 4 is input via the ATIP decoder 11 instead of the 33.8688 MHz clock signal input from the crystal oscillator (not shown). A digitized wobble signal is input. The clock signal generation unit 30 generates a channel clock signal from the input wobble signal and outputs it to each unit in the CD encoder 12.

  As described above, in the optical disc apparatus according to the first embodiment, the write control unit 34 at the time of pause write PW and the time information at that time and the information on how many EFM frames have been written based on the subcode sync to be written. Is stored in the built-in register, data is written until the end of the EFM frame, and the writing process is interrupted. At the time of restart write ReW, the time when the writing is interrupted from the ATIP time information or the subcode time information The process waits for the subcode sync, and when the subcode sync is detected, rewriting is started from the position where the frame sync is counted for the number of EFM frames stored in the register when the writing is interrupted. From this, it is possible to connect the data accurately on the optical disc at the time of rewriting, and when data is interrupted and written again when a buffer underrun occurs, it seems as if data was written continuously. Can be rewritten.

Second embodiment.
In the first embodiment, when a buffer underrun occurs during data writing processing to the optical disc, the writing processing is temporarily interrupted, data is received from the host computer, and data writing processing is performed again on the optical disc. I made it. On the other hand, during the data writing process on the optical disk, the wobble signal read from the optical disk may not be demodulated normally due to a track jump caused by an impact on the optical disk device and / or a scratch on the optical disk.

  For this reason, in the optical disk apparatus according to the first embodiment, even when an emergency write process stop factor such as a tracking error or spindle abnormality is detected, the write process is temporarily interrupted and the cause is canceled. Data writing processing on the optical disc may be performed again, and this is the second embodiment of the present invention.

  FIG. 12 is a block diagram showing a schematic configuration example of an optical disc apparatus according to the second embodiment of the present invention. FIG. 2 also shows a CD-R as an example. In FIG. 12, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted here, and only differences from FIG. 12 are described.

  12 differs from FIG. 1 in that when the ATIP decoder 11 and the servo circuit 15 in FIG. 1 cannot normally demodulate the wobble signal read from the optical disk due to out-of-tracking, spindle abnormality, or the like. The signal indicating the occurrence of abnormality is output to the encoder 12 to interrupt the data writing process to the optical disc 2, so that the ATIP decoder 11 in FIG. 1 is changed to the ATIP decoder 11a, and the CD encoder 12 in FIG. Is the CD encoder 12a, the servo circuit 15 of FIG. 1 is the servo circuit 15a, and the optical disk apparatus 1 of FIG. 1 is changed to the optical disk apparatus 1a.

  In FIG. 12, when the servo circuit 15a cannot normally demodulate the wobble signal due to scratches or the like on the optical disk and cannot perform normal servo control, the servo circuit 15a outputs a signal indicating the abnormality to the CD encoder 12a. 12a immediately stops the data writing process to the optical disc 2 and performs pause writing. At this time, the ATIP decoder 11a also outputs a signal indicating the abnormality to the CD encoder 12a. However, the ATIP decoder 11a detects that an abnormality has occurred after reading the wobble signal to some extent and outputs it to the CD encoder 12a. Therefore, the abnormal signal from the servo circuit 15a is input to the CD encoder 12a earlier than the ATIP decoder 11a.

  On the other hand, when a track jump occurs due to an impact or the like, the CD encoder 12a detects an abnormality in the ATIP time information decoded and input by the ATIP decoder 11a, and immediately writes data to the optical disc 2 when the abnormality is detected. Stop processing and perform pause light. At this time, a signal indicating the servo abnormality is also input from the servo circuit 15a for a moment. However, since the time during which the signal is input is very short, the CD encoder 12a immediately applies the signal to the optical disc 2 in response to the abnormality signal. There is a case where the data writing process is stopped and no pause writing is performed.

FIG. 13 is a schematic block diagram showing a configuration example of the CD encoder 12a. In FIG. 13, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted here, and only differences from FIG. 4 are described.
In FIG. 13, the CD encoder 12a includes a clock signal generation unit 30, a CIRC calculation RAM unit 31, a CIRC calculation unit 32, an EFM encoder unit 33, and a write control unit 34a.

  The write control unit 34a detects an emergency write process stop factor such as an out-of-tracking or spindle error from the ATIP time information and ATIP error signal input from the ATIP decoder 11a and the servo error signal input from the servo circuit 15a. Then, the pause write described in the first embodiment is performed, and the data writing process is interrupted. At this time, the write control unit 34a performs the same operation as the operation performed when the write control unit 34 according to the first embodiment outputs a pause write command from the CPU 20. Furthermore, the write controller 34a writes a status (not shown) indicating that the data write process has been interrupted. The CPU 20 reads the status written in the register of the write control unit 34a, and recognizes that the write control unit 34a has performed a pause write.

