JP2001110131A - Optical disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk recording/reproducing device capable of accurately recording/reproducing by surely corresponding to the increase of the read rate and write rate in the recording/reproducing operation with respect to the optical disk and also capable of reducing the manufacturing cost by suppressing the scale increase of the device. SOLUTION: In the reproducing operation of the optical disk 1, the decode operation of an encode/decode circuit 17 is executed by making a high speed reproducing memory 22 selected by a buffer manager 18 as the buffer, and the encode operation in the recording operation is executed by making a low speed and large capacity recording memory 23 selected by the buffer manager 18 as the buffer, then the highly accurate recording/reproducing operation surely corresponding to the increase of the read rate and write rate and the continuity of recorded data at the write time is allowed, and the reproducing memory 22 and the recording memory 23 are separately disposed to the inside and outside of a control unit 25, and the capacity of the high speed reproducing memory 22 is suppressed, and also the cost is suppressed by the miniaturization, then the reduction of the manufacturing cost is attained by miniaturizing the whole device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording / reproducing apparatus for performing recording / reproducing operations on an optical disk.

[0002]

2. Description of the Related Art In today's highly information-oriented society, a storage device having a large storage capacity and easy handling is desired in order to process enormous information, record and save the information, and reproduce the information. Is widely used as an image memory for images and documents, or as a code data memory of a computer to satisfy such demands. This optical disc has a read-only
CD-ROM (Compact Disk-Read O
nly Memory), DVD-ROM (Digit)
al Versatile Disk-Read O
nly Memory) and writable media include CD-R (Compact Disk-Rec).
orderable), DVD-R (Digital Ve)
rsaticleDisk-Recordable),
CD-RW (Compact Disk-Rewrite)
able), DVD-RW (Digital Vers)
attic disk-rewritable).

The read speed of these optical discs at the time of reproduction is increasing year by year. In the case of a CD-ROM, reproduction is performed at a read speed 50 times higher than the normal read speed of a conventional audio signal. Reproduction is also performed at a read speed of 10 times or more in ROM. In order to perform such a high-speed reproduction operation, a DRAM (Dynamic Random Acc) having a normal instruction execution speed is used.
The use of ess Memory) may prevent the execution operation based on the access from being performed in time. Therefore, a DRAM or SR having a wide bandwidth such as 64 bits or 128 bits and a high execution speed is provided in a recording / reproducing unit of the apparatus.
By loading AM, ECC (Error Co.)
Generally, these DRAMs and SRAMs are used as a buffer memory for signal processing for correction by means of RRC (Reduction Code) and for sending and receiving signals to and from a host computer.

As described above, it is necessary to prepare DRAMs and SRAMs having a high execution speed in proportion to a required read speed as a DRAM or an SRAM used as a buffer memory used in combination. Since the control itself is performed on the drive side, an intermittent operation of data transfer is allowed. In particular, it is not necessary to use a large-capacity memory. Usually, a memory having a high execution speed of 1 Mbit to 2 Mbit is used.

On the other hand, CD-R, CD-RW, D
When performing a recording operation on a VD-R or DVD-RW,
It is necessary to execute a recording operation without losing the continuity of data. In particular, with a write-once disc such as a CD-R or DVD-R, if writing of data fails, the disc cannot be used. For this reason, when performing a recording operation on these optical disks, it is necessary to avoid a buffer underrun on the drive side due to a decrease in the data transfer speed from the host side and loss of data continuity.

In order to avoid this state, a player with a higher write speed needs to have a larger memory capacity. For example, in order to perform a quad-speed write on a CD-R, 8 players are required.
It is general practice to mount a 16-Mbit to 16-Mbit memory and to mount a 16-Mbit to 32-Mbit buffer memory in order to perform 8 × speed writing.
As described above, in response to a future increase in the write speed, a larger capacity of the buffer memory is further required, but generally, the write speed does not need to be as high as the read speed.

[0007]

As described above, the control unit for controlling the recording / reproducing operation for the optical disk has a function corresponding to an increase in the reading speed of the optical disk.
It is required that a memory with a high execution speed is mixedly mounted, and at the time of recording on an optical disc, the memory is required to have a large capacity corresponding to an increase in the write speed. Therefore, as the reading speed and the writing speed for the optical disk are increased, the memory mounted in the control unit is used at a high execution speed and a large capacity, and the memory mounted is increased in size. Problems also occur in manufacturing costs.

