KR100288938B1 - Method for searching start position of data - Google Patents

Abstract

PURPOSE: A data starting position searching method is provided to reproduce data by reading starting position information and ending position information of data in a read-in or read-out area when a large scratch is generated in a VMGI data area. CONSTITUTION: A method for searching a data starting position includes the steps of moving a pickup to a read-in area if video maintenance information of a disc was not read(113), reading data starting position and data ending position recorded in the read-in area(115,117), moving the pickup to the data starting position(119), and moving the pickup to a read-out area if the data starting position and the data ending position were not read in the read-in area.

Description

Data start position search method

The present invention relates to a data start position search method, and more particularly, data capable of reproducing data by using start position information / end position information of data recorded in a lead-in area when data management information is damaged. The starting position search method.

Examples of the recording medium used so far include paper, tape, compact disc (hereinafter referred to as CD), laser disc (LD), and the like. Digital video discs (hereinafter referred to as DVDs) have emerged as a demand for a recording medium capable of storing a larger amount of data. The DVD has been configured to store enough of an existing movie (130 minutes of video playback), and is expected to be used in video / audio and computer fields, and is emerging as a next-generation recording medium.

In addition, DVDs are directly related to the field of video as much as they are actually called video recording media. So DVD has enough storage capacity for one movie and has the following system specifications.

First, it is possible to set up a selection menu screen by recording up to 9 angle screens for one image, second up to 8 audios, third 32 language subtitles, and fourth multiple programs. Permanent lock function to block children. In addition, since a DVD is much larger than a conventional recording medium in a storage capacity, a plurality of programs can be stored.

Therefore, in the DVD playback operation, it is necessary to selectively play data recorded on the DVD rather than sequential playback for the reasons described above.

The following describes in detail the reproduction process of a DVD having the above system specification with reference to the configuration of a conventional general optical disc reproducing apparatus.

1 is a block diagram showing a conventional general optical disc reproducing apparatus.

The optical disc reproducing apparatus reads out data recorded on a DVD 1 storing data according to various system specifications, a rotation drive motor 25 of the DVD 1, and a data recording surface of the DVD 1; An optical pickup device 3 for converting and outputting an electrical signal and a high frequency signal processor 29 for inputting a reproduction high frequency signal output from the optical pickup device 3 and performing signal processing such as amplification and phase adjustment. ).

The optical disc reproducing apparatus controls the driving of the motor 25 and the servo unit 7 which controls the tracking and focusing of the optical pickup apparatus 3 by using the signal detected from the high frequency signal processing unit 29; It includes a microprocessor unit 9 that manages the system as a whole, and a key input unit 11 into which an external signal is input.

Further, the optical disc reproducing apparatus inputs the reproduction frequency signal processed by the high frequency signal processor 29 under the control of the microprocessor unit 9, and performs a digital signal processing such as error correction. It includes. A video decoding circuit 13 which inputs, decodes and outputs only video data among digital signals output from the digital signal processor 5, and is output from the digital signal processor 5 under the control of the microprocessor unit 9; A graphics circuit 15 for inputting only subtitle data from a reproduction signal, signal processing the same, and outputting the audio signal from the reproduction signal output from the digital signal processor 5 under the control of the microprocessor unit 9 An audio decoding circuit 17 for outputting is included.

The video signal output from the video decoding circuit 13 is converted into an analog signal by the video digital / analog converter 19, and then converted into a broadcast signal according to the NTSC / PAL standard by the NTSC / PAL encoder 23 and output. do. The audio signal output from the audio decoding circuit 21 is also converted into an analog signal by the audio digital / analog converter 21 and then output.

On the other hand, the DVD 1 is a parental system that can block up to 9 angle screens, up to 8 audios, 32 untitled subtitles, a plurality of programs, and obscene images for one image from a child. Stores data according to a lock function.

These data are stored separately according to the data structure format of the DVD, and the data structure unit of the DVD is shown in FIG.

The DVD 1 is divided into a data record area, a lead-in and a lead-out area, in which the reproduction data and management information necessary for reproduction of the data are recorded. In the lead-in and lead-out areas, only the start position information and the end position information of the reproduction data are recorded many times.

