KR20080069316A - Control method of buffer in optical disc driver - Google Patents

Abstract

A method for controlling a buffer in an optical disc driver is provided to obtain required information from the information stored on the buffer by preserving file system information in a region of buffer if the file system needs to be accessed frequently. A method for controlling a buffer in an optical disc driver comprises a first step(S1) of reading out information, which needs to be accessed frequently, from an optical disc and storing in a specific region of a buffer according to the attribute of information; a second step(S2,S3) of storing required data on the buffer from the optical disc to be moved to a position confirmed according to the attribute of information stored on the first step; a third step(S4) of detecting the position of required data by using the information stored in the specific region of the buffer; and a fourth step(S5) of storing data read from the position confirmed in the third step in the buffer.

Description

Control method of buffer in optical disc device

1 is a diagram illustrating an operation of a buffer in a conventional optical disk device.

2 is a control block diagram for controlling the operation of the buffer in the optical disk apparatus according to the present invention,

3 is a flowchart illustrating an operation of controlling an operation of a buffer in the optical disk device according to the present invention.

4 is an exemplary view showing an operating state of a buffer in the optical disk device according to the present invention.

Explanation of symbols on the main parts of the drawings

10: optical disc 11: spindle motor

20: optical pickup 40: channel bit encoder

41: optical drive 50: R / F section

60: drive portion 61: servo portion

70: Micom 71: EEPROM

30a: digital recording signal processor 30b: digital reproduction signal processor

85: buffer

The present invention relates to a buffer control method of an optical disk device, and more particularly, to a buffer control method of an optical disk device capable of efficiently performing a buffer operation when playing a disk.

Recently used DVD is a widely used optical disc. The DVD may record and store high quality video data and high quality audio data for a long time. DVD can record and store multiple titles on one disc, additional data to support display mode, number of audio and audio channels for each title, copyright information on whether a disc is duplicated, double-sided disc or single-sided disc. Disc type information indicating that the disc is recorded and stored together. In addition, various types of information and data for providing new functions and additional information are additionally recorded to have various characteristics for each DVD.

Meanwhile, as the usage range of the DVD is expanded, various information is recorded in the DVD. For example, the DVD contains various data that are used in almost every field of modern society such as film, academic, program, and other data.

As such, the DVD capable of storing various types of data can store data in various ways, but can be divided into two types. The first is to back up the working data on a disc in a personal computer environment, and the second is video and audio recorded on a mastered movie such as a DVD-ROM title, or recorded through various recorders, disc camcorders, etc. It may be used for viewing information.

In both cases, the information recorded on the disc can be classified into two types. One of them is data information, that is, stream data information and user document information including video and audio data in the case of a DVD-ROM title, and the other is a file system capable of identifying at what position the data information is recorded. It is divided into information.

Therefore, the general optical disk device checks the control information for the data information from the file system information, moves from the place where the desired data is located in the data information, reads the data from the DVD, and temporarily stores the read data in the internal buffer. . The data temporarily stored in the buffer is sequentially applied to a reproduction signal processor, and the video signal and audio information are extracted from the reproduction signal processor, and the extracted video information is transmitted to a display device for display. Is output through

On the other hand, a general optical disc apparatus uses an internal buffer to smoothly transfer data read from the disc to a reproduction signal processor. The buffer is used in a ring structure, and when the address for reading data from the disk is changed, the buffer is emptied and newly filled.

1 is an exemplary view showing a mode of operating a buffer in a conventional optical disk device.

As shown in the figure, a physical address exists on the recording surface of the disc (p1 to p20 in the example), and file system information f1 to f5 is recorded up to the physical addresses p1 to p5. The other physical addresses p6 to p20 store video or audio stream information (data information) d1 to d15. The file system information f1 shows control information (location, size, etc.) for the data stored at the physical addresses p6 to p15, and the file system information f2 shows the data stored at the physical addresses p16 to p17. Assume that it represents control information. It is assumed that the following file system information f3, f4, and f5 represent control information for data stored at the physical addresses p18 to p20.