The present invention has been made in view of the current state of the above-mentioned optical disk recording / reproducing apparatus, and an object of the present invention is to appropriately increase the read speed and the write speed during the recording / reproducing operation on the optical disk. Correspondingly, an object of the present invention is to provide an optical disk recording / reproducing apparatus capable of performing a high-precision recording / reproducing operation, suppressing an increase in the size of the apparatus and reducing manufacturing costs.

[0009]

According to a first aspect of the present invention, there is provided a recording / reproducing apparatus for recording / reproducing information on / from a first optical disk exclusively for reproduction or a second optical disk on which information can be written. An optical disc recording / reproducing apparatus, comprising: a recording / reproducing unit for performing the recording / reproducing unit; and a control unit for controlling the operation of the recording / reproducing unit, for performing a reproducing operation on the first optical disc and a reproducing operation or a recording operation on the second optical disc. A reproduction memory provided in the control unit for writing and reading information data and control data during a reproduction operation on the first optical disk or the second optical disk; and an external connection to the control unit. When information is recorded on the second optical disk, information data and control data are written and read, and the reproduction memory is read. Large storage capacity than Li, is characterized in that it has a recording memory is low instruction execution speed than the reproduction memory.

According to such means, at the time of reproducing operation on the first optical disk or the second optical disk performed at a read speed higher than the write speed at the time of the recording operation on the optical disk, communication with the host computer is performed. In a control unit that performs transmission and reception of signals and controls a reproduction operation, a reproduction memory mounted on the control unit operates at a high execution speed for operation processing of information data and control data signals. Used as a buffer memory, a high-precision reproduction operation is performed in response to an increase in read speed.

In addition, since it is necessary to maintain continuity of data transfer from the host computer, during a recording operation on the second optical disk which requires a higher storage capacity than during a reproducing operation on the optical disk, a signal is exchanged with the host computer. In the control unit that controls the reproduction operation by transmitting and receiving the information, the recording memory externally connected to the control unit has a lower execution speed than the reproduction memory for the operation processing of the information data and the control data signal. , And is used as a buffer memory having a larger storage capacity than the reproduction memory, and a high-accuracy recording operation is performed in response to a high write speed and data transfer continuity.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of the present embodiment.

In this embodiment, as shown in FIG. 1, a recording / reproducing unit 24 for performing a recording / reproducing operation with respect to the optical disc 1 to be set is provided. A control unit 25 for performing control is connected, and the control unit 25 is provided with an ATAPI
(AT Attachment packet int
A host computer 21 that transmits and receives signals to and from the control unit 25 at the time of control is connected to the control unit 25 via an interface 20, and a recording memory 23 used at the time of recording operation is externally connected to the control unit 25. I have.

In the recording / reproducing unit 24, a turntable 1T on which the optical disk 1 is set is rotatably disposed by a spindle motor 8, and the spindle motor 8
Is connected to the driver 10. Further, a pickup 2 is arranged in close proximity to the optical disc 1, and a drive mechanism 6 for transferring the pickup 2 in the radial direction of the optical disc 1 is attached to the pickup 2.
Is connected to a drive motor 7. Further, a laser driver 3 for emitting a laser in the pickup 2 is connected to the pickup 2, and a power control circuit 5 for controlling the emission power of the laser is connected to an input terminal of the laser driver 3. Then, the recording / reproducing unit 24
Is provided with a servo processor 11 for controlling a servo operation at the time of recording / reproduction. An output terminal of the servo processor 11 is connected to the driver 10 and the drive motor 7, respectively.

A detection signal output terminal of the pickup 2 is provided with a matrix operation circuit for performing arithmetic processing on the detection signal from the pickup 2 to obtain a reproduction signal Frf, a focus error signal Ffe, and a tracking error signal Ft.
e, an RF amplifier 12 that outputs a wobble signal Fw is connected. The output terminal of the reproduction signal Frf of the RF amplifier 12 has EFM modulation (Eight to Right).
Fourth Modulation) 2
The value conversion circuit 13 is connected, and the output terminals of the focus error signal Ffe and the tracking error signal Fte of the RF amplifier 12 are connected to the servo processor 11, respectively. An output terminal of the wobble signal Fw of the RF amplifier 12 outputs an absolute address signal Fa by demodulating the wobble signal Fw and outputs a spindle error signal Fse based on groove information obtained from the wobble signal Fw. It is connected to a circuit 15. Further, the recording / reproducing unit 24 is provided with a recording signal forming circuit 14 for generating a recording signal.
Are connected to the laser driver 3.

