JP3806955B2 - Data reproducing apparatus and data recording method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a data reproducing apparatus and a data recording method for recording / reproducing data on / from an optical disc recording medium.
[0002]
[Background Art and Problems to be Solved by the Invention]
Write-once optical disks that can write data only once, magneto-optical disks that can write data as many times as possible (optical disks) are actively used as recording media for image processing or computers.
An optical disk device for recording / reproducing data on such an optical disk normally treats the entire recording area of the optical disk as one recording area, irradiates the laser beam, and reflects the reflected laser beam. Has only one set of optical systems.
[0003]
However, when the entire recording area of the optical disc is handled as one recording area, the seek time for moving the optical system to the position where the target data is recorded becomes large.
In addition, when data is read from an optical disc using only one set of optical systems, the data rate of the readable data is limited.
[0004]
In order to solve these problems, it is conceivable to divide the recording area of the optical disc in the radial direction, and to record / reproduce data using a plurality of optical systems corresponding to the respective recording areas.
In such a case, it is necessary to record / reproduce data for each of the plurality of recording areas using clock signals having different frequencies.
However, if data is recorded using a clock signal that is not synchronized with each other for each of the plurality of recording areas, the synchronization of the positions of the data recorded in each of the plurality of recording areas becomes uneven. The timing for reading the data recorded from each cannot be synchronized, and the error correction processing for the data recorded from each of the plurality of recording areas becomes complicated.
[0005]
The present invention has been made in view of the above-described problems of the prior art, and the seek time for the optical disc can be shortened as compared with the case where the entire recording area of the optical disc is handled as one recording area. An object is to provide a data reproducing apparatus.
It is another object of the present invention to provide a data reproducing apparatus that can read data from an optical disc at a higher data rate than when only one set of optical systems is used.
[0006]
In addition, the present invention records data using a synchronized clock signal with different frequencies for each of a plurality of recording areas of an optical disc, and aligns the recording positions between the plurality of recording areas. It is an object of the present invention to provide a data recording method and a data reproducing apparatus capable of recording data and reading data from each of a plurality of recording areas at a synchronized timing.
The present invention also provides a data reproducing apparatus and a data recording method that do not complicate error correction processing and the like even when data is reproduced using a plurality of recording areas of an optical disc with a plurality of clock signals. The purpose is to do.
[0007]
[Means for Solving the Problems]
  A data recording apparatus according to the present invention is an apparatus for recording data on an optical disc recording medium having a plurality of recording areas divided in the radial direction, corresponding to each of the plurality of recording areas, and mutuallyPhaseMeans for generating a plurality of recording clock signals to be synchronized, and recording data to be recorded in each of the plurality of recording areas;NotationMeans for converting each of a plurality of predetermined recording signals in synchronization with the recording clock signal;The recording positions in the circumferential direction of the recording data in the plurality of recording areas correspond to each of the plurality of recording signals so as to be relatively aligned with positions where data can be read out at a timing synchronized with each recording area at the time of reading. Means for simultaneously recording each of the plurality of recording signals in parallel in each of the plurality of recording areas in synchronization with a recording clock signal;Have
[0008]
  Preferably, the means for generating the plurality of recording clock signals has a clock for recording recording data in one recording area of the plurality of recording areas, and recording data in the other recording area. Create from a clock to record.
[0009]
  A data recording method according to the present invention is a method for recording data on an optical disc recording medium having a plurality of recording areas divided in the radial direction, corresponding to each of the plurality of recording areas, and mutuallyPhaseA plurality of recording clock signals to be synchronized are generated, and recording data to be recorded in each of the plurality of recording areas isNotationConverted to each of a plurality of predetermined recording signals in synchronization with the recording clock signal,The recording positions in the circumferential direction of the recording data in the plurality of recording areas correspond to each of the plurality of recording signals so as to be relatively aligned with positions where data can be read out at a timing synchronized with each recording area at the time of reading. Synchronously with the recording clock signal, the plurality of recording signals are simultaneously recorded in parallel in each of the plurality of recording areas..
[0010]
  Preferably, when generating the plurality of recording clock signals, a clock for recording recording data in one of the plurality of recording areas is used as a recording data for the other recording area. Create from a clock to record.
[0011]
  In the data recording apparatus and the data recording method according to the present invention, the one recording area may be an inner recording area, and the other recording area may be an outer recording area..
[0012]
  The optical disc recording medium according to the present invention has a plurality of recording areas divided in the radial direction, and the recording data recorded in each of the plurality of recording areas corresponds to each of the plurality of recording areas. MutuallyPhaseIt is converted into each of a plurality of predetermined recording signals in synchronization with a plurality of recording clock signals to be synchronized,The recording positions in the circumferential direction of the recording data in the plurality of recording areas are synchronized with the plurality of recording clock signals so that they are relatively aligned with the positions where the data can be read out at the timing synchronized with each recording area at the time of reading. And each of the plurality of recording areasEach of the plurality of recording signals is recorded.