On the other hand, the size of the internal buffer provided in the conventional optical disk device is shown to be composed of b1 ~ b8.

Operation of the buffer in the conventional optical disk device configured as described above was made as follows.

First, when an optical disc is mounted on the optical disc device, file system information is read. The file system information f1 read out at this time is temporarily stored in the buffer. This process is the first process (1) shown in FIG.

Next, when the analysis is performed by reading the file system information f1 stored in the buffer by the control unit inside the optical disk device, the initial position p6 of the physical location indicated in the file system information f1 is found. Data is read from the physical location p6 by a scannable amount and stored in a buffer. The scan amount reads data d1 to d5 from the physical position p6 to the physical position p10 and stores it in the buffer. This process is the second process (2) shown in FIG. When data is stored in the buffer in the second process (2), the previously stored data f1 is deleted and new data is stored from the beginning of the buffer. This is because, when the buffer is configured as a ring structure, the buffer is emptied and newly stored when the physical address for reading data from the disk is changed.

In the second process (2), if necessary signal processing is performed with data (d1 to d5) stored in the buffer to extract video and audio signals, the extracted video signal is displayed through a display device. The extracted audio signal is output through the sound device.

Next, when all the signal processing of the data (d1 ~ d5) stored in the buffer is performed in the second process (2), the control unit inside the optical disk device again checks the file system information ( f1) is read and temporarily stored in the buffer. This process is the third process (3) shown in FIG. When data is stored in the buffer in the third process (3), previously stored data d1 to d5 are deleted, and new data is stored from the beginning of the buffer. This is because, when the buffer is configured as a ring structure, the buffer is emptied and newly stored when the physical address for reading data from the disk is changed.

Through the third process (3), the control unit inside the optical disc apparatus reads and analyzes the file system information f1 stored in the buffer, and confirms the physical position p11 indicated in the file system information f1. The optical pickup is moved to the physical location p11, and data is read from the physical location p11 by a scanable amount and stored in a buffer. In this way, the buffer stores data information d6 to d10 from the physical location p11 to the physical location p15. The process at this time is the fourth process (4) shown in FIG. When data is stored in the buffer in the fourth process (4), the previously stored data f1 is deleted and new data is stored from the beginning of the buffer. This is because, when the buffer is configured as a ring structure, the buffer is emptied and newly stored when the physical address for reading data from the disk is changed.

After all the signal processing of the data information shown in the file system information f1 is performed in this manner, the next file system information f2 is analyzed and the process of reading the data information is repeatedly performed in the same manner as the above process. It is done.

As described above, the buffer control method of the conventional optical disk device in which the data is stored in the buffer includes file system information in order to locate a desired information in the data information.

The process of repeatedly reading (f1) is performed. In particular, since the operation of the buffer has a ring structure, when the physical address of the data to be read is changed,

When the file system information is newly read, a servo search for the read data, a decoding process for obtaining user information from the information recorded on the disk, and the decoded data are stacked in an internal buffer. Buffering is needed. That is, a time delay problem occurs due to the process of repeatedly reading the file system information f1. This operation takes about 200msec and more time if the quality of the disc is not good. Therefore, the buffer control method of the conventional optical disk device has a problem in that a time delay occurs due to the repeated reading of file system information.

Accordingly, an object of the present invention is to provide a buffer control method of an optical disk apparatus, which is designed to solve the above problems and can efficiently operate a buffer for temporarily storing data when reproducing information of an optical disk. .

According to an aspect of the present invention, there is provided a buffer control method of an optical disk apparatus, comprising: a first step of reading information from an optical disk that needs access repeatedly according to an attribute of information and storing the information in an area of a buffer; A second step of moving to a location identified from an attribute of the information stored in the first step, reading desired data from an optical disc, and storing the desired data in a buffer; Searching for a specific area of a buffer and identifying a location of a desired data by using information stored in the specific area of the buffer; And

And a fourth step of reading data from the position identified in the third step and storing the data in a buffer.

