JP4026408B2 - Optical disc apparatus and optical disc recording method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an information recording apparatus for additionally recording information on a recordable information recording medium. In particular, recording on an optical disk is interrupted when a buffer underrun state is reached, and recording onto an optical disk is performed when a buffer underrun resolution state is reached. The present invention relates to an optical disc apparatus that resumes recording and an optical disc recording method.
[0002]
[Prior art]
  Recording on an information recording medium such as a recordable optical disk is performed by irradiating the information recording medium with a laser from an optical head and changing the reflectance of the optical disk.
[0003]
  When recording, the input data for recording is transferred from the host computer to the optical disk device, and once stored in the input data buffer memory, the data is read out. Furthermore, recording is performed by irradiating an information recording medium with a laser from an optical head.
[0004]
  In many cases, there is no balance between the transfer rate at which this input data is transferred from the host computer to the optical disc apparatus and the transfer rate (recording speed) from the optical head to the information recording medium. For example, a case where the transfer rate from the host computer becomes slow also occurs quite frequently. If an unbalanced state in which the transfer rate of the input data from the host computer is slower than the transfer rate recorded on this information recording medium continues, a buffer memory state called buffer underrun is caused. The When this state occurs, the data recorded on the information recording medium is interrupted, and the recorded information recording medium cannot be used.
[0005]
  In order to avoid the occurrence of such a buffer underrun, conventionally, processing was performed by the following technique. For example, the remaining amount stored in the input data buffer memory is monitored, and if it is determined that a buffer underrun occurs, the recording operation is temporarily interrupted. When it is determined that new data is accumulated in the buffer memory for input data and the buffer underrun condition is avoided, the recording is started from the position where the recording is interrupted so as to be continuous with the data immediately before the recording is interrupted. To resume. A position where recording is interrupted / resumed when this buffer underrun occurs is conventionally performed, for example, in units of EFM (Eight to Fourteen Modulation) frames (see JP-A-10-49990, Japanese Patent No. 3163064). ).
[0006]
[Problems to be solved by the invention]
  However, the recording principle of the information recording medium is that the optical energy of the laser irradiated from the optical pickup is absorbed by the recording film and converted into thermal energy, and the temperature on the recording film surface is changed to locally change the optical characteristics of the medium. Pits corresponding to the recording data are formed. Therefore, when suspending / resuming recording on the information recording medium, the shape of the end due to a transient structural change at the start / end of the pit (due to heat dissipation on the recording film and heating delay due to the rising characteristics of the laser) It is inevitable that a discontinuity point in the pit connection portion is formed. For this reason, a change at the start / end cannot be detected sharply during playback, and playback may not be possible.
[0007]
  In addition, since recording is interrupted in units of frames, recording restart is performed from the beginning of the frame. If the position of the frame sync signal is shifted and recorded due to a control error of the spindle motor at the time of resuming recording, synchronization cannot be achieved at the time of reading, and read data after resuming recording becomes error data. Even in such a case, reproduction may not be possible.
[0008]
  In order to solve the above-described problems, an object of the present invention is to provide an optical disc apparatus that can greatly reduce the possibility that correction of a read error due to a recording start position shift at the time of resuming recording becomes impossible. And
[0009]
[Means for Solving the Problems]
  The present invention has been made to solve the above-described problem. In an optical disc apparatus capable of recording information on an optical disc, the amount of data to be recorded is monitored, and when the data amount falls below a predetermined amount, a buffer underrun occurs. A buffer underrun detecting means for determining a run state, a recording interruption resuming means for performing recording on the optical disk at a desired position, a time information storing means for storing information of the last recording time or address, and an optical disk Already recorded inTheIt has synchronization means for synchronizing with a predetermined clock signal and modulation means for modulating and outputting information to be recorded in synchronization with the predetermined clock signal, and tries to resume the information already recorded on the optical disk and recording. The optical disc apparatus and the optical disc recording method are characterized in that recording is resumed by providing a predetermined interval with the information to be recorded, and the predetermined interval is a space that appears at the beginning when recording is resumed.
[0010]
  According to the present invention, it is possible to provide an optical disc apparatus and an optical disc recording method capable of greatly reducing the possibility that correction of a read error due to a recording start position shift at the time of resuming recording becomes impossible.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
  In order to solve the above problems, a first invention is an optical disk that can be recorded by laser light having a predetermined optical power, a rotation driving means that rotationally drives the optical disk, and recording from the optical disk by irradiating the optical disk with laser light. An optical pickup for reproducing information or recording information on an optical disc, a laser control means for controlling the optical power of the laser light to be irradiated, a demodulating means for binarizing and demodulating the reproduced signal, and a wobble signal from the reproduced signal And an ATIP demodulating means for demodulating ATIP and capable of recording information on the optical disk, and monitoring the amount of data to be recorded, and when the amount of data is less than a predetermined amount, A buffer underrun detecting means for judging, a recording interruption resuming means for recording at a desired position on the optical disc, and a recording And time information storing means for storing the last time or address information in which the cross-sectional, information already recorded on the optical diskTheIt has synchronization means for synchronizing with a predetermined clock signal and modulation means for modulating and outputting information to be recorded in synchronization with the predetermined clock signal, and tries to resume the information already recorded on the optical disk and recording. The optical disc apparatus is characterized in that recording is resumed by providing a predetermined interval with the information to be recorded, and the predetermined interval is a space that appears at the beginning when recording is resumed.
[0012]
  According to the present invention, since a space is provided at a predetermined interval between recording interruption and resumption, normal edges are formed in the two front and rear pits. Therefore, there are discontinuous points in the recording interruption / resumption sequence. It will not occur. In this way, it is possible to provide an optical disc apparatus that can greatly reduce the possibility that correction of a read error due to a recording start position shift at the time of resuming recording becomes impossible.
[0013]
  According to a second aspect of the present invention, there is provided an optical disc that can be recorded with a laser beam having a predetermined optical power, a rotation drive unit that rotationally drives the optical disc, and a laser beam applied to the optical disc to reproduce recorded information from the optical disc. Alternatively, an optical pickup for recording information on the optical disc, laser control means for controlling the optical power of the irradiated laser light, demodulation means for binarizing and demodulating the reproduced signal, and extracting a wobble signal from the reproduced signal And an ATIP demodulating means for demodulating ATIP, and capable of recording information on the optical disc, monitoring the amount of data to be recorded and determining a buffer underrun state when the amount is less than a predetermined amount Buffer underrun detection means, recording interruption resumption means for recording on the optical disk at a desired position, and recording interruption And time information storage means for the last time or storage information address, information already recorded on the optical diskTheIt has synchronization means for synchronizing with a predetermined clock signal and modulation means for modulating and outputting information to be recorded in synchronization with the predetermined clock signal, and tries to resume the information already recorded on the optical disk and recording. Recording is resumed with a predetermined interval between the information and the information to be recorded, and the predetermined interval is within the range from the end of one frame to the maximum correctable number of the optical disk, and recording is performed. An optical disc apparatus characterized by a space appearing at the beginning when resuming.
