KR20020042008A - Recording/reproducing Apparatus of optical disc - Google Patents

Abstract

PURPOSE: A device for recording and reproducing an optical disc is provided to optimally and compatibly carry out the recording and reproducing for discs of different standards, thereby promoting the convenience of users. CONSTITUTION: A device for recording and reproducing an optical disc includes a pickup part for detecting optical signals from discs or recording information on the discs, a control part for discriminating kinds of the discs from the detected signals and controlling the recording/reproducing according to the discriminated disc kinds, a signal processing part for reading data of first and second discs from the signals detected from the pickup part and detecting control information existing in control information areas of the discs, and a data processing part for processing data by using the detected control information.

Description

Optical disc recording and reproducing apparatus {Recording / reproducing Apparatus of optical disc}

The present invention relates to an apparatus for recording and reproducing high density discs having different formats.

The technology of the recording medium has evolved from the technique of reproducing the data recorded on the disk to the technique of repeatedly recording the data on the disk freely. Recently, various types of rewritable discs have been introduced. Among them, disc tracks are divided into land and grooves (Land / Groove or mountain valleys, hereinafter referred to as land and grooves) in order to increase recording density. There is a method of recording data on or in some of the tracks (for example, DVD-RAM, DVD-R / RW, etc.).

FIG. 1 shows an example of a disc having a land / groove track structure as described above. The track projecting from the pickup (not shown) to the incident side of the light beam is called the groove track 12 and is alternately positioned with the groove track and is incident light beam. The track recessed from is called a land track 13. Therefore, the groove track and the land track have a certain height difference d. In addition, the intervals (TP) between the tracks are different for each disc type and are usually very compact within 1um.

Fig. 2 is an example of a high density disc in which data is recorded in both land and groove tracks, and there is a case where a head area for dividing a sector area in which data is recorded.

Referring to FIG. 2, first, each track is composed of a plurality of sectors which are data areas, and there is a pre-format head area including sector position information and control information between the sectors. . This head area is an area in which data cannot be recorded, and is used to obtain various kinds of information for recording and reproducing, and is generally set in advance by the disc manufacturer.

There are two kinds of head regions as described above. One is a head region 18 (hereinafter referred to as a 'head track region') located between sectors in the same track, and the other is the last sector of a land track. 14) and the head region 19 (hereinafter referred to as 'inter-track head region') between the first sector 15 of the groove track. The system of the optical recorder can determine the track type of the current position from the head area in the track, and know that the track is switched from the head area between the tracks. Servo for the track to be changed is performed.

FIG. 3 illustrates the A and B portions of FIG. 2 in detail. The head region has a first head field 191 and a second head field 192 which are arranged in phase with respect to the track center. Here, the head area switched from the land track to the groove track is detected first at a position where the first head field is higher than the track center, and second at a position lower than the track center.

Fig. 4 is an example of a high density disc, in which data is recorded only on a groove track among land and groove tracks, and is controlled in a pre-pit (LPP) form in a predetermined area of a land track where no data is recorded. If information exists.

Therefore, the light beam is controlled along the groove track, data is recorded only in the groove track and the LPP information provides control information of the data area (e.g., address information of the data area).

However, since a device capable of recording and reproducing all the various high-density discs conventionally provided is not provided, and compatibility between discs is not established, a user needs to separately provide a recording and reproducing apparatus suitable for a specific disc standard. .

Accordingly, an object of the present invention is to provide an optimal integrated system for recording and reproducing discs having different incompatible formats.

It is also an object of the present invention to provide an apparatus capable of recording and reproducing all discs having incompatible different formats in which control information is sequentially provided to a specific area of the disc in addition to the data area.

It is also an object of the present invention to provide an integrated system capable of recording and reproducing both a DVD-RAM standard disc and a DVD-RW standard disc.

1 shows a cross section of a high density optical disc;

2 shows the structure of a particular high density disk;

FIG. 3 is a detailed configuration diagram of the disk shown in FIG.

Figure 4 shows the structure of another high density disk

5 is an overall block diagram of the present invention.

The present invention provides a device for recording and reproducing a plurality of first and second disks having different control information areas for achieving the above object, comprising: a pickup unit for detecting an optical signal from a disk or recording information; And a control unit for controlling recording and reproduction according to the received signal, and reading the data of the first and second discs from the signal detected by the pickup unit, and detecting the control information present in the control information area in the disc. And a signal processing unit for processing data using the detected control information.

In addition, the present invention provides a device for recording and reproducing both a disc that satisfies the DVD-RAM standard and a disc that satisfies the DVD-RW standard, in order to achieve the above object, the control information and data existing in the DVD-RAM and the DVD-RW disc. Using a first semiconductor chip to read a signal and generating a servo error signal, a second semiconductor chip to decode and encode data using the read control information, and a servo error signal generated from the first semiconductor chip. And a third semiconductor chip for performing servo control, and a fourth semiconductor chip for determining the type of disk and controlling the operation of the first, second, and third semiconductor chips.