The information stored in the specific area of the buffer in the first step of the present invention is characterized in that the file system information.

The third and fourth steps of the present invention are characterized in that the steps are repeated until all desired data are obtained from the information stored in the specific area of the buffer.

The storage of data information in the second and fourth steps of the present invention is characterized in that it is updated whenever the physical address of the information read from the disk is changed.

In the second and fourth steps of the present invention, data is stored in an area excluding a specific area of a buffer.

The specific area of the buffer of the present invention is characterized in that the area is relatively small compared with the area except for the specific area of the buffer.

The amount of data information stored in the second step of the present invention is characterized in that one access amount of the optical pickup.

In the first step of the present invention, the position information confirmed from the information stored in the specific area of the buffer is characterized by identifying the physical address of the optical disk recording surface.

In the first step of the present invention, the attribute information of the information stored in the specific area of the buffer is stored within the limit that the size of the specific area of the buffer is allowed.

Hereinafter, a preferred embodiment of a buffer control method of an optical disk apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

2 shows an overall configuration diagram of an optical disk apparatus according to the present invention.

As shown in the drawing, the optical disk apparatus of the present invention includes a digital recording signal processing unit 30a for adding an error correction code (ECC) or the like to input digital data to convert it into a recording format, and converting the data converted into the recording format. And a channel bit encoder 40 for reconverting to a bit stream, and an optical driver 41 for outputting a light quantity driving signal according to the input signal.

The optical disk apparatus of the present invention further includes an optical pickup 20 for recording a signal on the optical disk 10 in accordance with the light quantity driving signal, and detecting the recording signal from the recording surface of the optical disk, and the optical pickup 20. R / F unit 50 for outputting a binary signal by shaping the signal after filtering, drive unit 60 for driving the optical pickup 50 and spindle motor 11, and tracking error of the optical pickup 20 And a servo unit 61 for controlling the drive of the drive unit 60 from the signal TE and the focusing error signal FE and the rotational speed of the optical disc 10.

The optical disk apparatus of the present invention includes a digital reproduction signal processor (30b) for restoring the binary signal to original data with its own clock synchronized with the binary signal, and for each recording speed for each disk code (disc manufacturer). And a memory 71 in which various control values including reference recording power, reproducing power, erasing power, and the like are stored in the form of firmware, and the microcomputer 70 which controls the system as a whole.

In the optical disk apparatus of the present invention, the buffer 85 temporarily stores data read from the disk 10 through the optical pickup 20 and transmits the data to the digital reproduction signal processor 30b to perform digital signal processing. It is made, including. The buffer 85 is divided into two areas, the first area is used as an area for temporarily storing file system information, and the second area is used as an area for temporarily storing video and audio stream data information.

Preferably, the first area is set smaller than the second area in which data information is stored. The file system information stored in the first area of the buffer 85 is stored in the first area until it is accessed from the stored file system information to access all desired data. Have When accessing data from the other file system information of the buffer 85, the file system information stored in the first area is erased and the new file system information is stored.

In the second area, data which is accessed through the optical pickup 20 is updated based on the capacity of the second area. The data stored in the second area has a ring structure of a buffer, and when the physical address for reading data from the disk is changed, the buffer is emptied and newly stored.

Accordingly, the microcomputer 70 controls data information storage and update in the second area of the buffer 85 based on file system information stored in the first area of the buffer 85, and further controls the first area. Controls the storage or update of file system information to be stored.

In the buffer control method of the optical disk device of the present invention having the above configuration, the buffer storage space is divided into a first area and a second area, and is stored in the second area from file system information stored in the first area. The storage of data information is controlled. In particular, when accessing desired data information based on location information obtained from the same file system information, the file system information is stored and stored in a specific area of a buffer. It is done together.

