KR100253733B1 - Method for recording data of dvdr system - Google Patents

Abstract

PURPOSE: A recording method for data of DVDR(Digital Video Disk Recorder) system is provided to prevent reproduced data from being cut in moving an optical pickup from a grove to a land. CONSTITUTION: By input of a recording key signal from a key input unit, a DVDR system is converted into a groove recording mode. A start point for a program area of a groove is detected by controlling an optical pickup unit. Herein, the optical pickup unit is transferred to an innermost location of the program area. Then, program data are successively recorded from inner portion toward outer portion of the program area of the groove on a disk. Herein, a system control unit detects a track location information for storing in a memory of the system control unit. In case of an outermost point of the program area of the groove, a track ending data for the groove is stored in the memory. The system is converted into a land recording mode. Herein, the program data are recorded from the outer portion toward the inner portion of the program area. Herein, the optical pickup unit is transferred to the outermost portion of the program area for detecting a starting point. Then, the system control unit records the program data on the disk.

Description

Data recording method of DVD system {METHOD FOR RECORDING DATA OF DVDR SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method in a digital video disc recorder (DVDR) system, and more particularly to a data recording method of a DVD system suitable for recording data in both a land and a groove.

In general, optical discs are read-only type that allows users to play information only, such as CDs, CD-ROMs, and video discs. Depending on their functions and uses, optical discs can be recorded once and then recorded several times, but can be erased and rewritten. It can be divided into an additional recording type without recording and an erasing rewriting type that can repeatedly record, erase and reproduce information.

Here, the DVDR disc is one of the above-described erasing rewritable discs. Two recording methods have been proposed, one of which is magneto-optical and the other is phase-change.

The magneto-optical type instantaneously heats the one-way magnetized magnetic thin film surface to near the Curie temperature, thereby reversing the magnetization direction of the heated micro part, recording data, and reading and reproducing information according to the magnetization direction at the time of reproduction. The phase change type is a method of recording by using a crystalline / amorphous reversible change in the process of heating and cooling a micro part of a medium using a laser, and reading and reproducing information by reflecting the difference in reflectance between two phases during reproduction. .

1 is a structure of a general DVDR disc, in which a track in which a program is recorded is composed of grooves 10 and lands 20, and an absolute address indicating a predetermined position on the track is FM (Frequency Modulation) modulation. And recorded as a wobble 30. Here, the wobble 30 is used as a reference signal for rotating the disk at a constant linear speed when recording a program on the disk.

In this case, a conventional disk is divided into a read-in area, a program area, and a read-out area. In the lead-in area, a table of contents of each program in the program area is shown in a table. TOC (Table Of Content) information is stored, and information related to program termination recorded on the disc is stored in the lead-out area. Similarly, a DVDR disc is divided into a lead-in area, a program area, and a lead-out area. Normally, program data is recorded in the direction from the innermost circumference to the outermost circumference of the disc.

On the other hand, in the conventional method, data is recorded in such a manner that program data is recorded from the innermost circumference to the outermost circumference of the program area in the groove, and then the program data is recorded from the innermost to the outermost circumference of the program area in the land. Therefore, the program data recorded on the disc in this manner is reproduced in the outermost direction from the innermost circumference of the program area in the groove, and then reproduced in the outermost direction from the innermost circumference of the program area in the land.

That is, in the conventional method, when the reading of the program data in the groove is completed through the optical pickup, the optical pickup is moved to the start point of the program region in the land to read the program data in the land.

However, in the case of reproducing program data sequentially recorded from the innermost circumference to the outermost circumference of the groove and land according to the conventional method described above, the optical pickup should be moved to the start point of the program area in the land after completing the data reproduction in the groove. Therefore, there is a problem that a section (time without a playback signal) in which a signal is momentarily disconnected occurs at the moment of movement. In particular, when playing a disc on which a moving picture is recorded, a momentary signal dropping phenomenon causes a significant deterioration in service quality.

Accordingly, the present invention is to solve the above problems of the prior art, by recording program data in the groove in the direction of the outer peripheral portion of the disk, and recording the program data in the direction of the inner peripheral portion of the disk in the land, It is an object of the present invention to provide a data recording method of a DVD system capable of preventing the reproduction of data from being interrupted.