Hereinafter, a detailed description of the present invention will be described with reference to FIG. 5, but discs of different standards will be described taking the case of DVD-RAM and DVD-RW, respectively.

1) pickup section

The pickup section is provided with amplification means for detecting and amplifying the signal from the PD, which should be able to adjust the gain appropriately during recording and playback. In addition, LD driver should be able to control properly according to recording and reproducing LD, and should be equipped with other necessary elements for control.

2) Signal processing unit

Blocks required by the signal processor differ slightly depending on the configuration of the pickup. This description will be described based on the case of the quad split photo detector (PD) of the conventional astigmatism method. Quad split PD is a well-known PD structure that divides the PD into four and reads signals from each divided area (commonly called A, B, C, and D areas) and uses them to process data and generate various servo control signals. It is to use. Detailed description will be omitted.

2-1) RF Signal Generation Block

This block is a block for generating an RF signal from a signal input from the pickup section, which is somewhat different depending on the configuration of the pickup section. The RF signal consists of the sum of the main PDs. That is, the signal is generally detected as RF = A + B + C + D, and the signal processor may perform the EQ according to the reproduction speed based on these sum signals and generate the PLL as necessary to generate the RF. If the PLL is in the data processing unit, a signal for generating an RF signal may be fed back from the data processing unit. This is commonly called jitter feedback to hang the PLL in the direction where the jitter comes out best when playing. In addition, this RF signal processing block may be composed of a pure analog circuit, but depending on the configuration may include a digital processing unit. After all, this RF signal processing block is to generate the RF signal which is most advantageous to decode the information read from the disk according to the speed.

2-2) DVD-RAM Header Processing Block

DVD-RAM is a Disc standard that has a header and can record and play data in both Land and Groove with ZCLV (Zone Constant linear Velocity). When recording and playing a DVD-RAM disc, as shown in the DVD-RAM standard, a header including address information exists. In order to reproduce this information, the header area needs to be properly processed. That is, in order to play the DVD-RAM in this block, it is necessary to generate a window signal indicating the header section, and if necessary, insert the RF signal in the header region into the RF signal and process it. (In DVD-RAM 1.0, the address information is read from the push pull signal by using the Main RF in 2.0 or higher.) Also, in the header area, the header area of the DVD-RAM can be read by the signal processing unit or the data processing unit. It plays an important role such as generating RF signal, indicating RF signal of header part, signal processing of Servo Error (Servo error hold, Wobble mask, Land Groove switching, header phase changed).

2-3) DVD-R / RW LPP Processing Unit

In case of DVD-R / RW, it is a structure that can record only Groove as a header, like a DVD-RAM, and has a pre-pit structure in a land that is not recorded (LPP). It provides Address accordingly. Since the main push-pull signal is used in the case of the LPP processing block, the LPP data is generated by passing the appropriate signal processing block from the push pull signal and sent to the LPP decoder to process the DVD-R / RW signal.

2-4) Wobble Signal Generator

The Wobble signal generation unit is a block that generates a Wobble signal by constructing an appropriate Band Pass Filter from the Wobble information formed on DVD and CD recording discs. In the case of a CD recording disc, FM information is recorded on the disc by a signal having a center frequency of 22.05 KHz (1x speed). Therefore, an appropriate BPF is needed to detect this wobble signal. In addition, since DVD-RAM is molded at the same frequency of 157KHz (2.6GB), 314KHz (4.7GB), and DVD-R / RW (4.7GB: about 140.6KHz), a reasonable BPF is required. This Wobble signal can be used to control the spindle during recording or to generate the clock used for recording.

2-5) Servo Error Generator and Other Control Signals

The servo error generator detects tracking errors (TE), focus errors (FE), tilt errors, track center errors (TC), etc. from the signals detected by the pickup unit to match the detection characteristics of the pickup unit. Block. For example, in the case of astigmatism, a servo error can be generated as follows from the 4-split PD. FE = (A + C)-(B + D), TE = (A + D)-(B + C), TC varies depending on the pickup configuration, but generally LPF of MPP (Main Push-Pull) signal Ingredients may be used. In addition, the tilt detection means is used to generate an error signal for the tilt control. Other control signals may include defect signal processing and off track signal processing. On the other hand, in the case of CD, a block that generates stable Servo errors during recording and playback should be implemented. That is, it should be equipped with error sample / hold circuit used in current CD recorder.