[0016]
  Thus, the data recording method according to the present inventionAnd data recording apparatusIn, recording signals are recorded in each of the plurality of recording areas using recording clock signals that are synchronized with each other, so that the recording positions of the recording data in each recording area are aligned.
  Therefore, the data recording method according to the present inventionAnd data recording apparatusByLightRecorded on multiple recording areas of the discRecordedWhen the recorded data is reproduced, the recording data is read out at the same timing, and the buffering and decoding processing of the recording data obtained from each of the plurality of recording areas can be performed at the same timing.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
First embodiment
Hereinafter, a first embodiment of the present invention will be described.
FIG. 1 is a diagram showing a configuration of an optical disk device 4 according to the present invention.
[0018]
As shown in FIG. 1, an optical disk device 4 that implements a data reproducing apparatus and a data recording method according to the present invention includes a SCSI controller 18, an outer peripheral data reproducing apparatus 10, and an outer peripheral data reproducing apparatus 10.₁, 10₂, Data output circuit 20, outer periphery and inner periphery RF circuit 404₁404₂The optical head fixing portion 42 for the outer periphery and the inner periphery₁, 42₂, Inner and outer head movable portions 44₁44₂The spindle motor 450 rotates the magneto-optical disk 2 according to the control of the disk servo circuit 458, the tracking servo circuit 452, the focus servo circuit 454, the radial servo circuit 456, and the disk servo circuit 458. However, in FIG. 1, for the sake of simplification, the data reproducing apparatus 10₁, 10₂And the data output circuit 20, the optical head fixing part 42.₁, 42₂And the head movable part 44.₁44₂Is shown as one component.
[0019]
Optical head fixing part 42₁, 42₂Respectively, a preamplifier 420 for amplifying an RF signal input from a photodiode (PD) 422, a photodiode 422 for detecting a laser beam reflected from the magneto-optical disk 2 and converting it into an electrical RF signal, and an HF superimposing circuit. Reference numeral 424 denotes a laser diode (LD) 426 that generates a laser beam used for recording / reproducing recorded data, and an optical system 428.
[0020]
Head movable part 44₁44₂Respectively, according to the control of the radial servo circuit 456, the head movable portion 44.₁44₂The optical head fixing unit 42 is controlled in accordance with the control of the linear motor 440 that changes the position of the tracking servo circuit 452 and the tracking servo circuit 454.₁, 42₂It is comprised from the optical system 442 which adjusts the focus of the laser beam input from.
[0021]
The optical disk device 4 has a magneto-optical disk 2 in which the recording area is divided into two areas (an outer recording area 202 and an inner recording area 204 (FIGS. 2 and 3)) in the radial direction by these components. On the other hand, audio / video data and computer data (hereinafter, data recorded / reproduced with respect to the magneto-optical disk 2 is referred to as “recorded data”) are recorded and reproduced.
[0022]
In the optical disc device 4, the system control circuit 408 controls the operation of each component of the optical disc device 4. Further, the system control circuit 408 outputs the recording data input from the SCSI controller 18 to the laser power control circuit 406.
The tracking servo circuit 452, the focus servo circuit 454, the radial servo circuit 456, and the disk servo circuit 458 are respectively controlled by the head movable unit 44 according to the control of the system control circuit 408.₁44₂Optical system 442 and head movable portion 44.₁44₂The operations of the linear motor 440 and the spindle motor 450 are controlled.
[0023]
The laser power control circuit 406 is used for the data reproducing device 10.₁, 10₂(Synchronization signal generation circuit 108₁, 108₂(FIG. 2)) input from the clock signal S108₁, S108₂In synchronization with each other, the recording data input from the system control circuit 408 is converted into predetermined recording signals for recording on the magneto-optical disk 2 (the outer recording area 202 and the inner recording area 204), and the HF superimposition is performed. Output to the circuit 424.
[0024]
Further, the laser power control circuit 406 adjusts the intensity of the laser beam applied to the magneto-optical disk 2 (the outer recording area 202 and the inner recording area 204) when reading the recording data from the magneto-optical disk 2.
The laser power control circuit 406 includes an RF circuit 404.₁404₂The intensity of the laser beam applied to the magneto-optical disk 2 (the outer peripheral recording area 202 and the inner peripheral recording area 204) when the recording data is written to the magneto-optical disk 2 is adjusted based on the RF signal input from the above.
The HF superimposing circuit 424 superimposes a high-frequency signal (HF) on the recording signal input from the laser power control circuit 406 and outputs it to the laser diode 426.
[0025]
FIG. 2 is a diagram showing the configuration of the main components used when the optical disk device 4 shown in FIG. 1 reproduces recorded data from the magneto-optical disk 2.