In order to achieve the above object, the present invention provides a recording key signal in a method for recording data using a DVDR system capable of recording input program data from the outside on an optical disc having a plurality of grooves and land tracks. Change the system to the groove recording mode, record the input program data from the innermost peripheral start point of the program region in the groove to the outermost peripheral direction, and track-related position information of the in-groove program region generated during the recording operation. A first step of temporarily storing them; When the end point of the program area in the groove is detected, the groove recording mode is paused, the system is switched to the land recording mode, and the input program data is moved from the outermost peripheral start point of the program area in the land toward the innermost peripheral direction. A second step of recording and temporarily storing track-related position information of an in-land program area occurring during the recording operation; A third step of, when the recording of the program area of the land is completed, recording the end related information of the program recorded in the groove and the land into a lead-out area allocated to the innermost peripheral side of the land; And when the recording of the information on the lead-out area is completed, the system is switched to the groove recording mode, and the track-related position information of each program area in the groove and land stored temporarily is extracted and made into a TOC, and then the innermost periphery of the groove. A data recording method of a DVDR system comprising a fourth step of recording in a lead-in area allocated to the side.

1 is a structural diagram of a general DVDR disc;

2 is a structural diagram of a disc shown to explain that the lead-in area and the lead-out area are respectively assigned to the innermost part of the groove and the innermost part of the land according to the present invention;

3 is a block diagram of an exemplary DVDR recording apparatus suitable for carrying out the data recording method according to the present invention;

4 is a flowchart illustrating a process of writing data on a DVD disk according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

100: disc 110: MPEG encoder

120: data format unit 130: optical pickup unit

140: absolute address detection unit 150: servo unit

160: spindle servo and drive unit 170: system control unit

180: key input unit

First, a key technical aspect of the present invention is to record program data from the inner circumference to the outer circumferential direction in the program area of the groove, and to record the program data from the outer circumference to the inner circumferential direction in the program area of the groove. The object of the present invention can be easily achieved by minimizing the transfer distance and time for moving the optical pickup to the starting point of the land program data after completion of data reading in the groove.

FIG. 2 is a structural diagram of a disc for explaining that the lead-in area is allocated to the innermost periphery of the groove and the lead-out area is allocated to the innermost periphery of the land according to the present invention. The table of contents information (e.g., a track number, a start point and an end point on a track containing a predetermined program, etc.) is recorded, and information related to the end of the program is recorded in the lead-out area 20A.

In addition, assuming that the left side is the inner circumferential portion of the disk and the right side is the outer circumferential portion, program data is recorded in the program region 10B from the inner circumference to the outer circumferential direction, and program data is recorded in the program region 20B from the outer circumference to the inner circumferential direction. do.

3 is a block diagram of a typical DVDR recording apparatus suitable for carrying out the data recording method according to the present invention.

Referring to FIG. 3, the MPEG encoder 110 compresses program data input from the outside for recording to the disc 100 according to an MPEG compression scheme well known in the art, converts the program data into a data stream, and outputs the converted data stream. The data formatter 120 subdivides the data stream provided from the MPEG encoder 110 into sectors according to control from the system controller 170, adds a sector header to each sector, and reads the data stream. After performing reed-solomon error correction coding, EFM plus modulation is output.

In addition, the optical pickup unit 130 records data provided from the data format unit 120 on the disk 100 based on the control from the servo unit 150, and wobbles of a constant frequency from the disk 100. Signal is detected, the absolute address detecting unit 140 detects the absolute address on the disc 100 from the wobble signal provided from the optical pickup unit 130, and the servo unit 150 controls the control from the system control unit 170. And tracking and feed servos, and the spindle servo and the driver 160 move the disk 100 to the CLV (Constant Liner) based on the absolute address signal provided from the absolute address detector 140. Velocity)

On the other hand, the system controller 170 controls the overall recording operation of the program data input from the outside and the reproduction operation of the program data recorded on the disc in response to the user operation key signal provided from the key input unit 180, The key input unit 180 generates various key signals (eg, a recording key signal, a reproduction key signal, a stop key signal, etc.) necessary for controlling the operation of the DVDR system, and transmits them to the system controller 170.

Next, a process of recording data on the disc according to the present invention using the DVDR system having the above-described configuration will be described.

4 is a flowchart illustrating a process of recording data on a DVD disk according to a preferred embodiment of the present invention.

Referring to FIG. 4, when a recording key signal is input from the key input unit 180 while performing the standby mode in a state in which the disc 100 is mounted in the DVDR system (S1), the system controller 170 records the DVDR system. After switching to the mode, that is, the groove recording mode (S2), the optical pickup unit 130 is controlled to search for the start position of the program area 10B of the groove 10 (S3). At this time, the servo unit 150 moves the optical pickup unit 130 to the point closest to the innermost periphery of the program region 10B of the groove 10 under the control of the system controller 170.