[0014]
  According to the present invention, since the link position where the recording is interrupted is arranged between the pit and the space within the range that goes back from the end in one frame to the maximum correctable number of the optical disc, the front and rear 2 A normal edge is formed in one pit, and there is no occurrence of a discontinuous point of recording interruption / resumption. In this way, even if a read error due to a recording start position shift at the time of resuming recording occurs, error correction is possible, and discontinuous points do not occur in a series of operations of recording interruption and resumption. Therefore, it is possible to provide an optical disc apparatus capable of greatly reducing the possibility that correction of a read error due to recording interruption / resumption becomes impossible.
[0015]
  The second3According to the present invention, a rewritable optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotationally driving the optical disc, and reproducing recorded information from the optical disc by irradiating the optical disc with laser light, or information on the optical disc. An optical pickup for recording or erasing, a laser control means for controlling the optical power of the irradiated laser light to control the recording operation and the erasing operation of the optical pickup, and a demodulating means for binarizing and demodulating the reproduced signal And an ATIP demodulator for extracting a wobble signal from a reproduced signal and demodulating the ATIP, and capable of recording information on the optical disc, monitoring the amount of data to be recorded and measuring a predetermined amount of data Buffer underrun detection means for determining a buffer underrun state when the Recording interruption and resuming means, and time information storage means for storing information for the last time or address the recording interruption, information already recorded on the optical disk carried out inTheSynchronizing means for synchronizing with a predetermined clock signal, and synchronizing the data to be recorded with the predetermined clock signal for modulating or outputting data corresponding to the length of the portion to be erased with the predetermined clock signal Modulation means for modulating the output, and when the buffer underrun detection means determines that the buffer underrun state is detected and the recording interruption resumption means detects the recording interruption position, the recording is interrupted at the pit end position and the recording is interrupted. After that, the maximum pit length according to the optical disc standard is initialized immediately after the end position of the pit, and when it is determined that the buffer underrun detection means has avoided the buffer underrun state, the information and recording already recorded on the optical disc are recorded. Synchronize with the information to be resumed, and when the recording resumes in the initialized area An optical disk apparatus characterized by a recording restart from space appearing on.
[0016]
  According to the present invention, since the link position is set between the pit and the space and the range longer than the longest pit length (space length) is initialized in advance when recording is interrupted, the end of the pit becomes a complete pit edge. In addition, it is only necessary to activate the laser during the space period until the next pit is formed and activate the write pulse at the pit formation resumption timing, so discontinuity occurs when resuming recording from recording interruption. Nothing will happen. Further, when recording is resumed, it is not necessary to control the irradiation timing with high accuracy as the laser activation timing. In this way, it is possible to provide an optical disc apparatus that can greatly reduce the possibility that correction of read errors due to recording interruption / resumption becomes impossible.
[0017]
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
  (Embodiment 1)
  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating an optical disc apparatus according to the present invention. In FIG. 1, each component will be described.
[0019]
  Reference numeral 101 denotes an optical disc as an information recording medium for recording data. More specifically, it is an optical disc such as a CD-R, CD-RW, DVD-R, and DVD-RW, and has an recordable information recording layer. In the following description, a CD-R (CD-Recordable) or CD-RW (CD-Rewritable) based on the CD standard will be described as an example. Reference numeral 102 denotes a spindle motor serving as a rotational driving means for rotationally driving the optical disc 101. An optical pickup 103 irradiates a recording surface of the optical disc 101 with laser light and records it on the optical disc 101 or detects reflected light from the optical disc 101 to reproduce information.
[0020]
  Reference numeral 104 denotes an RF amplifier, which amplifies the RF signal obtained from the optical pickup 103 and outputs it. Reference numeral 105 denotes a CD decoder as demodulation means, which binarizes and demodulates the signal obtained from the RF amplifier 104. Reference numeral 106 denotes an ATIP decoder as ATIP demodulating means, which extracts a wobble signal from a pre-groove signal of the optical disk 101 obtained from the RF amplifier 104 and demodulates ATIP (Absolute Time In Pre-groove).
[0021]
  Reference numeral 107 denotes a servo circuit, focus control for focusing the laser beam emitted from the optical pickup 103 on the recording surface of the optical disc 101, tracking control for causing the laser beam to follow the track of the optical disc 101, and the optical pickup 103 in the radial direction. Traverse control for moving and spindle control for rotating the spindle motor 102 at a constant linear velocity are performed.
[0022]
  Reference numeral 108 denotes a recording interruption / resumption circuit as recording interruption / resumption means, which interrupts and resumes recording on the optical disc 101 at a desired position. Reference numeral 109 denotes a time information memory serving as a time information storage unit, which stores time information and a frame number of the last frame recorded immediately before recording is interrupted. According to the CD standard, time information can be directly converted into address information, so time information and address information are synonymous in terms of control. Reference numeral 110 denotes a CIRC (Cross Interleave Reed-Solomon Code) data memory, which stores recorded data satisfying the CIRC interleave length necessary for resuming recording. That is, the recording data is stored in the CIRC data memory 110 simultaneously with the recording operation. Reference numeral 111 denotes a buffer underrun detection circuit as buffer underrun detection means. The buffer underrun detection circuit monitors the amount of data in the buffer RAM 115 and determines that the buffer underrun state is present when the remaining amount of data falls below a certain value. When the remaining amount of data in the buffer RAM 115 exceeds a certain fixed value, it is determined that the buffer underrun state has been resolved.
[0023]
  Here, the host PC 117 is a personal computer to which the optical disk device is connected, and the interface circuit 116 is an interface for connecting to the host PC 117. The buffer RAM 115 temporarily stores recording data sent from the host PC 117 via the interface circuit 116.
[0024]
  Reference numeral 112 denotes a synchronization circuit as synchronization means, which synchronizes data already recorded on the optical disc 101 with a reference clock in the optical disc apparatus. Reference numeral 113 denotes a CD encoder as modulation means, which modulates and outputs recording data of information to be recorded in synchronization with a predetermined reference clock signal in the optical disc apparatus. At this time, since the recording data has a data structure in which pits to be formed (see reference numeral 201 in FIG. 2) are sequentially arranged in synchronization with the reference clock, a pit forming position and a blank (no pit forming) position This information is grasped based on the reference clock. Reference numeral 114 denotes a laser control circuit as laser control means, which controls the optical power that is the output of the laser light based on the recording data of the CD encoder 113.
[0025]
  Therefore, with regard to the optical disk device configured as described above,Following recording interruption and resumption operationsWill be explained. When a recording operation on the optical disc 101 is performed, input data is sent from the host computer 117 to the CD encoder 113 via the interface circuit 116. The CD encoder 113 directly performs various processes such as error detection code and error correction code addition, EFM (Eight to Fourteen Modulation) processing, and synchronization signal addition on the input data based on the CD-ROM standard. This is sent to the laser control circuit 114. Then, the laser output of the optical pickup 103 is controlled to perform a recording operation on the optical disc 101.