As shown in FIG. 2, when the optical disk device 4 reproduces recording data from the magneto-optical disk 2, in addition to the laser power control circuit 406, the spindle motor 450, etc., the head movable unit 44, respectively.₁44₂The optical head fixing unit 42 irradiates the magneto-optical disk 2 with laser light, detects the laser light returned from the magneto-optical disk 2, and generates an RF signal.₁, 42₂The part of the magneto-optical disk 2 on which recording data is recorded / reproduced and the optical head fixing part 42₁, 42₂Head movable part 44 for guiding the laser beam between₁44₂RF circuit 404₁404₂, Data reproducing apparatus 10₁, 10₂Then, the data output circuit 20 and the SCSI controller 18 operate (hereinafter, each component of the optical disk device 4 will be referred to as the data reproducing device 1).
[0026]
In the data reproducing apparatus 1, the RF circuit 404₁404₂Are respectively optical head fixing portions 42.₁, 42₂Reproduction amplifier 100 for amplifying the RF signal generated by the photodiode 422₁, 100₂An equalizer circuit (EQ circuit) 102 for equalizing the amplified RF signal₁, 102₂Consists of
[0027]
Data reproducing apparatus 10₁, 10₂Are respectively comparator circuits 104.₁, 104₂, Data latch circuit 106₁, 106₂, Synchronization signal generation circuit 108₁, 108₂, Decoding circuit 110₁, 110₂And FIFO circuit 112₁, 112₂, 114₁, 114₂Consists of
The data output circuit 20 includes a clock generation circuit 12, an ECC processing circuit 14, and a serial / parallel conversion circuit (SPC) 16.
[0028]
FIG. 3 is a diagram showing the outer periphery recording area 202 and the inner periphery recording area 204 provided in the magneto-optical disk 2 shown in FIGS.
As shown in FIG. 3, the recording area of the magneto-optical disk 2 is divided into an outer peripheral recording area 202 and an inner peripheral recording area 204 in the radial direction.₁404₂And data reproducing apparatus 10₁, 10₂Reads the recording signals recorded in the outer recording area 202 and the inner recording area 204, respectively, and reproduces the recording data.
The magneto-optical disk 2 (the outer periphery recording area 202 and the inner periphery recording area 204) is provided with a spiral track, and the track is divided into sectors a.
[0029]
FIG. 4 is a diagram showing the configuration of the sector a provided on the track of the magneto-optical disk 2 shown in FIG.
As shown in FIG. 4, the sector a provided on the track of the magneto-optical disk 2 has a 55-byte address part (precoded) formed in advance on the track of the magneto-optical disk 2 and 21 (15) bytes. It consists of an ALPC area, a VFO4 area of 18 (12) bytes, and a data area of 2,978 (2026) bytes. In the description related to FIG. 4, numerical values outside () indicate numerical values in the outer peripheral recording area 202, and numerical values in () indicate numerical values in the inner peripheral recording area 204.
[0030]
The address part is composed of a 5-byte sector mark area SM, a 12-byte VFO1 area, an 8-byte VFO2 area, an 8-byte VFO3 area, a 1-byte AM1 area, an AM2 area, an AM3 area, and a post-data area PA. Is done.
[0031]
The ID1 area, ID2 area, and ID3 area (hereinafter, these areas are collectively referred to as “ID area”) are a 2-byte track number area, a 1-byte sector number area, and It consists of a 2-byte CRC area and a post-data area PA (constant data 00h) (“h” added after the numerical value 00 to FF indicates a hexadecimal number).
As shown in the upper right of FIG. 4, the data area includes a synchronization signal area (SYNC), and a data area in which the data area (DATA) and the resynchronization signal area are alternately repeated. 00h) is provided later.
[0032]
Data recorded in the main area of sector a of the magneto-optical disk 2 shown in FIG. 4 will be described.
In the sector mark area SM, data indicating the head of the sector a is written.
In the VFO1 area, VFO2 area, VFO3 area, and VFO4 area (hereinafter, these areas are collectively referred to as “VFO area”), for example, 55h or AAh, which has a frequently changed bit pattern, is written. The RF signals obtained from these regions are mainly used for the synchronization signal generation circuit 108.₁, 108₂Clock signal S108₁, S108₂Used for playback. Therefore, the data in the VFO area has no effective meaning. As will be described later with reference to FIG.₁, S108₂Are different, for example, 46.90224 MHz and 32.11488 MHz, respectively.
Data indicating that the subsequent area is an ID area is written in the AM1, AM2 and AM3 areas.
[0033]
The number of the track to which the sector a belongs is written in the track number area of the ID area, the number of the sector a is written in the sector number area, and the data of the data written in the track number area and the sector number area are written in the CRC area. A CRC code for error correction is written, and in the post-data area PA, for example, RLL (1, 7) -encoded data (encoded constant data) of the constant data post-positioned in the CRC area is written.
[0034]
Here, since the encoding constant data is 6 bits corresponding to the 4-bit numerical value 0, the remaining 4 bits are arbitrary data.
The encoded constant data written in the post-data area PA is data necessary for RLL (1, 7) decoding of the last two bits of the CRC code written in the CRC area.