Data stored in the data record area is stored in sector units, and in the reproducing operation, when one sector is reproduced, data recorded in the next sector desired by the user is reproduced. A plurality of these sectors may be gathered to form a video title VTS or a program PG. That is, the basic unit of data storage of the DVD is made up of sectors, like the CD, and each data structure unit of the DVD is made up of VOBUs consisting of one or more sectors.

Title (TITLE; VTS) is the largest unit of data structure in a DVD. Therefore, one DVD may be composed of one title (VTS) or may be composed of a plurality of titles.

The DVD may include a program change (PGC) in the largest unit as the unit included in the title, and the program (PROGRAM (PG)) in the largest unit as the unit included in the program change. In addition, a cell (CELL) is included in the program, and the cell includes a video object unit (hereinafter referred to as VOBU).

In order to play only the desired data on the DVD divided into several unit units, it is necessary to find the start address of the unit in which the data to be played is stored. This start address is included in the system management information stored in the video manager (VMGI). .

In other words, the DVD has a variety of data structure units, and the DVD has various system features described above. Therefore, during the DVD playback operation, the DVD playback apparatus searches and reads only the data desired by the user, and performs seamless play of continuously playing the data.

When performing the seamless play, only the desired data should be reproduced from the data stored on the DVD, and for this reproduction operation, a search operation for moving the pickup device 3 which reads the data to the place where the desired data is recorded. Will be performed. The search operation of the pickup device 3 recognizes the positional information on which desired data is recorded from the video manager information VMGI recorded on the DVD 1 under the control of the microprocessor unit 9, and then searches for the position. Will be performed.

Looking at this operation in more detail, the DVD 1 is rotated by the driving of the motor 25. The microprocessor 9 controls the servo unit 7 to move the optical pickup device 3 to the place where the VMGI data is located. Thereafter, the data read by the optical pickup device 3 is converted into an electrical signal, and then decoded by the microprocessor unit 9, whereby the position of the data to be reproduced thereafter is found from the decoded VMGI data.

In other words, the microprocessor unit 9 must find the desired data from the various structural units of the DVD 1. In other words, when the user plays one title VTS among a plurality of programs stored in one DVD, the program change PGC included in the title is first found, and the program PG included in the program change is found. To find a cell, to find a cell, to find a VOBU, and to play a sector included in the VOBU. The microprocessor unit 9 detects the start address of the VOBU from the VMGI.

The microprocessor unit 9 applies a control signal according to the detected position signal to the servo unit 7, and the servo unit 7 controls the movement of the track of the optical pickup device 3.

In this process, the optical pickup device 3 is located on the track where the VOBU desired to be reproduced by the user is located, and the data read thereafter is subjected to a predetermined signal processing by the high frequency signal processing unit 29, and then the digital signal processing unit 5. ) Is converted into a digital signal and transmitted to each decoding circuit.

At this time, the microprocessor unit 9 determines what data is currently input from the VMGI data to control data input to the corresponding decoding circuit, and the data input to each decoding circuit is subjected to decompression and signal processing. The output is then converted into an analog signal.

That is, when the reproduction process of one VOBU is completed by the above process, the microprocessor unit 9 searches for the position of the VOBU for the next reproduction, and controls the movement of the track of the optical pickup device 3 to the searched position. .

Therefore, the data desired by the user is reproduced through various processes as described above, and the reproducing operation is performed from the search operation of the data first. That is, when the start position of the desired data is detected, the track movement of the optical pickup device 3 is made to the start position, and then the data reproducing operation is performed.

In this way, the playback apparatus for reproducing a DVD not only has a capacity for storing a plurality of programs in a part of the data storage amount of a DVD, but also prior to the reproduction of data by a part of a system specification or the like. The search operation must be performed from the search operation, and the search operation is performed only after the recognition of the VMGI data in the microprocessor unit 9 is made.

Therefore, in the conventional optical disc reproducing apparatus, when a large scratch exists in the portion of the disc on which the VMGI data is recorded or the search of the VMGI information from the optical pickup apparatus 3 is impossible due to defect or the like, the disc is not reproduced. This is because the conventional optical disc reproducing apparatus is configured to perform disc reproduction based on VMGI information as management information for disc reproduction. Therefore, if the management information for the management of the data recorded on the disk is not recognized at all by the system, the user cannot obtain the desired data from the disk even when there is no problem with the playback data, and the disk cannot be used. This occurred.