[0026]
  Therefore, when the transfer rate of data used for recording from the host computer 117 is slower than the transfer rate of data used for writing from the CD encoder 113, the data stored in the buffer RAM 115 decreases. When the buffer underrun detection circuit 111 detects that the remaining amount of data is less than a predetermined amount and the buffer underrun is approaching, a recording interruption command is issued to the CD encoder 113, and the optical disc apparatus Record pause state.
[0027]
  When new data from the host computer 117 is accumulated in the buffer RAM 115 during the recording pause state, the buffer underrun detection circuit 111 determines that the buffer underrun state is avoided. The optical disc apparatus issues a recording restart command to the CD encoder 113 to cancel the recording pause state.
[0028]
  Therefore, the manner in which the recording is interrupted / resumed will be described in more detail. FIG. 2 is a timing chart of recording interruption / resumption of the optical disk apparatus of FIG. In FIG. 2, 201 is a pit formed on the optical disc 101 at the time of interruption / resumption. Reference numeral 202 denotes a write pulse when recording is interrupted, and 203 denotes a write pulse when recording is resumed. Reference numeral 204 denotes a link position that becomes a stop / restart joint at the end of the pit 201 when the stop is made. Reference numeral 205 denotes recording interruption timing, which is the end of the write pulse 202 when recording is interrupted to form continuous pits 201. Reference numeral 206 denotes a recording restart timing, and reference numeral 207 denotes a pit formation restart timing of the write pulse 203 when the recording is restarted.
[0029]
  Recording is suspended and resumed as follows. FIG. 3 is a flowchart for explaining interruption / resumption of recording. In FIG. 1 to FIG. 3, the recording interruption to the CD-R is performed at the link position 204 immediately after the formation of the continuous pits 201 is completed. For this purpose, first, when the remaining amount of data in the buffer RAM 115 falls below a certain value, the buffer underrun detection circuit 111 detects a state considered to be a buffer underrun (step 11).
[0030]
  Based on the detection result of the buffer underrun state, the recording interruption resumption circuit 108 detects the end position of the pit 201 in the write pulse 202 as the recording interruption timing 205 from the data string held by the CD encoder 113 (step 12). The optical disc apparatus issues a recording interruption command to the CD encoder 113 to enter a recording pause state (step 13). The write pulse 202 is interrupted at the position of the recording interruption timing 205, and the pit 201 forms the end and becomes the link position 204 (step 14). The address of the link position 204 is recorded in the time information memory 109. This is because the address information of the optical disc is directly converted into time information.
[0031]
  In the recording pause state, when new data is accumulated in the buffer RAM 115 from the host computer 117, the buffer underrun detection circuit 111 determines that the buffer underrun state has been avoided (step 15). The optical disk device issues a recording restart command to the CD encoder 113 to cancel the recording pause state. Then, the optical disc apparatus reads the address of the link position 204 that is the recording interruption position from the time information memory 109 and also reads new data from the buffer RAM 115. Then, the link position 204 already recorded on the optical disc 101 and the encoded data (data to be recorded) of the CD encoder 113 are synchronized (step 16).
[0032]
  Incidentally, the first data recorded immediately after the resumption of recording (after the recording resumption timing 206) is a space (a state without pits). That is, since the recording resumption timing 206 is immediately after the continuous pits 201 are formed, a space always appears at the beginning of the recording resumption timing 206. This first space is recorded as new data (that is, the write pulse 203 does not exist) (step 17). The output of the write pulse 203 is started at the subsequent pit formation resumption timing 207 (that is, the write pulse 203 becomes active), and the light power for forming the next pit 201 is irradiated from the optical pickup 103 (step 18).
[0033]
  In this way, according to the present invention, the link position 204 is arranged between the pit 201 and the space, in other words, a space is provided at a predetermined interval between the interruption and resumption of recording. A normal edge is formed in 201, and no discontinuity occurs in the recording interruption / resumption sequence. Therefore, according to the present invention, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that a read error due to a recording start position shift at the time of resuming recording cannot be corrected. .
[0034]
  (Reference example)
  FIG. 4 is a diagram for explaining the recording interruption resumption position, and shows a state in which the recording data is sequentially arranged in synchronization with the reference clock by the CD encoder 113 in FIG. In FIG. 4, 301 is recording data to be recorded on the optical disc 101. Reference numeral 302 denotes a frame, which is a recording data string composed of 588 channel bits. Since normally recorded data is composed of a plurality of frames 302, it is expressed as one frame 302 in order to represent the minimum unit.
[0035]
  A frame sync signal 303 is arranged at the head of one frame 302, and is used to synchronize recording data and a reference clock in the optical disc apparatus at the time of reading. Reference numeral 304 denotes recording data, similar to the recording data 301, and is recording data already recorded on the optical disc 101, particularly for the following description.
[0036]
  Reference numeral 305 denotes a recording interruption position, which represents a position where recording is interrupted due to the occurrence of a buffer underrun state, and corresponds to the link position 204 in FIG. Reference numeral 306 denotes a recording restart position, which represents a position at which recording is restarted when the buffer underrun state is resolved, and corresponds to the pit formation restart timing 207 in FIG. Reference numeral 307 denotes recording data similar to the recording data 301, and particularly recording data recorded on the optical disc 101 including the recording restart position deviation 308 after the recording restart for the following explanation.
[0037]
  Reference numeral 308 denotes a recording resumption position deviation, which represents a deviation between the recording interruption position 305 and the recording resumption position 306. As described above, the cause of the recording restart position deviation 308 is caused by a spindle motor control error, a reproduction signal jitter, and the like. Reference numeral 309 denotes re-recorded data recorded after the resumption of recording, and represents data recorded from the recording resumption position 306 to the first frame sync signal 310.
[0038]
  That is, the recording data 301 displayed in the upper part represents a state formed by performing ideal recording restart without deviation at the recording interruption position 305. Further, the recording data 301 displayed in the lower row represents a state where recording is performed including a recording restart position deviation 308 at the recording interruption position 305.
[0039]
  Regarding the frame configured as above,Optical disk deviceThe recording interruption and resumption operations will be described. FIG.Flowchart explaining recording interruption / resumptionIt is. 1, 4, and 5, the buffer underrun detection circuit 111 detects a buffer underrun state when the remaining amount of data in the buffer RAM 115 falls below a certain value, and the buffer underrun detection circuit 108 Inform the underrun state (step 21).
[0040]
  Based on the detection result of the buffer underrun state, the recording interruption / resumption circuit 108 counts channel bits from the frame sync signal 303 of the frame 302 to be interrupted from the data sequence controlled by the CD encoder 113 (step). 22). When the count result reaches a position within 4 bytes from the end in the frame 302, a recording interruption command is issued to the CD encoder 113 to enter a recording pause state (step 23).