As described above, the same data is precoded three times in the address area as the VFO area, AM area and ID area in order to ensure the reliability of these data.
[0035]
Data used for synchronization detection is written in the synchronization signal area SYNC of the data area.
In the data area, encoded data obtained by encoding the recording data by, for example, RLL (1, 7) encoding is written.
Data used for resynchronization detection is written in the resynchronization signal area RESYNC.
Coding constant data is written in the post-data area PA. The encoding constant data written in the post-data area PA is data necessary for decoding the data written in the data area.
[0036]
With reference to FIG. 2 again, each component of the data reproducing apparatus 1 will be described.
Data reproducing apparatus 10₁, 10₂In FIG.₁, 104₂Are respectively EQ circuits 102₁, 102₂Is compared with a predetermined threshold value, and a digital signal S104 is compared.₁, S104₂(Hereinafter, the optical disk device 4 (data reproducing device 10₁, 10₂Etc.) is also converted to “signal Sx”, and the data latch circuit 106₁, 106₂And synchronization signal generation circuit 108₁, 108₂Output for.
[0037]
Synchronization signal generation circuit 108₁, 108₂Are each composed of a PLL circuit or the like, and an EQ circuit 102.₁, 102₂The signal S104 converted into a digital signal by₁And the clock signal S104 for the inner recording area 204₂The clock signal S108 synchronized with each other₁, S108₂And the data latch circuit 106₁, 106₂And FIFO circuit 112₁, 112₂, 114₁, 114₂And output to the laser power control circuit 406.
[0038]
Data latch circuit 106₁, 106₂Are respectively synchronized signal generation circuits 108.₁, 108₂Input from the clock signal S108₁, S108₂In synchronization with the comparator circuit 104₁, 104₂Signal S104 input from₁, S104₂And the decoding circuit 110₁, 110₂Output for.
Synchronization signal generation circuit 108₁, 108₂Are data latch circuits 106, respectively.₁, 106₂The FIFO circuit 112 decodes the recording data from the data latched by the₁, 112₂, 114₁, 114₂Output for.
[0039]
FIFO circuit 112₁, 114₁And FIFO circuit 112₂, 114₂Each constitutes a double buffer, and each of the decoding circuits 110₁, 110₂The recording data decoded by the above is alternately buffered, and the FIFO circuit 112₁, 114₁And FIFO circuit 112₂, 114₂The recording data S10 to the ECC processing circuit 14 at the same timing.₁, S10₂Is output.
[0040]
In the data output circuit 20, the clock generation circuit 12 includes a data reproduction device 10.₁, 10₂(FIFO circuit 112₁, 112₂, 114₁, 114₂) Generates a clock signal S12 that defines the timing of error correction processing (ECC processing) and output of the recording data input from (), and outputs it to the ECC processing circuit 14.
[0041]
The ECC processing circuit 14 synchronizes with the clock signal S12 input from the clock generation circuit 12, and the data reproduction device 10₁, 10₂(FIFO circuit 112₁, 112₂, 114₁, 114₂) Input from the recording data S10₁, S10₂The error correction processing is performed using the ECC code included in the recording data S10.₁, S10₂Are multiplexed and output to the serial / parallel conversion circuit 16 as serial recording data S14.
[0042]
The serial / parallel conversion circuit 16 performs serial / parallel conversion on the recording data S16 input in the serial format, and outputs it to the SCSI controller 18 as the parallel format recording data S16.
The SCSI controller 18 outputs recording data to the outside in synchronization with the clock signal S12 in accordance with the SCSI protocol.
[0043]
Hereinafter, with reference to FIG. 1 and FIG. 2, the operation of reproducing recorded data of the optical disc device 4 (data reproducing device 1) will be described.
The spindle motor 450 rotates the magneto-optical disk 2.
The linear motor 440 has the head movable unit 44 at a target position on the magneto-optical disk 2 (the outer recording area 202 and the inner recording area 204).₁44₂To perform seek operation.
[0044]
The laser power control circuit 406 is connected to the optical head fixing unit 42 via the HF superimposing circuit 424.₁, 42₂Each laser diode 426 is controlled to irradiate the magneto-optical disk 2 (the outer peripheral recording area 202 and the inner peripheral recording area 204) with laser light.
The laser beam reflected by the magneto-optical disk 2 (the outer periphery recording area 202 and the inner periphery recording area 204) and including the recording signal is the optical head fixing portion 42.₁, 42₂Detected by each photodiode 422 and converted into an electrical RF signal, the RF circuit 404₁404₂Is output for.
[0045]
RF circuit 404₁404₂Are respectively optical head fixing portions 42.₁, 42₂Each of the RF signals in the outer periphery recording area 202 and the inner periphery recording area 204 input from is amplified and equalized, and the data reproducing apparatus 10₁, 10₂Output for.