3 is a flowchart illustrating an operation of efficiently operating a buffer in the optical disk device according to the present invention.

First, the data storage space of the buffer 85 is divided into two. The first area is an area in which file system information is stored, and the second area is in which data information is stored. And as mentioned above, the said 1st area | region is comprised with the area | region relatively small compared with a 2nd area | region. When the storage space of the buffer 85 is divided as described above, the microcomputer 70 checks the start position and the end position of the first region and the second region, and stores the data in the first region and the second region. Control to distinguish stored data. In the example of FIG. 4 shown in FIG. 4, the 1st area | region consists of bf1 thru | or bf3, and the 2nd area | region is divided into bd1 thru bd5.

As shown in the figure, a physical address exists on the recording surface of the disc (p1 to p20 in the example), and file system information f1 to f5 are recorded up to the physical addresses p1 to p5. The other physical addresses p6 to p20 store video or audio stream information (data information) d1 to d15. The file system information f1 shows control information (location, size, etc.) for the data stored at the physical addresses p6 to p15, and the file system information f2 shows the data stored at the physical addresses p16 to p17. Assume that it represents control information. It is assumed that the following file system information f3, f4, and f5 represent control information for data stored at the physical addresses p18 to p20.

When the optical disc 10 is mounted, the microcomputer 70 performs an initialization operation. In the initialization operation, all hardware devices such as an optical pickup and a drive, a spindle motor, and an optical driver are prepared to enable a reproduction operation or a recording operation so that data can be reproduced or recorded from the optical disc 10.

In this initialization operation, the microcomputer 70 checks the file system information from the optical disc 10. The operation moves the optical pickup 20 to the place where the file system information is located under the control of the servo 61, and reads the file system information f1 from the optical disc 10. The file system information f1 thus read is changed into a binary signal through the R / F unit 50 and then stored in the first area of the buffer 85 under the control of the microcomputer 70 (S1). This process is shown in the first process (1) in the exemplary diagram shown in FIG.

Next, from the file system information f1 stored in the first area of the buffer 85, the microcomputer 70 identifies the physical location p6 at which the data information is started. At this time, the file system information f1 stored in the buffer 85 performs necessary signal processing such as the digital reproduction signal processing unit 30b.

The microcomputer 70 provides a control signal for moving the optical pickup 20 to the identified physical position p6 to the servo unit 61, and simultaneously reads data from the optical disc 10. It is to control the driving (S2).

The optical pickup 20 reads data from the controlled position of the optical disc 10, and the data thus read is input to the buffer 85 through the R / F unit 50. The microcomputer 70 controls the data input through the R / F unit 50 to be stored in the second area of the buffer 85. In this case, a change occurs in the amount stored in the buffer 85 according to the access amount of the optical pickup 20, and at this time, the amount of one-time access of the optical pickup 20 is greater than the second storage space of the buffer 85. Of course it should be small. In this embodiment, the one-time access amount of the optical pickup 20 is shown from the physical position p6 to the physical position p10. Therefore, data d1 to data d5 are read and stored in the second area of the buffer 85 (S3). This process is shown in the second process (2) shown in FIG.

The data d1 to d5 stored in the step S3 are sequentially provided to the digital reproduction signal processing unit 30b so that the necessary signal processing for extracting the video signal and the audio signal is performed so that the video signal is displayed through the display unit. The signal is output through the sound system.

Next, the microcomputer 70 reads out the file system information f1 stored in the first area of the buffer 85 without performing the process of reading and importing the file system information stored in the optical disc 10. Check the location information of the data. That is, the microcomputer 70 searches the first areas bf1 to bf3 of the buffer 85 and checks the physical location information p11 in which the next data is stored.

The microcomputer 70 provides a control signal for moving the optical pickup 20 to the identified physical position p11 to the servo unit 61, and simultaneously reads the data from the optical disc 10. Control of the drive (S4). This process is shown in the third process (3) in FIG.