[0041]
  According to the recording pause state, the time information memory 109 stores frame information at the time of recording interruption. The CD encoder 113 stops the output to the laser control circuit 114 according to the recording interruption command, and stops the recording on the optical disc 101 (step 24). A position at which this recording is interrupted is a recording interruption position 305. Unlike the end position of the pit 201 described in the previous example, in this example, the recording interruption position 305 may be a position within 4 bytes from the last in the frame 302 even in the middle of the continuous pit 201. .
[0042]
  Thereafter, in the recording pause state, recording data is transferred from the host computer 117 and new data is accumulated in the buffer RAM 115. When data exceeding a certain fixed value is accumulated in the buffer RAM 115, the buffer underrun detection circuit 111 detects that the buffer underrun state is avoided (step 25).
[0043]
  Based on the detection result of the buffer underrun detection circuit 111, the optical disc apparatus notifies the recording interruption resumption circuit 108 of the resumption of recording. The recording interruption resumption circuit 108 uses the servo circuit 107 to move the optical pickup 103 before the recording interruption position 305 on the optical disc 101 and traces the recording data 304 recorded on the optical disc 101 before the recording interruption ( Step 26).
[0044]
  At this time, the CD encoder 113 reads the stored data from the CIRC data memory 110 and encodes it. Then, the synchronization circuit 112 synchronizes the encoded data and the recorded data 304 that has been trace reproduced. When synchronization is established, the establishment of synchronization is notified to the recording interruption / resumption circuit 108 (step 27).
[0045]
  After synchronization is established, the recording interruption resumption circuit 108 obtains address information from the subcode data demodulated by the CD decoder 105 and the ATIP demodulated by the ATIP decoder 106 and starts the operation of the CD encoder 113. Then, the recording data 304 already recorded on the optical disc 101 and the encoded data (data to be recorded) of the CD encoder 113 are synchronized. The recording interruption resuming circuit 108 waits for the address information and frame information being traced to match the frame information at the time of recording interruption stored in the time information memory 109 (step 28).
[0046]
  When the frame information matches, the recording interruption resumption circuit 108 counts channel bits from the frame sync signal 303 of the frame 302 (step 29). When the counting result is a position within 4 bytes from the end in the frame 302 and coincides with the channel bit number indicating the recording restart position stored in the time information memory 109, the restart of recording is performed by the CD encoder 113. To tell. The position at which this recording is resumed is a recording resume position 306. When the CD encoder 113 is notified of the resumption of recording, the CD encoder 113 starts output to the laser control circuit 114 and starts recording on the optical disc 101 (step 30).
[0047]
  Next, a case where a recording resumption position shift 308 occurs between the recording interruption position 305 and the recording resumption position 306 will be described. When recording is resumed, the data already recorded on the optical disc 101 and the output from the CD encoder 113 are synchronized by the synchronization circuit 112, so that no theoretical error occurs. However, if the reproduction data shifts by 1 bit with respect to the reference clock due to an error or jitter in the rotation control of the spindle motor 102, a recording restart position shift 308 may occur in the data recorded on the optical disc 101.
[0048]
  Due to this recording restart position deviation 308,ReThe recording data 309 is read as error data. However, this read error can be corrected by error correction using the C1 code. This error correction will be described. FIG. 6 is a diagram for explaining the influence of CIRC even delay processing.
[0049]
  In FIG. 6, 401 is normal data that has been read normally, and a circle represents one byte of the reproduced normal data 401. Reference numeral 402 denotes error data that has not been normally read due to the recording restart position shift 308, and the meaning of the black circle represents one byte of the error data 402. Reference numeral 403 denotes combination data for combining data used for error correction by the C1 code, and reference numeral 404 denotes a data string in the same frame 302.
[0050]
  The combination data 403 straddles the data strings 404 of two adjacent frames 302 due to the influence of the even delay processing of CIRC. For this reason, the error data 402 due to the recording restart position deviation 308 is corrected by error correction using the C1 code of two adjacent data strings 404. That is, only two errors exist in the data string 404 of each frame 302 in the range of error correction by each C1 code (in the figure, error correction range group A and group B).
[0051]
  Since the error correction using the C1 code can correct up to two errors in one frame 302, it is possible to correct up to four errors in the data string 404 in the same frame 302. In other words, the recording resumption position shift 308 can be error-corrected within the range of 4 bytes from the end in one frame based on error correction by the C1 code based on the CD standard. However, since it is expressed within the range of 4 bytes based on the CD standard, when expressed based on other types of optical disk standards, it goes back to the maximum correctable number of the optical disk from the end of one frame. In other words. Therefore, the data position within the range that goes back from the end of one frame to the maximum correctable number of the optical disc can be determined as the recording interruption position 305.
[0052]
  As aboveThe recording interruption resuming circuit 108 sets the recording interruption position within the fourth byte from the end in one frame, that is, within the range that goes back from the end in one frame to the maximum correctable number of the optical disc, By restarting recording while maintaining continuity with already recorded data, even if a read error occurs due to a recording start position deviation (recording resume position deviation) 308 at the time of resuming recording, for example, CIRC The error correction is possible with the C1 code, and the possibility of being uncorrectable even when an error occurs in another part can be greatly reduced. Therefore, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that it becomes impossible to correct a read error associated with recording interruption / resumption.
[0053]
  (Embodiment 2)
  next,According to the present inventionThe operation for interrupting and resuming recording on the optical disc 101 of the optical disc apparatus will be described. FIG.Flowchart explaining recording interruption / resumptionIt is. In FIG. 1, FIG. 2, FIG. 4, and FIG. This is performed at the link position immediately after the formation of the pit 201 is completed.
[0054]
  First, when the remaining amount of data in the buffer RAM 115 falls below a certain value, the buffer underrun detection circuit 111 detects a buffer underrun state and informs the recording interruption resumption circuit 108 that the buffer underrun state is present ( Step 41). Based on the detection result of the buffer underrun state, the recording interruption resuming circuit 108 detects the end position of the pit 201 in the write pulse 202 as the recording interruption timing 205 from the data string held by the CD encoder 113. At the same time, the recording interruption resuming circuit 108 counts channel bits from the frame sync signal 303 of the frame 302 to be interrupted from the data sequence held by the CD encoder 113 (step 42).
[0055]
  When it is detected from the count result that the recording interruption timing 205 is within a position within 4 bytes from the end in the frame 302, a recording interruption instruction is issued to the CD encoder 113 to enter a recording pause state (step 43). The write pulse 202 is interrupted at the position of the recording interruption timing 205, and the pit 201 forms the end and becomes the link position 204 (step 44). The address of the link position 204 is recorded in the time information memory 109.