On the other hand, the control unit 25 is provided with a system controller 16 for controlling the entire operation. The system controller 16 has an encode / decode circuit 17 for performing an encoding operation at the time of recording and a decoding operation at the time of reproduction. Is connected to the encoding / decoding circuit 17
Includes a buffer manager 1 for controlling a buffer operation.
8 are connected. The buffer manager 18 has a 64-bit width or a 128-bit width, a high execution speed, and a DRAM having a storage capacity of about 1 Mbit to 4 Mbit.
And an SRAM are connected as the reproduction memory 25 in the control unit 25. An output terminal of the encode / decode circuit 17 is connected to an input terminal of the recording signal forming circuit 14 and an input terminal of the servo processor 11, respectively. Connected to input terminal. Further, an output terminal of the system controller 16 is connected to an input terminal of the power control circuit 5, and an output terminal of the address decode circuit 15 is connected to an input terminal of the system controller 16.

The buffer manager 18 has a storage capacity of 8M outside the control unit 25.
high memory capacity of 64 to 64 Mbits
A RAM such as a DRAM whose execution speed is lower than 5 is externally connected as the recording memory 23. Further, the encoding / decoding circuit 17 of the control unit 25 has an ATA
The host computer 21 is connected via the PI 20.

The recording / reproducing operation of this embodiment having the above-described configuration will be described. First, the reproducing operation of the present embodiment will be described. At the time of the reproducing operation, a CD-ROM or DVD-ROM to be reproduced, or a CD-R or DVD-ROM on which information is already recorded, is recorded on the turntable 1T.
R, CD-RW, DVD-RW, etc. are set. In the following, a case where reproduction of a CD-ROM is performed will be described as an example.

When the CD-ROM is set on the turntable 1T and the start button of the apparatus is turned on, a drive signal is input from the servo processor 11 to the driver 10 and the drive motor 7 according to a command from the system controller 16, and the spindle motor is driven. 8 rotates the CD-ROM set on the turntable 1T to CL around the axis.
V (constant linear velocity), and the drive mechanism 6 is driven by the drive motor 7, so that the pickup 2
Starts linear transfer from the peripheral edge of the optical disc 1 toward the center. At the same time, the laser driver 3 is driven by the drive signal from the system controller 16 via the power control circuit 5, and the laser light emitted from the laser diode in the pickup 2 is recorded on the recording track of the optical disk 1 via the objective lens. The light illuminated on the surface and reflected from the recording track surface is detected by a photodetector in the pickup 2, photoelectrically converted, and input to the RF amplifier 12 as a detection signal Fd.

The RF amplifier 12 generates a reproduction signal Frf, a wobble signal Fw, a focus error signal Ffe, and a tracking error signal Fte by performing a matrix operation on the detection signal Fd. The wobble signal Fw is input to the address decode circuit 15, and the focus error signal Ffe and the tracking error signal Fte are input to the servo processor 11, respectively.

The address decode circuit 15 generates an absolute address signal Fa by demodulating the wobble signal Fw, and obtains rotation speed information of the spindle motor 8 by injecting groove information into the PLL circuit. , A spindle error signal Fse is generated by comparison with the reference speed information, and the absolute address signal Fa is transmitted to the system controller 16 by the spindle error signal Fse.
Are input to the servo processor 11, respectively.

On the other hand, in the power control circuit 5, based on the level of the monitor light from the monitor detector of the pickup 2, the output level of the laser diode does not change due to a temperature change, but remains at a constant level set by the system controller 16. The control of the laser driver 3 is performed so that Further, the servo processor 11 executes servo control operations of focusing control, tracking control, spindle control, and pickup transfer control based on the focus error signal Ffe, the tracking error signal Fte, and the spindle error signal Fse.

By the way, the binarizing circuit 13 binarizes the reproduced signal Femf and performs EFM modulation to obtain the 8b
It generates an EFM signal Fefm to which a modulation method for mapping it into 14 bits is applied, and generates the EFM signal Fefm.
Is input to the encode / decode circuit 17. In response, the encoding / decoding circuit 17
Based on the recovered clock synchronized with the F signal Femf, 2
The EFM signal Femf supplied from the binarizing circuit 13 is
M demodulated and Cross Interleaved Rea
d Performs a CIRC error correction process using an error correction method called Solomon Code, performs a deinterleave process, and performs a CD-ROM decode process, thereby obtaining reproduction data converted into CD-ROM format data. Further, the encode / decode circuit 17 obtains the rotation speed information of the spindle motor 8 from the reproduction clock, obtains a spindle error signal Fse by comparing with the reference speed information, and this spindle error signal Fse is input to the servo processor 11. You.