3) Servo controller

The servo controller configures an appropriate controller for each servo channel by using the servo error and other control signals from the signal processor and the spindle control signals from the data PLL and Wobble from the data processor and the header window signals output in the case of DVD-RAM. By driving the motor and actuator controller (servo drive unit), it is a block that stably reads signals from the pickup unit and performs stable recording even during recording. For example, in case of DVD-RAM, it is possible to hold various Servo errors on the Header part or adjust Servo Gain. Blocks that are particularly driven by this servo controller are Focus, Tracking, Sled, Tilt, and Spindle. In addition, depending on the configuration, it is possible to perform the feedback control to the LD so as to bring the drive of the LD stably. In this system configuration, the LD controller is controlled by the laser power driver.

The servo drive unit actually drives the motor or actuator under the control of the servo controller.

4) Data processing unit

4-1) Decoder Processing Block

This decoder processing block is a block for restoring data recorded on the disk from information input from the signal processing unit. When the PLL processing additional signal processing unit is used, the decoder processing block recovers data from the clocked data and the clock without the PLL block, and then corrects the error correction code. ) And EDC (Error Detection Code) to generate the desired data in the host and buffer it. If there is no PLL in the signal processing section, data PLL is performed and necessary information (for example, Jitter quantity) is fed back to the signal processing section to optimize data reproduction from the RF. In the case of the header of the DVD-RAM, the header decoder which generates the header window decodes the address information contained in the header, and then decodes the playback data to accumulate the data in the buffer. In the case of DVD-R / RW playback, address and valid data are processed through data decoding in the same manner as in DVD-ROM. In the case of actually playing DVD data, the pure decoder processing unit has the same processing method. In the case of CD discs, ECC and EDC methods are different from those in the DVD system. Therefore, data decoding is performed through a decoder block configured for CD. In the case of audio, data processing is performed by outputting digital or analog data streams before performing EDC. Playback is performed through.

4-2) DVD-RAM Header Decoder

In the case of DVD-RAM, this block uses the signal input from the header area and the header window signal from the signal input from the DVD-RAM header processor of the signal processor, the RF signal input to the decoder, and the PLL clock by the Wobble signal. Block for generating RF signal processing control signal and header address. This signal is a physical address recorded on the disk and fed back to the Encoding Block and applied to Data Encoding at the time of recording.

4-3) LPP Processing Block

In the case of DVD-R / RW, this block decodes the LPP data input through the appropriate signal processing in the LPP processing section of the RF signal processing section. Unlike the DVD-RAM header, the input data processing method is different, so the physical data is secured from the disc by decoding as specified in the standard. This physical data is used for data encoding during feedback by feeding back to the encoder block during data encoding.

4-4) Wobble Processing Block

This block inputs the processed Wobble data according to the type of Disc in the signal processor. In case of DVD-RAM and DVD-R / RW, the same frequency is input (DVD-RAM: 157KHz, DVD-R / RW: 140.6KHz, 1x speed) .Wobble PLL is used to control the spindle. It can be used to generate the necessary signal for writing and to create the write channel clock when recording. In case of DVD-RAM, Wobble Data is distorted in the case of Header, so it is necessary to hold it when PLL is applied to this part. Also, in case of DVD-RAM, this Wobble clock can be used to hang Data PLL of Data Decoding Block.

4-5) Encoder Processing Block

Encoder processing block is a block that encodes data received from host according to disc standard. In case of DVD, it adds code for error correction and encodes it, then performs 8to16 Modulation and sends it to Write Pulse generator. In the case of a DVD-RAM, since it should not be recorded in the header area, processing for this part is also performed. On the other hand, in the case of CD, the data transmitted from the host is encoded by adding an error correction code by adding an address processed by the Wobble processing unit. In case of CD, it performs 8to14 modulation and sends it to Write strategy which is Write pulse generator. Write channel clock used for encoding uses fixed clock or write channel clock by Wobble PLL.

4-6) Write strategy processor

This block is mainly used to generate write pulse for LD drive during recording.It generates LD drive pulse according to the write strategy of each recording media such as peak pulse, erase pulse, bias pulse during recording, and adjusts the fine pulse duration or adaptively. Block that generates pulse. It also generates a control signal to adjust the servo error and RF generation gain during recording, and generates this control signal even when a sample / hold of servo error and RF is required, as in the case of CD recording.

4-7) Host I / F Processing Unit

This block is an interface block that receives commands and data from the PC, ie, the host through the IDE bus or the SCSI bus, and allows the system to operate well according to the PC's requirements.

5) Laser Poser Control

This block controls (OPC) the LD to output optimum power when recording from the write pulse and control signal of the encoder, and also performs R-OPC to perform the optimal recording. It also detects abnormal conditions during recording and drives LD types according to disc type. It is a block that performs signal processing to drive LD properly according to disk standard (ie, performs ALPC, OPC, R-OPC).

6) System controller

The system controller manages and controls the components, and organically connects each component to control recording and reproduction, drives a loading motor to control a tray, processes a user's input key, and drives a display device.