[0056]
  When the recording data is transferred from the host computer 117 and new data is accumulated in the buffer RAM 115 in the recording pause state, the buffer underrun detection circuit 111 detects that the buffer underrun state is avoided (step 45). The optical disk device issues a recording restart command to the CD encoder 113 to cancel the recording pause state. Then, the optical disk apparatus reads the address of the link position 204, which is the recording interruption position, from the time information memory 109 and reads new data from the buffer RAM 115 (step 46).
[0057]
  The optical disc apparatus notifies the resumption of recording to the recording interruption resumption circuit 108 based on the detection result of avoidance by the buffer underrun detection circuit 111. The recording interruption resumption circuit 108 uses the servo circuit 107 to move the optical pickup 103 before the position of the recording interruption timing 205 on the optical disk 101 (recording interruption position 305 in the example of FIG. 4), and before the recording interruption, The recorded data 304 recorded in 101 is traced (step 47).
[0058]
  At this time, the synchronization circuit 112 synchronizes the recording data stored in the CIRC data memory 110 before the recording interruption and the reference clock in the optical disk apparatus with respect to the recording data 304 that has been trace-reproduced. When synchronization is established, the establishment of synchronization is notified to the recording interruption / resumption circuit 108 (step 48).
[0059]
  After synchronization is established, the recording interruption resumption circuit 108 obtains address information from the subcode data demodulated by the CD decoder 105 and the ATIP demodulated by the ATIP decoder 106 and starts the operation of the CD encoder 113. Then, the recording data 304 already recorded on the optical disc 101 and the encoded data (data to be recorded) of the CD encoder 113 are synchronized. The recording interruption resuming circuit 108 waits for the address information and frame information being traced to match the frame information at the time of recording interruption stored in the time information memory 109 (step 49). When the frame information matches, the recording interruption resumption circuit 108 counts channel bits from the frame sync signal 303 of the frame 302 (step 50).
[0060]
  When the count result reaches a position within 4 bytes from the end in the frame 302, the CD encoder 113 is notified of resumption of recording. The position at which this recording is resumed is the recording resume timing 206 (recording resume position 306 in FIG. 4). When the CD encoder 113 is notified of the resumption of recording, the CD encoder 113 starts output to the laser control circuit 114 and recording on the optical disc 101 is started. By the way, the first data recorded immediately after resuming recording (after the recording resuming position 306) is a space (no pit). That is, since the recording restart position 306 is immediately after the continuous pits 201 are formed, a space always appears at the beginning after the recording restart position 306. Therefore, this first space is recorded as new data (that is, the write pulse 203 is inactive) (step 51).
[0061]
  The output of the write pulse 203 is started at the subsequent pit formation restart timing 207 (that is, the write pulse 203 is active), and the optical power is applied from the optical pickup 103 to form the next pit 201 (step 52).
[0062]
  The above explanation relies on error correction by the C1 code based on the CD standard, and describes the position of the recording interruption timing 205 (similarly, the recording resumption timing 206) within the range of 4 bytes from the end in one frame. did. However, similar to the description in the above-described invention, it is expressed as being within the range of 4 bytes based on the CD standard. Therefore, if the expression is based on another type of optical disk standard, the optical disk from the end in one frame is displayed. In other words, it can be rephrased as a range that goes back up to the maximum correctable number. Therefore, the data position within the range that goes back from the end of one frame to the maximum correctable number of the optical disc can be determined as the position of the recording interruption timing 205 (similarly, the recording resumption timing 206).
[0063]
  As described above, according to the present invention, the recording interruption resumption circuit 108 sets the recording interruption position within the fourth byte from the last in one frame, that is, from the last in one frame to the maximum correctable number of the optical disc. Since the recording is resumed while keeping the continuity with the data already recorded, and the link position where the recording is interrupted is arranged between the pit 201 and the space, A normal edge is formed in one pit 201, and there is no occurrence of a discontinuous point of recording interruption / resumption.
[0064]
  Thus, even if a read error due to a recording start position deviation (recording resume position deviation) 308 at the time of resuming recording occurs, error correction can be performed using, for example, the CIRC C1 code. Discontinuous points do not occur in the operation. Therefore, it is possible to greatly reduce the possibility that error correction becomes impossible due to recording interruption / resumption. Further, the present invention is not limited to buffer underrun, and can be generally used when recording is interrupted and resumed, as described above. Therefore, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that it becomes impossible to correct a read error associated with recording interruption / resumption.
[0065]
  (Embodiment 3)
  Next, particularly about an example in which the optical disc 101 is a CD-RW based on the CD standard,According to the present inventionThe recording interruption and resuming operations of the optical disc apparatus will be described. FIG. 8 is a block diagram for explaining another optical disk apparatus of the present invention. Compared to the block diagram of FIG. 1, this corresponds to the case where the optical disc 151 is a CD-RW. Accordingly, the optical pickup 153 has a function of irradiating not only the recording laser power but also the erasing laser power for rewriting. By irradiating the optical disc (that is, CD-RW) 151 with erasing laser power, the optical disc 151 is initialized.
[0066]
  Further, the laser control circuit 164 has a function of controlling the recording operation and the erasing operation of the optical pickup 153. Further, the CD encoder 163 has a function of configuring an erasing timing and a data array in addition to a function of configuring a recording timing and a data array. Since the other block components are the same as those described in the block diagram of FIG. 1 at the beginning, the same reference numerals are given, and repeated description is omitted.
[0067]
  When the optical disk is a CD-RW, the optical disk apparatus of the present invention performs the recording interruption / resumption operation described below. That is, when the recording is interrupted, the optical disc apparatus of the present invention detects the end of the pit when the recording interruption is resumed by the recording interruption resumption circuit 108. At the same time, the end position of this pit is recorded in the time information memory 109. Then, by irradiating the erasing laser power from the optical pickup 153, the position immediately after the end position of the pit is initialized and the recording is interrupted.
[0068]
  According to the CD standard, when 1 byte of recording data is EFM converted to 14 clock data (this is expressed as 14T), the pit length (or space) is within the range of 3T to 11T. Convert to Therefore, in this initialization range, a complete space period is created by securing a length to be initialized after the recording interruption is “11T” or more.
[0069]
  When resuming the recording, the laser light source of the optical pickup 153 is activated during the period in which the space appearing immediately after the resumption of recording is recorded after the recording resumption timing, and the recording laser power is irradiated at the timing at which pits should be formed. Then, pit formation is resumed. Therefore, this space period is formed in advance by initializing a period of “11T” or more immediately after detecting the end of the pit to be interrupted when recording is interrupted. By writing the next pit by irradiating the laser power, a complete space period is created.
[0070]
  The optical disk apparatus of the present invention initializes the “11T” width or more obtained by EFM conversion of recorded data. This is the same as the longest pit length (or in the case of optical disks having other frame configurations). A predetermined width (period) of (space length) may be initialized. Furthermore, the above description has been made based on the CD standard optical disc, but in the case of other optical disc standards as well, the maximum pit (or space) in the optical disc standard immediately after the pit end position is the same. The length should be initialized.