It is therefore an object of the present invention to provide a data start position search method capable of playing a disc by video management information.

It is another object of the present invention to provide a data start position search method which can play a disc by the start position information and the end position information of data recorded in the lead-in area.

It is still another object of the present invention to provide a data start position search method which enables playback of a disc by the start position and end position information of data recorded in the lead-out area.

1 is a block diagram showing a general disc player.

2 is a data structure diagram of a general digital video disc.

3 is an operational flowchart for searching for a data start position according to the present invention.

* Explanation of symbols for main parts of the drawings

1: disc 3: optical pickup device

5: digital signal processing unit 7: servo unit

9 microprocessor unit 11 key input unit

19,21: Digital / Analog Converter 15: Graphics Circuit

17: audio decoding circuit 13: video decoding circuit

23: NTSC / PAL encoder 25: motor

29: high frequency signal processing unit

A data starting position search method according to the present invention for achieving the above object comprises the steps of: moving the pickup device to the lead-in area; Reading out the data start position information and the end position information recorded in the lead-in area; and moving the pickup apparatus to the data start position to reproduce the data in the order recorded on the disc.

The data start position search method of the present invention first attempts to reproduce data by the video management information, and when the video management information cannot be searched from the optical pickup apparatus, the start position information and the end position information of the playback data in the lead-in area. The reproduction of data is performed based on the above.

In the data start position search method of the present invention, when the start position information and the end position information of the playback data recorded in the lead-in area cannot be searched, based on the start position information and the end position information of the playback data recorded in the lead-out area. Characterized in that data reproduction is performed.

Therefore, in the data start position search method of the present invention, when the video manager is unable to read the disc management information because there is a scratch or the like in the recorded area, the data manager reproduces the data based on the start position information of the playback data recorded in the other area. By doing so, there is an effect of further increasing the use efficiency of the disk.

DETAILED DESCRIPTION Hereinafter, a data start position search method according to the present invention will be described in detail with reference to the accompanying drawings.

3 is an operation flowchart for reproducing a disc by searching for a start position of data according to the present invention. The configuration of the disc reproducing apparatus required in the description of the present invention will be described with reference to FIG. 1, and the configuration of data recorded on the DVD will be described with reference to FIG.

The microprocessor unit 9 controls the servo unit 7 to move the optical pickup device 3 to the beginning of the data record area of the disc 1 when the reproduction signal of the disc is input from the key input unit 11. (Step 101) At the beginning of the data record area, VMGI data, which is video manager data, is recorded as shown in FIG.

Thereafter, the optical pickup apparatus 3 reads the VMGI data from the disk 1 (step 103), and the read VMGI data is converted into an electrical signal and then converted into an electrical signal to a size capable of signal processing by the high frequency signal processor 29. Signal compensation is made and output (step 105).

At this time, since the start information of each VTS and the start information of PGC, PG, CELL, and VOBU included in each VTS are recorded in the read VMGI data, the microprocessor unit 9 reads from the optical pickup device 3. The VMGI data is stored in the data storage means such as its own memory and used to search for the location of the data desired by the user.

That is, the microprocessor unit 9 recognizes the start position of the VTS desired by the user in accordance with the VMGI data, and controls the movement of the optical pickup apparatus 3 to the position. Subsequently, control is performed based on the VMGI data so that reproduction of data to be read thereafter can be normally performed (step 107).

Therefore, the disc is reproduced in step 107, which is performed when reading of the VMGI data is normally performed in step 105, and is the same as the conventional disc playback process. At this time, the disc playback is performed based on the read VMGI data, so that only the necessary data is searched and read according to the system specification or the title desired by the user, and seamless play is performed for continuous playback.

However, when the VMGI data cannot be read in step 105, the microprocessor unit 9 repeatedly moves the optical pickup apparatus 3 to the position of the VMGI data to read the data several times (S109). Step 111). The process by this step is because there is a case where there is no data to be read from the optical pickup device 3 by wrong control of the servo unit 7 even if there is no problem in the portion where the VMGI data is recorded.