In the present embodiment, at the time of the reproducing operation, the reproducing memory 22 is selected by the buffer manager 18, and the decoding operation by the encoding / decoding circuit 17 is executed by using the reproducing memory 22. The obtained reproduction data is stored in the reproduction memory 22. The playback data decoded and stored in the playback memory 22 is read by the buffer manager 18 and sequentially transferred to the host computer 21 via the ATAPI 20.

Next, the recording operation of this embodiment will be described. During a recording operation, a CD-R, DVD-R, or CD-R for which information is to be recorded on the turntable 1T.
RW, DVD-RW, etc. are set. In the following, C
A case in which recording is performed on DR will be described as an example.

In this embodiment, during the recording operation, the recording memory 23 is selected by the buffer manager 18, and the encoding operation by the encoding / decoding circuit 17 is executed using the recording memory 23 as a buffer memory. You. During this recording operation, audio data and CD-ROM data are transferred from the host computer 21 as recording data, and the transferred recording data is input to the encode / decode circuit 17 via the ATAPI 20 and is recorded by the buffer manager 18 for recording. A buffer is stored in the memory 23.

Next, the encoding process by the encoding / decoding circuit 17 is performed on the recording data read from the recording memory 23 by the buffer manager 18, and the CD-ROM format data is
Encoded to CD-R format data, CIR
The C encoding process is performed, the interleaving process and the subcode adding process are performed, and the EFM signal Fefm obtained by the EFM modulation is supplied to the recording signal forming circuit 14.

In the recording signal forming circuit 14, E
The FM signal Fefm is subjected to write equalization, and is supplied to the laser driver 3 as a recording signal Fr. Then, in the laser driver 3, the recording signal Fr is converted into a current signal and supplied to the laser diode of the pickup 2, the laser emits light, and the CD-R set on the turntable 1T is converted into an EFM signal Fefm. A corresponding pit is formed. Other operations including the servo control operation by the servo processor 11 at the time of recording according to the present embodiment and the operation of controlling the output level of the laser beam by the power control circuit 5 are the same as the operations at the time of reproduction already described, and therefore, the description will be repeated. Is not performed.

As described above, according to the present embodiment, when recording / reproducing on / from the optical disc 1, the recording / reproducing unit 24 causes the servo processor 11 to
Rotation control of the optical disc 1 by a spindle motor 8, pickup 2 via a drive mechanism 6 by a drive motor 7
Of the optical disk 1 in the radial direction, servo control for focusing in the pickup 2, and control of the output level of the laser light from the laser diode by the power control circuit 5. At the time of the reproducing operation of the present embodiment, the detection signal Fd from the track recording surface of the optical disk 1 is subjected to a matrix operation by the RF amplifier 12, and the obtained reproduced signal Frf is binarized by the binarization circuit 13.
EFM signal Fefm is generated by FM modulation and input to encode / decode circuit 17. Then, in the encode / decode circuit 17, the EFM signal Femf
FM demodulation is performed, CIRC error correction processing is performed, deinterleaving processing is performed, and reproduction data converted to CD-ROM format data is obtained by CD-ROM decoding processing.

During this reproducing operation, the buffer manager 18 selects the reproducing memory 22 with a high execution speed, and the decoding operation by the encode / decode circuit 17 is executed by using the reproducing memory 22 as a buffer memory and obtained by decoding. The reproduced data is stored in the reproduction memory 2.
2, read out by the buffer manager 18, and sent to the host computer 21 via the ATAPI 20.
Are sequentially transferred.

When information is recorded on the optical disk 1, the buffer memory 18 selects the recording memory 23, and the encoding / decoding circuit 17
Is performed using the recording memory 23 as a buffer memory, and recording data transferred from the host computer 21 is input to the encoding / decoding circuit 17 via the ATAPI 20 and is stored in the recording memory 23 by the buffer manager 18. Buffered. Next, the buffer manager 18 encodes the recording data read from the recording memory 23 by encoding and decoding by the encoding / decoding circuit 17 to convert the CD-ROM format data into CD-R format data, CIRC encoding process, and interleave. Processing and sub-code addition processing are performed, and the obtained EFM signal Fefm is stored in the recording signal forming circuit 1.
4 is supplied. Then, in the recording signal forming circuit 14,
The EFM signal Fefm is subjected to write equalization, and is supplied to the laser driver 3 as a recording signal Fr.
Laser emitted and C set on turntable 1T
A pit corresponding to the EFM signal Fefm is formed for DR.