[0071]
  Explained aboveAccording to the present inventionThe description will be given in more detail with reference to the drawings of the recording interruption and resuming operations of the optical disc apparatus. FIG. 9 is a timing chart of recording interruption / resumption when the optical disc is a CD-RW, and FIG. 10 is a flowchart for explaining recording interruption / resumption of FIG.
[0072]
  In FIG. 9, 501 is a pit formed at the time of interruption / resumption. Reference numeral 502 denotes a write pulse when recording is interrupted, and reference numeral 503 denotes a write pulse when recording is resumed. Reference numeral 504 denotes a link position, which becomes a stop / restart joint at the end of the pit 501 at the time of interruption.
[0073]
  In starting the recording interruption operation, reference numeral 505 denotes an end timing, which is an end timing of pit formation at the end of the write pulse 502 when recording of the continuous pit 501 is interrupted. Reference numeral 506 denotes a recording interruption timing, and an erasing laser power is applied to erase a width equal to or greater than the “11T” width pit length obtained by EFM conversion of the recording data from the link position 504 (that is, the end timing 505). Represents later timing.
[0074]
  In starting the recording resumption operation, reference numeral 507 denotes a recording resumption timing. Reference numeral 508 denotes a start timing for causing laser emission. Reference numeral 509 denotes a pit formation restart timing of the write pulse 503 when recording is restarted.
[0075]
  In FIG. 8, FIG. 9, and FIG. 10, the recording interruption to the CD-RW is performed at the link position 504 after the formation of the continuous pit 501 is completed. For this purpose, first, when the remaining amount of data in the buffer RAM 115 falls below a certain value, the buffer underrun detection circuit 111 detects a state considered to be a buffer underrun (step 61).
[0076]
  Based on the detection result of the buffer underrun state, the recording interruption resumption circuit 108 uses the end position of the pit 501 in the write pulse 502, that is, the link position 504, as the pit formation end timing 505 from the data sequence controlled by the CD encoder 163. To detect. The optical disk apparatus issues a recording interruption command to the CD encoder 163 to enter a recording pause state. At the same time, the address of the link position 504 is recorded in the time information memory 109 (step 62). This is because the address information of the optical disk 151 is directly converted into time information.
[0077]
  Also, the optical disk deviceFinishedAn area on the recording track of “11T” width pits or more obtained by EFM conversion of data from timing 505 is irradiated with erasing laser power to erase previously written data (pits). In this way, the track after the link position 504 is initialized by “11T” width pits or more, the irradiation of the erasing laser power is stopped at the position of the recording interruption timing 506, and the recording is interrupted (step 63).
[0078]
  When new data from the host computer 117 is accumulated in the buffer RAM 115 during the recording pause state, the buffer underrun detection circuit 111 determines that the buffer underrun state has been avoided (step 64). The optical disc apparatus issues a recording restart command to the CD encoder 163 to cancel the recording pause state. The optical disk apparatus reads the address of the link position 504 from the time information memory 109 and reads new data from the buffer RAM 115. Then, the link position 504 already recorded on the optical disk 151 and the encoded data (data to be recorded) of the CD encoder 163 are synchronized (step 65).
[0079]
  Incidentally, the first data recorded immediately after the resumption of recording (after the recording resumption timing 507) is a space (no pit). That is, since the recording restart timing 507 is immediately after the continuous pits 501 are formed, a space always appears in the recording restart timing 507. Therefore, this first space is recorded as new recording data. That is, the light pulse 503 does not exist, and the laser light source activation timing 508 is reached (step 66).
[0080]
  Thereafter, irradiation of the write pulse 503 with the recording laser power is started from the pit formation restart timing 509. Thus, since the write pulse 503 for forming the next pit 501 is emitted from the pit formation restart timing 509, a complete space period is formed between the pit 501 before the recording interruption and the pit 501 after the recording restart. (Step 67).
[0081]
  Thus, according to the optical disk apparatus of the present invention, the erasing laser power having a width equal to or larger than the pit length of “11T” width obtained by EFM conversion of the recording data after the end timing 505 at the link position 504 in advance. Irradiate to erase. Therefore, after the end timing 505, data (pits) written in the past are erased, and the disk track (recording area) is initialized.
[0082]
  This eliminates the need to control the highly accurate irradiation timing as the laser activation timing 508 when resuming recording. When resuming recording, writing is started at a pit formation resuming timing 509 for recording a pit 501 to be formed next, using a previously formed space (state without pits).
[0083]
  As described above, in the CD-RW optical disc apparatus according to the present invention, the link position 504 is set between the pit 501 and the space, and the range longer than the longest pit length (space length) when recording is interrupted in advance of the resumption of recording. Since initialization is performed, the end of the pit 501 is a complete pit edge. In addition, the laser may be activated during the space period until the next pit 501 is formed, and the write pulse 503 may be activated at the pit formation resumption timing 509. It does not occur. Further, when recording is resumed, it is not necessary to control the irradiation timing with high accuracy as the laser activation timing 508.
[0084]
  As described above, according to the present invention, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that a read error due to a recording start position shift at the time of resuming recording cannot be corrected. Can do.
[0085]
【The invention's effect】
  As described above, according to the present invention, since a space is provided at a predetermined interval between recording interruption and resumption, normal edges are formed in the two front and rear pits, and this is not possible in the recording interruption / resumption sequence. There will be no continuous points. Therefore, according to the present invention, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that a read error due to a recording start position shift at the time of resuming recording cannot be corrected. .
[0086]
  Furthermore, according to the present invention, the link position where the recording is interrupted is arranged between the pit and the space within the range that goes back from the end of one frame to the maximum correctable number of the optical disk. A normal edge is formed in the two front and rear pits, and there is no occurrence of a discontinuous point of recording interruption / resumption. In this way, even if a read error due to a recording start position shift at the time of resuming recording occurs, error correction is possible, and discontinuous points do not occur in a series of operations of recording interruption and resumption. Therefore, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that it becomes impossible to correct a read error associated with recording interruption / resumption.
[0087]
  Furthermore, according to the present invention, since the link position is set between the pit and the space and the range longer than the longest pit length (space length) is initialized in advance when recording is interrupted, the end of the pit becomes a complete pit edge. . In addition, it is only necessary to activate the laser during the space period until the next pit is formed and activate the write pulse at the pit formation resumption timing, so discontinuity occurs when resuming recording from recording interruption. Nothing will happen. Further, when recording is resumed, it is not necessary to control the irradiation timing with high accuracy as the laser activation timing. In this way, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that correction of a read error associated with recording interruption / resumption becomes impossible. In this way, it is possible to provide an optical disc apparatus and an optical disc recording method that can greatly reduce the possibility that correction of a read error due to a recording start position shift at the time of resuming recording becomes impossible.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an optical disc apparatus according to the present invention.
FIG. 2 is a timing chart of recording interruption / resumption of the optical disc apparatus of FIG.