The optical pickup 20 reads data from the controlled position of the optical disc 10, and the data thus read is input to the buffer 85 through the R / F unit 50. The microcomputer 70 controls the data input through the R / F unit 50 to be stored in the second area of the buffer 85. Therefore, data d6 to data d10 are read and stored in the second area of the buffer 85 (S5). This process is shown in the fourth process (4) in FIG.

The data d6 to d10 stored in the step S4 are sequentially provided to the digital reproduction signal processing unit 30b to perform necessary signal processing for extracting the video signal and the audio signal, and the video signal is displayed through the display unit. The signal is output through the sound system.

After all the processes for obtaining the desired data information by checking the physical location from the file system information f1 are performed as described above, the microcomputer 70 returns the optical pickup 20 to the next file system information f2. The process of accessing the file system information f2 is performed by moving to the area where the data is stored.

The process of storing the file system information f2 in a specific area of the buffer 85 and accessing desired data information using the file system information stored in the buffer is the same as the processes described above, or Similarly.

In FIG. 3, only the data information access process based on the file system information f1 is referred to. However, the file system information stored in the predetermined specific area of the buffer 85, that is, the first area, may be described. The information may be frequently accessed (for example, f1), and may store all the file system information within the limit in which the space of the first area of the buffer 85 is allowed. In addition, the information stored in the first area is data indicating an attribute of the information, such as file system information, and any information that needs frequent access is possible. That is, the first area of the buffer may be described as an area for storing frequently available information.

As can be seen through the above process, when the file system information needs to be repeatedly accessed, the present invention does not perform the process of accessing from the optical disk by allocating and preserving the area of the buffer, and confirms the information stored in the buffer without the need to access the file system information. It is controlling to get information. Therefore, the file system information recorded on the disc is not frequently accessed, and the disc reproduction time can be shortened as a whole.

The above-described preferred embodiment of the present invention is disclosed for the purpose of illustration, and may be applied to the case where the storage space of the buffer is divided into two. Therefore, those skilled in the art will be able to improve, change, substitute or add other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims.

In the above-described buffer control method of the optical disk apparatus according to the present invention, when the file system information needs to be accessed repeatedly, the buffer disk control method allocates a buffer area and preserves the corresponding file system information. Instead, control is performed to obtain the necessary information by checking the information stored in the buffer. In other words, the present invention enables the efficient use of file system information by dividing the storage space of the buffer into two. Therefore, the present invention makes it possible to shorten the disc reproduction time as a whole by reducing the number of times of accessing the file system information recorded on the disc.

Claims (9)

A first step of reading the information which needs to be accessed repeatedly according to the property of the information from the optical disc and storing it in a specific area of the buffer; A second step of moving to a location identified from an attribute of the information stored in the first step, reading desired data from an optical disc, and storing the desired data in a buffer; Searching for a specific area of a buffer and identifying a location of a desired data by using information stored in the specific area of the buffer; And And a fourth step of reading data from the position identified in the third step and storing the data in a buffer. The method of claim 1, And wherein the information stored in the specific area of the buffer in the first step is file system information. The method of claim 1, The third and fourth steps are performed repeatedly until the desired data is all obtained from the information stored in the specific area of the buffer. The method of claim 3, wherein The storage of data information in the second and fourth steps is updated whenever the physical address of the information read from the disk is changed. The method of claim 4, wherein And the second and fourth steps store data in an area excluding a specific area of the buffer. The method of claim 5, wherein And a specific area of the buffer is a relatively small area compared with an area except for the specific area of the buffer. The method of claim 1, The amount of data information stored in the second step is a one-time access amount of the optical pickup. The method of claim 1, And the position information to be confirmed from the information stored in the specific area of the buffer in the first step, the physical address of the optical disk recording surface. The method of claim 1, The attribute information of the information stored in the specific area of the buffer in the first step is stored within the limit that the size of the specific area of the buffer is allowed.

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