As described above, according to the present embodiment,
By using the high-speed playback memory 22 as a buffer memory to increase the read speed at the time of playback, a high-precision playback operation can always be performed in an appropriate manner, and a large memory can be stored. By using the recording memory 23 having a large capacity as a buffer memory, it is possible to maintain the continuity of the recording data at the time of recording and perform a high-precision recording operation in response to an increase in the write speed. . Further, the reproduction memory 22 and the recording memory 23 are connected to the control unit 2.
5, the reproduction memory 22 having a high execution speed is reduced in size, and the control unit 25 is prevented from being increased in size. It is also possible to reduce the manufacturing cost by downsizing 22.

In the above embodiment, the case where the optical disc 1 is driven to rotate at a constant linear velocity (CLV) by the spindle motor 8 has been described. However, the present invention is not limited to this embodiment. Instead, the optical disc 1 can be driven to rotate at a constant angular velocity (CAV) by the spindle motor 8.

[0034]

According to the first aspect of the present invention, there is provided an optical disk recording / reproducing apparatus which performs recording / reproducing on / from a read-only first optical disk or a second optical disk on which information can be written. And a control unit for controlling the operation of the recording / reproducing unit. The recording / reproducing unit and the control unit perform a reproducing operation on the first optical disk and a reproducing operation or a recording operation on the second optical disk. . In particular, the control unit according to the first aspect of the present invention is provided with a reproduction memory on which information data and control data are written and read during a reproduction operation on the first optical disk or the second optical disk, The control unit writes and reads information data and control data when recording information on the second optical disk. The control unit has a larger storage capacity than the reproduction memory, and has a higher instruction execution speed than the reproduction memory. A low recording memory is externally connected.

For this reason, according to the first aspect of the present invention, the first optical disc which is performed at a read speed higher than the write speed at the time of the recording operation on the optical disc,
Alternatively, at the time of a reproducing operation for the second optical disk, a signal is exchanged with the host computer to perform a reproducing operation. The playback memory used is used as a buffer memory that operates at a high execution speed, and is suitable for increasing the read speed. A high-precision reproduction operation is performed correspondingly. Also, in order to maintain continuity of data transfer from the host computer,
At the time of the recording operation on the second optical disk which requires a higher storage capacity than at the time of the reproducing operation on the optical disk, the control unit for performing the recording operation by transmitting and receiving signals to and from the host computer performs the recording of the information data and the control data. For signal processing, a recording memory externally connected to the control unit is used as a buffer memory,
A high-precision recording operation is performed corresponding to the increase in the write speed.

As described above, according to the first aspect of the present invention, the storage capacity of the playback memory, which requires a high execution speed, is reduced to the capacity required during the playback operation, and the playback memory mounted on the control unit is controlled. Externally connecting a control memory to a control memory that has a large storage capacity required for recording operation and that can be executed at a lower speed than a reproduction memory, while suppressing an increase in memory size and increase in manufacturing cost. Accordingly, the high-precision reproduction operation for the first optical disk or the second optical disk and the high-precision operation for the second optical An optical disk recording / reproducing apparatus capable of performing the above recording operation, miniaturizing the entire apparatus and reducing the manufacturing cost is provided.

[Brief description of the drawings]

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

[Explanation of symbols]

1. optical disk, 2. pickup, 5. power control circuit, 11. servo processor, 12. RF amplifier, 13. binarization circuit, 14. recording signal forming circuit, 16. system controller , 17-encoding / decoding circuit, 18-buffer manager, 20
..ATAPI, 21..Host computer, 22 ..
-Memory for reproduction, 23-Memory for recording, 24-Recording / reproducing unit, 25-Control unit.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 19/02 501 G11B 19/02 501C

Claims (1)

[Claims] 1. A recording / reproducing unit for recording / reproducing information on / from a read-only first optical disk or a second optical disk into which information can be written, and a control unit controlling the operation of the recording / reproducing unit. An optical disk recording / reproducing apparatus for performing a reproducing operation on the first optical disk and a reproducing operation or a recording operation on the second optical disk, provided in the control unit, wherein the first optical disk or the second A reproduction memory in which information data and control data are written and read during a reproduction operation on the optical disk; and an externally connected to the control unit, the information data and the control data are written when the information is recorded on the second optical disk. Read / write, the storage capacity is larger than the reproduction memory, and the instruction execution speed is faster than the reproduction memory. Optical disc recording and reproducing apparatus characterized by having a low recording memory.