KR100596867B1 - Method for reproducing data in optical disc device - Google Patents

Abstract

The present invention relates to a data reproducing method in an optical disc apparatus, wherein the command received from the back end is confirmed through an interface while buffering data read and reproduced from the optical disc in a buffer of the front end, When the data transfer request is satisfied, the buffering state in the front end buffer is checked, and the buffered data is read out and transferred to the back end, whereby a large amount of SRAM is separately separated in an optical disk device such as a DVD player. It is a very useful invention that the data reproducing operation can be normally performed continuously using a small internal buffer memory without using, thereby increasing the manufacturing cost of the optical disk device and effectively preventing the device from being enlarged.

DVD Player, Front-End, Back-End, Buffer Memory, DRAM, SRAM, Command

Description

Method of reproducing data in optical disc device             

1 shows a configuration of a general optical disk device,

2 illustrates a configuration of an optical disk device to which the present invention is applied.

3 is a flowchart illustrating an operation of a data reproducing method in the optical disk device according to the present invention;

4 and 5 illustrate a data buffering state in an optical disk device to which the present invention is applied.

※ Explanation of code for main part of drawing

10: optical disc 11: optical pickup

12: RF processing unit 13: digital signal processing unit

14: first buffer 15: MPEG decoder

16: second buffer 17: microcomputer

18: memory 19: servo controller

20: motor driver 21: spindle motor

30: SRAM

The present invention relates to a method of reproducing data in an optical disk device, for example, in various optical disk devices such as a DVD-Player, etc., without using a separate buffer memory such as a large capacity SRAM. The present invention relates to a data reproducing method in an optical disk device for performing a data reproducing operation normally.

In general, optical disc devices, for example, DVD players, which can read and reproduce high quality video data and high quality audio data recorded on an optical disc such as a DVD (Digital Versatile Disc), have been developed and commercialized.

On the other hand, in the optical disc device such as the DVD player, as shown in Fig. 1, the optical pickup 11, the RF processing unit 12, the digital signal processing unit 13, the first buffer 14, the MPEG decoder 15 , A second buffer 16, a microcomputer 17, a memory 18, a servo controller 19, a motor driver 20, a spindle motor 21, and an SRAM 30 may be included. Can be.

In addition, the first buffer 14 and the second buffer 16, for example, DRAM (DRAM) can be used as a small capacity memory having a recording capacity of 192KBytes, the memory 18 is a non-volatile memory EEPROM may be used, and the SRAM 30 may use a large memory having a recording capacity of 2 MBytes.

The microcomputer 13 reads the navigation information recorded in the lead-in area of the optical disk when the optical disk 10 such as the DVD is inserted into the device and reads the navigation information. After storing in the mobile terminal, the navigation operation is controlled by reading and referring to the navigation information according to a user's request.

In the meantime, the digital signal processor 13 digitally processes the data stream read out from the optical disc 10, buffers the SRAM 30, and transmits the data stream to the MPEG decoder 15. In the MPEG decoder 15, the data stream transmitted and received from the digital signal processing unit 13 is buffered in the second buffer 16, and then read in a predetermined recording size to be decoded into original audio and video data. do.

For example, the digital signal processor 13 digitally processes the data stream read from the optical disc 10, buffers the data in the SRAM 30, and then buffers the buffer in the second buffer 16. In order to prevent under-run, data of 32 KBytes corresponding to a predetermined recording size, for example, an error correction block unit, is read and transmitted to the MPEG decoder 15.

In the MPEG decoder 15, 32 KBytes of data transmitted and received as described above is buffered in the second buffer 16, and then the data is read and decoded in units of an error correction block (ECC lock). .

Accordingly, in the MPEG decoder 15, decoding processing can be continuously performed without a buffer under-run, and a large amount of data can be sufficiently buffered in SRAM, which is a large memory. 1 Since buffer overflow or buffer underrun that occurs when using the buffer 14 can be prevented in advance. The data reproducing operation can be normally performed continuously.

However, in the case of using a large-size SRAM as a buffer memory in an optical disk device such as a DVD player as described above, since the SRAM is a high price memory, the manufacturing cost of the optical disk device is greatly increased. Further, the problem of causing an increase in size of the device is caused by the additional provision of the SRAM.

Therefore, the present invention was created to solve the above problems, and in an optical disc device such as a DVD player, data reproduction is performed using a small internal buffer memory without using a large amount of SRAM. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of reproducing data in an optical disk device for allowing an operation to be normally performed continuously.

A data reproducing method in an optical disc apparatus according to the present invention for achieving the above object, 1 to confirm the command received from the back end via the interface, while buffering the data read and reproduced from the optical disc in the buffer of the front end step; Checking the buffering state in a buffer of the front end when the confirmed command corresponds to a data transfer request; And reading the data buffered in the buffer of the front end according to the check result and transmitting the read data to the back end.

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

First, the data reproduction method according to the present invention can be applied to an optical disc device such as a DVD player. For example, in the DVD player to which the present invention is applied, as shown in FIG. Processor 12, digital signal processor 13, first buffer 14, MPEG decoder 15, second buffer 16, microcomputer 17, memory 18, servo controller 19, motor driver 20, and the spindle motor 21 and the like are included.