Data reproducing apparatus 10₁, 10₂In FIG.₁, 104₂Are respectively RF circuits 404.₁404₂The RF signal input from the digital signal S104₁, S104₂Convert to
On the other hand, the synchronization signal generation circuit 108₁, 108₂Are respectively signal S104.₁, S104₂In synchronization with the clock signal S108₁, S108₂Is generated.
[0046]
Data latch circuit 106₁, 106₂The clock signal S108₁, S108₂The recording signal converted into the digital format in synchronization with the signal is held (latched), and the decoding circuit 110₁, 110₂Output for.
Decoding circuit 110₁, 110₂Are data latch circuits 106, respectively.₁, 106₂For example, the recorded signal is reproduced by RLL (1, 7) decoding.
[0047]
FIFO circuit 112₁, 114₁And FIFO circuit 112₂, 114₂Are respectively clock signals S108.₁, S108₂Recording data alternately reproduced in synchronism with the data and buffering the data, thereby reproducing the data reproducing apparatus 10₁, 10₂The recording data S10 is synchronized with the output timing between₁, S10₂Is output to the data output circuit 20.
In the data output circuit 20, the clock generation circuit 12 generates a clock signal S12. The ECC processing circuit 14, the serial / parallel conversion circuit 16, and the SCSI controller 18 operate in synchronization with the clock signal S12, and input recording data S10.₁, S10₂Is corrected and output to the outside according to the SCSI protocol.
[0048]
As described above, according to the optical disk device 4 (data reproducing device 1) according to the present invention, a plurality of outer recording areas 202 and inner recording areas 204 each corresponding to the magneto-optical disk 2 divided in the radial direction. Optical system (optical head fixing portion 42)₁, 42₂And head movable part 44₁44₂) Can be used to reproduce recorded data.
[0049]
Therefore, according to the optical disk device 4 (data reproducing device 1), the head movable portion 44 is compared with the case where the entire recording area of the magneto-optical disk 2 is handled as one recording area.₁44₂The seek time can be shortened to about ½.
The optical disk device 4 (data reproducing device 1) has two sets of optical head fixing portions 42.₁, 42₂And head movable part 44₁44₂Since the recording data is read out from the magneto-optical disk 2 using the, the data rate can be doubled as compared with the case where the recording data is reproduced using only one set of heads.
[0050]
In the optical disk device 4 (data reproducing device 1), the data reproducing device 10₁, 10₂Are respectively synchronized signal generation circuits 108.₁, 108₂Independently of the clock signal S108.₁, S108₂And a double buffer FIFO circuit 112₁, 112₂, 114₁, 114₂Buffering and recording data S10₁, S10₂Therefore, for example, as shown in FIG. 5, the recording positions of the recording data are not aligned in the outer recording area 202 and the inner recording area 204, and therefore, the decoding circuit 110 is not provided.₁, 110₂Therefore, it is possible to cope with the case where the recording data is decoded and output at different timings.
[0051]
The magneto-optical disk 2 is further divided into three or more recording areas in the radial direction, and an optical head fixing part, a head movable part, an RF circuit and a data reproducing device are added for each increased recording area. The optical disk device 4 (data reproducing device 1) may be configured to further shorten the seek time and increase the data rate of recorded data to be reproduced.
[0052]
Further, the optical disk device 4 (data reproducing device 1) can be applied not only to the magneto-optical disk but also to other types of optical recording media such as a write-once optical disk.
Each component of the optical disk device 4 (data reproducing device 1) may be configured in software or hardware as long as the same function and performance can be realized.
[0053]
Second embodiment
The second embodiment of the present invention will be described below.
FIG. 6 is a diagram showing a configuration of main components used when the optical disk device 4 shown in FIG. 1 reproduces recorded data from the magneto-optical disk 2 in the second embodiment.
[0054]
In the second embodiment, when reproducing recorded data from the magneto-optical disk 2, the data reproducing apparatus 10 of the data reproducing apparatus 1 shown in FIG.₁To FIFO circuit 114₁Data reproducing apparatus 40 excluding₁The data reproducing device 10 of the data reproducing device 1₂To synchronization signal generation circuit 108₂And FIFO circuit 114₂Data reproducing apparatus 40 excluding₂The data output circuit 22 using the clock generation circuit 24 operates instead of the clock generation circuit 12 of the data output circuit 20 of the data reproducing apparatus 1.
[0055]
Hereinafter, the component shown in FIG. 6 is referred to as a data reproducing device 3. Also, the constituent parts of the data reproducing device 3 shown with the same reference numerals as the constituent parts of the data reproducing device 1 have the same functions and perform the same operations.
In the second embodiment, the optical disk device 4 (data reproducing device 3) records in the outer recording area 202 and the inner recording area 204 of the magneto-optical disk 2 as shown in FIG. Recording data is recorded at the same position, and the recorded data is reproduced.
[0056]
FIG. 8 is a diagram showing a configuration of the clock generation circuit 24 shown in FIG.
As shown in FIG. 8, the clock generation circuit 24 includes an oscillation circuit (OSC) 120, a switch circuit 134, an oscillation circuit 132, a frequency divider 122, a voltage controlled oscillation circuit (VCO) 124, a frequency divider 126, and a phase comparison circuit. 128 and a low-pass filter circuit 130.