Next, when the optical pickup unit 130 moves to the point closest to the innermost periphery of the program area 10B of the groove 10 by the beam unit 130, and the search is completed (S4), the system controller 170 The program data input from the outside is controlled to be recorded in the direction from the inner circumference to the outer circumference in the program area of the groove 10 in the disc 100. That is, the program data compressed through the MPEG encoder 110 and converted into a data stream, and the EFM plus modulated data through the data format unit 120, is stored in the groove 10 of the disc 100 through the optical pickup unit 130. The program is written sequentially from the inner circumference of the program area 10B to the outer circumference (S5).

More specifically, in the DVDR disc 100, an absolute address for determining a predetermined position on the disc is recorded as an FM signal by wobbling, and the absolute address detection unit 140 is an optical pickup unit during the recording operation of the DVDR system. The absolute address is detected from the wobbling signal output from the 130 and provided to the system controller 170, the spindle servo, and the driver 160, respectively, and the system controller 170 is provided from the absolute address detector 140. The current recording position on the disc 100 is determined by referring to the address signal. In addition, the spindle servo and driver 160 rotates the disk 100 to CLV based on the absolute address signal provided from the absolute address detector 140.

In addition, the servo unit 150 programs the program area in the groove 10 of the disc 100 based on the tracking error signal and the focusing error signal corresponding to the tracking error and the focusing error generated when the program is recorded on the disc 100. The optical pickup unit 130 is servo-controlled so as to be accurately recorded in the.

That is, the program data is sequentially recorded in the program area in the groove 10 from the inner circumference to the outer circumference through the above-described process. During the recording operation, the system control unit 170 controls the track. The location information is detected and stored in a memory inside the system controller 170 (S6). Here, the track-related position information includes position information necessary for random access to a reproduction path and a predetermined track position at the time of reproduction. In addition, the system controller 170 refers to the absolute address provided from the absolute address detection unit 140 while the groove recording mode is being performed, and a point where the current recording position is closest to the outermost peripheral portion of the program area 10B of the groove 10. A determination is made as to whether or not is reached, that is, it is checked whether or not the end point of the program area in the groove 10 has been reached (S7).

As a result of the check in the step S7, when it is determined that the current recording position has reached the point closest to the outermost periphery of the program area 10B of the groove 10, the current position corresponds to the end point of the predetermined track. After storing the track end data for the corresponding groove 10 in the internal memory, the recording operation is paused (S8).

Next, the system control unit 170 switches the system to the land recording mode so that a program input from the outside is recorded in the land 20 (S9).

Thus, by controlling the optical pickup unit 130 in the same manner as in the groove recording mode, program data is recorded in the program area of the land from the outer circumference to the inner circumference, where the tracking error signal and the wobble for absolute address detection are detected. The polarity of the signal is reversed, and the offset value of the focusing error signal is readjusted to fit the land 20. The spindle servo and drive unit 160 also controls the disk 100 to rotate in a direction opposite to the previous rotation direction (that is, the rotation direction in the groove recording mode).

That is, in the land recording mode, unlike the groove recording mode in which the program data is recorded from the inner circumference of the program area in the groove 10 to the outer circumferential direction, the program data is moved from the outer circumference of the program area in the land 20 to the inner circumferential direction. Is recorded. At this time, since the optical pickup is located at the outermost periphery of the groove, only one pitch needs to be moved.

More specifically, the system control unit 170 controls the system to search for a start position of the program area 20B of the land 20 (S10), so that the servo unit 150 of the system control unit 170 By control, the optical pickup unit 130 is moved to the point closest to the outermost periphery of the program area 20B of the land 20 to search for a starting point (S11).

In the step S11, the starting point for recording the program data is searched, that is, the optical pickup unit 130 is moved by the servo unit 150 to the point closest to the outermost periphery of the program area 20B of the land 20. If so, the system controller 170 controls the program data input from the outside to be recorded on the disk 100.

As a result, program data input from the outside is provided to the optical pickup unit 130 via the MPEG encoder 110 and the data format unit 120. The optical pickup unit 130 is controlled by the system controller 170. Program data provided from the data format section 120 is recorded in the program area in the land 20 of the disc 100, i.e., from the point closest to the outermost periphery of the program area 20B of the land 20. It records sequentially in the housewife direction (S12).

In addition, the system controller 170 detects and stores track-related position information in the internal memory in the same manner as in the groove recording mode described above (S13), and refers to the absolute address provided from the absolute address detector 140 at present. It is determined whether the recording position has reached the point closest to the innermost periphery of the program area 20B of the land 20, and it is checked whether or not the end point of the program area in the land 20 has been reached (S14).

If it is determined in the step S14 that the current recording position has reached the point closest to the innermost periphery of the program area 20B of the land 20, the current position corresponds to the end point of the predetermined track. After storing track end data for the corresponding land 20 in the internal memory, the write operation is stopped (S15).