Meanwhile, as described above with reference to FIG. 1, the DVD player does not separately use SRAM, which is a high-capacity large-capacity memory, and the first buffer 14 and the second buffer 16 are examples. For example, DRAM may be used as a small capacity memory having a recording capacity of 192 KBytes, and EEPROM may be used as the nonvolatile memory.

In addition, the digital signal processing unit 13 and the MPEG decoder 15 are connected and connected through an interface. For example, as shown in FIG. 2, a well-known well known AT Attachment Packet Interface (ATAPI) is shown. The front-end divided by the reference) includes a first buffer and a digital signal processing unit, and the back-end includes a second buffer and an MPEG decoder. The data reproduction operation of the DVD player divided into the end and the back end will be described in detail as follows.

3 is a flowchart illustrating an operation of a data reproducing method in the optical disc device according to the present invention. In the microcomputer 17, when a data reproducing operation is performed at the user's request (S10), The digital signal processor and the MPEG decoder 15 are operated to control the digital signal processor 13. The digital signal processor 13 of the front end performs digital signal processing on the data stream read from the optical disc 10, and the first buffer 14. In this case, the command transmitted from the MPEG decoder 15 of the back end is transmitted through an interface while buffering the buffer to a range where no overflow occurs in the first buffer 14. Will receive.

On the other hand, if the received command corresponds to a data transfer request (S12), the buffering state in the first buffer is checked (S13), and data larger than a write size corresponding to an error correction block (ECC Block) unit is buffered. In the case where the data is buffered, for example, as shown in FIG. 4, when 32 KBytes data or more is buffered, data in 32 KBytes units is read and transmitted to the MPEG decoder 15 of the back end (S15).

On the other hand, if more than 32KBytes data is not buffered in the first buffer, a command for requesting a temporary wait is generated and transmitted to the MPEG decoder of the back end (S16).

The MPEG decoder 15 of the back end reads the buffered data while buffering the data in the second buffer when the data of the error correction block unit is received from the digital signal processing unit, thereby reading the original video and Decode to audio data.

On the other hand, when the digital signal processing unit 14 reads and transmits data as described above, and a free area exists in the first buffer, the digital signal processor 14 performs digital signal processing on the data read from the optical disc to free the first buffer. A series of operations buffering the region is repeatedly performed (S17).

Accordingly, as shown in FIG. 5, new 32 KByte data is buffered in the first buffer, and this series of operations is continuously performed until the reproduction operation is stopped (S18). It is possible to prevent the occurrence of buffer underruns and overflows in the first buffer 14 and to prevent the occurrence of buffer underruns in the second buffer 16, thereby ensuring normal data reproduction. It can be performed continuously.

For reference, the present invention can be applied not only to a DVD player but also to various other optical disk devices. The first buffer and the second buffer are small buffer memories, and other buffer memories other than the DRAM are included. Can be used instead.

Or more, preferred embodiments of the present invention described above, for the purpose of illustration, those skilled in the art, within the technical spirit and the technical scope of the present invention disclosed in the appended claims below, to further improve various other embodiments Changes, substitutions or additions will be possible.

The data reproducing method of the optical disc device according to the present invention constructed and constructed as described above, while buffering data read and reproduced from the optical disc in the buffer of the front end, confirms a command received from the back end through the interface, When the checked command corresponds to a data transfer request, the buffering state in the front end buffer is checked, and the buffered data is read out and transmitted to the back end, whereby a large amount of SRAM (such as a DVD player) is used. Without using SRAM, a small internal buffer memory can be used to continuously perform data reproducing operations normally, thereby increasing the manufacturing cost of the optical disk device and effectively preventing the device from being enlarged. It is a useful invention.

Claims (7)

Confirming a command received from the back end through the interface, while buffering data read and reproduced from the optical disc in a buffer of the front end; Checking the buffering state in a buffer of the front end when the confirmed command corresponds to a data transfer request; And And reading the data buffered in the buffer of the front end and transmitting the buffered data to the back end according to the check result. The method of claim 1, In the first step, an optical disc checks a command received from the back end through an interface while buffering data read and reproduced from the optical disc to a range where no overflow occurs in the front end buffer. How to play data on the device. The method of claim 1, The buffer of the front end is a small DRAM, in which data having a recording size corresponding to an error correction block unit is stored and read. The method of claim 1, In the third step, when the data larger than the recording size corresponding to the error correction block unit is buffered in the buffer of the front end, the buffered data is read and transmitted to the back end. How to play. The method of claim 1, Transmitting a command for requesting a temporary wait to the back end through an interface when data of more than a write size corresponding to an error correction block unit is buffered in the buffer of the front end as a result of the check. A data reproducing method in an optical disc device, characterized in that the configuration. The method of claim 1, The front end includes a digital signal processing unit and a small amount of DRAM, and the back end includes an MPEG decoder and a small amount of DRAM. delete

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