In FIG. 8, the clock signal S24c when recording / reproducing the recording data on the outer recording area 202 is 46.90224 MHz, and the recording data is recorded / reproduced on the inner recording area 204. The case where the clock signal S24b is 32.11488 MHz is illustrated.
[0057]
The oscillation circuit 120 generates a clock signal of 46.9902 MHz, for example, and outputs it to the switch circuit 134.
The switch circuit 134 is controlled by the system control circuit 408 (FIG. 1), for example. When recording data is recorded on the magneto-optical disk 2, the clock signal generated by the oscillation circuit 120 is selected and the recorded data is reproduced. Includes a data reproducing device 40.₁Synchronization signal generation circuit 108₁Input from the clock signal S108₁And the frequency dividing circuit 122, the laser power control circuit 406 (FIG. 1), and the data reproducing device 40 as the clock signal S24c used when recording the recording data in the outer periphery recording area 202.₁Output for.
[0058]
The oscillation circuit 132 is composed of, for example, a PLL circuit, and generates a clock signal S24a (> 46.9902 MHz + 31.14488 MHz) synchronized with the clock signal output from the switch circuit 134 and outputs the clock signal S24a to the ECC processing circuit 14 or the like.
The frequency divider 122 divides the clock signal output from the switch circuit 134, for example, by 1/517.
[0059]
The frequency dividing circuit 126 uses the clock signal S24b generated by the voltage controlled oscillation circuit 124 as the clock signal S24b used for recording and reproducing the recording data with respect to the 1/354 recording area 204, and the frequency dividing circuit 126 and the data reproducing device 40.₂Output for.
The phase comparison circuit 128 detects the phase difference between the output signals of the frequency dividing circuits 122 and 126.
The low-pass filter circuit 130 removes the high frequency component of the signal obtained as a result of the phase comparison by the phase comparison circuit 128 and outputs it as a control signal to the voltage controlled oscillation circuit 124.
[0060]
The clock generation circuit 24 constitutes a kind of PLL circuit, and a data reproduction device 40.₁When reproducing data from the outer periphery recording area 202, the synchronization signal generation circuit 108₁Generated by the clock signal S108₁Alternatively, the clock signal S24a supplied to the ECC processing circuit 14, the serial / parallel conversion circuit 16, and the SCSI controller 18 (FIG. 1) in synchronization with the clock signal S24c used when recording the recording data in the outer recording area 202. Generate and supply
Further, the clock generation circuit 24 is similar to the clock signal S24a, and the clock signal S108.₁Alternatively, the data reproducing device 40 is synchronized with the clock signal S24c.₂FIFO circuit 112 of₂Etc., the clock signal S108 in the data reproducing apparatus 1 (FIG. 2).₂A clock signal S24b used instead of is generated and supplied.
[0061]
The operation of the optical disc device 4 (FIG. 1) to which the data reproducing device 3 is applied will be described below.
First, the operation when the optical disk device 4 records recording data on the magneto-optical disk 2 (the outer recording area 202 and the inner recording area 204) will be described.
In this case, the switch circuit 134 (FIG. 8) of the clock generation circuit 24 selects the clock signal generated by the oscillation circuit 120 and outputs it to the laser power control circuit 406 as the clock signal S24c. Further, the voltage controlled oscillation circuit 124 of the clock generation circuit 24 generates S24b synchronized with the clock signal S24c and outputs it to the laser power control circuit 406.
[0062]
The system control circuit 408 (FIG. 1) outputs recording data input from the outside via the SCSI controller 18 to the system control circuit 408.
The system control circuit 408 converts the recording data to be recorded in the outer periphery recording area 202 into a recording signal, and synchronizes with the clock signal S24c to synchronize with the HF superimposing circuit 424 and the optical head fixing unit 42.₁And head movable part 44₁To the outer peripheral recording area 202 of the magneto-optical disk 2.
[0063]
In parallel with the recording of the recording data in the outer recording area 202, the system control circuit 408 converts the recording data to be recorded in the inner recording area 204 into a recording signal, and synchronizes with the clock signal S24b. Optical head fixing part 42₂And head movable part 44₂To the inner recording area 204 of the magneto-optical disk 2.
As described above, since both record data in the outer recording area 202 and the inner recording area 204 in synchronization with the clock signals S24c and S24b synchronized with the clock signal output from the oscillation circuit 120, FIG. As shown, the recording positions of the recording data in the outer periphery recording area 202 and the inner periphery recording area 204 are aligned.
[0064]
Next, the optical disk device 4 (data reproducing device 3) to which the data reproducing device 3 is applied records the recording data from the magneto-optical disk 2 (the outer periphery recording region 202 and the inner periphery recording region 204) as shown in FIG. The operation during playback will be described.