FIG. 3 is a flowchart illustrating recording interruption / resumption.
FIG. 4 is a diagram for explaining a recording interruption restart position.
[Figure 5]Flowchart explaining recording interruption / resumption
FIG. 6 is a diagram for explaining the effect of CIRC even delay processing;
[Fig. 7]Flowchart explaining recording interruption / resumption
FIG. 8 is a block diagram illustrating another optical disc apparatus of the present invention.
FIG. 9 is a timing chart of recording interruption / resumption when the optical disc is a CD-RW.
FIG. 10 is a flowchart for explaining recording interruption / resumption in FIG. 9;
[Explanation of symbols]
  101, 151 optical disc
  102 Spindle motor
  103, 153 Optical pickup
  104 RF amplifier
  105 CD decoder
  106 ATIP decoder
  107 Servo circuit
  108 Recording interruption resumption circuit
  109 Time information memory
  110 CIRC data memory
  111 Buffer underrun detection circuit
  112 Synchronous circuit
  113, 163 CD encoder
  114, 164 laser control circuit
  115 Buffer RAM
  116 Interface circuit
  117 Host computer
  201, 501 pits
  202, 203, 502, 503 Write pulse
  204, 504 Link position
  205 Recording interruption timing
  206 Recording restart timing
  207 Pit formation restart timing
  301, 304, 307 Recorded data
  302 frames
  303, 310 Frame sync signal
  305 Recording interruption position
  306 Recording resume position
  308 Recording restart position deviation
  309 Re-recorded data
  401 Normal data
  402 Error data
  403 combination data
  404 data columns
  505 End timing
  506 Recording interruption timing
  507 Recording restart timing
  508 Start timing
  509 Pit formation restart timing

Claims (15)

An optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotating the optical disc, and irradiating the optical disc with laser light to reproduce recorded information from the optical disc or record information on the optical disc Optical pickup, laser control means for controlling the optical power of the irradiated laser light, demodulating means for binarizing and demodulating the reproduced signal, and ATIP demodulating means for extracting the wobble signal from the reproduced signal and demodulating the ATIP An optical disc apparatus capable of recording information on the optical disc,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting in synchronization with
Resuming recording by providing a predetermined interval between information already recorded on the optical disc and information to be resumed,
The optical disk apparatus according to claim 1, wherein the predetermined interval is a space that appears at the beginning when recording is resumed. An optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotating the optical disc, and irradiating the optical disc with laser light to reproduce recorded information from the optical disc or record information on the optical disc Optical pickup, laser control means for controlling the optical power of the irradiated laser light, demodulating means for binarizing and demodulating the reproduced signal, and ATIP demodulating means for extracting the wobble signal from the reproduced signal and demodulating the ATIP An optical disc apparatus capable of recording information on the optical disc,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting in synchronization with
Resuming recording by providing a predetermined interval between information already recorded on the optical disc and information to be resumed,
The predetermined interval is a space that goes back from the end of one frame to the maximum correctable number of the optical disk and that appears at the beginning when recording is resumed. Optical disk device. An optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotating the optical disc, and irradiating the optical disc with laser light to reproduce recorded information from the optical disc or record information on the optical disc Optical pickup, laser control means for controlling the optical power of the irradiated laser light, demodulating means for binarizing and demodulating the reproduced signal, and ATIP demodulating means for extracting the wobble signal from the reproduced signal and demodulating the ATIP An optical disc apparatus capable of recording information on the optical disc,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting in synchronization with
Resuming recording by providing a predetermined interval between information already recorded on the optical disc and information to be resumed,
The optical disk apparatus according to claim 1, wherein the optical disk is a rewritable disk, and the predetermined interval is a space that appears at the beginning when recording is resumed in the initialization area after the recording is interrupted. An optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotating the optical disc, and irradiating the optical disc with laser light to reproduce recorded information from the optical disc or record information on the optical disc Optical pickup, laser control means for controlling the optical power of the irradiated laser light, demodulating means for binarizing and demodulating the reproduced signal, and ATIP demodulating means for extracting the wobble signal from the reproduced signal and demodulating the ATIP An optical disc apparatus capable of recording information on the optical disc,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting in synchronization with
When the buffer underrun detecting means determines that the buffer underrun state is detected and the recording interruption resuming means detects a recording interruption position, the recording is interrupted, and the buffer underrun detecting means avoids the buffer underrun state. An optical disc apparatus characterized by resuming recording by providing a predetermined interval between information already recorded on the optical disc and information to be resumed when judged. 5. The optical disk apparatus according to claim 4, wherein the recording interruption position is a pit end position, and the predetermined interval is a space appearing at the beginning when recording is resumed. The recording interruption position is within a range that goes back from the end of one frame to the maximum correctable number of the optical disk, and the recording resumption position is recorded with the recording data that has already been recorded on the optical disk. 5. The optical disk apparatus according to claim 4, wherein the data is synchronized with data to be recorded, and the predetermined interval is a space that appears at the beginning when recording is resumed. The optical disc is a rewritable disc, and the optical pickup has a function of irradiating a recording laser power and an erasing laser power, and a laser control means controls a recording operation and an erasing operation of the optical pickup. The modulation means has a function of modulating and outputting the information to be recorded in synchronization with a predetermined clock signal, and modulating the data corresponding to the length of the portion to be erased in synchronization with the predetermined clock signal. Output function,
The recording interruption position is a pit end position, and after the recording is interrupted, the maximum pit length according to the optical disc standard is initialized immediately after the pit end position, and the recording is resumed in the initialized area for the predetermined interval. 5. The optical disk apparatus according to claim 4, wherein the space appears at the beginning of the time. An optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotating the optical disc, and irradiating the optical disc with laser light to reproduce recorded information from the optical disc or record information on the optical disc Optical pickup, laser control means for controlling the optical power of the irradiated laser light, demodulating means for binarizing and demodulating the reproduced signal, and ATIP demodulating means for extracting the wobble signal from the reproduced signal and demodulating the ATIP An optical disc apparatus capable of recording information on the optical disc,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting in synchronization with
When the buffer underrun detection means determines the buffer underrun state and the recording interruption resumption means detects a recording interruption position, the recording interruption is performed at the pit end position,
When it is determined that the buffer underrun detection means has avoided the buffer underrun state, the information already recorded on the optical disc is synchronized with the information to be recorded, and the recording is resumed. An optical disk apparatus, wherein recording is resumed from a space appearing at the beginning. An optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotating the optical disc, and irradiating the optical disc with laser light to reproduce recorded information from the optical disc or record information on the optical disc Optical pickup, laser control means for controlling the optical power of the irradiated laser light, demodulating means for binarizing and demodulating the reproduced signal, and ATIP demodulating means for extracting the wobble signal from the reproduced signal and demodulating the ATIP An optical disc apparatus capable of recording information on the optical disc,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting in synchronization with
When the buffer underrun detecting means determines that the buffer underrun state is detected and the recording interruption resuming means detects a recording interruption position, a range that goes back to the maximum correctable number of the optical disk from the end of one frame. Interrupted recording within