Next, the system controller 170 controls the servo unit 150 to search for the lead-out area 20A at the innermost periphery of the land 20 (S16), and the servo unit 150 controls the system controller ( The optical pickup unit 130 is moved to the start point of the lead-out area 20A of the land 20 by the control of 170, and the optical pickup unit 130 reaches the lead-out area 20A of the land 20. The lower surface S17 and the system controller 170 provide the data formatter 120 with information related to the end of the program recorded in the grooves 10 and the program areas 10B and 20B of the land 20.

Therefore, the information related to the end of the program recorded in the groove 10 and the land 20 is read in the land 20 of the disc 100 through the optical pickup unit 130 after passing through the data format unit 120. It is recorded in the out area 20A (S18).

Subsequently, the system control unit 170 checks whether or not the recording of the end related information for the lead-out area 20A in the land 20 has been completed (S19). Here, the check result information recording is completed. If it is determined, the system controller 170 switches the system to the groove recording mode (S20). Accordingly, the polarity of the tracking error signal of the servo unit 150 detected to perform tracking servo for the optical pickup unit 130 and the wobble signal for absolute address detection are inverted again, and the offset value of the focusing error signal is reversed. It is readjusted for this groove 10. In addition, the spindle servo and drive unit 160 controls the disk 100 to rotate in a direction opposite to the previous rotation direction.

When such a process is completed, the system controller 170 creates position information of various tracks stored while recording a predetermined program in the program areas 10A and 20B of the groove 10 and the land 20 in the TOC (S21). The servo unit 150 is controlled to search for the lead-in area 10A in the groove 10 (S22). The servo unit 150 moves the optical pickup unit 130 to the start point of the lead-in area 10A at the innermost periphery of the groove 10 under the control of the system controller 170. When the optical pickup unit 130 reaches the lead-in area 10A in the groove 10 (S23), the TOC information is provided to the data format unit 120.

Therefore, the TOC information is recorded in the lead-in area 10A in the groove 10 of the disc 100 by the optical pickup unit 130 after passing through the data format unit 120 (S24). After TOC information is recorded in the lead-in area 10A in the groove 10 (S25), the system controller 170 stops the recording mode operation of the system (S26).

That is, the program data is recorded in the program area in the groove from the innermost part to the outer circumferential direction in the groove, and the program data is recorded in the program area from the outermost part in the inner circumferential direction to the program area in the groove, and the innermost part of the land is recorded. The program end related information is recorded in the lead-out area in the terminal and the TOC information is recorded in the lead-in area in the innermost periphery of the groove, thereby completing the recording of any program data selected by the user on the disc.

Therefore, according to the present invention, since the groove records the program data from the inner circumference to the outer circumference and the land records the program data from the outer circumference to the inner circumferential direction. The track tracking of the optical pickup is in the order of the groove innermost part → groove outermost part → land outermost part → land innermost part. Therefore, in the case of recording the program data on the disc according to the present invention, the transfer distance and the transfer time for moving the optical pickup when moving from reading data in the groove to reading data in the land can be made very short.

As described above, according to the present invention, unlike the conventional method of sequentially recording program data from the innermost circumference to the outer circumferential direction for each of the groove and the land, program data is recorded in the groove from the innermost circumference to the outer circumferential direction. By recording the program data from the outermost circumference to the inner circumferential direction, it is possible to suppress the disconnection of the reproduction data generated at the moment when the optical pickup moves from the groove to the land during the reading of the program data in the reproduction mode.

Claims (1)

A method of recording data using a DVDR system capable of recording external input program data on an optical disc having a plurality of grooves and land tracks, the method comprising: When a recording key signal is provided, the system is switched to the groove recording mode, the input program data is recorded from the innermost peripheral start point of the program area in the groove to the outermost peripheral direction, and the in-groove program area generated during the recording operation. A first step of temporarily storing track-related location information of the track; When the end point of the program area in the groove is detected, the groove recording mode is paused, the system is switched to the land recording mode, and the input program data is moved from the outermost peripheral start point of the program area in the land toward the innermost peripheral direction. A second step of recording and temporarily storing track-related position information of an in-land program area occurring during the recording operation; A third step of, when the recording of the program area of the land is completed, recording the end related information of the program recorded in the groove and the land into a lead-out area allocated to the innermost peripheral side of the land; And When the recording of the information about the lead-out area is completed, the system is switched to the groove recording mode, the track-related position information of each program area in the groove and land temporarily stored is taken out and made into a TOC, and then the innermost peripheral side of the groove is obtained. And a fourth step of recording in the lead-in area assigned to the data recording method of the DVDR system.

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