In this case, the switch circuit 134 (FIG. 8) of the clock generation circuit 24 is synchronized with the synchronization signal generation circuit 108.₁Generated by the clock signal S108₁The laser power control circuit 406 and the data latch circuit 106 are selected as the clock signal S24c.₁And FIFO circuit 112₁Output for.
[0065]
The laser beam reflected by the magneto-optical disk 2 (the outer periphery recording area 202 and the inner periphery recording area 204) and including the recording signal is the optical head fixing portion 42.₁, 42₂Detected by each photodiode 422 and converted into an electrical RF signal, the RF circuit 404₁404₂Is output for.
[0066]
RF circuit 404₁404₂Are respectively optical head fixing portions 42.₁, 42₂Amplifying and equalizing each of the RF signals of the outer periphery recording area 202 and the inner periphery recording area 204 input from the data reproducing device 40₁, 40₂Output for.
Data reproducing device 40₁, 40₂In FIG.₁, 104₂Are respectively RF circuits 404.₁404₂The RF signal input from the digital signal S104₁, S104₂Convert to
[0067]
On the other hand, the synchronization signal generation circuit 108₁Is signal S104₁In synchronization with the clock signal S108₁And the data latch circuit 106₁, FIFO circuit 112₁And output to the clock generation circuit 24.
The voltage controlled oscillation circuit 124 of the clock generation circuit 24 is connected to the clock signal S108.₁S24b synchronized with (S24c) is generated, and the laser power control circuit 406 and the data reproducing device 40 are generated.₂Data latch circuit 106 of₂And FIFO circuit 112₂Output for.
[0068]
Data latch circuit 106₁, 106₂Are respectively clock signals S108.₁And the recording signal converted into the digital format in synchronization with the clock signal S24b, and the decoding circuit 110₁, 110₂Output for.
Decoding circuit 110₁, 110₂Are data latch circuits 106, respectively.₁, 106₂The recorded signal is reproduced by decoding the recording signal held in the recording medium.
[0069]
FIFO circuit 112₁And FIFO circuit 112₂Are respectively clock signals S108.₁Recording data reproduced in synchronization with the clock signal S24b is taken in, buffered and output.
In the data output circuit 20, the ECC processing circuit 14, the serial / parallel conversion circuit 16, and the SCSI controller 18 operate in synchronization with the clock signal S24a, and input recording data S40.₁, S40₂Is corrected and output to the outside according to the SCSI protocol.
In the above description of the recording / reproducing operation of the recording data of the optical disk device 4 (data reproducing device 3), the recording data of the laser power control circuit 406, the spindle motor 450, etc. are described for the sake of simplification. A description of the operation of the components of the optical disk device 4 that are not directly related to reproduction is omitted.
[0070]
As described above, when recording data is recorded at the same recording position between the outer recording area 202 and the inner recording area 204 and the recorded recording data is reproduced, the recording signal from the outer recording area 202 and the inner recording area are recorded. The timing with the recording signal from 204 is already suitable at the stage of reading.
[0071]
Therefore, when the recording data is reproduced from the recording signal recorded on the magneto-optical disk 2 (the outer recording area 202 and the inner recording area 204) by the optical disk device 4 (data reproducing device 3), the data reproducing device 1 (FIG. 2). ) Data reproducing apparatus 10₁, 10₂As described above, the FIFO circuit is configured as a double buffer, and it is not necessary to synchronize the timing of the recording data reproduced from the outer recording area 202 and the inner recording area 204 by the FIFO circuit.
[0072]
Therefore, according to the optical disk device 4 (data reproducing device 3), a plurality of optical systems corresponding to a plurality of recording areas provided on the magneto-optical disk 2 are used, and data recording is performed using clock signals having different frequencies. Despite reproduction, it is not necessary to synchronize the timing for reading the data recorded from each of the plurality of recording areas, and error correction processing for the reproduced recording data can be easily performed.
The data reproducing apparatus 3 can be modified in the same manner as the data reproducing apparatus 1 (FIG. 2).
[0073]
【The invention's effect】
As described above, according to the data reproducing apparatus of the present invention, the seek time for the optical disc can be shortened as compared with the case where the entire recording area of the optical disc is handled as one recording area.
Further, according to the data reproducing apparatus of the present invention, data can be read from the optical disc at a higher data rate than when only one set of optical systems is used.
[0074]
In addition, according to the data reproducing apparatus and the data recording method of the present invention, data is recorded using a synchronized clock signal while having different frequencies for each of a plurality of recording areas of the optical disc. The data can be recorded with the recording positions aligned between the recording areas, and the data can be read from each of the plurality of recording areas at a synchronized timing.
In addition, according to the data reproducing apparatus and the data recording method of the present invention, even if data is reproduced using a plurality of clock signals and a plurality of recording areas of the optical disc, error correction processing and the like are complicated. There is no.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an optical disc apparatus according to the present invention in a first embodiment.
FIG. 2 is a diagram showing a configuration of main components (first data reproducing device) used when the optical disk device shown in FIG. 1 reproduces recorded data from a magneto-optical disk.