When the reading of the VMGl data is impossible even after the operation for searching the VMGI data from the optical pickup device 3 is repeatedly performed by a predetermined amount, the microprocessor unit 9 gives up reading of the VMGl data. This is usually the case when the data recorded on the disk is damaged due to large scratches or defects in the area where the VMGI data is recorded.

Therefore, another method is attempted to play the disc. At this time, the attempted method is to read data start position information and end position information recorded in the lead-in area of the disc. The microprocessor unit 9 issues a command to the servo unit 7 to move the optical pickup device 3 to the lead-in area of the disk 1. The servo unit 7 moves the optical pickup device 3 to the lead-in area of the disc 1 according to the input command (step 113).

The optical pickup apparatus 3 moved to the lead-in area of the disc 1 in step 113 reads out start position information and end position information of data recorded in the lead-in area (step 115).

The start position information and the end position information of the data read out from the optical pickup device 3 in step 115 are input to the microprocessor unit 9 through the high frequency signal processor 29. The input location information is recognized (step 117). At this time, the start position information and end position information of the recognized data are the next position of the VMGI data and the end position of the data recording region in the data recording region shown in FIG. In other words, the start position of the first video title (VTS #J) is the start position information of the data, and the end position of the last video title (VTS #K) is the end position information of the data.

After the start position information and the end position information of the data recorded in the lead-in area in step 117 are recognized, the microprocessor unit 9 controls the reproduction of the disc based on the start position information of the data. That is, the optical pickup device 3 is moved to the start position of the data read in step 115 (step 119), and then the control until the data read out from the optical pickup device 3 is reproduced on the display. (Steps 121 and 123). The data reproduction in the step 123 is performed up to the end position information of the data read in the step 115.

Therefore, since data reproduction in this case is performed without knowing the VMGI data, which is video management information, the seamless playback of only data desired by the user is not normally performed, but the recorded data is sequentially reproduced. . For example, when one or more programs are stored on the disc, and the stored program stores data for nine angle screens, the data playback is in a format in which all angle screens are played in the stored order. Is not played back in the order of progress of each program, but is played back in the stored order.

However, in the case of a disc that stores video data such as a general movie, the amount of data occupied by one movie is about the same as the amount of data that can be stored on the disc in about 120 minutes. You can get it.

That is, in the present invention, when the method of controlling the reproduction of the disc based on the VMGI data is impossible, the data recorded on the disc is reproduced based on the data start position information and the end position information recorded in the risk lead-in area.

In addition, as another embodiment of the present invention, when the start position information and the end position information of the data recorded in the lead-in area cannot be read after the steps 113 to 115, the microprocessor unit 9 performs Control is performed to read data start position information and end position information of the lead out area located at the edge. The data read control process of the lead-out area is the same as the data read control process of the lead-in area described above, and thus a detailed description thereof will be omitted.

In other words, the present invention controls reproduction of the disc by data start position information and end position information recorded in the lead-in area or lead-out area. In this way, when the reading of the VMGl data recorded in the data recording area is not possible due to scratching, the disc can be reproduced by the lead-in area or the lead-out area. This is because the and end position information are repeatedly stored several times. Therefore, the present invention can provide a higher reliability to the consumer because the scratch can affect only a part of the lead-in area so that only one piece of information about the data start position can be read out from the stored data.

As described above, the data start position search method according to the present invention reads the start position information and the end position information of the data of the lead-in area or the lead-out area when a large scratch occurs in the VMGI data area due to user's carelessness. By enabling the regeneration of the product can increase the reliability of the product produced.

Claims (4)

Moving the pickup device to a lead-in area; Reading data start position information and end position information recorded in the lead-in area; And moving the pickup device to the data start position to play the data in the order recorded on the disc. The method of claim 1, wherein the moving of the pickup device to the lead-in area is performed when reading of the disc's video management information fails. The start of the data recorded in the lead-out area according to claim 1, further comprising the step of moving the pickup device to the lead-out area when the start and end position information of the data cannot be read in the lead-in area. A data start position search method comprising reading position and end position information. Reading video management information; Performing seamless playback of a disc by the video management information; Reading data start position information and end position information recorded in a lead-in area when the video management information is not read; And moving the pickup device to the data start position to play the data in the order recorded on the disc.

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