  Further, when the write control unit 34a determines from the ATIP time information and the ATIP abnormal signal input from the ATIP decoder 11a, the servo abnormal signal input from the servo circuit 15a, etc. that the urgent write processing stop factor has disappeared, A status indicating that the cause of the stop of the writing process has been eliminated is written to the built-in register. The CPU 20 reads the status written in the register of the write control unit 34a, recognizes that there is no urgent write processing stop factor, and outputs a restart write command to the write control unit 34a.

  The write control unit 34a performs the same operation as the operation performed when the write control unit 34 according to the first embodiment outputs a restart write command from the CPU 20. In the ATIP decoder 11a, the servo circuit 15a, and the write control unit 34a, the operations except for this are the same as those of the ATIP decoder 11, the servo circuit 15, and the write control unit 34 in the first embodiment, and the description thereof is omitted.

  Here, the following cases can be considered as an emergency stop factor for the data writing process to the optical disc. When the continuity of the ATIP time information input from the ATIP decoder 11a is interrupted, that is, the write control unit 34a compares the complementary data with the demodulated data, and the ACRC result is OK but does not match the complementary data. In this case, it is assumed that continuity is interrupted, and pause light is performed. Further, the write control unit 34a executes pause write when the number of consecutive times that the ACRC result is NG exceeds a preset allowable number.

  When the ATIP sink to be detected cannot be detected, the ATIP decoder 11a performs interpolation of the ATIP sink. If the interpolation exceeds the allowable number, the ATIP decoder 11a outputs a predetermined ATIP abnormality signal to the write control unit 34a and writes it. When the ATIP abnormality signal is input, the control unit 34a executes pause light. Further, the ATIP sync is defined such that the deviation amount is within a prescribed value with respect to the subcode sync written to the optical disc, and the write control unit 34a executes the pause write when the deviation amount exceeds the prescribed value. . Specifically, for example, when the ATIP sink cannot be detected in a window indicating a ± 2 EFM frame defined by the Orange Book, the writing control unit 34a executes pause writing.

  On the other hand, when the phase comparison result of the spindle servo exceeds the allowable number, the servo circuit 15a outputs a predetermined servo abnormality signal to the write control unit 34a, and the write control unit 34a executes pause write. In addition, the servo circuit 15a detects an impact on a portion of the optical disc that is driven, and when the impact is detected, outputs a predetermined signal to the write control unit 34a, and the write control unit 34a executes a pause write.

FIG. 14 is a flowchart showing an example of a write control operation in the optical disc apparatus shown in FIGS. In FIG. 14, the flow for performing the same processing as in FIG. 5 except that the write control unit 34 in FIG. 4 is replaced by the write control unit 34a is indicated by the same reference numerals as in FIG. Only the differences from 5 will be described.
14 differs from FIG. 5 in that step ST21 between step ST1 and step ST2 in FIG. 5, step ST22 between step ST2 and step ST3 in FIG. 5, and step ST3 and step in FIG. Step ST23 is provided between ST4 and ST4, and step ST24 is provided between step ST9 and step ST10 in FIG.

  In FIG. 14, after performing the process of step ST1 of FIG. 5, the write control unit 34a detects an emergency write process stop factor such as an out-of-tracking or spindle abnormality from the signals input from the ATIP decoder 11a and the servo circuit 15a. The presence or absence of occurrence is determined (step ST21). If it is determined in step ST21 that an urgent write process stop factor has occurred (YES), the process proceeds to step ST9 in FIG. If it is determined in step ST21 that an urgent write process stop factor has not occurred (NO), after performing the process of step ST2 in FIG. 5, the write control unit 34a again receives the ATIP decoder 11a and the servo circuit 15a. From the input signal, it is determined whether or not an urgent write processing stop factor such as a tracking error or spindle abnormality has occurred (step ST22).

  If it is determined in step ST22 that an urgent write process stop factor has occurred (YES), the process proceeds to step ST9 in FIG. If it is determined in step ST22 that there is no urgent write process stop factor (NO), after performing the process of step ST3 in FIG. 5, the write control unit 34a again receives the ATIP decoder 11a and the servo circuit 15a from the process. From the input signal, it is determined whether or not an urgent write processing stop factor such as a tracking error or spindle abnormality has occurred (step ST23).