3 is a diagram showing an outer peripheral recording area and an inner peripheral recording area provided in the magneto-optical disk shown in FIGS. 1 and 2. FIG.
4 is a diagram showing a configuration of a sector a provided on a track of the magneto-optical disk shown in FIG. 3;
5 is a diagram showing recording positions of recording data recorded in an outer peripheral recording area and an inner peripheral recording area of the magneto-optical disk shown in FIGS. 1 and 2. FIG.
FIG. 6 is a diagram showing a configuration of main components used when the optical disk device shown in FIG. 1 reproduces recorded data from a magneto-optical disk in the second embodiment.
FIG. 7 is a diagram showing recording positions of recording data recorded in an outer peripheral recording area and an inner peripheral recording area of the magneto-optical disk by the data recording method according to the present invention.
8 is a diagram showing a configuration of a clock generation circuit shown in FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 4 ... Optical disk apparatus, 2 ... Magneto-optical disk, 202 ... Outer periphery recording area, 204 ... Inner periphery recording area, 10₁, 10₂, 40₁, 40₂... Data reproduction device 104₁, 104₂... Comparator circuit, 106₁, 106₂... Data latch circuit 108₁, 108₂... Synchronization signal generation circuit 110₁, 110₂... Decoding circuits 1 and 112₁, 112₂, 114₁, 114₂... FIFO circuit, 20, 22 ... Data output circuit, 12, 24 ... Clock generation circuit, 120 ... Oscillation circuit, 122,126 ... Division circuit, 124 ... Voltage control oscillation circuit, 128 ... Phase comparison circuit, 130 ... Low pass filter Circuit: 132: Oscillation circuit, 14: ECC processing circuit, 16: Serial / parallel conversion circuit, 18 ... SCSI controller, 406 ... Laser power control circuit, 408 ... System control circuit, 450 ... Spindle motor, 452 ... Tracking servo circuit, 454 ... Focus servo circuit, 456 ... Radial servo circuit, 458 ... Disk servo circuit, 42₁, 42₂... Optical head fixing part, 420 ... Preamplifier, 422 ... Photodiode, 424 ... HF superposition circuit, 426 ... Laser diode, 44₁44₂... Head movable part, 440 ... Linear motor, 442 ... Optical system

Claims (7)

A data recording apparatus for recording data on an optical disc recording medium having a plurality of recording areas divided in the radial direction,
Means for generating a plurality of recording clock signals corresponding to each of the plurality of recording areas and having phases synchronized with each other;
Means for converting the record data to be recorded on each of the plurality of recording areas, in synchronization with the plurality of record clock signal to each of the plurality of predetermined recording signal,
The recording positions in the circumferential direction of the recording data in the plurality of recording areas correspond to each of the plurality of recording signals so as to be relatively aligned with positions where data can be read out at a timing synchronized with each recording area at the time of reading. A data recording apparatus comprising: means for simultaneously recording each of the plurality of recording signals in parallel to each of the plurality of recording areas in synchronization with a recording clock signal . The means for generating a plurality of recording clock signals is used for recording a recording data in one recording area of the plurality of recording areas and recording data in the other recording area. Create from the clock,
The data recording apparatus according to claim 1. The one recording area is an inner recording area, and the other recording area is an outer recording area.
The data recording device according to claim 2. A data recording method for recording data on an optical disc recording medium having a plurality of recording areas divided in the radial direction,
Corresponding to each of the plurality of recording areas, generating a plurality of recording clock signals whose phases are synchronized with each other,
Recording data to be recorded in each of the plurality of recording areas, in synchronization with the plurality of record clock signal into a plurality of predetermined recording signal,
The recording positions in the circumferential direction of the recording data in the plurality of recording areas correspond to each of the plurality of recording signals so as to be relatively aligned with positions where data can be read out at a timing synchronized with each recording area at the time of reading. In synchronization with the recording clock signal, the plurality of recording signals are simultaneously recorded in parallel in each of the plurality of recording areas ,
Data recording method. When generating the plurality of recording clock signals, a clock for recording recording data in one of the plurality of recording areas is used to record recording data in the other recording area. The data recording method according to claim 4, wherein the data recording method is generated from a clock. The one recording area is an inner recording area, and the other recording area is an outer recording area.
The data recording method according to claim 5. An optical disc recording medium having a plurality of recording areas divided in the radial direction,
The recording data recorded in each of the plurality of recording areas is converted into each of a plurality of predetermined recording signals in synchronization with a plurality of recording clock signals corresponding to each of the plurality of recording areas and having phases synchronized with each other. And
The recording positions in the circumferential direction of the recording data in the plurality of recording areas are synchronized with the plurality of recording clock signals so that they are relatively aligned with the positions where the data can be read out at the timing synchronized with each recording area at the time of reading. An optical disc recording medium in which each of the plurality of recording signals is recorded in each of the plurality of recording areas .

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