The operation of the entire system of the present invention will be described in detail.

The system power supply supplies power to each component required by the system.

The system controller initializes each component to suit the system according to the reset of the controller while power is supplied, and operates according to the F / W implemented in the controller.

Initially, offset of each Servo channel is canceled according to initial reference required for Servo.

And initialize the initialization element performed without input of the RF signal. For example, initialize the factors related to Sled movement, position the objective lens at the initialization position, or perform initial diagnosis of the system.

Then turn on the LD and perform initialization for the LD controller.

Focus search is performed to determine the presence or absence of a disc, and to determine the type of disc and to select the appropriate laser power and focus servo controller according to the type of disc to perform Focus Servo. In the case of disc discrimination, discrimination is performed from a signal input from the pickup section, and the method can be applied in various ways. After disc identification is completed, set each component of the system by changing the initialization value according to the disc identified.

Initialization related to Focus is executed when Focus Servo is executed. At this time, Focus offset, Focus Balance, etc. are performed to ensure stable Focus servo. If the focus servo is unstable due to an error in disc determination, perform the above steps again to verify.

In addition, in the case of the disc determination, it may be performed while rotating a disk motor. When the focus servo is performed, the disk motor should be rotating at the proper speed according to the initial position of the objective lens. In this case, since rotation information about the disc motor cannot be obtained from the disc, control is performed using FG, which is information about the rotation generated by the disc motor itself.

After the focus servo has stabilized, the tracking is initialized. That is, remove the tracking offset, adjust the tracking balance, and adjust the gain to initialize to the requirements required by the servo controller. The Focus servo is on and the Track servo is off. In this case, since the method of generating track error differs depending on the type of disk, the method depends on the creation method. For example, the main beam push-pull in the case of a DVD-RAM, the DPD method in the case of a DVD-ROM, and the like. In addition, the generation method may vary depending on the configuration method of the pickup unit.

After the focus servo and tracking servo have stabilized, control the spindle servo to stabilize the desired speed. At this time, use spindle control information from disk or control information by FG. The control information input from the disc is controlled by using the signals detected according to data decoding in the case of CD system, DVD-ROM / R / RW, and generated from the Wobble signal in case of DVD-RAM and unrecorded DVD-R / RW. Can be.

When the initial servo factor is stable, the control factors for the tilt are initialized and controlled while following the normal servo, or track.

After the initial servo is stabilized, the unique information of the disk is extracted from the lead in area and the disc type identification is verified to stabilize the control factors of all components based on the correct disk information.

The information transmitted from the host during the initialization or subsequent processing is processed in the host I / F block of the data processing unit to inform the controller and perform necessary processing. Necessary processing is to Seek to play the data or to transfer the information read from the disk to the Host or to the Encoder Block. Otherwise, system information is fed back or set as required.

The System Controller also takes care of outbreaks that occur while playing or writing to a disc, and forwards it to the host as needed.

The System Controller also manages the proper display of response or LED indicators for external keys or other inputs to ensure the system performs well. Also, depending on the state of the system, the power is switched to the sleep mode or the active mode, and it operates in response to the interruption of the host or user. For example, when a user requests a disk to be replaced, the tray may be opened to replace the disk, and the replaced disk may be repeated to play data or to record data from the disk by repeating some of the above steps.

In the actual construction of the present invention, each component may be composed of a semiconductor chip, and in this case, it is desirable to design related integrated functions into one semiconductor chip in order to record and play both DVD-RAM and DVD-RW. . Therefore, the signal processor is configured as a first semiconductor chip, the data processor is a second semiconductor chip, the servo controller is a third semiconductor chip, and a system contriller having a microcomputer function is configured as a fourth semiconductor chip.

As described above, the optical disc recording / reproducing apparatus according to the present invention can provide convenient use by providing an optimal integrated system capable of recording and reproducing all of discs having different standards.

Claims (2)

An apparatus for recording and reproducing a plurality of first and second disks having different control information areas, A pickup unit for detecting an optical signal from the disk or recording information; A control section for discriminating a disc type from the signal detected by the pickup section and controlling recording and reproducing accordingly; A signal processing section for reading data of the first and second disks from the signal detected by the pickup section and detecting control information existing in the control information area in the disk; And a data processing unit for processing data by using the detected control information. In the apparatus for recording and reproducing both a disc that satisfies the DVD-RAM standard and a disc that satisfies the DVD-RW standard, A first semiconductor chip for reading control information and data present in the DVD-RAM and the DVD-RW disc and generating a servo error signal; A second semiconductor chip which decodes and encodes data using the read control information; A third semiconductor chip performing servo control by using the servo error signal generated from the first semiconductor chip; And a fourth semiconductor chip for discriminating the type of disk and controlling the operation of the first, second, and third semiconductor chips.