When the buffer underrun detection means determines that the buffer underrun state has been avoided, the information already recorded on the optical disc is synchronized with the information to be recorded again, and the channel bit count result is An optical disc apparatus, wherein recording is resumed from a space that is located at a position retroactive to the maximum correctable number of the optical disc from the end in one frame and appears at the beginning when recording is resumed. 10. The optical disk is a CD-R disk, and the position traced back to the maximum correctable number of the optical disk from the end of one frame is a position within 4 bytes. Optical disk device. A rewritable optical disc that can be recorded by laser light of a predetermined optical power, a rotation driving means for rotationally driving the optical disc, and reproducing recorded information from the optical disc by irradiating the optical disc with laser light, or information on the optical disc An optical pickup for recording or erasing the laser, laser control means for controlling the optical power of the laser light to be irradiated to control the recording operation and the erasing operation of the optical pickup, and demodulation for binarizing and demodulating the reproduced signal An optical disc apparatus capable of recording information on the optical disc, and an ATIP demodulator for demodulating ATIP by extracting a wobble signal from a reproduced signal,
A buffer underrun detecting means for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount falls below a predetermined data amount, a recording interruption resuming means for performing recording on the optical disc at a desired position, and a recording interruption Time information storage means for storing the last time or address information, synchronization means for synchronizing information already recorded on the optical disc with a predetermined clock signal, and information to be recorded on the predetermined clock signal Modulation means for modulating and outputting data corresponding to the length of the portion to be modulated or erased in synchronization with a predetermined clock signal,
When the buffer underrun detecting unit determines that the buffer underrun state is detected and the recording interruption resuming unit detects a recording interruption position, the recording is interrupted at the pit end position, and after the recording is interrupted, immediately after the pit end position. Initialize the maximum pit length on the optical disc standard from
When the buffer underrun detecting means determines that the buffer underrun state has been avoided, the information already recorded on the optical disc is synchronized with the information to be recorded again in the initialized area. An optical disc apparatus, wherein recording is resumed from a space appearing at the beginning when recording is resumed. 12. The optical disc apparatus according to claim 11, wherein the optical disc is a CD-RW disc, and the maximum pit length in the optical disc standard is not less than an 11T-wide pit length obtained by EFM conversion. An optical pickup that irradiates an optical disc with laser light to reproduce recorded information from the optical disc or records information on the optical disc, laser control means for controlling the optical power of the irradiated laser beam, and binarizes the reproduced signal for demodulation Demodulating means, ATIP demodulating means for demodulating ATIP by extracting a wobble signal from the reproduced signal, recording interruption resuming means for recording on the optical disk at a desired position, and the last time or address at which recording was interrupted and time information storage means for storing information, and synchronization means for synchronizing the information already recorded on the optical disk with a predetermined clock signal, modulates the information to be recorded in synchronism with a predetermined clock signal for modulating outputs An optical disc recording method for an optical disc apparatus comprising:
A buffer underrun detection step for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount is less than or equal to a predetermined data amount; a recording interruption position detecting step for detecting the recording interruption position by the recording interruption resumption means; A recording interruption step in which the optical pickup interrupts recording at the end position of the pit, and a buffer underrun avoidance step in which the amount of data to be recorded is monitored and a buffer underrun condition is determined to be avoided when a predetermined amount of data is exceeded A synchronization step for synchronizing information to be resumed with information already recorded on the optical disc by the synchronization means, a space recording resumption step for resuming recording from a space, and a predetermined space recording resumption step. Pit recording resumes after pit formation is resumed Optical disc recording method characterized by having a step. An optical pickup that irradiates an optical disc with laser light to reproduce recorded information from the optical disc or records information on the optical disc, laser control means for controlling the optical power of the irradiated laser beam, and binarizes the reproduced signal for demodulation Demodulating means, ATIP demodulating means for demodulating ATIP by extracting a wobble signal from the reproduced signal, recording interruption resuming means for recording on the optical disk at a desired position, and the last time or address at which recording was interrupted and time information storage means for storing information, and synchronization means for synchronizing the information already recorded on the optical disk with a predetermined clock signal, modulates the information to be recorded in synchronism with a predetermined clock signal for modulating outputs An optical disc recording method for an optical disc apparatus comprising:
A buffer underrun detection step for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount is less than or equal to a predetermined data amount; a recording interruption position detecting step for detecting the recording interruption position by the recording interruption resumption means; A recording interruption step in which the optical pickup interrupts recording at a position that is the end position of the pit and is in a range that goes back from the end of one frame to the maximum correctable number of the optical disk, and data to be recorded A buffer underrun avoidance step that determines that a buffer underrun condition has been avoided if the amount exceeds a predetermined amount of data, and attempts to resume recording on information that has already been recorded on the optical disc by the synchronization means Synchronization step to synchronize information and channel bit count result in one frame Recording of pit formation after providing a space recording restarting step in which recording is restarted from a space at a position within a range retroactive to the maximum correctable number of the optical disc from the end, and a predetermined space recording restarting step And a pit recording resuming step for resuming the recording. An optical pickup that irradiates an optical disc with laser light to reproduce recorded information from the optical disc or records information on the optical disc, laser control means for controlling the optical power of the irradiated laser beam, and binarizes the reproduced signal for demodulation Demodulating means, ATIP demodulating means for demodulating ATIP by extracting a wobble signal from the reproduced signal, recording interruption resuming means for recording on the optical disk at a desired position, and the last time or address at which recording was interrupted and time information storage means for storing information, and synchronization means for synchronizing the information already recorded on the optical disk with a predetermined clock signal, the information to be recorded in synchronism with a predetermined clock signal by modulating output or Modulation means for modulating and outputting data corresponding to the length of the portion to be erased in synchronization with a predetermined clock signal. The optical disc recording method that an optical disk apparatus,
A buffer underrun detection step for monitoring a data amount to be recorded and determining a buffer underrun state when the data amount is less than or equal to a predetermined data amount; a recording interruption position detecting step for detecting the recording interruption position by the recording interruption resumption means; A time information storing step for storing information of the last time or address at which recording was interrupted, a recording interrupting step in which the optical pickup interrupts recording at a pit end position, and immediately after the pit end position after the recording interrupt step An initialization step for initializing the maximum pit length on the optical disc standard, a buffer underrun avoidance step for monitoring a data amount to be recorded and determining that a buffer underrun condition is avoided when a predetermined data amount is exceeded, On the optical disc, the synchronization means A synchronization step for synchronizing information to be resumed with the recorded information, a space recording resumption step for resuming recording from a space in the area formed by the initialization step, and a predetermined space recording resumption step are provided. An optical disc recording method comprising: a pit recording restarting step for restarting recording of pit formation later.

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