  If it is determined in step ST23 that an urgent write process stop factor has occurred (YES), the process proceeds to step ST9. If it is determined in step ST23 that no urgent write process stop factor has occurred (NO), after performing the processes in steps ST4 to ST7 in FIG. 5, this flow ends, and data write ends in step ST5. If not (NO), the process returns to step ST21.

  In addition, after performing the process of step ST9 in FIG. 5, the write control unit 34a generates an emergency write process stop factor such as an out-of-tracking or spindle abnormality from the signals input from the ATIP decoder 11a and the servo circuit 15a. The presence / absence is determined (step ST24). If it is determined in step ST24 that an urgent write process stop factor has occurred (YES), the process of step ST24 is performed. If it is determined in step ST24 that there is no urgent write process stop factor (NO), the process returns to step ST22 after performing the processes of steps ST10 to ST13 in FIG.

  As described above, the optical disc apparatus according to the second embodiment is out of tracking or spindle abnormality based on the ATIP time information and ATIP abnormality signal input from the ATIP decoder 11 or the servo abnormality signal input from the servo circuit 15a. When the urgent write process stop factor is detected, the pause write described in the first embodiment is performed to interrupt the data write process, and when the urgent write process stop factor disappears, the first embodiment The restart light explained in (1) was performed. Therefore, even when an emergency stop needs to be performed during the writing process on the optical disk due to spindle abnormality, tracking error, or the like, the writing process to the optical disk can be performed normally.

1 is a block diagram showing a schematic configuration example of an optical disc device according to a first embodiment of the present invention. It is the figure which showed the format of the data writing unit of CD-R / RW prescribed | regulated to the orange book. FIG. 3 is a diagram showing a format example when the data shown in FIG. 2 is written in a plurality of times. FIG. 2 is a schematic block diagram illustrating a configuration example of a CD encoder 12 in FIG. 1. 5 is a flowchart showing an example of a write control operation in the optical disc apparatus shown in FIGS. 1 and 4. It is a figure which shows the positional relationship of the writing end of data on the optical disk 2, and the writing start prescribed | regulated by the orange book. 6 is a diagram showing an example of forming a data joint on the optical disc 2. FIG. FIG. 5 is a diagram illustrating a relationship between a subcode sync and a frame sync on the optical disc 2 and a demodulated subcode sync and a frame sync. FIG. 4 is a diagram showing a relationship between an ATIP sync on the optical disc 2 and a demodulated ATIP sync. 6 is a diagram showing an example of a state of data connection on the optical disc 2. FIG. 4 is a diagram showing an example of EFM data recorded on an optical disc 2. FIG. It is the block diagram which showed the example of a schematic structure of the optical disk apparatus in the 2nd Embodiment of this invention. FIG. 13 is a schematic block diagram showing a configuration example of a CD encoder 12a in FIG. 14 is a flowchart showing an example of a write control operation in the optical disc apparatus shown in FIGS. 12 and 13.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a Optical disk apparatus 2 Optical disk 3 Optical pick-up 4 Read amplifier 5 CD decoder 8 Buffer manager 9 Buffer RAM
DESCRIPTION OF SYMBOLS 10 Host interface 11, 11a ATIP decoder 12, 12a CD encoder 13 CD-ROM encoder 14 Laser control circuit 20 CPU
30 Clock signal generation unit 31 RAM unit for CIRC operation 32 CIRC operation unit 33 EFM encoder unit 34, 34a Write control unit 35 CD interface unit 15a Servo circuit

Claims (1)

In an optical disc apparatus that records and reproduces information with respect to a data writable optical disc in which address information indicating the position of an unrecorded portion of data is formed in advance.
A data storage unit for temporarily storing data for writing to the optical disk transferred from the outside in order to perform predetermined data processing;
A data processing unit that performs predetermined data processing on the data stored in the data storage unit;
An encoder unit that modulates the data for writing processed by the data processing unit by a predetermined method;
A write control unit that performs operation control of the data processing unit and the encoder unit and performs storage control of data to be written to the data storage unit, and performs data writing control on the optical disc;
A write operation command unit that detects occurrence of a state in which supply of write data to the data storage unit is interrupted, and issues an operation command to the write control unit according to the detection result;
With
When the data writing to the optical disk is interrupted, the write control unit puts the data processing unit and the encoder unit in a standby state after the access to the data storage unit is finished, stops access to the data storage unit, and stores data. An optical disc apparatus characterized in that storage of data for writing in a recording unit is stopped.

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